Got a Revo Stage 1 on my Audi S3 (2002) BAM, sometimes I have noticed when accelerating from stand still up to 2000 revs (not thrashing it) before changing gear, thereâs an intermitted sudden kick, like a surge of power even though the turbo isnât fully spooled up. My MPG drops to around 8.0mpg (like this morning), which to me is not correct. Once the car is fully warmed up, it seems normal â i.e. on boost it drops to around 17mpg. Anyone have any clues as to what could possibly be the cause of this?