I'll try and keep this as short as possible.
I recently had Revo Stage 2+ and a decatted downpipe fitted to my early 2007 build week S3.
I was extremely impressed with the power and torque gains, espcially given that I was making about 8kw and 30nm more in the middle of the South African summer, easily beating my previous best dyno figures which were made during the frost of winter last year.
We all know a drop of 20 degrees celcius in ambient temps will yield much better power - so I'm eagerly awaiting the onset of the SA winter !
Alas - my clutch started slipping almost immediately after this upgrade.
(For info - she made 208kw and 425nm at the wheels - with nearly 30 degree celcius summer ambient temps outside on dishwater - being 95 unleaded pumpgas - the best SA has to offer at our pumps).
So I eventually did some research on this forum and the Leon Cupra forums and found a couple of links pointing to audi's clutch and/or flywheels potentially being defective in certain instances, with regards to oil seal leaks or warping.
After some diplomatic talking, Audi agreed the clutch on my car (it's only done 14,000km) was probably not up to scratch - so a replacement kit was ordered.
The car went in this week for 3 days for a full clutch, pressure plate and flywheel replacement.
The day before I was supposed to pick her up, the technical manager at the dealership phoned to tell me he was somewhat confused.
My chassis number and parts ordering info had seen a SACHS dual mass flywheel arrive at the dealership, but the flywheel they took off my car was made by LUK.
The tech's wanted to fit another LUK instead of the SACHS and phoned Audi SA parts to confirm if there was a mistake...
I told him that most people over in the UK were, at their own expense, upgrading to SACHS clutches on highly modded S3's with great results. I told him my theory, being that audi has changed OEM suppliers and that LUK has been replaced by SACHS.
Indeed this turned out to be true after he followed up. Apparently the heat rating on the SACHS flywheel is far superior to the LUK part. Hence he believes Audi AG has changed the part on their systems.
So it would seem that early S3's had the misfortune of getting the LUK variety.
All I can say is well done guys - the new clutch and SACHS flywheel are superb. No slipping. Easy taking. Car puts the power down instantly now - with zero slippage under heavy load in 3rd, 4th, 5th and 6th.
Honestly - it feels like a new car.
I'm chuffed !
Hope that helps anyone else experiencing similar problems.