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Keep in mind that if you go lightweight FW, you will lose torque.
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Although the launch is a little weaker becuae you lose engine inertia relative to vehicle inertia (which barely changes with the little bit of weight you save) if you look at the engine and drivetrain as a whole, where would the lighter flywheel put the torque - if it were causing you to lose it?
Anyway, I went from a stock flywheel to the Fidanza, I picked up 0.2 seconds in the 1/4 mile. (13.4 to 13.2) with a completely stock RX7.
I didn't notice that the launch was that difficult with a stock-type clutch in the car.
I now have a RB 12 lb turbo flywheel in the car with a spec stage 3+ clutch and it is a bit challenging to get it moving without a smoky burnout, but I don't blame the flywheel.
Your idle may not be as smooth.