I promise to post the solution [Archive] - RS6.com

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RS6-4dr911

January 8th, 2010, 05:17

I've been searching like hell through all of the threads on "down on power" and really don't recall seeing any that definitively state what fixed the problem - save one that referred to an "overlay" between the N75 and ECU. Many talk about what they are going to look into and the last post on the thread is someone reminding the OP to please post the solution.

Here's what I've observed: Comparatively sluggish 0-60 times, in the range of 5.4-6.0. New IC's improved the feel noticeably but stopwatch says sluggishness remains. This in 45F weather.

Here's the car:Mostly stock RS6, MTM TCU (18 mos. ago), ITG filters (1mo, ago), new Apikol Intercoolers (OEM's were leaking badly), with Silicone hose kit 93 Octane fuel.

Here's what's been done recently:new ITG filters, recent tranny flush, fluid looked good, IC replacement req'd partial drain, fluid still looked good, 55k svc (plugs replaced), new Apikol IC's and Venair silicone hose kit.

Here are today's logs:
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</td></tr><tr style="height: 12.75pt;" height="17"><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td class="xl23" x:num="0.88541060758288814" x:fmla="=G29/H29" align="right">
</td><td>
</td><td x:num="" align="right">
</td><td class="xl24" x:num="18">
</td><td x:num="" align="right">
</td><td class="xl24" x:num="58.8">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td class="xl23" x:num="0.98170731707317072" x:fmla="=R29/Q29" align="right">
</td></tr><tr style="height: 12.75pt;" height="17"><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td class="xl23" x:num="0.91543340380549687" x:fmla="=G30/H30" align="right">
</td><td>
</td><td x:num="" align="right">
</td><td class="xl24" x:num="0">
</td><td x:num="" align="right">
</td><td class="xl24" x:num="66.3">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td x:num="" align="right">
</td><td class="xl23" x:num="1.0240963855421688" x:fmla="=R30/Q30" align="right">
</td></tr></tbody></table>
Prior to the IC's replacement I logged some tranny data and nothing looked off, RPMs and MPH stayed in lock step, no slip or funny shifting or "plateauing" of speed or RPM's.

I see a number of possible issues but would like to hear from anyone that has actually solved the problem.

It doesn't like the length of my logs so posting separately.

Discuss.

DHall1

January 8th, 2010, 05:28

Here are todays logs?

