The flywheel clutch can't take it! REALLY!
On my 2002 S3: I had a Custom Code re-map which was ok for a time (1000 miles), but then clutch slip appeared and then got worse, and worse and then much worse, slipping in 4th, even under light load.
I had Audi Stafford do a clutch swap. The objective assessment of the original 60,000 mile clutch plate was that the clutch friction plate and flywheel was ok, and I had to agree, no problem at all with the plate and/or flywheel. The characteristics of the re-map were the issue.
I had a NEW clutch fitted and sold the S3. I wanted fault-free acceleration.
So Iâve purchased an RS3; this has a suitably designed drive-train and the problem has gone.
ANSWER: buy a car designed to provide the acceleration youâre after. Modifying, in the long run, is money wasted.