Im going to agree with that. I dont believe a lot of things written in those mags. If the flywheel really is the main cause of clutch failure then how come there are so many peope running ACT clutches with stock resurfaced flywheels with 0 problems. There are more running the stocker with ACTs then with the lightened... interesting right!

Ill be purchasing an ACT clutch at the end of the summer when funds are available but I will be using the stock flywheel resurfaced... however, if ACT would come out with a damn chromoly one that'd be a nice alternative to a 9lb aluminum one...

 

I have to chime in here. At 11k I replaced my clutch set with ACT and f/w with a Fidanza The reason for this is I got the labor for free. I had lots of disk thickness left but I did not like the look of the f/w. There were thin blue streaks in it. The stock f/w is light and it takes mass to absorb heat so this was not surprising. These facts mean heat on the disk. The pressure plate wasn't discolored but did show some crazing.

I went to Fidanza to gain a replacable friction surface to lower the cost of subsequent replacement and I would have had to pay $319 and tax for a stocker. The difference in weight between the Fidanza and the stock unit are negligible, particularly when you consider where in the rotating mass the reduction resides. Although aluminum will dissapate heat faster than iron the transfer rate to the aluminum form the friction surface may negate the adavantage.

If you resurface the stocker you will expose yourself to a couple of factors that put you at increased risk for warpage. The first factor is lower mass but htis is negligible but the second is relieving stresses in the metal (grain is random in a casting) which might well bring about warpage. ACT is speaking not to run up costs to you but to help you be more staisfied with their products. Is it worth the gamble to ignore their advice? You decide, it's your money.

 

I haven't tested it to see if it is forged or just a ductile casting, but it definitely not grey iron which is what the old DSM flywheels were. Whether ductile cast or forged, it is strong enough to meet SFI certifications and certainly won't have the same tendancy to blow up like most stock flywheels which are made of grey iron. Keep in mind that if it were grey iron it wouldn't warp as bad... instead it may blow through the hood of the car when it shatters.