Conversion ratio for engine load% > MAF/HP?

[Brav]

I know we use a factor of .8 for HP to MAF.. and since combined MAF logs top out at 364 when combined, I track the torque to see how the power continues. I ran a few logs tonight to see how everything was running since I put my car back together.. thing is definitely faster! At the dead end street by my office I run at late at night, I actually got air and traction control went nuts over a slight rise. She was pulling hard. But sometimes power didnt come on quite as smooth. And actual boost seemed to sometimes trail behind requested, but not always. Could my 710s e leaking? I hit almost 190% - seems pretty high. 3rd gear pulls are crazy.

The below log- i see timing drop off around 4700 RPM then come back. This is also about where peak engine load comes in, and my peak boost. boost trails off after that a bit. normal?

I forgot - I got 2 error codes for MAFs now - upper limit exceeded. Will this hinder performance?

[Brav]

<table border="0" cellpadding="0" cellspacing="0" width="960"><colgroup><col style="width:48pt" span="15" width="64"> </colgroup><tbody><tr style="height:15.0pt" height="20"> <td style="height:15.0pt;width:48pt" height="20" width="64">
</td> <td style="width:48pt" width="64">Engine Speed</td> <td style="width:48pt" width="64">Mass Air Flow</td> <td style="width:48pt" width="64">Throttle Valve Angle</td> <td style="width:48pt" width="64">Ignition</td> <td style="width:48pt" width="64">
</td> <td style="width:48pt" width="64">Lambda Control</td> <td style="width:48pt" width="64">Lambda Control</td> <td style="width:48pt" width="64">Lambda Control</td> <td colspan="2" style="mso-ignore:colspan;width:96pt" width="128">Lambda Control</td> <td style="width:48pt" width="64">Engine Speed</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Boost Pressure</td> <td style="width:48pt" width="64">Boost Pressure</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">TIME</td> <td>(G28)</td> <td colspan="2" style="mso-ignore:colspan">(G70 + G246)</td> <td>Timing Angle</td> <td>TIME</td> <td>Bank 1 (actual)</td> <td>Bank 1 (specified)</td> <td>Bank 2 (actual)</td> <td>Bank 2 (specified)</td> <td>TIME</td> <td>(G28)</td> <td>
</td> <td>(specified)</td> <td>(actual)</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">STAMP</td> <td> /min</td> <td> g/s</td> <td> %</td> <td> °BTDC</td> <td>STAMP</td> <td> V</td> <td> V</td> <td> V</td> <td> V</td> <td>STAMP</td> <td> /min</td> <td> %</td> <td> mbar</td> <td> mbar</td> </tr> <tr style="mso-height-source:userset;height:37.5pt" height="50"> <td style="height:37.5pt" height="50" align="right">107.06</td> <td align="right">3320</td> <td align="right">31.22</td> <td align="right">9.4</td> <td align="right">48</td> <td align="right">107.23</td> <td align="right">0.255</td> <td align="right">0.1</td> <td align="right">0.665</td> <td align="right">0.095</td> <td align="right">107.4</td> <td align="right">3320</td> <td align="right">21.8</td> <td align="right">1000</td> <td align="right">1040</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">107.58</td> <td align="right">3320</td> <td align="right">35.14</td> <td align="right">10.6</td> <td align="right">46.5</td> <td align="right">107.75</td> <td align="right">0.09</td> <td align="right">0.095</td> <td align="right">0.08</td> <td align="right">0.15</td> <td align="right">107.92</td> <td align="right">3360</td> <td align="right">72.9</td> <td align="right">1980</td> <td align="right">1010</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">108.09</td> <td align="right">3400</td> <td align="right">165.11</td> <td align="right">94.5</td> <td align="right">21.8</td> <td align="right">108.26</td> <td align="right">0.24</td> <td align="right">0.26</td> <td align="right">0.695</td> <td align="right">0.675</td> <td align="right">108.43</td> <td align="right">3560</td> <td align="right">130.8</td> <td align="right">2180</td> <td align="right">1610</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">108.61</td> <td align="right">3640</td> <td align="right">310.44</td> <td align="right">98</td> <td align="right">3.8</td> <td align="right">108.78</td> <td align="right">0.775</td> <td align="right">0.8</td> <td align="right">0.8</td> <td align="right">0.79</td> <td align="right">108.95</td> <td align="right">3800</td> <td align="right">178.9</td> <td align="right">2170</td> <td align="right">2150</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">109.12</td> <td align="right">3920</td> <td align="right">311.67</td> <td align="right">100</td> <td align="right">1.5</td> <td align="right">109.29</td> <td align="right">0.815</td> <td align="right">0.835</td> <td align="right">0.83</td> <td align="right">0.825</td> <td align="right">109.46</td> <td align="right">4120</td> <td align="right">177.4</td> <td align="right">2150</td> <td align="right">2090</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">109.64</td> <td align="right">4200</td> <td align="right">342.92</td> <td align="right">100</td> <td align="right">5.3</td> <td align="right">109.81</td> <td align="right">0.815</td> <td align="right">0.83</td> <td align="right">0.825</td> <td align="right">0.82</td> <td align="right">109.98</td> <td align="right">4400</td> <td class="xl63" align="right">185</td> <td align="right">2150</td> <td align="right">2160</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">110.15</td> <td align="right">4480</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">1.5</td> <td align="right">110.33</td> <td align="right">0.815</td> <td align="right">0.83</td> <td align="right">0.83</td> <td align="right">0.82</td> <td align="right">110.5</td> <td align="right">4640</td> <td class="xl63" align="right">188</td> <td align="right">2150</td> <td align="right">2130</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">110.67</td> <td align="right">4760</td> <td align="right">364.08</td> <td align="right">100</td> <td class="xl63" align="right">-3</td> <td align="right">110.83</td> <td align="right">0.82</td> <td align="right">0.84</td> <td align="right">0.84</td> <td align="right">0.83</td> <td align="right">111.01</td> <td align="right">4920</td> <td class="xl63" align="right">185</td> <td align="right">2080</td> <td align="right">2100</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">111.18</td> <td align="right">5040</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">2.3</td> <td align="right">111.35</td> <td align="right">0.83</td> <td