If I drive normally/slowly for a little bit,and then I start to drive aggresively my engine becomes very strange.

If I hold the engine rpm between 2000 and 3000,with the throttle at a constant level,I can hear the turbo,and it sounds like it is constantly sucking a huge amount of air(it makes a ssssssss sound).Now,if I pinch the throttle,the car goes insane.The turbo lag completely dissapears,and the acceleration is just instant.It's like the car went into a sport mode or something.I have manual gearbox.Am I the only one with this "problem"?I saw that if I turn off the ESP,this "sport mode" engages faster,only after a few hard accelerations.

Not had this on mine, just a drone between 2000 and 2800 rpm that is getting worse the older the car gets. Didn't realise the ESP did that, I will give it a go tomorrow, maybe that noise is better than the drone.

Doesn`t do it on our DSG equipped one, but you can hear the turbo now as it`s just been fitted with an S4 / V6 style backbox - looks awesome and sounds really nice for a diesel.

Whats an S4/V6 backbox?

Whats an S4/V6 backbox?

The latest Audi S4 has a V6 supercharged engine

As compared to the previous models V8....

I assume he has the backbox from the exhaust of the V6

Nope ours has a custom made exhaust, I meant it has twin pipes on either side (like the V6 or the Audi S4) just a slightly bigger pipe, sounds great! Starts up and you get a nice grumbly barp and it actually manages to make ours sound pretty meaty too!

I guess I just found the answer :'(

Address 01: Engine

Control Module Part Number: 03L 906 022 AN

1 Fault Found:

009571 - Turbocharger Boost Control Position Sensor Circuit: Implausible Signal

P2563 - 000 - -

Freeze Frame:

Fault Status: 01100000

Fault Priority: 2

Fault Frequency: 1

Mileage: 72632 km

Time Indication: 0

Date: 2019.14.26

Time: 22:27:34

Freeze Frame:

RPM: 897 /min

Speed: 52.0 km/h

Voltage: 14.14 V

Lambda: 44.2 %

Lambda: -3.9 %

Bin. Bits: 00001110

Voltage: 2.660 V

Last night the Malfunction Indicator Light(MIL) lit up with this message : Engine Fault!Workshop!.

I guess the problem was that this Turbocharger Boost Control Position Sensor(G500) was problematic even before I got this fault code,so the actuator became stuck from time to time and I had boost all the time.

Ooops, that sounds quite expensive!

Indeed...it looks like the turbo must be changed.My dealer is waiting for warranty approval.I guess the sensor can't be changed,it only comes with a new turbo.