I see a large blank screen

Ahhhh, better

RS6-4dr911

January 8th, 2010, 05:30

Log 1

<table x:str="" style="border-collapse: collapse; width: 906pt;" width="1208" border="0" cellpadding="0" cellspacing="0"><col style="width: 48pt;" width="64" span="8"> <col style="width: 48pt;" width="64"> <col style="width: 12pt;" width="16"> <col style="width: 48pt;" width="64"> <col style="width: 66pt;" width="88"> <col style="width: 48pt;" width="64"> <col style="width: 48pt;" width="64"> <col style="width: 48pt;" width="64" span="2"> <col style="width: 53pt;" width="71"> <col style="width: 55pt;" width="73"> <col style="width: 48pt;" width="64"> <tbody><tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt; width: 48pt;" width="64" height="17">Time</td> <td class="xl24" style="width: 48pt;" width="64">RPM</td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl24" style="width: 48pt;" width="64">Lambda 1</td> <td class="xl24" style="width: 48pt;" width="64">Lambda 2</td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl24" style="width: 48pt;" width="64">MAF1</td> <td class="xl24" style="width: 48pt;" width="64">MAF2</td> <td class="xl25" style="width: 48pt;" width="64">
</td> <td class="xl24" style="width: 12pt;" width="16">
</td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl26" style="width: 66pt;" x:str="Timing Angle" width="88"> Timing Angle </td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl26" style="width: 48pt;" x:str="N75" width="64"> N75 </td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl24" style="width: 48pt;" width="64">Load</td> <td class="xl24" style="width: 53pt;" width="71">Req Boost</td> <td class="xl24" style="width: 55pt;" width="73">Act Boost</td> <td class="xl25" style="width: 48pt;" width="64">
</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" height="17">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24"> %</td> <td class="xl24"> %</td> <td class="xl24">
</td> <td class="xl24"> g/s</td> <td class="xl24"> g/s</td> <td class="xl25">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl26" x:str=" °BTDC"> °BTDC </td> <td class="xl24">
</td> <td class="xl26" x:str=" %"> % </td> <td class="xl24">
</td> <td class="xl24"> %</td> <td class="xl24"> mbar</td> <td class="xl24"> mbar</td> <td class="xl25">
</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">10.57</td> <td class="xl24" x:num="" align="right">1680</td> <td class="xl24" x:num="" align="right">10.57</td> <td class="xl24" x:num="" align="right">3.1</td> <td class="xl24" x:num="" align="right">1.6</td> <td class="xl24" x:num="" align="right">10.73</td> <td class="xl24" x:num="" align="right">13.03</td> <td class="xl24" x:num="" align="right">13.14</td> <td class="xl27" x:num="0.99162861491628607" align="right">99%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">10.91</td> <td class="xl26" x:num="30"> 30.0 </td> <td class="xl24" x:num="" align="right">11.07</td> <td class="xl26" x:num="0"> - </td> <td class="xl24" x:num="" align="right">10.41</td> <td class="xl24" x:num="" align="right">30.8</td> <td class="xl24" x:num="" align="right">1020</td> <td class="xl24" x:num="" align="right">1050</td> <td class="xl27" x:num="1.0294117647058822" align="right">103%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">11.42</td> <td class="xl24" x:num="" align="right">1840</td> <td class="xl24" x:num="" align="right">11.42</td> <td class="xl24" x:num="" align="right">-3.1</td> <td class="xl24" x:num="" align="right">1.6</td> <td class="xl24" x:num="" align="right">11.6</td> <td class="xl24" x:num="" align="right">32.11</td> <td class="xl24" x:num="" align="right">30.78</td> <td class="xl27" x:num="1.0432098765432098" align="right">104%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">11.76</td> <td class="xl26" x:num="26.3"> 26.3 </td> <td class="xl24" x:num="" align="right">11.93</td> <td class="xl26" x:num="95.3"> 95.3 </td> <td class="xl24" x:num="" align="right">11.25</td> <td class="xl24" x:num="" align="right">40.6</td> <td class="xl24" x:num="" align="right">1020</td> <td class="xl24" x:num="" align="right">1040</td> <td class="xl27" x:num="1.0196078431372548" align="right">102%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">12.27</td> <td class="xl24" x:num="" align="right">1920</td> <td class="xl24" x:num="" align="right">12.27</td> <td class="xl24" x:num="" align="right">3.9</td> <td class="xl24" x:num="" align="right">5.5</td> <td class="xl24" x:num="" align="right">12.43</td> <td class="xl24" x:num="" align="right">39.5</td> <td class="xl24" x:num="" align="right">38.64</td> <td class="xl27" x:num="1.0222567287784678" align="right">102%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">12.61</td> <td class="xl26" x:num="22.5"> 22.5 </td> <td class="xl24" x:num="" align="right">12.77</td> <td class="xl26" x:num="95.3"> 95.3 </td> <td class="xl24" x:num="" align="right">12.11</td> <td class="xl24" x:num="" align="right">80.5</td> <td class="xl24" x:num="" align="right">1680</td> <td class="xl24" x:num="" align="right">1140</td> <td class="xl27" x:num="0.6785714285714286" align="right">68%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">13.12</td> <td class="xl24" x:num="" align="right">2200</td> <td class="xl24" x:num="" align="right">13.12</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">13.28</td> <td class="xl24" x:num="" align="right">52.75</td> <td class="xl24" x:num="" align="right">50.25</td> <td class="xl27" x:num="1.0497512437810945" align="right">105%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">13.46</td> <td class="xl26" x:num="16.5"> 16.5 </td> <td class="xl24" x:num="" align="right">13.64</td> <td class="xl26" x:num="76.1"> 76.1 </td> <td class="xl24" x:num="" align="right">12.93</td> <td class="xl24" x:num="" align="right">91.7</td> <td class="xl24" x:num="" align="right">1730</td> <td class="xl24" x:num="" align="right">1290</td> <td class="xl27" x:num="0.74566473988439308" align="right">75%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">13.98</td> <td class="xl24" x:num="" align="right">2600</td> <td class="xl24" x:num="" align="right">13.98</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">14.15</td> <td class="xl24" x:num="" align="right">80</td> <td class="xl24" x:num="" align="right">66.56</td> <td class="xl27" x:num="1.2019230769230769" align="right">120%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">14.31</td> <td class="xl26" x:num="13.5"> 13.5 </td> <td class="xl24" x:num="" align="right">14.48</td> <td class="xl26" x:num="56.1"> 56.1 </td> <td class="xl24" x:num="" align="right">13.8</td> <td class="xl24" x:num="" align="right">110.5</td> <td class="xl24" x:num="" align="right">1640</td> <td class="xl24" x:num="" align="right">1520</td> <td class="xl27" x:num="0.92682926829268297" align="right">93%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">14.83</td> <td class="xl24" x:num="" align="right">2920</td> <td class="xl24" x:num="" align="right">14.83</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">15</td> <td class="xl24" x:num="" align="right">82.56</td> <td class="xl24" x:num="" align="right">84.92</td> <td class="xl27" x:num="0.97220913801224684" align="right">97%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">15.18</td> <td class="xl26" x:num="15.8"> 15.8 </td> <td class="xl24" x:num="" align="right">15.35</td> <td class="xl26" x:num="53.7"> 53.7 </td> <td class="xl24" x:num="" align="right">14.66</td> <td class="xl24" x:num="" align="right">133.8</td> <td class="xl24" x:num="" align="right">1630</td> <td class="xl24" x:num="" align="right">1720</td> <td class="xl27" x:num="1.0552147239263803" align="right">106%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">15.68</td> <td class="xl24" x:num="" align="right">3320</td> <td class="xl24" x:num="" align="right">15.68</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">15.87</td> <td class="xl24" x:num="" align="right">95.72</td> <td class="xl24" x:num="" align="right">104.72</td> <td class="xl27" x:num="0.91405653170359058" align="right">91%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">16.03</td> <td class="xl26" x:num="13.5"> 13.5 </td> <td class="xl24" x:num="" align="right">16.2</td> <td class="xl26" x:num="49.4"> 49.4 </td> <td class="xl24" x:num="" align="right">15.51</td> <td class="xl24" x:num="" align="right">126.3</td> <td class="xl24" x:num="" align="right">1610</td> <td class="xl24" x:num="" align="right">1620</td> <td class="xl27" x:num="1.0062111801242235" align="right">101%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">16.54</td> <td class="xl24" x:num="" align="right">3680</td> <td class="xl24" x:num="" align="right">16.54</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">16.72</td> <td class="xl24" x:num="" align="right">103.72</td> <td class="xl24" x:num="" align="right">112.39</td> <td class="xl27" x:num="0.92285790550760738" align="right">92%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">16.9</td> <td class="xl26" x:num="16.5"> 16.5 </td> <td class="xl24" x:num="" align="right">17.06</td> <td class="xl26" x:num="45.1"> 45.1 </td> <td class="xl24" x:num="" align="right">16.38</td> <td class="xl24" x:num="" align="right">132.3</td> <td class="xl24" x:num="" align="right">1580</td> <td class="xl24" x:num="" align="right">1640</td> <td class="xl27" x:num="1.0379746835443038" align="right">104%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">17.42</td> <td class="xl24" x:num="" align="right">4040</td> <td class="xl24" x:num="" align="right">17.42</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">17.58</td> <td class="xl24" x:num="" align="right">115.81</td> <td class="xl24" x:num="" align="right">123.92</td> <td class="xl27" x:num="0.93455455132343446" align="right">93%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">17.75</td> <td class="xl26" x:num="16.5"> 16.5 </td> <td class="xl24" x:num="" align="right">17.93</td> <td class="xl26" x:num="44.7"> 44.7 </td> <td class="xl24" x:num="" align="right">17.23</td> <td class="xl24" x:num="" align="right">128.6</td> <td class="xl24" x:num="" align="right">1570</td> <td class="xl24" x:num="" align="right">1580</td> <td class="xl27" x:num="1.0063694267515924" align="right">101%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">18.27</td> <td class="xl24" x:num="" align="right">4400</td> <td class="xl24" x:num="" align="right">18.27</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">18.43</td> <td class="xl24" x:num="" align="right">127.03</td> <td class="xl24" x:num="" align="right">140.33</td> <td class="xl27" x:num="0.90522340198104456" align="right">91%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">18.61</td> <td class="xl26" x:num="12.8"> 12.8 </td> <td class="xl24" x:num="" align="right">18.76</td> <td class="xl26" x:num="0"> - </td> <td class="xl24" x:num="" align="right">18.12</td> <td class="xl24" x:num="" align="right">129.3</td> <td class="xl24" x:num="" align="right">1600</td> <td class="xl24" x:num="" align="right">1580</td> <td class="xl27" x:num="0.98750000000000004" align="right">99%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" height="17">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl27">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl26">
</td> <td class="xl24">
</td> <td class="xl26">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl27">
</td> </tr> </tbody></table>

