reduced or stop acceleration around 6000 rpm

[justincredible]

So I have seen this posted a few times and I actually experienced this just recently with a friend in his V10 powered Audi. From what I have seen this is actually a common issue. To the 5.2 V10 cars.

They all seem to have this same issue

2008 Audi S6
Variants experienced: BOTH
79k miles, been happening since I bought it with 53k

Another observation, possibly related:
Sometimes, the car will stop accelerating at 6k RPM almost exactly in second gear after accelerating from a stop. First gear will go all the way to the redline, I’ll shift, second gear will get to 6k rpm, and the car will decide to take a nap. It doesn’t always happen, and I’ve had other issues I’ve been trying to resolve so I don’t have all the data that I need on it yet.

I don’t use Sport Mode, but I definitely noticed it more when I did, but I had just purchased the car at that point so I’m not sure if it happened more frequently or the same in sport mode, although if I had to guess, I’d definitely say it happened more in Sport Mode for me.

I experienced this the other day with a friend. But I have read read about this happening before to a few other people. In the case the 6000 laydown the car I was in did this in 1st gear 2nd gear and 3rd gear. But only on hard acceleration off a stop.

So my question is how many other people does this happen to.

Most of the time from what I have seen If you accelerate hard off the line the car will get into the upper range past 5500 and then the car will start to feel like your backing off the accelerator pedal for several RPM and then the car will slowly start acceleration again. Other timeis it will feel like the car is chugging in that rev range.

Im going to do more logging this week but the thoughts i have read some think this might be the intake switching over as that will cause a block in air flow. I think this might be part of it but it looks like it might be bigger then that.

I would think if everyone tried this that it might be shown this is a constant thing with all the cars.

[illumiNateV10]

Good lookin’ out on posting this.

I have a vagcom but no idea how to use it. If you want me to run some test scenarios, let me know what they are, and how to log them with vagcom, and I’ll help you out.

[c.scott]

Never experienced anything like this before, in normal, sport, or manual mode… shifts have always seemed a little sluggish in any gear, but pretty sure that’s unrelated. In my case, it’s definitely just the trans taking a nap, not the motor.

[aluthman]

Possible timing pull due to heat soak perhaps? I’ve heard these cars run extremely hot. It makes sense to me that the car would go to redline in the first gear and then by the upper range in 2nd and 3rd it would be heatsoaked to the point of pulling timing. If the ECU behaves like the MED9 in my A4, it will pull timing as soon as it detects a knock event and won’t advance it for a bit until it thinks it’s safe. If it detects another knock event, it pulls more timing. If it thinks the coast is clear, it will then slowly advance timing again. This seems to fit the description of what happened. I would log timing pull, IAT, and coolant temp to check all this.