Quote Originally Posted by Psycho
Here's the dealio, if you go too light of a flywheel on most cars, you start throwing check engine lights. Something about the crank position sensor getting tricked. Also, the lighter you go, the harder it is to drive your car around when coming from a complete stop (going over speed bumps, or re-parking in a parking spot).

What ever flywheel you decide to go with, you need to choose the correct clutch to go with it. If you get and un-dampened flywheel (solid metal) you need a sprung hub clutch, if you go with a dampened flywheel like a fidanza (has a replaceable insert on the face of the flywheel) you need an un-sprung hub clutch.

If you get an un-dampened flywheel and a un-sprung hub clutch, you'll put a lot of shock into your drive train on launches and possibly start breaking stuff. If you Mate a dampened flywheel to a sprung hub clutch, you'll have too much dampening and you'll wear your clutch out really fast.
Running a 8.5lb Cusco on my ITR, no check engine light and no other issues. I'm all for a light flywheel, single best mod I think you can do really if you're truly a driver...just not entirely sure how light with a turbo.

The check engine light wouldn't matter on this car because I'll be running a full standalone anyways. Doubling the HP with the engine swap from a different BMW then doubling that power with the turbo at low boost.

I could care less how difficult it is to drive, you learn to deal with it! The clutch flywheel combo I'm looking at is very streetable though...uses an OEM BMW pressure plate with a resurfaced sprung OEM clutch disc. Granted the flywheel is practically 25lbs lighter than the original dual mass mess there is still virtually no chatter or transmission noise with the way it was designed. I just have not met anyone with a turbo running it. Click the link I originally posted, that combo setup has been out for 5 years and still selling.


Quote Originally Posted by Axix23
Why the fk would you want to rev faster when your throwing a turbo on a fwd car, your revs will be hella fast when you lose traction... LOL
quit talking, lol. FWD and turbo's only have one purpose in life: that's 10" slicks and driven in a straight line....that's not for me, sorry!


Quote Originally Posted by Big Baller
You aren't giving up anything unless you drag race.

Its easier to launch a car with a heavier flywheel because it maintains its momentum better. When the clutch clamps down it still has some balls behind it.
ahh, just who I wanted to hear from! The old Group B rally cars and turbo Formulas all seemed to have ultra lightweight flywheels...so it always made me curious why its normally not encouraged. I tend to believe what is race proven and from people who know first hand before anything else