RS6-4dr911

January 8th, 2010, 05:31

Log 2

<table x:str="" style="border-collapse: collapse; width: 906pt;" width="1208" border="0" cellpadding="0" cellspacing="0"><col style="width: 48pt;" width="64" span="8"> <col style="width: 48pt;" width="64"> <col style="width: 12pt;" width="16"> <col style="width: 48pt;" width="64"> <col style="width: 66pt;" width="88"> <col style="width: 48pt;" width="64"> <col style="width: 48pt;" width="64"> <col style="width: 48pt;" width="64" span="2"> <col style="width: 53pt;" width="71"> <col style="width: 55pt;" width="73"> <col style="width: 48pt;" width="64"> <tbody><tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt; width: 48pt;" width="64" height="17">Time</td> <td class="xl24" style="width: 48pt;" width="64">RPM</td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl24" style="width: 48pt;" width="64">Lambda 1</td> <td class="xl24" style="width: 48pt;" width="64">Lambda 2</td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl24" style="width: 48pt;" width="64">MAF1</td> <td class="xl24" style="width: 48pt;" width="64">MAF2</td> <td class="xl25" style="width: 48pt;" width="64">
</td> <td class="xl24" style="width: 12pt;" width="16">
</td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl26" style="width: 66pt;" x:str="Timing Angle" width="88"> Timing Angle </td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl26" style="width: 48pt;" x:str="N75" width="64"> N75 </td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl24" style="width: 48pt;" width="64">Load</td> <td class="xl24" style="width: 53pt;" width="71">Req Boost</td> <td class="xl24" style="width: 55pt;" width="73">Act Boost</td> <td class="xl25" style="width: 48pt;" width="64">
</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" height="17">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24"> %</td> <td class="xl24"> %</td> <td class="xl24">
</td> <td class="xl24"> g/s</td> <td class="xl24"> g/s</td> <td class="xl25">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl26" x:str=" °BTDC"> °BTDC </td> <td class="xl24">
</td> <td class="xl26" x:str=" %"> % </td> <td class="xl24">
</td> <td class="xl24"> %</td> <td class="xl24"> mbar</td> <td class="xl24"> mbar</td> <td class="xl25">
</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">37.07</td> <td class="xl24" x:num="" align="right">2680</td> <td class="xl24" x:num="" align="right">37.07</td> <td class="xl24" x:num="" align="right">2.3</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">37.24</td> <td class="xl24" x:num="" align="right">62.47</td> <td class="xl24" x:num="" align="right">61.58</td> <td class="xl27" x:num="1.0144527443975317" align="right">101%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">37.42</td> <td class="xl26" x:num="23.3"> 23.3 </td> <td class="xl24" x:num="" align="right">37.58</td> <td class="xl26" x:num="52.2"> 52.2 </td> <td class="xl24" x:num="" align="right">36.9</td> <td class="xl24" x:num="" align="right">60.2</td> <td class="xl24" x:num="" align="right">1440</td> <td class="xl24" x:num="" align="right">1060</td> <td class="xl27" x:num="0.73611111111111116" align="right">74%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">37.94</td> <td class="xl24" x:num="" align="right">3360</td> <td class="xl24" x:num="" align="right">37.94</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">38.12</td> <td class="xl24" x:num="" align="right">99.58</td> <td class="xl24" x:num="" align="right">111.36</td> <td class="xl27" x:num="0.89421695402298851" align="right">89%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">38.28</td> <td class="xl26" x:num="15.8"> 15.8 </td> <td class="xl24" x:num="" align="right">38.46</td> <td class="xl26" x:num="45.9"> 45.9 </td> <td class="xl24" x:num="" align="right">37.75</td> <td class="xl24" x:num="" align="right">117.3</td> <td class="xl24" x:num="" align="right">1620</td> <td class="xl24" x:num="" align="right">1570</td> <td class="xl27" x:num="0.96913580246913578" align="right">97%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">38.8</td> <td class="xl24" x:num="" align="right">4040</td> <td class="xl24" x:num="" align="right">38.8</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">38.97</td> <td class="xl24" x:num="" align="right">113</td> <td class="xl24" x:num="" align="right">126.39</td> <td class="xl27" x:num="0.89405807421473216" align="right">89%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">39.16</td> <td class="xl26" x:num="14.3"> 14.3 </td> <td class="xl24" x:num="" align="right">39.32</td> <td class="xl26" x:num="46.3"> 46.3 </td> <td class="xl24" x:num="" align="right">38.64</td> <td class="xl24" x:num="" align="right">132.3</td> <td class="xl24" x:num="" align="right">1570</td> <td class="xl24" x:num="" align="right">1620</td> <td class="xl27" x:num="1.0318471337579618" align="right">103%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">39.67</td> <td class="xl24" x:num="" align="right">4680</td> <td class="xl24" x:num="" align="right">39.67</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">39.83</td> <td class="xl24" x:num="" align="right">141.42</td> <td class="xl24" x:num="" align="right">156.28</td> <td class="xl27" x:num="0.90491425646275903" align="right">90%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">40</td> <td class="xl26" x:num="15.8"> 15.8 </td> <td class="xl24" x:num="" align="right">40.19</td> <td class="xl26" x:num="54.5"> 54.5 </td> <td class="xl24" x:num="" align="right">39.49</td> <td class="xl24" x:num="" align="right">130.1</td> <td class="xl24" x:num="" align="right">1620</td> <td class="xl24" x:num="" align="right">1560</td> <td class="xl27" x:num="0.96296296296296291" align="right">96%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">40.53</td> <td class="xl24" x:num="" align="right">5400</td> <td class="xl24" x:num="" align="right">40.53</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">40.7</td> <td class="xl24" x:num="" align="right">167.94</td> <td class="xl24" x:num="" align="right">178.33</td> <td class="xl27" x:num="0.94173722873324728" align="right">94%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">40.89</td> <td class="xl26" x:num="11.3"> 11.3 </td> <td class="xl24" x:num="" align="right">41.05</td> <td class="xl26" x:num="66.7"> 66.7 </td> <td class="xl24" x:num="" align="right">40.38</td> <td class="xl24" x:num="" align="right">139.8</td> <td class="xl24" x:num="" align="right">1630</td> <td class="xl24" x:num="" align="right">1630</td> <td class="xl27" x:num="1" align="right">100%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">41.41</td> <td class="xl24" x:num="" align="right">6120</td> <td class="xl24" x:num="" align="right">41.41</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">41.57</td> <td class="xl24" x:num="" align="right">101.42</td> <td class="xl24" x:num="" align="right">142.81</td> <td class="xl27" x:num="0.71017435753798752" align="right">71%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">41.73</td> <td class="xl26" x:num="47.3"> 47.3 </td> <td class="xl24" x:num="" align="right">41.9</td> <td class="xl26" x:num="0"> - </td> <td class="xl24" x:num="" align="right">41.22</td> <td class="xl24" x:num="" align="right">147.4</td> <td class="xl24" x:num="" align="right">1670</td> <td class="xl24" x:num="" align="right">1700</td> <td class="xl27" x:num="1.0179640718562875" align="right">102%</td> </tr> </tbody></table>

