I saw this posted in the LSJ mod thread and it made me wonder, what could it really hurt running a lighter flywheel?

I have the Fidanza flywheel in my car now, with the ZZP S2 clutch and it drives like normal for the most part. I have to take off a little higher in first as the clutch is really grabby, and low speeds 1st and 2nd can be jerky at times. Which is to be expected. Am I missing something here that this would be harmful in any way to our cars or transmissions?

 

I am not really sure, but from experience, the flywheel removes the harmonics that your engine produces. If I had all the money in the world, when installing a lighter flywheel I would have the clutch, flywheel, and crankshaft balanced together at a machine shop before installation. This would create a perfect balance and would minimize any possible failures do to high harmonics.

 

does the LSJ use counterbalance weights on the stock flywheel to externally balance the rotating assembly? the worst thing i can see that will happen is getting a vibration issue.

if the stock flywheel is zero balanced, if you just make sure the clutch assembly is zero balanced, and the flywheel also, there should be no issues.

with a lighter fw, you wont launch as hard, and your shifts probably wont be as hard. Having that extra rotating mass of the stock fw can really help you from a launch or during shifting.

however on a race course, its probably better to have a light one because of the throttle response and increased rpm acceleration for faster rev matching. Engine braking will also be better with a lighter flywheel. not to mention slight weight savings for better handling/braking/accel.

overall, i think the lightweight fw is an upgrade. im installing one on my vette in the spring.

 

I can shift slightly faster with the new FW but i need a clutch rod for this to be perfect, bring my engagement up a little. Either way I have about 3k on this setup and I'm really happy. i would suggest it to everyone!