align="right">0.845</td> <td align="right">0.845</td> <td align="right">0.835</td> <td align="right">111.53</td> <td align="right">5200</td> <td align="right">179.7</td> <td align="right">2050</td> <td align="right">2050</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">111.7</td> <td align="right">5240</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">1.5</td> <td align="right">111.86</td> <td align="right">0.82</td> <td align="right">0.84</td> <td align="right">0.835</td> <td align="right">0.835</td> <td align="right">112.04</td> <td align="right">5400</td> <td align="right">173.7</td> <td align="right">2040</td> <td align="right">1970</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">112.21</td> <td align="right">5480</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">4.5</td> <td align="right">112.39</td> <td align="right">0.83</td> <td align="right">0.85</td> <td align="right">0.855</td> <td align="right">0.85</td> <td align="right">112.57</td> <td align="right">5640</td> <td align="right">172.2</td> <td align="right">2060</td> <td align="right">1930</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">112.75</td> <td align="right">5720</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">6</td> <td align="right">112.93</td> <td align="right">0.825</td> <td align="right">0.85</td> <td align="right">0.85</td> <td align="right">0.85</td> <td align="right">113.1</td> <td align="right">5880</td> <td align="right">165.4</td> <td align="right">2100</td> <td align="right">1870</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">113.27</td> <td align="right">5920</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">8.3</td> <td align="right">113.44</td> <td align="right">0.83</td> <td align="right">0.85</td> <td align="right">0.86</td> <td align="right">0.86</td> <td align="right">113.62</td> <td align="right">6080</td> <td align="right">161.7</td> <td align="right">2130</td> <td align="right">1860</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">113.79</td> <td align="right">6120</td> <td align="right">364.08</td> <td align="right">99.6</td> <td align="right">12.8</td> <td align="right">113.97</td> <td align="right">0.83</td> <td align="right">0.855</td> <td align="right">0.86</td> <td align="right">0.86</td> <td align="right">114.14</td> <td align="right">6280</td> <td align="right">157.1</td> <td align="right">2140</td> <td align="right">1830</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">114.32</td> <td align="right">6320</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">12.8</td> <td align="right">114.49</td> <td align="right">0.83</td> <td align="right">0.86</td> <td align="right">0.86</td> <td align="right">0.86</td> <td align="right">114.66</td> <td align="right">6440</td> <td align="right">155.6</td> <td align="right">2170</td> <td align="right">1840</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">114.83</td> <td align="right">6480</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">11.3</td> <td align="right">115</td> <td align="right">0.835</td> <td align="right">0.86</td> <td align="right">0.855</td> <td align="right">0.855</td> <td align="right">115.18</td> <td align="right">5760</td> <td align="right">170.7</td> <td align="right">2110</td> <td align="right">1880</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">115.36</td> <td align="right">4880</td> <td align="right">364.08</td> <td align="right">97.6</td> <td align="right">-7.5</td> <td align="right">115.54</td> <td align="right">0.825</td> <td align="right">0.855</td> <td align="right">0.85</td> <td align="right">0.85</td> <td align="right">115.71</td> <td align="right">4560</td> <td align="right">182</td> <td align="right">2170</td> <td align="right">1970</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">115.88</td> <td align="right">4600</td> <td align="right">333.69</td> <td align="right">100</td> <td align="right">4.5</td> <td align="right">116.05</td> <td align="right">0.83</td> <td align="right">0.855</td> <td align="right">0.855</td> <td align="right">0.855</td> <td align="right">116.23</td> <td align="right">4720</td> <td class="xl63" align="right">189.5</td> <td align="right">2120</td> <td align="right">2160</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">116.39</td> <td align="right">4720</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">0</td> <td align="right">116.56</td> <td align="right">0.825</td> <td align="right">0.85</td> <td align="right">0.845</td> <td align="right">0.85</td> <td align="right">116.74</td> <td align="right">4800</td> <td align="right">191.7</td> <td align="right">2090</td> <td align="right">2190</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">116.9</td> <td align="right">4800</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">0.8</td> <td align="right">117.08</td> <td align="right">0.83</td> <td align="right">0.855</td> <td align="right">0.855</td> <td align="right">0.855</td> <td align="right">117.26</td> <td align="right">4880</td> <td align="right">191.7</td> <td align="right">2070</td> <td align="right">2170</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">117.43</td> <td align="right">4880</td> <td align="right">364.08</td> <td align="right">100</td> <td align="right">2.3</td> <td align="right">117.61</td> <td align="right">0.815</td> <td align="right">0.85</td> <td align="right">0.845</td> <td align="right">0.85</td> <td align="right">117.78</td> <td align="right">4720</td> <td align="right">35.3</td> <td align="right">1000</td> <td align="right">2030</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">117.95</td> <td align="right">4760</td> <td align="right">9.72</td> <td align="right">5.9</td> <td align="right">52.5</td> <td align="right">118.13</td> <td align="right">0.775</td> <td align="right">0.83</td> <td align="right">0.815</td> <td align="right">0.82</td> <td align="right">118.31</td> <td align="right">4760</td> <td align="right">13.5</td> <td align="right">1000</td> <td align="right">1190</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">118.48</td> <td align="right">4760</td> <td align="right">26.42</td> <td align="right">8.2</td> <td align="right">6</td> <td align="right">118.66</td> <td align="right">0.485</td> <td align="right">0.785</td> <td align="right">0.635</td> <td align="right">0.8</td> <td align="right">118.84</td> <td align="right">4680</td> <td align="right">12</td> <td align="right">1000</td> <td align="right">1100</td> </tr> </tbody></table>