RS6-4dr911

January 8th, 2010, 05:32

Log 3

<table x:str="" style="border-collapse: collapse; width: 906pt;" width="1208" border="0" cellpadding="0" cellspacing="0"><col style="width: 48pt;" width="64" span="8"> <col style="width: 48pt;" width="64"> <col style="width: 12pt;" width="16"> <col style="width: 48pt;" width="64"> <col style="width: 66pt;" width="88"> <col style="width: 48pt;" width="64"> <col style="width: 48pt;" width="64"> <col style="width: 48pt;" width="64" span="2"> <col style="width: 53pt;" width="71"> <col style="width: 55pt;" width="73"> <col style="width: 48pt;" width="64"> <tbody><tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt; width: 48pt;" width="64" height="17">Time</td> <td class="xl24" style="width: 48pt;" width="64">RPM</td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl24" style="width: 48pt;" width="64">Lambda 1</td> <td class="xl24" style="width: 48pt;" width="64">Lambda 2</td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl24" style="width: 48pt;" width="64">MAF1</td> <td class="xl24" style="width: 48pt;" width="64">MAF2</td> <td class="xl25" style="width: 48pt;" width="64">
</td> <td class="xl24" style="width: 12pt;" width="16">
</td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl26" style="width: 66pt;" x:str="Timing Angle" width="88"> Timing Angle </td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl26" style="width: 48pt;" x:str="N75" width="64"> N75 </td> <td class="xl24" style="width: 48pt;" width="64">Time</td> <td class="xl24" style="width: 48pt;" width="64">Load</td> <td class="xl24" style="width: 53pt;" width="71">Req Boost</td> <td class="xl24" style="width: 55pt;" width="73">Act Boost</td> <td class="xl25" style="width: 48pt;" width="64">
</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" height="17">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl24"> %</td> <td class="xl24"> %</td> <td class="xl24">
</td> <td class="xl24"> g/s</td> <td class="xl24"> g/s</td> <td class="xl25">
</td> <td class="xl24">
</td> <td class="xl24">
</td> <td class="xl26" x:str=" °BTDC"> °BTDC </td> <td class="xl24">
</td> <td class="xl26" x:str=" %"> % </td> <td class="xl24">
</td> <td class="xl24"> %</td> <td class="xl24"> mbar</td> <td class="xl24"> mbar</td> <td class="xl25">
</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">188.47</td> <td class="xl24" x:num="" align="right">2480</td> <td class="xl24" x:num="" align="right">188.47</td> <td class="xl24" x:num="" align="right">1.6</td> <td class="xl24" x:num="" align="right">1.6</td> <td class="xl24" x:num="" align="right">188.66</td> <td class="xl24" x:num="" align="right">69.83</td> <td class="xl24" x:num="" align="right">60.53</td> <td class="xl27" x:num="1.1536428217412853" align="right">115%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">188.82</td> <td class="xl26" x:num="18"> 18.0 </td> <td class="xl24" x:num="" align="right">188.15</td> <td class="xl26" x:num="95.3"> 95.3 </td> <td class="xl24" x:num="" align="right">188.3</td> <td class="xl24" x:num="" align="right">81.2</td> <td class="xl24" x:num="" align="right">1680</td> <td class="xl24" x:num="" align="right">1130</td> <td class="xl27" x:num="0.67261904761904767" align="right">67%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">189.34</td> <td class="xl24" x:num="" align="right">3240</td> <td class="xl24" x:num="" align="right">189.34</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">189.51</td> <td class="xl24" x:num="" align="right">101.08</td> <td class="xl24" x:num="" align="right">110.69</td> <td class="xl27" x:num="0.91318095582256753" align="right">91%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">189.69</td> <td class="xl26" x:num="15.8"> 15.8 </td> <td class="xl24" x:num="" align="right">188.99</td> <td class="xl26" x:num="51.8"> 51.8 </td> <td class="xl24" x:num="" align="right">189.18</td> <td class="xl24" x:num="" align="right">127.1</td> <td class="xl24" x:num="" align="right">1620</td> <td class="xl24" x:num="" align="right">1660</td> <td class="xl27" x:num="1.0246913580246915" align="right">102%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">190.21</td> <td class="xl24" x:num="" align="right">4120</td> <td class="xl24" x:num="" align="right">190.21</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">190.38</td> <td class="xl24" x:num="" align="right">123</td> <td class="xl24" x:num="" align="right">128.78</td> <td class="xl27" x:num="0.95511725423202365" align="right">96%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">190.53</td> <td class="xl26" x:num="12.8"> 12.8 </td> <td class="xl24" x:num="" align="right">189.88</td> <td class="xl26" x:num="46.7"> 46.7 </td> <td class="xl24" x:num="" align="right">190.04</td> <td class="xl24" x:num="" align="right">133.1</td> <td class="xl24" x:num="" align="right">1570</td> <td class="xl24" x:num="" align="right">1620</td> <td class="xl27" x:num="1.0318471337579618" align="right">103%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">191.04</td> <td class="xl24" x:num="" align="right">4880</td> <td class="xl24" x:num="" align="right">191.04</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">191.2</td> <td class="xl24" x:num="" align="right">150.72</td> <td class="xl24" x:num="" align="right">165.25</td> <td class="xl27" x:num="0.91207261724659605" align="right">91%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">191.39</td> <td class="xl26" x:num="15.8"> 15.8 </td> <td class="xl24" x:num="" align="right">190.69</td> <td class="xl26" x:num="49"> 49.0 </td> <td class="xl24" x:num="" align="right">190.87</td> <td class="xl24" x:num="" align="right">131.6</td> <td class="xl24" x:num="" align="right">1640</td> <td class="xl24" x:num="" align="right">1580</td> <td class="xl27" x:num="0.96341463414634143" align="right">96%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">191.88</td> <td class="xl24" x:num="" align="right">5640</td> <td class="xl24" x:num="" align="right">191.88</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">192.03</td> <td class="xl24" x:num="" align="right">167.44</td> <td class="xl24" x:num="" align="right">189.11</td> <td class="xl27" x:num="0.88541060758288814" align="right">89%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">192.2</td> <td class="xl26" x:num="18"> 18.0 </td> <td class="xl24" x:num="" align="right">191.55</td> <td class="xl26" x:num="58.8"> 58.8 </td> <td class="xl24" x:num="" align="right">191.71</td> <td class="xl24" x:num="" align="right">138.3</td> <td class="xl24" x:num="" align="right">1640</td> <td class="xl24" x:num="" align="right">1610</td> <td class="xl27" x:num="0.98170731707317072" align="right">98%</td> </tr> <tr style="height: 12.75pt;" height="17"> <td class="xl24" style="height: 12.75pt;" x:num="" align="right" height="17">192.71</td> <td class="xl24" x:num="" align="right">6320</td> <td class="xl24" x:num="" align="right">192.71</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">0</td> <td class="xl24" x:num="" align="right">192.9</td> <td class="xl24" x:num="" align="right">186.19</td> <td class="xl24" x:num="" align="right">203.39</td> <td class="xl27" x:num="0.91543340380549687" align="right">92%</td> <td class="xl24">
</td> <td class="xl24" x:num="" align="right">193.06</td> <td class="xl26" x:num="0"> - </td> <td class="xl24" x:num="" align="right">192.38</td> <td class="xl26" x:num="66.3"> 66.3 </td> <td class="xl24" x:num="" align="right">192.54</td> <td class="xl24" x:num="" align="right">146.6</td> <td class="xl24" x:num="" align="right">1660</td> <td class="xl24" x:num="" align="right">1700</td> <td class="xl27" x:num="1.0240963855421688" align="right">102%</td> </tr> </tbody></table>

RS6-4dr911

January 8th, 2010, 05:33

Here are todays logs?

I see a large blank screen

Patience grasshopper

DHall1

January 8th, 2010, 05:35

Edit: MTM trans chip...I didnt read properly......your trans is toast or ECU is pulling some boost.

Best guess.

Now, there are any number of reasons why the ECU would call for reduced boost levels. But its not like a major fault happened because your still getting almost stock levels of boost.

If there was a major fault the boost would go right to 1000 and stay there. (Gerry can chime up on that one)

Clear all codes and reset the ecu. Do it again with more logs after the reset.

RS6-4dr911

January 8th, 2010, 05:45

The MTM TCU chip is toast?? It's a stock ECU.

And as for the trans being toast, that doesn't seem consistent with clean unburnt fluid at flush or minor drain and topoff and general seat of the pants proper operation. Also logs (which I will redo) for trans parameters seemed okay. Tell me what to blocks to log to verify proper operation and I'll make sure they're in my saved log list.

DHall1

January 8th, 2010, 06:06

This could be one of those P3u deals that takes weeks and months to surface. You cant log rpm/engine speed 24hr a day.

I say clear/reset/new logs. Its not like the boost is crap. Its almost to stock levels.

RS6-4dr911

January 8th, 2010, 06:13

batty

January 8th, 2010, 08:28

just a thought - you've stated 93 octane. is that a typo ? The euro spec is to use 98 octane.

Qisha

January 8th, 2010, 12:09

Dear RS6-4dr911,

i would assume a faulty wiring going to the MAFs. The MAFs themself are most likely not the problem. If the signal coming from the MAFs is "not clean" -> could cause an issue as described.

Anyway, check your brake-light switch.

Qisha

RS6Steve

January 8th, 2010, 12:25

MAF 1 is so different to 2...

My guess change MAF 1, or the wiring.

MaxRS6

January 8th, 2010, 13:29

MAF 1 is so different to 2...

My guess change MAF 1, or the wiring.

