Ceramic cluth flywheel

Hi friends,
i am using a DIY ceramic clutch assembly with original modified flywheel and stock pressure plate on one engine. (Its not Z22 or derivate, :) forgive for a other engine) but i want to make my own flywheel. I hope someone here already had done this kind of mod.
Now the question is what type of steel/alloy should i use for the flywheel for use with ceramic clutch discs? Any advice?
 
Top