[4everRS]

Log looks pretty good Brav. Diverters could be causing the trail in boost you see. As far as MAF logs, I think it's block 2 that will show the values of both Mafs independently. Then you can add them together and know what the true MAF reading is.

[4everRS]

And you should post that log for us to see!

[ttboost]

In troubleshooting my problems lately, I have been logging block 2 (separtates the MAF's, so you can what EACH one is doing) and blocks114 & 115 for boost and block 120 for actual engine TQ. I believe block 120 is teribbly inaccurate for a flashed car, but you can at least see the consisitancy....
On kill, I am seeing MAF's in the low 430's, but not always at peak boost.

My actual boost lags way behind my requested boost also....and I noticed my N75 consistantly maxxes out at 95.3%. It was brand new last year, wondering if its expiring already?

[Brav]

looks like boost holds well up to 5400 RPM then it trails off. Sign of leaking DVs? What engine torque / load % are you guys hitting? I will try to log my N75 on the way to work..

[Brav]

02, 114 and 115

<table width="960" border="0" cellpadding="0" cellspacing="0"><colgroup><col style="width:48pt" span="15" width="64"> </colgroup><tbody><tr style="height:15.0pt" height="20"> <td style="height:15.0pt;width:48pt" width="64" height="20"> </td> <td style="width:48pt" width="64">Engine Speed</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Mass Air Flow</td> <td colspan="2" style="mso-ignore:colspan;width:96pt" width="128">Mass Air Flow</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Engine Load</td> <td colspan="2" style="mso-ignore:colspan;width:96pt" width="128">Wastegate (N75)</td> <td style="width:48pt" width="64">Engine Speed</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Boost Pressure</td> <td style="width:48pt" width="64">Boost Pressure</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">TIME</td> <td>(G28)</td> <td>
</td> <td>(G70) Bank 1</td> <td>(G246) Bank 2</td> <td>TIME</td> <td>(specified)</td> <td>(spec. corrected)</td> <td>(actual)</td> <td>Duty Cycle</td> <td>TIME</td> <td>(G28)</td> <td>
</td> <td>(specified)</td> <td>(actual)</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">STAMP</td> <td> /min</td> <td> %</td> <td> g/s</td> <td> g/s</td> <td>STAMP</td> <td> %</td> <td> %</td> <td> %</td> <td> %</td> <td>STAMP</td> <td> /min</td> <td> %</td> <td> mbar</td> <td> mbar</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">0.17</td> <td align="right">2760</td> <td align="right">27.1</td> <td align="right">16.42</td> <td align="right">16.03</td> <td align="right">0.34</td> <td align="right">172.2</td> <td align="right">170.1</td> <td align="right">27.1</td> <td align="right">0</td> <td align="right">0.01</td> <td align="right">2760</td> <td align="right">27.1</td> <td align="right">1010</td> <td align="right">1060</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">0.68</td> <td align="right">2760</td> <td align="right">31.6</td> <td align="right">23.58</td> <td align="right">22.81</td> <td align="right">0.85</td> <td align="right">172.2</td> <td align="right">170.1</td> <td align="right">35.3</td> <td align="right">0</td> <td align="right">0.51</td> <td align="right">2760</td> <td align="right">27.1</td> <td align="right">1010</td> <td align="right">1050</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">1.2</td> <td align="right">2760</td> <td align="right">69.9</td> <td align="right">57.28</td> <td align="right">52.78</td> <td align="right">1.37</td> <td align="right">172.2</td> <td align="right">170.1</td> <td align="right">82</td> <td align="right">99.2</td> <td align="right">1.03</td> <td align="right">2760</td> <td align="right">38.3</td> <td align="right">1150</td> <td align="right">1050</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">1.71</td> <td align="right">2840</td> <td align="right">99.2</td> <td align="right">79.22</td> <td align="right">69.33</td> <td align="right">1.88</td> <td align="right">172.9</td> <td align="right">171.6</td> <td align="right">109.8</td> <td align="right">99.2</td> <td align="right">1.54</td> <td align="right">2840</td> <td align="right">91</td> <td align="right">2250</td> <td align="right">1230</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">2.23</td> <td align="right">2960</td> <td align="right">130.1</td> <td align="right">106.92</td> <td align="right">91.36</td> <td align="right">2.4</td> <td align="right">173.7</td> <td align="right">171.6</td> <td align="right">141.4</td> <td align="right">84.3</td> <td align="right">2.05</td> <td align="right">2920</td> <td align="right">119.5</td> <td align="right">2250</td> <td align="right">1620</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">2.74</td> <td align="right">3040</td> <td align="right">154.1</td> <td align="right">104.94</td> <td align="right">105.81</td> <td align="right">2.91</td> <td align="right">174.4</td> <td align="right">173.1</td> <td align="right">151.1</td> <td align="right">78.8</td> <td align="right">2.57</td> <td align="right">3040</td> <td align="right">151.9</td> <td align="right">2270</td> <td align="right">2050</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">3.27</td> <td align="right">3200</td> <td align="right">147.4</td> <td align="right">101.89</td> <td align="right">113.58</td> <td