My uneducated/unprofessional and generally numb grey matter's pure guess would be the above and/or the solenoid.

JRS-RS6

January 8th, 2010, 14:24

just a thought - you've stated 93 octane. is that a typo ? The euro spec is to use 98 octane.

Hi Batty,

93 Octane is (R+M)/2 Method for US -- it is roughly the same as your 98 Octane rating (RON) in the UK. Google Octane there are lots of links to find that explain this in greater detail.

Example from:

http://en.wikipedia.org/wiki/Octane_rating#Difference_between_RON_and_AKI

Difference between RON and AKI

"Because of the 8 to 10 point difference noted above, the octane rating shown in the United States is 4 to 5 points lower than the rating shown elsewhere in the world for the same fuel.".

p3u

January 8th, 2010, 18:31

IIRC however, p3u's problem was intermittent, mine has been very consistent.

I'm surprised you didn't make any comments on the MAF difference, I also meant to post the trouble code scan that is always there,

Address 01: Engine Labels: 077-907-558-BCY.lbl
Part No: 4D1 907 558 D
Component: 4.2l V8/5VT G 0003
Coding: 0006752
Shop #: WSC 02561 772 34112

3 Faults Found:
16487 - Mass Air Flow Sensor (G70): Signal too High
P0103 - 001 - Upper Limit Exceeded - Intermittent
17482 - Mass Air Flow Sensor 2 (G246): Signal too High
P1074 - 001 - Upper Limit Exceeded - Intermittent
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 002 - Lower Limit Exceeded - Intermittent
Readiness: 0000 0000

I'll reset the ECU in the AM and rerun some logs as above as well as the trans set I ran previously.

A couple things.

While my issue was intermittent, it was consistently intermittent.

Also, I had the same error with my MAFS, had them replaced, still threw that code. Had the connectors replaced, still had the code. Had the section of wiring replaced, still had the issue. Had the tranny replaced, no more codes for it.

I think the source of that code is the tranny slipping causing the rpms to rise faster then the corresponding speed of the car in gear, and more air is going through the sensor for the given speed vs rpm vs gear, hence the exceeding upper limit, even when everything that has to do with the mafs is fine.

Just my experience with it.

DHall1

January 8th, 2010, 18:39

Nice addition p3u

This could be one of those P3u deals that takes weeks and months to surface. You cant log rpm/engine speed 24hr a day.

I say clear/reset/new logs. Its not like the boost is crap. Its almost to stock levels.

dmross

January 8th, 2010, 18:52

I'll update my threads to confirm that the new tranny is my "solution" as soon as I get my car back from IPT.

MaxRS6

January 8th, 2010, 19:23

I'll update my threads to confirm that the new tranny is my "solution" as soon as I get my car back from IPT.

about a month, and I must say- the performance seems great from my seat of the pants dyno (could be a placebo effect- who knows).

My complaints with IPT were just that it took much longer than Ty told me it would take- second it was like pulling teeth to get information about the status from Ty, and he in fact just told untruths about it having shipped when it had not- and third the tranny was received with pan and strainer bent up due to the way it was "strapped" on the pallet. To date- IPT has refused to process a freight claim or reimburse for the part cost.

However; I can put up with a little bullsh*t to have a performing tranny that I trust will perform for miles to come.

Good luck, and I look forward to hearing about your experience and opinions on the tranny!

p3u

January 8th, 2010, 19:53

about a month, and I must say- the performance seems great from my seat of the pants dyno (could be a placebo effect- who knows).

My complaints with IPT were just that it took much longer than Ty told me it would take- second it was like pulling teeth to get information about the status from Ty, and he in fact just told untruths about it having shipped when it had not- and third the tranny was received with pan and strainer bent up due to the way it was "strapped" on the pallet. To date- IPT has refused to process a freight claim or reimburse for the part cost.

However; I can put up with a little bullsh*t to have a performing tranny that I trust will perform for miles to come.

Good luck, and I look forward to hearing about your experience and opinions on the tranny!

I didn't go with itp for the same reason, being lied to...

I called Ty and told him what was going on and told him I wanted to have them build my tranny, and that he would call me back with the details by the next day. I waited a week before I called back and when I spoke with him and asked if he was able to get the information I needed he said "what information?". I tell him the information that he was going to call me back by the next day with. He trieds to play it off "oh yeah, I'm just waiting to hear back from my guy, ill give you a call back in a bit with it.". I never received a call back, and I would never call them back after trying to give them business and being treated like an idiot.

Quality or not, I won't work with a company if they don't treat me how I would expect to be if spending some money.

MaxRS6

January 8th, 2010, 19:58

I didn't go with itp for the same reason, being lied to...

Quality or not, I won't work with a company if they don't treat me how I would expect to be if spending some money.

started only after they had the tranny in their shop. If I had known about Ty's "issues", I would have gone elsewhere like sh*t out a goose.

MaxRS6

January 8th, 2010, 21:08

. May not be helpful but thought I would let you see it. It hurts my head to read through the entire thread.

P0103 (Mass or Volume Air Flow Circ. High Input) and P1557 (charge Pressure Contr. Positive Deviation): Check for Air Leaks in Pressure Side Air Duct.

http://forums.audiworld.com/showthread.php?p=16357871

Hail mary and I don't have a clue if it is even pertinent.

RS6-4dr911

January 23rd, 2010, 13:54

Ran logs on the transmission to rule that out. Looks like it's fine to me. Engine rpms, input shaft (to trans after TC), output shaft and vehicle speed all look to move in lock step. Think we can rule this one out for now.
http://i843.photobucket.com/albums/zz356/blatham489/TransCheck.jpg (http://s843.photobucket.com/albums/zz356/blatham489/?action=view&current=TransCheck.jpg)

And with the new intercoolers, the MAF error code is gone. So it looks like the error there was caused by the amount of air going through them not matching the rpm's as p3u pointed out, but it's because all the air that went through the MAF didn't make it past the IC's due to the leaks.

From what's been posted, pretty much only leaves N75 and MAF's. I've got logs of the N75 duty cycle but not really sure what readings should be. Anyone know what I should be looking for?

This article I found could be interesting for checking the MAF's.

http://www.mxcom.net/hearst/motor/fu.../072006_04.pdf (http://www.mxcom.net/hearst/motor/fuel/001/072006_04.pdf)

Shoppinit

January 23rd, 2010, 22:29

Surely the MAFs are only approximative and the mixture is corrected by the O2 sensor readings?

Forgive me if this is a stupid question, but what has the trans got to do with MAFs???

ttboost

January 23rd, 2010, 22:55

Surely the MAFs are only approximative and the mixture is corrected by the O2 sensor readings?

Forgive me if this is a stupid question, but what has the trans got to do with MAFs???

Just a guess, but the MAF tells the ECU how much air is coming in (for lack of a better description), the ECU knows how fast the engine is turning (RPM's) and the TCU knows how fast the tranny should be turning in a certain gear. The O2 will keep trying to correct (in this case, it actually isn't necessary). If the tranny slips, NONE of those numbers match and all hell breaks loose...am I close?

RS6-4dr911

January 23rd, 2010, 23:16

I believe you are correct. The reason I was investigating the tranny Shoppinit was because p3u had mentioned he too had reduced power and MAF error codes, all resulting from a slipping tranny, so I was simply ruling it out as possible cause.

ttboost

January 23rd, 2010, 23:22

peiserg

January 24th, 2010, 02:17

I strongly suspect the main problem here is--

needs more cowbell.

HTH.
G to the P.

