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      09-19-2011, 06:32 PM   #19

Drives: M3
Join Date: Sep 2011
Location: USA

iTrader: (0)

Originally Posted by Gearhead999s View Post
40 lbs of rotational mass is huge!I have a friend who has a GT3 with the ceramic brakes and he has done over 25 trackdays with only 1 pad change just recently and he is not slow!The car is also used by his kids so it is on the track a lot
Its actually not rotating mass, it is unsprung mass in this case. Wheels/tires for example are rotating and unsprung. Flywheel or drive shaft is rotating but not unsprung. That is why light wheels/tires are the best performance upgrade for cars for the money (aside from FI tunes). Nevertheless it still is good for handling/ cornering and overall weight loss. Does not do much for acceleration other than being lighter by 40 pounds.