Originally Posted by MichaelMarsal
I would use s6. I have driven a few m3's with DCT (granted the one i havedone the most laps in has 20 inch wheels on it which can affect the grip) but I Felt the downshifts were spot on in s6 mode. I would not think that the "more jerky" nature of the higher settings would affect the stability of the car on entry into a corner. The same goes for track out.
I find anything below S5 too lazy for track use. In S6 the downshifts are just perfectly crisp IMO. I also discovered that DCT is quite smart as it does a butter smooth shift if the car is under lateral load, regardless of the setting. This is perfect to be able to upshift while cornering and not upset the car. Impressive technology