Shoppinit

January 24th, 2010, 08:25

RS6-4dr911

January 24th, 2010, 12:07

I strongly suspect the main problem here is--

needs more cowbell.

HTH.
G to the P.

Sorry, not hip enough, what is G to the P ?<object width="425" height="344">

<embed src="http://www.youtube.com/v/q4royOLtvmQ&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></object>

RS6-4dr911

January 24th, 2010, 12:19

I just don't see the tranny being an issue here. I'm convinced that there's no connection between the MAF and the output rpms from the tranny. There's just no reason why there would be. Engine RPM would be a big factor in calculating the fueling, and this is why the engine has its own (accurate) speed sensors but as far as I can see, the only reason the tranny would cause problems is if it was asking the engine to cut boost (it isn't) or the TC was slipping (it doesn't appear to be).

Have you had any 0-60 times to compare to? Mine averages about 5.5s to 60 and I know my power is there because I've had it rolling roaded.

How about putting your logs up to download in xls / csv format so I can compare to mine?

It's not an issue as it turns out, but it could have been if it were slipping. The RS6 (like many cars now) has many data checks to keep it from self-destructing. If it detected slippage, others have had cases where boost was cut or full limp node entered as the car sensed something amiss.

Previously with VAG and Dynolicious my times were in the 6.0 range which is what set me on my hunt for a problem to begin with. New IC's perked it up, ran roughly 5.5, haven't had chance to thoroughly check it after an ECU reset, waiting for a label file for VAGCOM. Will report back after that and possibly after trying to clean MAF's, in spite of Dave's $0.02 (M5 guys do it regularly with good results).

peiserg

January 24th, 2010, 18:55

i refuse to beleive you are not hip enough.

"peiserg" aka gerry peiser. G to the P is my stage name i use when introducing myself to my patients.

Sorry, not hip enough, what is G to the P ?<object width="425" height="344">

<embed src="http://www.youtube.com/v/q4royOLtvmQ&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></object>

RS6-4dr911

January 24th, 2010, 19:44

Correction, MAF error codes still there:doh:

Shoppinit

January 24th, 2010, 19:45

If you've got MAF error codes, and since the RS6 is prone to eating MAFs, I'd say your next stop is changing the MAFs :)

Question: Does the RS6 use O2 sensor information under WOT?

RS6-4dr911

January 25th, 2010, 04:23

If you've got MAF error codes, and since the RS6 is prone to eating MAFs, I'd say your next stop is changing the MAFs :)

Question: Does the RS6 use O2 sensor information under WOT?

I seem to remember Dave saying they go into open loop under WOT and my logs today show Lamda going to zero under WOT so that seems to confirm it.

Shopping for MAF's tomorrow.

0-60 times were consistently 5.5-5.8 today. For those interested, VAG and Dynolicious were always within a tenth of each other. They may both suck but they do so equally. But actually they seem pretty accurate.

Shoppinit

January 25th, 2010, 12:00

I think the vagcom is pretty accurate. The vehicule speed sensor certainly is to within 1pc or so. No reason why your PC wouldn't be able to keep time to within a few nanoseconds over that time, so I'd say the vagcom method is accurate. That would mean that the dynolicious would be too. I have compared the vagcom and G-tech RR and been left wanting by the g-tech;

I remember dave talking about no lambda control under WOT, but he wasn't sure. If it is the case then the car will be relying only on MAF readings for the fueling...

Another thing which is lurking at the back of my mind is that IC leaks might cause a slower 0-60 time. I know you've changed yours, but I'm thinking of my case. If there's a leak then it'll take longer for the turbo to pressurise them, so it'll take longer to get to full power, even if you eventually do get to full power.

I wonder what the deal is with larger intercoolers, like the Wagners. Surely these'll also take longer to pressurise?

RS6-4dr911

January 25th, 2010, 14:27

Yes, this is much improved (about 1/2 sec to 60 and noticeably improved top end performance) after the IC replacement. The Apikols are only slightly smaller than the Wagners and most of those user have reported no increase in lag, which stands to reason given the volume of the entire pressurized system vs. the minor increase in the IC volume.

You asked for 0-60 times, posted below for comparison:

Sunday,24,January,2010,14:36:20:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G 0003

Metric units
0 to 100 km/h: 5.7 +- 1.03s
400m: 19.8 +- 0.99s, @55 km/h
90-120 km/h:
200 meters: 9.4 +- 1.01s, @98 km/h

US Units
0 to 60 mph: 5.4 +- 1.03s
1/4 mile: 20.0 +- 0.99s, @34 mph
60-90 mph:
660 feet: 9.4 +- 1.01s, @61 mph

Time(s) km/h m
0.00 0.0 0.0
0.50 1.0 0.1
1.00 12.0 1.8
1.52 23.0 5.1
2.04 35.0 10.2
2.55 47.0 16.9
3.07 57.0 25.0
3.58 66.0 34.5
4.10 75.0 45.3
4.61 82.0 56.8
5.12 89.0 69.5
5.63 96.0 83.0
6.15 103.0 98.0
6.66 109.0 113.4
7.17 112.0 129.3
7.69 111.0 145.3
8.20 109.0 160.8
8.71 105.0 175.7
9.22 100.0 189.8

Sunday,24,January,2010,14:39:43:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G 0003

Metric units
0 to 100 km/h: 6.0 +- 1.04s
400m:
90-120 km/h:
200 meters: 9.7 +- 1.03s, @92 km/h

US Units
0 to 60 mph: 5.7 +- 1.03s
1/4 mile:
60-90 mph:
660 feet: 9.7 +- 1.03s, @57 mph

Time(s) km/h m
0.00 0.0 0.0
0.52 1.0 0.1
1.04 9.0 1.4
1.55 20.0 4.3
2.07 30.0 8.6
2.58 42.0 14.5
3.08 52.0 21.8
3.61 62.0 30.9
4.12 70.0 40.8
4.64 78.0 52.1
5.15 85.0 64.2
5.65 92.0 77.0
6.16 99.0 90.9
6.68 106.0 106.3

Sunday,24,January,2010,14:41:28:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G 0003

Metric units
0 to 100 km/h: 5.9 +- 1.01s
400m: 23.3 +- 1.02s, @29 km/h
90-120 km/h:
200 meters: 9.4 +- 1.01s, @103 km/h

US Units
0 to 60 mph: 5.6 +- 1.01s
1/4 mile: 23.7 +- 1.01s, @17 mph
60-90 mph:
660 feet: 9.4 +- 1.01s, @64 mph

Time(s) km/h m
0.00 0.0 0.0
0.50 1.0 0.1
1.02 12.0 1.9
1.54 22.0 5.1
2.05 33.0 9.7
2.57 44.0 16.0
3.08 54.0 23.8
3.58 63.0 32.5
4.08 72.0 42.6
4.59 79.0 53.8
5.11 86.0 66.1
5.64 93.0 79.7
6.14 100.0 93.8

Sunday,24,January,2010,14:47:10:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G 0003

Metric units
0 to 100 km/h: 6.2 +- 1.04s
400m: 26.8 +- 1.04s, @24 km/h
90-120 km/h:
200 meters: 9.5 +- 1.04s, @103 km/h

US Units
0 to 60 mph: 5.9 +- 1.04s
1/4 mile: 27.3 +- 1.04s, @15 mph
60-90 mph:
660 feet: 9.5 +- 1.04s, @64 mph