align="right">3.44</td> <td align="right">175.2</td> <td align="right">173.1</td> <td align="right">148.9</td> <td align="right">79.6</td> <td align="right">3.09</td> <td align="right">3120</td> <td align="right">148.1</td> <td align="right">2280</td> <td align="right">1960</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">3.79</td> <td align="right">3280</td> <td align="right">148.9</td> <td align="right">113.47</td> <td align="right">117.17</td> <td align="right">3.97</td> <td align="right">175.9</td> <td align="right">174.6</td> <td align="right">150.4</td> <td align="right">80.4</td> <td align="right">3.61</td> <td align="right">3240</td> <td align="right">148.9</td> <td align="right">2300</td> <td align="right">1940</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">4.32</td> <td align="right">3440</td> <td align="right">156.4</td> <td align="right">115.14</td> <td align="right">132.19</td> <td align="right">4.49</td> <td align="right">175.9</td> <td align="right">174.6</td> <td align="right">158.6</td> <td align="right">81.2</td> <td align="right">4.14</td> <td align="right">3360</td> <td align="right">154.1</td> <td align="right">2310</td> <td align="right">1980</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">4.84</td> <td align="right">3560</td> <td align="right">166.2</td> <td align="right">131.75</td> <td align="right">146.86</td> <td align="right">5.02</td> <td align="right">176.7</td> <td align="right">174.6</td> <td align="right">167.7</td> <td align="right">82.4</td> <td align="right">4.66</td> <td align="right">3520</td> <td align="right">162.4</td> <td align="right">2320</td> <td align="right">2070</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">5.36</td> <td align="right">3680</td> <td align="right">170.7</td> <td align="right">131.58</td> <td align="right">156.86</td> <td align="right">5.53</td> <td align="right">177.4</td> <td align="right">174.6</td> <td align="right">173.7</td> <td align="right">85.5</td> <td align="right">5.19</td> <td align="right">3640</td> <td align="right">167.7</td> <td align="right">2340</td> <td align="right">2140</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">5.88</td> <td align="right">3800</td> <td align="right">182.7</td> <td align="right">159.39</td> <td align="right">173.14</td> <td align="right">6.05</td> <td align="right">177.4</td> <td align="right">176.1</td> <td align="right">187.2</td> <td align="right">88.6</td> <td align="right">5.71</td> <td align="right">3760</td> <td align="right">178.2</td> <td align="right">2340</td> <td align="right">2240</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">6.39</td> <td align="right">3960</td> <td align="right">191.7</td> <td align="right">168.47</td> <td align="right">190.67</td> <td align="right">6.56</td> <td align="right">178.2</td> <td align="right">176.1</td> <td align="right">191.7</td> <td align="right">85.1</td> <td align="right">6.22</td> <td align="right">3880</td> <td align="right">191.7</td> <td align="right">2360</td> <td align="right">2390</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">6.91</td> <td align="right">4080</td> <td align="right">190.2</td> <td align="right">162.5</td> <td align="right">183.08</td> <td align="right">7.08</td> <td align="right">178.2</td> <td align="right">176.1</td> <td align="right">188.7</td> <td align="right">83.9</td> <td align="right">6.74</td> <td align="right">4040</td> <td align="right">191.7</td> <td align="right">2350</td> <td align="right">2400</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">7.42</td> <td align="right">4200</td> <td align="right">185.7</td> <td align="right">166.89</td> <td align="right">186.17</td> <td align="right">7.59</td> <td align="right">178.9</td> <td align="right">176.1</td> <td align="right">187.2</td> <td align="right">85.1</td> <td align="right">7.25</td> <td align="right">4160</td> <td align="right">186.5</td> <td align="right">2310</td> <td align="right">2270</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">7.93</td> <td align="right">4320</td> <td align="right">189.5</td> <td align="right">175.36</td> <td align="right">192.42</td> <td align="right">8.11</td> <td align="right">178.9</td> <td align="right">177.6</td> <td align="right">186.5</td> <td align="right">81.6</td> <td align="right">7.77</td> <td align="right">4280</td> <td align="right">188</td> <td align="right">2270</td> <td align="right">2270</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">8.46</td> <td align="right">4400</td> <td align="right">182.7</td> <td align="right">149.89</td> <td align="right">166.89</td> <td align="right">8.62</td> <td align="right">178.9</td> <td align="right">177.6</td> <td align="right">69.9</td> <td align="right">0</td> <td align="right">8.28</td> <td align="right">4400</td> <td align="right">184.2</td> <td align="right">2220</td> <td align="right">2200</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">8.97</td> <td align="right">4280</td> <td align="right">12.8</td> <td align="right">11.28</td> <td align="right">5.53</td> <td align="right">9.13</td> <td align="right">178.9</td> <td align="right">177.6</td> <td align="right">13.5</td> <td align="right">0</td> <td align="right">8.79</td> <td align="right">4360</td> <td align="right">17.3</td> <td align="right">1010</td> <td align="right">1540</td> </tr> </tbody></table>

