JoePGT5S

Your shift points don't match my S8. I'm into the redline (over 7k) at each shift point on WOT.

JoePGT5S

Ooppps, just watched the youtube vid. Should have read the title of the thread :-)

Serlock

Shifting points is not a problem, i can get in tip mode 7500, but that does not make much faster

silverd2

You sure about 7500?

Audi says 7000-7200 is max for a 40V S8....."AYS" engine?

The throttle body is supposed to electronically close at 7200 max.

S8ilver

Hmm, 2nd recent thread that states 7500rpm for S8...even more curious now how to achieve that on mine. My AYS motor makes it a hair past 7000, but it's strong and "fast" (I've been driving a much faster car recently so S8 felt a bit "slow" after) all the way to redline.

Serlock

Well, guys, lemme go out, and make a good video in D mode. How it hifts on WOT, and how it works on TIP. you will see 7500.

JoePGT5S

Will be interesting to see the video. I also have the AYS engine, and I'd say a hair past 7k is a good description of the max shift point. Mind you there is probably some reasonable error on the tachometer between cars. The ECU will still have a precise input which is the important thing. I know speedometer error can be up to 10% (on some cars, not ours I think), so that degree of error would explain the observed 7.5 shift point for some.

Joe

Serlock

You were probably thinking its no possible but here you go hehe:


The engine code is AQH, first video is done in D mode full thorttle.

Second done in TIP mode. I pressed upshift at 6900, so it shifted at around 7300, i could have kept it at 7500, then sht but i would loose time, as when i press upshift it shifts after 1.5 seconds. so you know what i mean, here is 2nd video.:



Still, im able to get around 7 seconds to 100 kmh only, while my friends around 6 and less. My car has only 60k miles. and they are genuine.

Serlock

Sorry here is 2nd video, as i could not edit my previous post:

silverd2

I didn't say your engine couldn't do it...simply that Audi's info for North American AYS S8's is 7000-7200 Max.

Hard to judge exact start or exact 60mph on your vid, but my stop watch says mid-six's somewhere...near the claimed 6.3 sec for American S8's (Audi literature).

Plus (for info purposes, for those who don't know): I realize you posted the 1st 2 vids as demos of rev limit (not in gear), but I hope you know (and it makes me cringe) that, with an auto-trans, that is NOT a good thing to make a habit of. You're spinning a lot internal parts (yes, even in drive or neutral) in the trans, that were not designed for high rpms while not under load...A lot of that can do real damage or shorten it's life significantly.

Impossible to find specs for an AQH engine here on Google (not a single hit), but it is, of course, listed in my international edition ETKA catalog >>

The AQH and AYS share all the same engine components, except 1: The camshafts....which may make all the difference in redline(?). Both engines share the same injectors (higher flow than A8 Injectors), but the most common way to get higher rpms out of the same engine, without dropping over the end of the power curve, is the correct lift & duration on the cams.

Most engines have already passed the peak torque at redline, but are just reaching peak HP. If the cams weren't designed for it (and of course injectors that can provide the needed extra flow), increasing the redline on most engines can actually slow the car's acceleration, because they've gone "over the hill" on the power curve.