I have heard from other if you get a lightened flywheel that you lose torque but rev faster obviously, is this true i cant see how, it reduces the rotational mass please help me out here

 

yeah i've heard this, but i've also heard that it warps your crankshaft (or maybe that was an underdrive pulley) i think that it causes more vibration to your engine, which isn't good,because it's lighter, and hurts it, but i have no experience on it and am just saying what i've heard

 

well if it is spinning just as fast as your stock one i cant see it vabrating mroe unless you mount it incorrectly or soemthing

 

aftermarket crank pulley's can lead to problems with engine harmonics at high rpm's.