silverd2

I'm pretty sure that Euro codes always end in "1", as opposed to equivalent US codes always ending with "2".

US S8 sport coding is 01032. Your code of 01031 should be the same...including the ability to down shift to 1st gear at will...and 1st gear holding to redline or you shifting. As I understand it, your car is not supposed to accept any code ending with "2". So 01031 should be what you're looking for...the sportiest mode possible for your car and it's TCM.

"Sport Mode" is something different...it is a notch in the shifter below "D" on 2002 and later S8 & A8 (US models), that replaced "4,3,2"...basically a 4th gear setting that uses a MUCH more aggressive shift mode (1st thru 4th gear) than even "sport coding". That option requires a different TCM...the one that came with cars equipped with the shifter with "S" only below "D".

Your redline likely has nothing to do with the trans or it's coding. That an engine management decision (ECM).

Serlock

As for 97 4.2q A8 when i coded it to sport. It then downshifted from 5 to 2 gear when i depressed pedal about 50%. Before it was 5 to 3 when i pressed it to the floor.

So for S8 it should be i think something similar. However now im happy the way car works as i am able to explore full potential with tip mode. Of course would be nice to have 1st gear when i want to. Not when its not more 3k rpm.

So i guess, ill keep looking for 02 or 03 TCU. Until then - its pretty nice now. Thanks a lot for that code guys!

Serlock

Continung to play, it DID allow me to change also to:

01001
01011
01021

But none of these were sport mode.
Some came back to "tip will shift itself at 6700"

'01-S8

So are you saying in a 2001 if its in 4th gear setting it gives a more aggressive shift map then when in D?

Or are you saying the "S" is where 4th selection WOULD be and that has aggressive shift map in a 2002 and later.

But then you say 4th is even more aggressive than the Sport coding? And using a different TCM? I want to do this and have the VAG software and cable, just want to see what my options are.

Thanks

S8ilver

So can 2002 US S8 run at 7500 with no issues I wonder?...can the stock "D" mode be recoded for when in tip??? I redline at 7000 and it "feels" like there could be more. I see 0-60 specs of 5.9s & 6.3s depending on the source. However that could just mean 0-60mph of 5.9s and 0-100kph of 6.3s, which sounds resonable...0.4 for that extra 2.5mph perhaps.

I'm just curious what allows non US S8 to run @7500rpm. If ECM and not TCM, anyone tried recoding for 7500rpm?

silverd2

To get true sport MODE, you have to use a 2002 and later TCM. If you had that TCM, then 4th gear slot would trigger sport mode, which is much more aggressive than any normal sport CODING. Sport coding is just a small change in shift points, barely detectable in my opinion, unless you use the code ending in "32" (01032 for S8..00032 for A8) that includes total control of 1st gear in tip mode.

Coding >>
http://www.audipages.com/Tech_Articl...nsmission.html

silverd2

I thought that US and Euro S8's were the same specs and have never seen any Audi info that says anything about a 7500 rpm redline....I dunno(?).

Bentley has conflicting info on the actual redlines of A8's and S8's. In one section they say 6200 for A8 and 7000 for S8. But my A8 is marked and easily reaches 6400 and the actual speed in each gear matches that (considering the gear ratio).

At 6200 rpm in 2nd gear, I'm supposed to be at 75mph, but my car easily hits 80mph at 6400...2.909:1 final drive for A8.

Thanks to a 3.730:1 final drive (and same trans ratios as A8), an S8 should hit exactly 66mph at 7000 rpms in 2nd gear.

In another section of Bentley it says S8 reline is 7200 and A8 is 6600...Euro and US? ...I dunno...it doesn't specify.

The main difference for top rpm (mechanically) from A to S is higher maximum flow for S8 injectors (different part #) and cam lift and duration more suited to higher rpm in S8 engine.

The rev limiter in the S8 is by means of electronically (from ECM) shutting down the throttle valve. In the A8 the ECM cuts off the fuel injectors.

I have no idea if would be "safe" to go beyond 7000 (or 7200?) in the S8. And don't know if it could be coded to ignore the redline...never seen it discussed.

I've read about others eliminating the North America SPEED limiter (130mph for A8 and 155 for S8), but not through VagCom coding...but instead using a program or software called Lemmiwinks....no personal knowledge, though...or if can do anything with rev limit.

Serlock

Guys, there is something wrong with my car. I tried maybe 10 times to see 0-60 time. and it is around 7.5 sec. its very slow. It feels like its having a hard time reaching high revs. On youtube i see guys are reving much quicker on acceleration. Also when IDLE the engine is little vibrating. I changed spark plugs to original bosch platinum. Nothing changed. Coils are fine. Dont know what else to check. Engine does not give any errors on VAG. I posted my acceleration on youtube. Check it out:

http://www.youtube.com/watch?v=oteGv...ature=youtu.be

silverd2

More than likely, whatever is keeping you from reaching redline is obviously slowing your acceleration time. That's all I could get from that horrible attempt (sorry) at a 0-60 video. The video started when speedo was already rising and it was bounced out of view when you were hitting 96.5 kph (60mph)...looks like you ran over a couple of speed bumps or animals

Anyway, with no codes, I'd start with a basic check of the toothed belt timing...it can be off enough to adversely effect power and not throw a code. Bad injectors "should" eventually throw a misfire code, esp at high rpms.

Serlock

Thanks for advice!! Next week, ill be chaning timing belt. Welll see then. This video was edited with editor, it starts exactly when car is starting.