[Brav]

<table width="960" border="0" cellpadding="0" cellspacing="0"><colgroup><col style="width:48pt" span="15" width="64"> </colgroup><tbody><tr style="height:15.0pt" height="20"> <td style="height:15.0pt;width:48pt" width="64" height="20"> </td> <td style="width:48pt" width="64">Engine Speed</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Mass Air Flow</td> <td colspan="2" style="mso-ignore:colspan;width:96pt" width="128">Mass Air Flow</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Engine Load</td> <td colspan="2" style="mso-ignore:colspan;width:96pt" width="128">Wastegate (N75)</td> <td style="width:48pt" width="64">Engine Speed</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Boost Pressure</td> <td style="width:48pt" width="64">Boost Pressure</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">TIME</td> <td>(G28)</td> <td>
</td> <td>(G70) Bank 1</td> <td>(G246) Bank 2</td> <td>TIME</td> <td>(specified)</td> <td>(spec. corrected)</td> <td>(actual)</td> <td>Duty Cycle</td> <td>TIME</td> <td>(G28)</td> <td>
</td> <td>(specified)</td> <td>(actual)</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">STAMP</td> <td> /min</td> <td> %</td> <td> g/s</td> <td> g/s</td> <td>STAMP</td> <td> %</td> <td> %</td> <td> %</td> <td> %</td> <td>STAMP</td> <td> /min</td> <td> %</td> <td> mbar</td> <td> mbar</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">80.65</td> <td align="right">3600</td> <td align="right">72.9</td> <td align="right">75.92</td> <td align="right">71.64</td> <td align="right">80.81</td> <td align="right">176.7</td> <td align="right">174.6</td> <td align="right">91.7</td> <td align="right">99.2</td> <td align="right">81</td> <td align="right">3720</td> <td align="right">112.8</td> <td align="right">2380</td> <td align="right">1490</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">81.17</td> <td align="right">3800</td> <td align="right">140.6</td> <td align="right">147.17</td> <td align="right">142.31</td> <td align="right">81.34</td> <td align="right">178.2</td> <td align="right">176.1</td> <td align="right">164.7</td> <td align="right">85.5</td> <td align="right">81.51</td> <td align="right">4000</td> <td align="right">183.5</td> <td align="right">2410</td> <td align="right">2340</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">81.68</td> <td align="right">4080</td> <td align="right">191.7</td> <td align="right">177.69</td> <td align="right">190.86</td> <td align="right">81.85</td> <td align="right">178.9</td> <td align="right">177.6</td> <td align="right">191.7</td> <td align="right">90.6</td> <td align="right">82.02</td> <td align="right">4280</td> <td align="right">191.7</td> <td align="right">2290</td> <td align="right">2390</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">82.19</td> <td align="right">4400</td> <td align="right">191.7</td> <td align="right">191.31</td> <td align="right">203.06</td> <td align="right">82.37</td> <td align="right">178.9</td> <td align="right">177.6</td> <td align="right">191.7</td> <td align="right">82.4</td> <td align="right">82.54</td> <td align="right">4560</td> <td align="right">191.7</td> <td align="right">2180</td> <td align="right">2240</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">82.71</td> <td align="right">4680</td> <td align="right">191.7</td> <td align="right">195.44</td> <td align="right">200.28</td> <td align="right">82.88</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">185.7</td> <td align="right">79.6</td> <td align="right">83.05</td> <td align="right">4840</td> <td align="right">181.2</td> <td align="right">2090</td> <td align="right">2030</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">83.23</td> <td align="right">4920</td> <td align="right">175.9</td> <td align="right">191</td> <td align="right">196.5</td> <td align="right">83.39</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">172.9</td> <td align="right">87.5</td> <td align="right">83.56</td> <td align="right">5080</td> <td align="right">173.7</td> <td align="right">2030</td> <td align="right">1950</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">83.73</td> <td align="right">5200</td> <td align="right">176.7</td> <td align="right">203.03</td> <td align="right">206.75</td> <td align="right">83.9</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">175.9</td> <td align="right">91.8</td> <td align="right">84.08</td> <td align="right">5360</td> <td align="right">175.2</td> <td align="right">2020</td> <td align="right">1980</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">84.25</td> <td align="right">5440</td> <td align="right">174.4</td> <td align="right">210.11</td> <td align="right">216.08</td> <td align="right">84.43</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">172.2</td> <td align="right">97.6</td> <td align="right">84.59</td> <td align="right">5560</td> <td align="right">172.9</td> <td align="right">2030</td> <td align="right">1940</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">84.77</td> <td align="right">5640</td> <td align="right">171.4</td> <td align="right">206.08</td> <td align="right">213.67</td> <td align="right">84.95</td> <td align="right">178.9</td> <td align="right">177.6</td> <td align="right">169.9</td> <td align="right">96.5</td> <td align="right">85.12</td> <td align="right">5800</td> <td align="right">168.4</td> <td align="right">2070</td> <td align="right">1900</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">85.29</td> <td align="right">5880</td> <td align="right">166.9</td> <td align="right">206.5</td> <td align="right">218.67</td> <td align="right">85.46</td> <td align="right">177.4</td> <td align="right">176.1</td> <td align="right">166.2</td> <td align="right">95.7</td> <td align="right">85.64</td> <td align="right">6000</td> <td align="right">164.7</td> <td align="right">2110</td> <td align="right">1860</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">85.81</td> <td align="right">6040</td> <td align="right">164.7</td> <td align="right">208.42</td> <td align="right">216.97</td> <td align="right">85.99</td> <td align="right">176.7</td> <td align="right">174.6</td> <td align="right">163.2</td> <td align="right">95.3</td> <td align="right">86.16</td> <td align="right">6160</td> <td align="right">162.4</td> <td align="right">2140</td> <td align="right">1860</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">86.34</td> <td align="right">6240</td> <td align="right">160.2</td> <td align="right">208.92</td> <td align="right">211.81</td> <td align="right">86.51</td> <td align="right">175.2</td> <td align="right">173.1</td> <td align="right">158.6</td> <td align="right">95.3</td> <td align="right">86.68</td> <td align="right">6360</td> <td align="right">157.1</td> <td align="right">2160</td> <td align="right">1830</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">86.86</td> <td align="right">6400</td> <td align="right">157.1</td> <td align="right">209.14</td> <td align="right">215.22</td> <td align="right">87.03</td> <td align="right">174.4</td> <td align="right">173.1</td> <td align="right">157.9</td> <td align="right">95.3</td> <td align="right">87.21</td> <td align="right">6480</td> <td align="right">160.2</td> <td align="right">2170</td> <td align="right">1890</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">87.39</td> <td align="right">5880</td> <td align="right">169.2</td> <td align="right">206.69</td> <td align="right">218.89</td> <td align="right">87.56</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">177.4</td> <td align="right">56.9</td> <td align="right">87.73</td> <td align="right">4600</td> <td align="right">182.7</td> <td align="right">2160</td> <td align="right">2150</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">87.91</td> <td align="right">4560</td> <td align="right">179.7</td> <td align="right">150.25</td> <td align="right">166.69</td> <td align="right">88.09</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">164.7</td> <td align="right">91.8</td> <td align="right">88.26</td> <td align="right">4640</td> <td align="right">169.9</td> <td align="right">2140</td> <td align="right">1960</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">88.44</td> <td align="right">4680</td> <td align="right">178.9</td> <td align="right">175.36</td> <td align="right">190.67</td> <td align="right">88.61</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">183.5</td> <td align="right">84.3</td> <td align="right">88.78</td> <td align="right">4760</td> <td align="right">186.5</td> <td align="right">2110</td> <td align="right">2100</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">88.97</td> <td align="right">4800</td> <td align="right">189.5</td> <td align="right">192.25</td> <td align="right">200.61</td> <td align="right">89.13</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">191.7</td> <td align="right">83.5</td> <td align="right">89.31</td> <td align="right">4840</td> <td align="right">191</td> <td align="right">2070</td> <td align="right">2150</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">89.48</td> <td align="right">4880</td> <td align="right">190.2</td> <td align="right">191</td> <td align="right">201.17</td> <td align="right">89.65</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">188.7</td> <td align="right">79.6</td> <td align="right">89.82</td> <td align="right">4920</td> <td align="right">175.2</td> <td align="right">2060</td> <td align="right">2070</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">89.99</td> <td align="right">4920</td> <td align="right">178.9</td> <td align="right">173.11</td> <td align="right">193.03</td> <td align="right">90.17</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">51.9</td> <td align="right">0</td> <td align="right">90.33</td> <td align="right">4800</td> <td align="right">11.3</td> <td align="right">1010</td> <td align="right">1570</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">90.51</td> <td align="right">4720</td> <td align="right">10.5</td> <td align="right">10</td> <td align="right">5.75</td> <td align="right">90.68</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">12</td> <td align="right">0</td> <td align="right">90.85</td> <td align="right">4560</td> <td align="right">12</td> <td align="right">1010</td> <td align="right">1150</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">91.03</td> <td align="right">4480</td> <td align="right">12</td> <td align="right">11.58</td> <td align="right">13.67</td> <td align="right">91.19</td> <td align="right">178.9</td> <td align="right">177.6</td> <td align="right">12.8</td> <td align="right">0</td> <td align="right">91.37</td> <td align="right">4200</td> <td align="right">12.8</td> <td align="right">1010</td> <td align="right">1090</td> </tr> </tbody></table>