Time(s) km/h m
0.00 0.0 0.0
0.52 1.0 0.1
1.01 11.0 1.6
1.51 20.0 4.4
2.01 30.0 8.6
2.52 40.0 14.3
3.03 51.0 21.4
3.55 60.0 30.2
4.08 69.0 40.2
4.59 76.0 51.1
5.11 83.0 63.0
5.61 89.0 75.4
6.12 96.0 89.0
6.64 102.0 103.8

Sunday,24,January,2010,14:48:15:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G 0003

Metric units
0 to 100 km/h: 6.0 +- 1.02s
400m:
90-120 km/h:
200 meters: 9.7 +- 1.03s, @83 km/h

US Units
0 to 60 mph: 5.7 +- 1.04s
1/4 mile:
60-90 mph:
660 feet: 9.7 +- 1.03s, @52 mph

Time(s) km/h m
0.00 0.0 0.0
0.52 4.0 0.6
1.03 15.0 2.7
1.54 25.0 6.2
2.04 35.0 11.1
2.54 45.0 17.4
3.06 55.0 25.3
3.58 64.0 34.5
4.10 73.0 45.0
4.61 80.0 56.4
5.12 86.0 68.6
5.63 93.0 81.7
6.14 99.0 95.8
6.64 105.0 110.4

Sunday,24,January,2010,14:50:27:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G 0003

Metric units
0 to 100 km/h: 5.8 +- 1.06s
400m: 16.5 +- 1.03s, @65 km/h
90-120 km/h: 2.7 +- 1.01s
200 meters: 8.9 +- 1.03s, @128 km/h

US Units
0 to 60 mph: 5.5 +- 1.06s
1/4 mile: 16.6 +- 1.03s, @40 mph
60-90 mph:
660 feet: 8.9 +- 1.03s, @80 mph

Time(s) km/h m
0.00 0.0 0.0
0.51 7.0 1.0
1.00 17.0 3.3
1.51 27.0 7.1
2.00 37.0 12.2
2.54 49.0 19.5
3.06 58.0 27.8
3.56 67.0 37.3
4.08 74.0 48.0
4.58 81.0 59.0
5.10 88.0 71.8
5.59 94.0 84.7
6.14 101.0 100.0

Sunday,24,January,2010,15:00:25:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G04 0003

Metric units
0 to 100 km/h: 6.1 +- 1.01s
400m: 23.5 +- 1.02s, @30 km/h
90-120 km/h: 2.9 +- 1.01s
200 meters: 9.2 +- 1.01s, @119 km/h

US Units
0 to 60 mph: 5.8 +- 1.03s
1/4 mile: 23.8 +- 1.02s, @19 mph
60-90 mph:
660 feet: 9.2 +- 1.01s, @74 mph

Time(s) km/h m
0.00 0.0 0.0
0.50 5.0 0.7
1.00 15.0 2.8
1.52 25.0 6.4
2.04 35.0 11.5
2.55 45.0 17.9
3.07 55.0 25.7
3.58 63.0 34.6
4.08 71.0 44.5
4.61 78.0 55.9
5.12 85.0 68.0
5.63 91.0 80.9
6.15 98.0 95.2
6.66 104.0 110.0

Sunday,24,January,2010,15:03:11:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G04 0003

Metric units
0 to 100 km/h: 6.1 +- 1.02s
400m: 24.4 +- 1.01s, @45 km/h
90-120 km/h:
200 meters: 10.1 +- 1.02s, @76 km/h

US Units
0 to 60 mph: 5.8 +- 1.02s
1/4 mile: 24.5 +- 1.01s, @28 mph
60-90 mph:
660 feet: 10.1 +- 1.02s, @47 mph

Time(s) km/h m
0.00 0.0 0.0
0.51 3.0 0.4
1.03 14.0 2.4
1.55 24.0 5.9
2.06 34.0 10.7
2.58 45.0 17.2
3.07 54.0 24.6
3.59 63.0 33.7
4.10 71.0 43.8
4.63 78.0 55.2
5.15 85.0 67.5
5.66 91.0 80.5
6.17 98.0 94.3
6.68 104.0 109.1

Sunday,24,January,2010,15:07:14:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G04 0003

Metric units
0 to 100 km/h: 6.1 +- 0.67s
400m: 22.7 +- 0.67s, @41 km/h
90-120 km/h:
200 meters: 9.4 +- 0.66s, @109 km/h

US Units
0 to 60 mph: 5.8 +- 0.66s
1/4 mile: 22.9 +- 0.68s, @26 mph
60-90 mph:
660 feet: 9.4 +- 0.66s, @65 mph

Time(s) km/h m
0.00 0.0 0.0
0.33 5.0 0.5
0.68 12.0 1.6
1.02 18.0 3.3
1.37 24.0 5.7
1.71 31.0 8.6
2.06 38.0 12.2
2.40 45.0 16.5
2.74 51.0 21.4
3.08 57.0 26.8
3.43 62.0 32.8
3.77 68.0 39.1
4.12 73.0 46.3
4.46 77.0 53.6
4.81 82.0 61.5
5.16 86.0 69.8
5.49 90.0 78.1
5.84 94.0 87.2
6.17 99.0 96.4
6.51 103.0 106.0

Sunday,24,January,2010,15:08:32:28960
Control Module Part Number: 4D1 907 558 D Component and/or Version: 4.2l V8/5VT G04 0003

Metric units
0 to 100 km/h: 6.2 +- 0.69s
400m: 25.3 +- 0.69s, @31 km/h
90-120 km/h:
200 meters: 9.8 +- 0.69s, @87 km/h

US Units
0 to 60 mph: 5.9 +- 0.68s
1/4 mile: 25.5 +- 0.66s, @20 mph
60-90 mph:
660 feet: 9.8 +- 0.69s, @54 mph

Time(s) km/h m
0.00 0.0 0.0
0.34 1.0 0.1
0.67 8.0 0.8
1.01 15.0 2.2
1.34 21.0 4.2
1.67 28.0 6.7
2.02 35.0 10.1
2.37 42.0 14.2
2.71 48.0 18.8
3.05 55.0 23.9
3.39 61.0 29.8
3.74 66.0 36.1
4.08 71.0 42.8
4.42 76.0 50.0
4.76 80.0 57.7
5.11 85.0 65.8
5.45 89.0 74.2
5.78 93.0 82.9
6.13 97.0 92.1
6.48 101.0 101.9

dmross

January 26th, 2010, 18:03

The time difference to pressurize the OEM vs. aftermarket intercoolers is not a factor, because it is in the realm of microseconds.

A leak in the intercooler is a different story, because you are leaking metered air which would result in the car running rich, potentially robbing you of power.

Shoppinit

January 26th, 2010, 18:17

I thought the air was metered after the turbos / IC ?

EDIT: Sorry, I'm talking rubbish. You're quite right.

Shoppinit

January 26th, 2010, 18:27

This is actually quite a complex problem because even if you are making full power, it doesn't mean that your performance is there. It's when you make full power and what happens up the rpm curve that is important.

This is my thinking, and if I'm wrong then please let me know:

1. You control the amount of power request via the accelerator pedal
2. The car opens the throttle to achieve requested power
3. The MAF measures the amount of air being sucked / blown into the engine
4. The ECU uses the MAF value to fuel the engine. It corrects natural variation in MAFs with the O2 sensor information and adjusts the fueling.
5. Ignition is advanced / retarded to get max efficiency without pinking / knocking

Does this sound right?

RS6-4dr911

January 27th, 2010, 03:25

Shoppinit

January 27th, 2010, 08:49

Thanks. So would a dodgy MAF would cause the O2 correction to go out of bounds and throw a DTC, right? So if lambda values are sensible, then the MAF must be OK?

dmross

January 27th, 2010, 15:43

Thanks. So would a dodgy MAF would cause the O2 correction to go out of bounds and throw a DTC, right? So if lambda values are sensible, then the MAF must be OK?

