[Bigger is Better]

[QUOTE=J.C.you]i remember seeing a steel/alum flywheel dyno and track comparision years ago in one of the mags. believe i recall correctly, there was a small inertia spike with the steel, in the literature they posted. But, not enough tho, to overcome the alum weight advantage.QUOTE]

I think this is the article you are talking about: http://www.popularhotrodding.com/tec...ase/index.html

It has some good theory and testing in there.

I use a alum flywheel on my autocross/hillclimb TA and I dont have any issues on the street with it.