[Brav]

<table width="960" border="0" cellpadding="0" cellspacing="0"><colgroup><col style="width:48pt" span="15" width="64"> </colgroup><tbody><tr style="height:15.0pt" height="20"> <td style="height:15.0pt;width:48pt" width="64" height="20"> </td> <td style="width:48pt" width="64">Engine Speed</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Mass Air Flow</td> <td colspan="2" style="mso-ignore:colspan;width:96pt" width="128">Mass Air Flow</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Engine Load</td> <td colspan="2" style="mso-ignore:colspan;width:96pt" width="128">Wastegate (N75)</td> <td style="width:48pt" width="64">Engine Speed</td> <td style="width:48pt" width="64">Engine Load</td> <td style="width:48pt" width="64">Boost Pressure</td> <td style="width:48pt" width="64">Boost Pressure</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">TIME</td> <td>(G28)</td> <td>
</td> <td>(G70) Bank 1</td> <td>(G246) Bank 2</td> <td>TIME</td> <td>(specified)</td> <td>(spec. corrected)</td> <td>(actual)</td> <td>Duty Cycle</td> <td>TIME</td> <td>(G28)</td> <td>
</td> <td>(specified)</td> <td>(actual)</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">STAMP</td> <td> /min</td> <td> %</td> <td> g/s</td> <td> g/s</td> <td>STAMP</td> <td> %</td> <td> %</td> <td> %</td> <td> %</td> <td>STAMP</td> <td> /min</td> <td> %</td> <td> mbar</td> <td> mbar</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">229.79</td> <td align="right">3320</td> <td align="right">48.9</td> <td align="right">35.11</td> <td align="right">36.06</td> <td align="right">229.96</td> <td align="right">175.9</td> <td align="right">174.6</td> <td align="right">62.4</td> <td align="right">72.5</td> <td align="right">229.62</td> <td align="right">3280</td> <td align="right">48.9</td> <td align="right">1000</td> <td align="right">1190</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">230.3</td> <td align="right">3480</td> <td align="right">104.5</td> <td align="right">104.78</td> <td align="right">98.28</td> <td align="right">230.47</td> <td align="right">176.7</td> <td align="right">174.6</td> <td align="right">124.1</td> <td align="right">99.2</td> <td align="right">230.13</td> <td align="right">3400</td> <td align="right">89.5</td> <td align="right">2330</td> <td align="right">1220</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">230.83</td> <td align="right">3760</td> <td align="right">172.2</td> <td align="right">166.86</td> <td align="right">163.69</td> <td align="right">231.01</td> <td align="right">177.4</td> <td align="right">176.1</td> <td align="right">185</td> <td align="right">90.6</td> <td align="right">230.65</td> <td align="right">3640</td> <td align="right">148.9</td> <td align="right">2360</td> <td align="right">1920</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">231.36</td> <td align="right">4080</td> <td align="right">191.7</td> <td align="right">172.86</td> <td align="right">189.5</td> <td align="right">231.53</td> <td align="right">178.9</td> <td align="right">177.6</td> <td align="right">191.7</td> <td align="right">88.6</td> <td align="right">231.19</td> <td align="right">3960</td> <td align="right">190.2</td> <td align="right">2390</td> <td align="right">2400</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">231.87</td> <td align="right">4400</td> <td align="right">191.7</td> <td align="right">191.06</td> <td align="right">195.61</td> <td align="right">232.05</td> <td align="right">178.9</td> <td align="right">177.6</td> <td align="right">191.7</td> <td align="right">80</td> <td align="right">231.7</td> <td align="right">4280</td> <td align="right">191.7</td> <td align="right">2280</td> <td align="right">2380</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">232.39</td> <td align="right">4680</td> <td align="right">185.7</td> <td align="right">179.86</td> <td align="right">190.67</td> <td align="right">232.57</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">177.4</td> <td align="right">81.2</td> <td align="right">232.22</td> <td align="right">4600</td> <td align="right">191.7</td> <td align="right">2180</td> <td align="right">2210</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">232.91</td> <td align="right">4960</td> <td align="right">169.2</td> <td align="right">179</td> <td align="right">192.78</td> <td align="right">233.07</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">172.9</td> <td align="right">87.1</td> <td align="right">232.73</td> <td align="right">4880</td> <td align="right">171.4</td> <td align="right">2070</td> <td align="right">1980</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">233.42</td> <td align="right">5240</td> <td align="right">176.7</td> <td align="right">198.28</td> <td align="right">211.81</td> <td align="right">233.59</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">173.7</td> <td align="right">91.8</td> <td align="right">233.24</td> <td align="right">5160</td> <td align="right">173.7</td> <td align="right">2020</td> <td align="right">1980</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">233.94</td> <td align="right">5480</td> <td align="right">171.4</td> <td align="right">209.06</td> <td align="right">214.81</td> <td align="right">234.1</td> <td align="right">179.7</td> <td align="right">177.6</td> <td align="right">172.9</td> <td align="right">97.6</td> <td align="right">233.76</td> <td align="right">5400</td> <td align="right">173.7</td> <td align="right">2030</td> <td align="right">1970</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">234.45</td> <td align="right">5720</td> <td align="right">169.9</td> <td align="right">208.36</td> <td align="right">215.39</td> <td align="right">234.62</td> <td align="right">178.2</td> <td align="right">176.1</td> <td align="right">166.9</td> <td align="right">96.1</td> <td align="right">234.28</td> <td align="right">5640</td> <td align="right">171.4</td> <td align="right">2050</td> <td align="right">1910</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">234.96</td> <td align="right">5960</td> <td align="right">166.2</td> <td align="right">209.06</td> <td align="right">211.25</td> <td align="right">235.13</td> <td align="right">176.7</td> <td align="right">174.6</td> <td align="right">163.9</td> <td align="right">95.3</td> <td align="right">234.79</td> <td align="right">5880</td> <td align="right">166.2</td> <td align="right">2080</td> <td align="right">1880</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">235.48</td> <td align="right">6160</td> <td align="right">160.9</td> <td align="right">214.58</td> <td align="right">215.22</td> <td align="right">235.69</td> <td align="right">175.9</td> <td align="right">174.6</td> <td align="right">157.9</td> <td align="right">95.3</td> <td align="right">235.31</td> <td align="right">6080</td> <td align="right">162.4</td> <td align="right">2120</td> <td align="right">1870</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">236.03</td> <td align="right">6400</td> <td align="right">157.1</td> <td align="right">212.28</td> <td align="right">208.42</td> <td align="right">236.21</td> <td align="right">174.4</td> <td align="right">173.1</td> <td align="right">156.4</td> <td align="right">94.9</td> <td align="right">235.86</td> <td align="right">6320</td> <td align="right">156.4</td> <td align="right">2150</td> <td align="right">1820</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" align="right" height="20">236.56</td> <td align="right">6520</td> <td align="right">157.1</td> <td align="right">209.39</td> <td align="right">210.11</td> <td align="right">236.72</td> <td align="right">176.7</td> <td align="right">174.6</td> <td align="right">169.2</td> <td align="right">60</td> <td align="right">236.38</td> <td align="right">6480</td> <td align="right">157.1</td> <td align="right">2170</td> <td align="right">1860</td> </tr> </tbody></table>

[Brav]

So.. I see boost and engine load trailing from specified after 4600 to 4700 rpm, wich is usually where I actually see power pick up. why would this be.. I also see that before and arond this point that engine load has exceeded specified, so maybe when engine load comes down to specified or below, its adding back timing or something?

MAFs - 430 combined, I would say that this is the WHP? 20% loss is 537 crank HP. overall not bad.. but again, I am just trying to sort out my un-smooth power delivery. Or am I a complainer?

Duty cycle on N75 is reacing 98% - is this a concern? need replacement?

Another observation.. 191.7% is max readable engine load %

[ttboost]

I told my tuner that my N75 was ONLY at 95%. he said that is good, any higher and you risk burning it up, it needs a break too...it's relatively normal for MAF's to lead and lag a little...My MAF's read anywhere between 400-430 combined..and my car made 400/460 on an AWD Mustang dyno....so pretty close...

[Brav]

"Ghost-" sent me a PM about his car - also REVO/MTM. he said he has requested boost/actual matching when engine is cooler, and then actual trailing behind a bit more like my later logs after the engine gets hotter. I dont know if the correlation with oil temp is relevant or its something else getting hotter..

I also forgot to mention... that last log - I ran it without my foot pegged.. just against the kick down button. Wanted to see if it made a difference.

[Ghost-]

Hello, in the last post of this thread: http://www.rs6.com/showthread.php/23530-Possible-boost-leak I try to explain what happens with the boost after the engine gets hotter. I notice a +/- 300mbar of boost lost after the engine is hot, so my mechanic and me are wondering what could cause this. We have been looking for info on the internet and the most similar I have found is what Brav is saying and that sometimes, boost hoses tend to "inflate" or develop what is named a "hot fissure" which opens when the hose is hot...

[Brav]

I am pretty sure my DVs are stock - I guess I should be upgrading mine some way?

[Ghost-]

I am pretty sure my DVs are stock - I guess I should be upgrading mine some way?

