Originally posted by Sneakin Deacon
running too light a flywheel makes taking off very difficult, less weight means less force to slow down (and vice versa). billy's wrx for example, had a lightened flywheel, and he had trouble launching because the car would bog, went back to his stocker and it is fine and dandy. my advice is find a happy medium, tried and true things...ive driven a del sol with an act 6 puck clutch and heavy PP, with some insanely light flywheel (wanna say 6lbs) and it was either feather the clutch, which was hard to do period, or raise the rpms some more and feather it a little less. but like i said, its something your going to have to feel out.
+1 with a lighter fly wheel you have to launch at a higher RPM. i've heard a stock flywheel will get you out of the hole faster, but a lightened fly will help you in the upper RPMS. on the launch that heavier rotational mass(stock fly) is going to put more power to the ground.