A MAF that isn't reading accurately is one of many things that could cause this. The O2 sensor itself could be failing, or as you could have a hotside leak somewhere (intercooler, piping, intake manifold), etc.

An easy way to determine if the MAF is ok is to check that both are reading in a similar range. Although it's not a perfect test, chances are they aren't both bad, so if one is off significantly, it might indicate a problem with the MAF or the intake plumbing on that side.

You bring up an interesting point regarding "sensible" lambda values. The correction can actually vary quite a bit depending on the type of fuel used. Additionally, a relatively new problem that is often overlooked is the increased used of ethanol in pump fuel. This is especially noticeable on a finely tuned car. It can throw target AFRs off significantly. ECUs that learn long term fuel trims can get confused as well, especially if you fill up at different gas stations with varying ethanol content. I always try to stick with the same gas station if possible when troubleshooting, it's just one more variable that can throw off testing. :vhmmm:

RS6-4dr911

January 27th, 2010, 19:38

An easy way to determine if the MAF is ok is to check that both are reading in a similar range. Although it's not a perfect test, chances are they aren't both bad, so if one is off significantly, it might indicate a problem with the MAF or the intake plumbing on that side.

And that's the $64 question - what is a "similar range"? 5%? 10%? 20% As an average throughout the rpm range? At any point?

My variation is quite large (as much as 25%) at low RPM's but narrows to 10% +/-2% at WOT and 3500rpm and up. So what say you to that?

Shoppinit

January 27th, 2010, 19:44

Mine too. But I think that both would degrade at the same rate. The MAF is a hot wire and any contaminents will burn onto it, reducing their effeciency, theoretically at the same rate. (this is why oiled air filters are a big no-no).

The BMW fraternity seem to like cleaning theirs. Interesting thread I came across:

http://forum.e46fanatics.com/showthread.php?t=335561

p3u

January 27th, 2010, 20:02

Shoppinit

January 27th, 2010, 20:29

Can't get the CRC MAF cleaner where I live. I also kinda agree with the 3rd post on this thread:

http://tinyurl.com/ygm3vdb

batty

January 29th, 2010, 18:41

RS6-4dr911

January 29th, 2010, 19:04

vagcom has quite a slow sampling rate.
do the MAF readings show a different time stamp, hence showing a different MAF reading from side-to-side, as vagcom records different poits on the airflow vs time curve ??

Are you Paul_23 on RS246? same question raised there. If not:

Correct it does not log all data at the exact same time, but if you look at the raw data, reading across the columns, each you time you hit a "Time Stamp" column, everything to the right of that was taken at the same time until you hit another "Time Stamp" column. To my knowledge, all left/right bank data (MAF, Lambda, others) is logged at the same time, so for the variation between MAF's this is not a concern. Even if there are data that are logged at different stamps, the intervals are the same and it is pretty accurate to interpolate linearly between the readings and graph data with adjusted values to eliminate this problem. I've done it with transmission data trying to determine slippage where, IIRC, shaft RPM's and engine RPM's and Vehicle speed were logged at different times. Interpolation made for a much closer correlation between the data, showing that the box was sound.

Shoppinit

January 30th, 2010, 21:48

There's a turbo button so that samples are taken every 0.1 secs. I always try to log in turbo mode if I can.

RS6-4dr911

January 30th, 2010, 21:56

Maybe I'm missing another file. Mine's always grayed out and says something like "will not work with this interface", which is a USB cable that they recommend for that year of car.

Shoppinit

January 30th, 2010, 22:11

if you look at the raw data, reading across the columns, each you time you hit a "Time Stamp" column, everything to the right of that was taken at the same time until you hit another "Time Stamp" column.
This is my understanding also. All the data in one measuring block can be assumed to be simultaneously measured. The same is not true from one measuring block to another, as is shown by the different time stamp.

RS6-4dr911

February 5th, 2010, 05:35

Replaced MAF's, top seals and N75 today. Variance between the two banks narrowed by roughly 40%, average flow reading increased by almost 7%.

Butt dyno says snappier off the line, waiting for dry weather to clock 0-60 to verify.

http://i843.photobucket.com/albums/zz356/blatham489/MAFReplacementcomparison.jpg

DHall1

February 5th, 2010, 06:44

Big change.

Looking better

Replaced MAF's, top seals and N75 today. Variance between the two banks narrowed by roughly 40%, average flow reading increased by almost 7%.

Butt dyno says snappier off the line, waiting for dry weather to clock 0-60 to verify.

http://i843.photobucket.com/albums/zz356/blatham489/MAFReplacementcomparison.jpg

Shoppinit

February 5th, 2010, 08:23

Is before 1 and before 2 the 2 different banks? Or 2 different runs?

RS6-4dr911

February 5th, 2010, 14:25

I should have been more clear. Numbers shown on the graph are the absolute values of the percent difference between the banks, 1 and 2 are different runs.

Shoppinit

February 5th, 2010, 15:18

You should work in the dept of treasury ;)

Shoppinit

February 5th, 2010, 15:25

I don't think the difference between the 2 is terribly critical, unless it's huge of course. Which in your case it kinda is. If the g/s reading is proportional to the actual amount of air flowing in then the lambda correction should do its job. Which brings me to what I'm having an issue with.

Measuring block one shows lambda control. Which goes to ZERO under WOT - we have seen this. So:

1. What determines WOT? We've seen that it's not throttle valve angle (at least not only this), there must be other factors.
2. What about the multiplicative lambda values? These are learned over a period of time (I'm guessing minutes). Do these still apply under WOT? I'd say yes.
3. Under part throttle, the multiplicative lambda values are in play, but also the lamdba control values in MB001. Is this a fine tune device?

Virtual beer (or chicken dinner as I suspect it might turn out to be) to he who gives a convincing answer :)

Shoppinit

February 8th, 2010, 09:13

Any progress on this? What's the verdict on the new MAFs?

RS6-4dr911

February 8th, 2010, 13:41

I haven't double checked to see if my error codes are gone, but after replacing the MAF's and N75, the car feels much better, the variance between banks is well under 10% across the range and the total MAF is reading more like what it should in total (Bank1+2).

A crude, hasty 0-60 time on VAG-COM showed 5.2, well under the mid to high 5's previously, so big improvement. Further, put it on the dyno Friday and it showed to be making right at 450hp with a smooth power curve. So, I think I've fixed it.

Not sure how convincing my answers will be but I'll try:

1. Throttle position sensor, but maybe load instead?
2. I agree, yes
3. Again yes.

Shoppinit

February 8th, 2010, 14:10

That sounds quite encouraging. I've got my new MAFs now and will install them at the same time as the N75 when I get a chance. I'll let you know (though not for a while - too busy to play :( )

JRS-RS6

February 16th, 2010, 15:25

That sounds quite encouraging. I've got my new MAFs now and will install them at the same time as the N75 when I get a chance. I'll let you know (though not for a while - too busy to play :( )

Any update on this Shoppinit?

Shoppinit

February 16th, 2010, 15:27

Still haven't had time to play. I might get a chance on Thursday. I'm not really expecting any improvement since my logs look good and I recently got full power on the rollers. Might be interesting to see what happens though. I'll be keeping the old MAFs as spares.

Are you having issues?

JRS-RS6

February 16th, 2010, 15:45

No codes but not making full power just beginning to investigate. Boost looks lower than requested as tested this morning.