You dont need to replace them if they are working as they should. To make sure they are working as intended go take a look at page 2 of this "how-to": http://www.forgemotorsport.co.uk/valve_service.pdf

Cheers!

[4everRS]

You dont need to replace them if they are working as they should. To make sure they are working as intended go take a look at page 2 of this "how-to": http://www.forgemotorsport.co.uk/valve_service.pdf

Cheers!
That might work on a spring type DV, but the stockers are a diaphragm type.

[Ghost-]

That might work on a spring type DV, but the stockers are a diaphragm type.
Oops, you are right. Im sorry about that :S

[Brav]

So the stock DVs will either work or not work.. not be "overboosted "?

[srm369]

And you should post that log for us to see!
http://www.progtours.info/zhangwei2.jpg
http://www.progtours.info/zhangwei3.jpg
http://www.progtours.info/zhangwei5.jpg

[ttboost]

I took my DV's off the other day during my troubleshooting marathon. Visually inspected them (still looked new) and used a hand vacuum pump to pump them up to about 20 inches and they held....stuck them back on...took about 8 minutes...

[kday]

Well, I guess there are two failure modes for the DVs: they divert air when they shouldn't, or they don't divert air when they should. The latter case is not really a performance problem (especially on an automatic car), just potentially noisy (chufff) and potentially more wear and tear on the turbos. The former case would look like a boost leak.

I think it'd be safe to temporarily block off the DVs and do another data log to see if it's any different. I've certainly done something similar on other cars, though not the RS6.

[Brav]

And you should post that log for us to see!
http://www.progtours.info/zhangwei2.jpg
http://www.progtours.info/zhangwei3.jpg
http://www.progtours.info/zhangwei5.jpg

Which log is that? and what are the pics you tried to post but dont show up? they appear in my qoute

[Brav]

Well, I guess there are two failure modes for the DVs: they divert air when they shouldn't, or they don't divert air when they should. The latter case is not really a performance problem (especially on an automatic car), just potentially noisy (chufff) and potentially more wear and tear on the turbos. The former case would look like a boost leak.

I think it'd be safe to temporarily block off the DVs and do another data log to see if it's any different. I've certainly done something similar on other cars, though not the RS6.

My understanding is that (like on many other turbo Audis) the stock DVs cant hold the higher boost, not from failure but from limits of the design.

[kday]

Hmm. I ran three different DVs in my Ur-S4. The OEM one (forget the Bosch #), a Bosch 710N valve, and a Forge 007. They all held to 24 PSI OK. The 710N unit only lasted a few years before sticking closed (which results in cool rally car noises on a 5 cylinder), which is why I replaced it with the Forge unit. That's just my anecdotal evidence, of course. They are pretty easy to test for leaks though, so I think I'd do that before replacing them...

There is a problem with holding up to high boost if the valves are installed the wrong way, but I don't think they'd even fit that way in the RS6.

[ttboost]

Hmm...I had the 710N's in my 996 turbo at 20psi for 3 years and never had an issue. I have had them in my RS6 for 1-1/2 years and looked at them the other day and they still look new. When it comes to DV's, I won't use anything but 710N's. Just my experience... Maybe at 25-30 psi, they don't or won't last too long? Can't see ever running that kind of boost in the RS6... not enough waste gate...or transmission...

[Brav]

Well I inspected them before and they were fine.. I was just trying to sort my trailing boost issue. Maybe its natural for this map/car... ?

[ttboost]

It seems most every log I have seen has this feature. The ECU requests boost and it takes time to build it, and when the ECU doesn't want it, it takes time to blow off...kinda natural...

[Ghost-]

Brav, I have some news about this problem.
It seems as stated before by other RS6 members, the hot air getting in the engine makes the ECU send an order to avoid potential engine knocking due to the higher probabilities of this with compressed hot air + gas. So, in order to avoid this, the ECU retards the ignition of the air+gas mixture and lowers boost, resulting in less power:
<table border="0" cellpadding="0" cellspacing="0" width="720"><colgroup><col style="width:60pt" span="9" width="80"> </colgroup><tbody><tr style="height:15.0pt" height="20"> <td style="height:15.0pt;width:60pt" height="20" width="80">
</td> <td style="width:60pt" width="80">Timing Retardation</td> <td style="width:60pt" width="80">Timing Retardation</td> <td style="width:60pt" width="80">Timing Retardation</td> <td style="width:60pt" width="80">Timing Retardation</td> <td style="width:60pt" width="80">Timing Retardation</td> <td style="width:60pt" width="80">Timing Retardation</td> <td style="width:60pt" width="80">Timing Retardation</td> <td style="width:60pt" width="80">Timing Retardation</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">TIME</td> <td>Cylinder 1</td> <td>Cylinder 2</td> <td>Cylinder 3</td> <td>Cylinder 4</td> <td>Cylinder 5</td> <td>Cylinder 6</td> <td>Cylinder 7</td> <td>Cylinder 8</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20">
</td> <td>°KW</td> <td>°KW</td> <td>°KW</td> <td>°KW</td> <td>°KW</td> <td>°KW</td> <td>°KW</td> <td>°KW</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">0.01</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">0.34</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">0.69</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">1.03</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">1.37</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">1.71</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">2.06</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">2.4</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">2.74</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">3.09</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">3.43</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">3.77</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">4.1</td> <td align="right">2.3</td> <td align="right">4.5</td> <td align="right">2.3</td> <td align="right">6</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">4.44</td> <td align="right">4.5</td> <td align="right">4.5</td> <td align="right">2.3</td> <td align="right">6</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">4.79</td> <td align="right">4.5</td> <td align="right">4.5</td> <td align="right">2.3</td> <td align="right">6</td> <td align="right">1.5</td> <td align="right">0</td> <td align="right">0</td> <td align="right">3</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">5.13</td> <td align="right">4.5</td> <td align="right">4.5</td> <td align="right">2.3</td> <td align="right">6</td> <td align="right">0.8</td> <td align="right">0</td> <td align="right">0</td> <td align="right">2.3</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">5.46</td> <td align="right">4.5</td> <td align="right">4.5</td> <td align="right">2.3</td> <td align="right">5.3</td> <td align="right">0.8</td> <td align="right">3</td> <td align="right">0</td> <td align="right">2.3</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">5.78</td> <td align="right">3.8</td> <td align="right">3.8</td> <td align="right">1.5</td> <td align="right">5.3</td> <td align="right">0.8</td> <td align="right">3</td> <td align="right">0</td> <td align="right">2.3</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">6.13</td> <td align="right">3.8</td> <td align="right">3.8</td> <td align="right">1.5</td> <td align="right">5.3</td> <td align="right">0.8</td> <td align="right">3</td> <td align="right">0</td> <td align="right">2.3</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">6.48</td> <td align="right">3.8</td> <td align="right">3.8</td> <td align="right">1.5</td> <td align="right">5.3</td> <td align="right">0.8</td> <td align="right">3</td> <td align="right">0</td> <td align="right">2.3</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">6.81</td> <td align="right">3.8</td> <td align="right">3.8</td> <td align="right">1.5</td> <td align="right">5.3</td> <td align="right">0.8</td> <td align="right">3</td> <td align="right">0</td> <td align="right">2.3</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">7.16</td> <td align="right">3.8</td> <td align="right">3.8</td> <td align="right">1.5</td> <td align="right">5.3</td> <td align="right">0.8</td> <td align="right">3</td> <td align="right">0</td> <td align="right">2.3</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">7.49</td> <td align="right">3.8</td> <td align="right">3.8</td> <td align="right">1.5</td> <td align="right">5.3</td> <td align="right">0</td> <td align="right">3</td> <td align="right">0</td> <td align="right">1.5</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">7.83</td> <td align="right">3.8</td> <td align="right">3.8</td> <td align="right">1.5</td> <td align="right">4.5</td> <td align="right">0</td> <td align="right">2.3</td> <td align="right">0</td> <td align="right">1.5</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">8.16</td> <td align="right">3.8</td> <td align="right">3.8</td> <td align="right">1.5</td> <td align="right">4.5</td> <td align="right">0</td> <td align="right">2.3</td> <td align="right">0</td> <td align="right">1.5</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">8.5</td> <td align="right">3</td> <td align="right">3</td> <td align="right">1.5</td> <td align="right">4.5</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">8.85</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">9.19</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">9.53</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">9.88</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">10.22</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">10.56</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> <tr style="height:15.0pt" height="20"> <td style="height:15.0pt" height="20" align="right">10.91</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> <td align="right">0</td> </tr> </tbody></table>
At 4.1 was the first timing retardation at arround 4000RPM, just after the turbos have peak boost.
Supposedly, a positive value means timing retardation (less power) and a negative value means advanced timing (more power).

