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peiserg
June 13th, 2007, 23:05
I logged the following data in my RS6.

Someone please interpret the data... i've never datalogged before. What it looks like to me, is that I am making about 1500-1600mbars of boost pressure. my questions are as follows... why do i have two columns of absolute pressure? is one "requested" and one "actual" boost? or is each column from a separate turbo?

also, what is meant by "load" column.

thanks.

ahh i see it didn't copy so well. the first column is TIME, 2nd is RPM, 3rd is LOAD %, 4th is ABSOLUTE PRES (mbars) and 5th is ABSOLUTE PRES (mbars)





Group A: '115 Group B:
RPM Load Absolute Pres. Absolute Pres.
TIME TIME
Marker STAMP /min % mbar mbar STAMP
0.12 3440 24.8 960 1010
0.29 3440 28.6 1460 990
0.46 3440 61.7 1480 980
0.63 3560 72.2 1480 1120
0.81 3960 82.7 1480 1270
0.98 4800 96.2 1550 1430
1.16 5520 106.8 1560 1480
1.32 5600 109.8 1550 1510
1.5 5680 106 1540 1440
1.67 5840 100.8 1550 1360
1.84 5920 98.5 1530 1370
2.02 6040 103.8 1530 1430
2.19 6120 107.5 1540 1480
2.35 6240 109 1550 1540
2.53 6360 109.8 1540 1570
2.7 6440 109 1550 1570
2.88 6480 107.5 1540 1570
3.05 6160 112 1550 1550
3.24 5480 117.3 1580 1520
3.41 4760 111.3 1540 1530
3.58 4840 108.3 1530 1500
3.75 4880 106.8 1520 1470
3.91 4920 109 1530 1480
4.09 5000 111.3 1520 1530
4.26 5040 115 1520 1560
4.43 5080 115.8 1530 1590
4.61 5120 115 1530 1590
4.78 5160 114.3 1540 1570
4.95 5200 114.3 1540 1530
5.12 5280 112.8 1560 1510
5.3 5320 112.8 1560 1540
5.47 5360 114.3 1570 1550
5.63 5400 115 1570 1560
5.81 5440 115.8 1580 1580
5.99 5480 117.3 1590 1590
6.15 5560 117.3 1600 1590
6.33 5600 116.5 1610 1600
6.5 5640 117.3 1610 1600
6.68 5720 116.5 1610 1610
6.85 5760 116.5 1590 1630
7.02 5800 118.8 1590 1640
7.19 5840 118 1590 1640
7.36 5920 116.5 1590 1630
7.53 5960 115.8 1590 1620
7.7 6000 113.5 1570 1620
7.88 6040 113.5 1570 1610
8.05 6080 113.5 1570 1600
8.24 6160 111.3 1570 1580
8.4 6160 109.8 1550 1580
8.58 6240 109.8 1550 1570
8.74 6280 109 1550 1570
8.91 6320 109 1530 1550
9.09 6360 107.5 1530 1560
9.26 6400 107.5 1540 1540
42TT
June 14th, 2007, 02:29
Well you need to log in 3rd gear and at WOT (wide open throttle) best way is to have the car in tip mode 3rd gear and push the accelerator all the way down just before the kickdown switch and hold it there so it pulls through 3rd gear without changing down a gear.

1500-1600mbar is within specification.

42TT
skiwi
June 14th, 2007, 08:26
42tt is correct - except use 2nd gear as that is more legal most places. expect "requested" and "supplied" to be within a few % most of the time, particulalry at reasonable rpms less than 20mbar is normal. 1.5 to 1.8 bar is ok at high rpms..
O.CT USA
June 14th, 2007, 14:01
Just FYI mbar-1000 = bar.
peiserg
June 14th, 2007, 16:37
ok so then I'm looking at "requested" and "actual" boost then?

But my impression was that 1800 Mb was "stock" boost for an rs6? I'm only at 8+ psi in that run..

oh that was 3rd gear btw.

and the dyno run I had, where i logged boost, showed 8+ psi across the board... 3000-6500 rpm. my impression is that is low? incorrect?
Avus-RS6
June 14th, 2007, 17:38
ok so then I'm looking at "requested" and "actual" boost then?

But my impression was that 1800 Mb was "stock" boost for an rs6? I'm only at 8+ psi in that run..

oh that was 3rd gear btw.

and the dyno run I had, where i logged boost, showed 8+ psi across the board... 3000-6500 rpm. my impression is that is low? incorrect?

You're making almost 9psi. RS6 requests load, not boost. Max boost for stock is 8psi, about 1540mbar, and this is not achieved all of the time as the ECU requests load, and boost is only requested to achieve the desired load. Your load is well over 100%, indicating you're chipped. Boost is higher than stock as well. Did you happen to do any pulls when you were stock?
skiwi
June 14th, 2007, 20:59
getting over 100% load is normal for a standard car. generally you would expect this whenever you have a wot and lower revs...
peiserg
June 14th, 2007, 21:46
thanks for the info so far guys.

Now wait a second. I was told, several times, IIRC, that 1800 mb (11.75 psi) is normal for stock.

here's the link. http://rs6.com/forum/showthread.php?t=12179 here's another http://forums.audiworld.com/rs6/msgs/34770.phtml

So 1500+ is actually normal? I was actually getting ready to tqake the car into Audi with the complaint of "down on boost---only making 1500 instead of 1800"

Car is chipped. APR. but that run was done on the stock setting. Actually have just returned the APR chip for some issues with power and Check engine lights. They didn't disagree, just said to send them the ecu and they'll return to stock, so no complaints there.

so, if a car is putting out 8+ psi in stock setting, and 12ish on the higher setting, what reason you think for getting minimal power gains? I only picked up 20 awhp for about 1500 rpm, despite boost being 4 psi higher across the entire rpm range.

thanks all. my plan now is to return to stock, run at stock for a while make sure my check engine lights don't come back, then go to either AWE or OCT, since OCT has been helpful with my issues.
O.CT USA
June 15th, 2007, 04:16
ok so then I'm looking at "requested" and "actual" boost then?

But my impression was that 1800 Mb was "stock" boost for an rs6? I'm only at 8+ psi in that run..

oh that was 3rd gear btw.

and the dyno run I had, where i logged boost, showed 8+ psi across the board... 3000-6500 rpm. my impression is that is low? incorrect?

Dyno runs can be a little bit different. The most important thing is the cooling. I have seen dynos with insufficient cooling making a loss up to 10g/s on the MAF side compared to a log taken from road.
peiserg
June 15th, 2007, 04:52
just to clarify...

on the DYNO run, i logged 8+ psi across the board. put down 332 awhp.

It is my ROAD run in 3rd and 4th gear that I posted up here. Now, the day was probably about 98-100 degrees farenheit when i did the run, if that matters.

I am not familiar with wha the MAF really does.

All I'm really asking, I guess, is do I need to take the car into Audi for a checkup because I'm at 1500-1600 mb at WOT in a street run. I'm unsure because of the conflicting info I've gotten regarding what is "normal" boost levels.

as an aside, I'd love to know how it is my boost level is bumped 4 psi across the board with only minimal power gains.