yeah, that’s why I said to clear codes, cycle the car, then recheck at the top of this page
Ok I made some measurements to illustrate were I’m heading so you can figure out if stuff has been changed or not:
Unfortunately I don’t have a S4 here at the moment but the principle is the same.
This is how knock voltage usually looks when you do a pull from 1000-4000 with ~300-400 MAF. Sensor Voltage is ~0.5 @1000RPM and ~ 0.75 @4000RPM.
http://img703.imageshack.us/img703/5436/orit.jpg
Why 300-400 MAF to analyse engine noise? Because you have sufficient load on the engine but you are outside the area were you can get knock. Best is also to delete the failure memory before doing the pull so you get adaptation values out of the way. It also helps when the pull is longer so you have more data points ( so choose the right gear ;)).
This is a pull from the same car with modifications like I think that are done in the tune.
http://img9.imageshack.us/img9/4556/modil.jpg
Knock voltage is limited to the calibrated min value till a certain RPM and a lot less from there on. Base noise limited by the min threshold is usually never the case with load >200 MAF because the calibration is not right in that area then. When you log stock cars you will most probably never see this and the level should be similar to the first pull.
This is a log from tribes car with 93 file.
http://img9.imageshack.us/img9/7572/logwt.jpg
What seems very strange is that cyl1 is like not existant noisewise till 4300RPM. Cyl6 is the only cyl that is anywere near normal noise level.
To clearly identify this you need to log some stock or supposely stock knock detection cars in the way I did and compare.
When you clear the failure memory you have to drive the car for a certain time so all diagnosis can run/pass to set readiness.
Help us understand
what’s the red line
what’s the black line
each colourful line represent each cylinder…measuring what? noise? How could revo adjust how the car reads noise?
Also it wouldn’t seem to make sense really, would it? I mean why would you ON PURPOSE want a tune that is prone to knock and go to such extents to protect that? All the 1/4 mile wins in the world aren’t going to repair your image once this gets out and once people have engine trouble. I mean if they’re developing the tune and this is a minor setback, and they’re adjusting etc. still sure. But this is their final tune. They have denied this vehemently. Seems a really odd risk to take.
When you zoom the pictures you can read the stuff more clearly.
N is engine speed (red)
MAF is load (black)
The other lines are the normalized base noise (knock sensor voltage) for every cyl.
Based on a blurry map that was posted by APR on audizine I would say that the gain for the knock sensor has been changed to reduce engine base noise. That’s excatly what I did in the example.
I have seen ME7 files from them for 2,7t and 1,8t engines that had similar modifications. In this files the threshold for detection and not the base noise was changed (can’t change base noise on Bosch / Knock detection works a bit different there).
I think this is common buisness. The everyday user won’t notice. How could you if you don’t have a real good understanding of how the software works?
Engine “tuning” is no black art and the possibilities on these engines are limited. If one is making significantly more power on the same hardware it’s always suspicious.
Like I said log and compare. It will be pretty obvious then if or if not.
tsivas… do your magic
OK Silentbob nice graphs… but let’s put it in English: How bad is it? ??? 
could be good could be bad. without a comparison to a stock car this information is virtually useless
magic? ;D lol. I’m a newb Rich.
What I can do is log Pete’s car in supposed “stock mode” for one.
Another thing I can do is log our setup to compare things.
Finally, I have a GIAC stage 1 b8 S4 that will be coming for some vbox stuff… I can probably log his also.
Hopefully we can see something from these files.
Getting a bone stock S4… It’s gonna be hard. I really don’t know any. I have been a very bad influence on everyone that has a stock one around me. No one is stock anymore. I will try and ask around. You think a dealer will let me take a bone stock one out and do some vag logs on the test drive? LOLOL.
An APR tune in stock should be good since Arin started the knock sensor war I don’t think they are doing it…
good idea. will do my car tonight. just fill me in on the parameters silentbob wanted.
that sounds like the results would be tainted, id hold off for a stocker
?? not following.
wouldn’t APR’s stock mode, given they have come out and said they don’t mess with knock detection, offer some insight?
I will still log a few setups. Curious to see if GIAC doing anything also.
I don’t have stock setup available to me yet.
MAF - N - and all 6 knock control voltage; in my VCDS they are blocks 397 398 399 400 401 402 but they might change in yours…
He also asked me “MAF constant ~300 mg/stk from idle speed to highest possible RPM in second or third gear” I found one MAF block that measured in mg/stk but the value was 0.00000 and I didn’t know how to set it at 300. Maybe you’ll know.
Good luck!
About GIAC I would like SB’s opinion; I’ve read one of his posts where he hints that they might be doing the same thing.
It would be nice to have some logs on a Giac
I will try and find that one. I am not sure I know what to do there either. Did you floor the car in gear at certain rpm to redline or just increase rpms with a semiconstant throttle pressure with gradual increase in speed til redline? I would think it’s the latter right?
I floored it in S starting in 2nd at almost idle through 3rd to redline without hitting the bottom switch on the gas. I was alone so I was stopping logging after each run so it could get separated by time of logging. They all save into the same file and it gets kinda long
are you guys joking? I can log a stock B8 at the drop of a hat. My friends are all bone stock lol.
someone tell me exactly what to log
Oh sweet! I guess follow up top what tribe had described for me.
Tsivas,
I actually dropped by and got my stock file flashed back today. Revo and KMD claims this is factory stock file so if it helps I can run by you again and we can log. Only problem is I wont be available tonight. Stuck at work.
Why did you get flashed back to stock? Oh and welcome to AR…