[Brav]

Looks like your passenger side bank is more retarded than your right... (LOL?). wonder why. my ignition hit -3 in some cases.. actual timing, not adjustment. so must have been a huge adjustment.

[ttboost]

Sign of an aggressive tune. Those are the trade offs. More timing= more power, but the down side is more opportunity to retard this timing in hot weather, bad gas etc.... Less aggressive tune (lower timing) had less power peaks, but a more consistant power (less timing retard) overall.

[4everRS]

Mike's right about that tune likely being aggressive. I wonder why some cylinders are retarding and some aren't. I mean, is knock sensor voltage sending the signal? Or is it EGT's?

[ttboost]

Probably light knock. Some cylinders are more sensitive to heat than others based on the way the cooling passages go...and more sensitive to detonation based on the intake and how the air gets in there with fuel...High EGT's are a result of big boost and heavy load, usually a problem with a truck towing a trailer with a hot tune....not an RS6....

[4everRS]

So, are there are like 3 knock sensor modules right? And they can be cylinder specific then? I just want to understand how that works.

The way the cooling passages run makes a lot of sense.

[lswing]

Brav, how's the tune been sorting? That's a lot of boost you've been running, and i see a few negative timing numbers. I was in that ballpark, but smoothed it out this week by finding the right balance between boost and timing. All other parameters were looking pretty good, and a reduction of boost, along with an increase in timing, brought me from some negative timing numbers to the lowest being 6.

[ttboost]

I would love to know how people are running megaboost without going into limp mode...

[4everRS]

I would love to know how people are running megaboost without going into limp mode...

It's all about requested vs actual. If actual is a certain level above requested, limp mode. If your tuner can set the requested higher and your hitting those numbers, the ecu doesn't have a problem. According to it, the engine is doing what it is suppose to. Last time I saw your logs, before you turned it down, your actual was well above requested.

[lswing]

It's all about requested vs actual. If actual is a certain level above requested, limp mode. If your tuner can set the requested higher and your hitting those numbers, the ecu doesn't have a problem. According to it, the engine is doing what it is suppose to. Last time I saw your logs, before you turned it down, your actual was well above requested.

So it would lead to a leak somewhere it seems? Or an issue with the turbo(s) not being able to product the boost? Not sure what else would cause the lack of actual....

[4everRS]

So it would lead to a leak somewhere it seems? Or an issue with the turbo(s) not being able to product the boost? Not sure what else would cause the lack of actual....
Re-read. Actual was above.

[lswing]

So does that point to a waste gate issue, too much pressure building, or....?

[ttboost]

I'm not sure why I was able to achieve AND exceed target boost as I have stock wastegates which I believe are only like 3-4lbs springs. So If you hit target boost and don't exceed, no limp.....what if you don't hit target?

[lswing]

Isn't it the n75 that regulates boost pressure, bad n75?

Must be a gap of so many mBar that will trip the limp mode...

I could dig back for a log of yours, but post a fresh one if interested...

[4everRS]

I'm not sure why I was able to achieve AND exceed target boost as I have stock wastegates which I believe are only like 3-4lbs springs. So If you hit target boost and don't exceed, no limp.....what if you don't hit target?

No CEL for lower actual. Problem with that is, after an extended period of the turbos trying to compensate for not hitting the numbers can likely stress them more than they should be.

[4everRS]

Isn't it the n75 that regulates boost pressure, bad n75?

Must be a gap of so many mBar that will trip the limp mode...

I could dig back for a log of yours, but post a fresh one if interested...

Yes, n75 helps regulated pressure. Usually you will see higher actual's if it's the wrong n75. There have been others with different engines that say they make a positive difference, and some negative. Usually very mixed opinions.

When mike and I spoke about it a while back, he had a new, stock, n75. So I'm not sure why his actual's were so high.

[Brav]

Brav, how's the tune been sorting? That's a lot of boost you've been running, and i see a few negative timing numbers. I was in that ballpark, but smoothed it out this week by finding the right balance between boost and timing. All other parameters were looking pretty good, and a reduction of boost, along with an increase in timing, brought me from some negative timing numbers to the lowest being 6.

I want to pull back boost, just need to borrow the SPS tool again. Too much boost will just heat up the engine. Always better to lower boost and run more timing.. happier engine. I just bought a 79 Trans Am, so I have several projects going.. but will get some new logs soon.

[lswing]

I want to pull back boost, just need to borrow the SPS tool again. Too much boost will just heat up the engine. Always better to lower boost and run more timing.. happier engine. I just bought a 79 Trans Am, so I have several projects going.. but will get some new logs soon.

Agreed, that's what has made things smooth for me, as much if not more power, people love the idea of "I run more boost than you bro"....

Now my EGT's still seem debatable, I've heard to high (875), but then I've read that extended highway runs in boost (100+mph) at 900 or above is really where damage could occur...