smart dsm'ers don't buy fidanza...
guess whats the only flywheel I've seen or heard of failing?
Someone said the 17 lb fidanza has less rotational mass than a stock dsm flywheel... stock dsm flywheels are 20 lbs. Aftermarket lightweight ones are 8-11/12 lbs (fidanza-act). With how much larger the diameter of the t-56 flywheel is, I HIGHLY HIGHLY doubt it has less rotational inertia than a stock flywheel.
For those who don't know how a harmonic damper works: Because Combustions are not constant driving forces on the crankshaft, the crankshaft itself developes harmonic twisting forces within itself. That is to say the crankshaft itself twists during opporation, then flings back like a spring and goes the other way, coming back again after another combustion. These twisting forces are reduced by the calculated mass on the outer ring of the harmonic damper. The rubber acts as a spring allowing those forces to be dissipated through this weight. Unfortunately a harmonic damper can only work for a small range of rpms. Aftermarket harmonic dampers assume you will spend more time at a higher rpm and design their product accordingly.
changing the flywheel, so long as its balanced, shouldn't change this too much, although it definately will.
P.S. I'm one of the guys who bought one of bill's t-56 bell housings, although he had to modify it for the long shaft LS-1 version that I bought instead of the normal short shaft LT-1 version. The shifter is about 2-4 inches farther back than stock, but I bought a short shifter that moved it back up a little, and also I plan on moving my drivers seat back farther so my knees stop hitting the dash. I also have 4.75 montero gears for the stock rear end so that 6th gear is usable.
also, are you guys getting these things to fit in your stock tunnels? I had to make a new tunnel for mine. Don't see how it can be done any other way, but this adds significant time and money to the project.
Edited by TsTKl, 28 July 2011 - 04:10 AM.