the heavier the flywheel, the smoother the idle, the easier the starting is from a stop, and the smoother the cruising/slight throttle changes are. BUT - the slower the acceleration is. The lighter the flywheel is, the harder it is to get the car moving from a stop (just requires a somewhat higher RPM before the clutch is let out - which wears the clutch faster), depending on porting, Intake
, and exhaust, the idle will be somewhat rougher, and some "jerkiness" may be noticed while cruising. BUT - you will be able to accelerate faster.
but only when you are already moving
The above reasons are why there are basically three types of flywheels offered. The stock units are fine for most "normal" driving, as done by the vast majority of drivers. The light steel ones are great for "spirited" street driving, middle range autocross classes, some drag racing (heavier is sometimes better), and just general high-performance applications that will still be driven on the street sometimes. The lighter aluminum flywheels we continue to not recommend for street driving
Now I got this from Mazdatrix but the same princable still applies. you can use the is info as you with. I hope thishelps you out