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Posted by KraZy007 on January 29, 2001 at 21:25:13:

In Reply to: Re: Lightweight flywheel VS pully posted by TechnoViolent on January 29, 2001 at 21:18:42:

fly is more expensive, more expensive to install, yields zero hp and zero torque increase, increases vibration, makes it more difficult to get car moving from stop up a hill and requires a software change to raise the idle speed to prevent stalling. It DOES allow the engine to rev up (and down) a whole lot quicker, thereby increasing acceleration.
Pulley is cheaper, cheaper to install, boosts hp by 10-12, boosts torque by about 20, allows engine to rev quicker, has no adverse affects on driveability. It is RUMORED (especially by those who sell flys but not pulleys) to have adverse long term affects on the engine, although I have never heard of even one real life problem with a pulley. Get the double pulley, the single pulleys toss belts, unless "shimmed" perfectly. BTW, you can't run both a pulley and a fly at the same time.

anyone with these setups have anything to say about them? Pros/cons? Ease of installation? Maintenence? As far as the pully goes, what;s the difference between single and double belts? I got a 95 M3, which do i need? thanks


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