Jenner

Test notes:
First time messing around. I probably heatsoaked the engine as I drove to the location, shut it off, setup the cable and laptop etc.
84* 60% humidity clear sunny day. Windows all down including sunroof fully open. Sport mode on, only mod is Tubi resonator back exhaust. Airbox flap is installed and I did the engine tests to confirm it and the intake manifold flaps are responding. ECU was reset two days ago.
I'm not sure if it is because I was logging 003 and 120 but it maxes out at 8000 even though I took it to the limiter. I did have turbo mode enabled.
FATS calc link on your website says 4.62 based on my cutting and pasting in:
16.99 4200
24.46 7920
Max MAF reading was 2x 151.33 g/s @ 7920rpm but I have a feeling it might have been higher since I see nothing above 8000 on the log.
If I use ECUxPlot I get a proper looking "dyno" plot, but the numbers for crank and wheel hp are way too high even if I enter in the correct temp/humidity/altitude for SAE correction.
I also uploaded a test file to your website but it's spitting back an error. Thanks guys.

silverRS4

This is with Vag-com, right? Why mess with FATS? In Engine Module One (the primary engine module) using Advanced Measuring blocks, you can log Engine Torque Actual in N-m. Its Group 120 Field 2, so its way down near the end of the list for Advanced Measuring Blocks. If you log this, and engine RPM in turbo mode (for more data points) you will be able to plot a very accurate torque curve. It should peak at around 425 N-m at around 5600-5800 RPM if you are at sea level. How does the ECM "know" how much torque the engine is making? I presume its a function of engine load, which the ECM also knows and can also be logged. I am sure the Audi engineers know for any particular engine they make, that if they know the load (in %), they can tell you the torque output at that moment. Additionally, lets say you are at a elevation where your Altitude Adjustment is -4.0% (this is also in Adv. Measuring blocks). It will follow that your load will not peak above 96% (100 minus 4%) and the engine torque will be rougly 96% of 425 N-m. This is the pattern I've seen anyway.

Jenner

I did log 120 as well. The dyno chart it produces is VERY rough.

Where did you get 425nm from? The highest I saw was 391nm at 3680 RPM

The other figures I pulled out were 355hp at 7920 RPM and 288 ft/lbs 3680 RPM

Jenner

Thanks for the tip on editing titsataki.

BTW I think you are really close by. Are you in the New Hay Hay area?

silverRS4

For a smoother plot, log only RPM and torque in turbo mode.

Advertised torque peak is 430 N-m, which equates to 317 ft-lb. There is a torque/power versus RPM plot in the European RS4 brochure that’s in kW and N-m. It shows the characteristic power “bump” at 5500-6000 RPM along with a peak torque in that area of around 430 N-m. My plots of Vag-com engine torque have peaked at 428 N-m (even considering my altitude) and will look exactly like or even better than the advertised curve. I’ve spent quite a lot of time logging and plotting because my car exhibits two completely different personalities – and it’s really pi**ing me off. With the same fuel from the same gas station and roughly the same atmospheric conditions and all 3rd gear pulls my car will either A) exhibit the awesome power increase at 5500 rpm and peak at 425-430 N-m, while engine load will peak at 94-95% and the car will do 110-111 mph in the quarter or B) Does not exhibit the torque increase at 5500 RPM, the torque peaks and flatlines at about 390 N-m from 3500-6000 and then drops off, while the engine load peaks at 88-89% and the car does 106-107 mph in the quarter. This is easily a 30 HP difference and is very easy to detect when the car is driven. The mass-air flow, timing and timing retardation are similar in both cases. All of my flaps work fine, there are no vacuum leaks or CEL’s. It’s either A or B and the last month or so it's been only B. I've planned on telling my dealer, but without a CEL, I don't think they'll do anything. This car appears to be very particular about something...

Jenner

I know EXACTLY what you are talking about with the Jekyll and Hyde personalities. You are not alone. With the Tubi exhaust I can tell what "mood" she is in just based on the exhaust note.

titsataki

post and request it in this thread.

https://www.audiworld.com/forums/sho....php?t=2748703

Kris will give the privilege.

Cheers

Nick

silverRS4

I've been trying to pin point something in all the logs I've done but I haven't. At first I thought it was fuel and ignition timing related. As if the knock sensors were sensing detonation and retarding timing when it didn't need to be (a loose bolt vibrating near one of the 4 knock sensors). But I have logs where the engine was making over 425 N-m and the retardation was 7-8 degrees. I also have logs where the engine couldn't get above 388 N-m, but the retardation was only 2-3 degrees. It doesn't seem to be mass air flow related either. I typically log 155-160 g/sec at 7800 rpm no matter what mood the car is in. I did log some interesting things today because the car is running poorly just like it did before I had all 8 injectors replaced. I have a few ideas and I will be taking the car in for its 15k service next week. Hopefully some light gets shed.