How heavy the pressure plate is has no effect on whether a flywheel warps. The material used in the disc can have an effect on the flywheel insert warping , but what effects the insert the most is how much the clutch is slipped. When a clutch is fully engaged there is not any wear on the flywheel, disc, or pressure plate as long as the pressure plate is strong enough to hold the amount of HP the engine is making. The stronger the pressure plate the less chance of slipping under power. How strong someone thinks the insert is mute. If you launch a car hard by slipping the clutch, It can be an NA or a TT and if you have a solid THIN steel insert it will warp easily! When you install A light weight Flywheel you will wear out clutches sooner and create more heat.....The reason for this is simple. A heavy Flywheel has more inertia to get a heavy car moving. A lighter flywheel has less inertia so to get a car of the same weight moving you will need to slip the clutch more. This simple fact will wear the clutch faster and make more heat. Living on a hill or in areas where you stop and start on hills, where it is necessary to slip the clutch to get the car moving will generate a lot of heat and cause the THIN solid inserts to warp. Slipping the clutch creates crazy heat! the outside of a steel insert spins faster then the inside of the steel insert and it will heat at different rates causing it to curl. This leaves less contact area or friction surface for the disc to grab causing cars with higher HP to slip under acceleration even when fully engaged. I have changed out numerous clutches with lightened flywheels and all kinds of different friction materials from stock disc's to full metal racing disc's and I have never seen a solid steel insert come out that was not badly warped. If your a drag racer your better off with stock heavy flywheel. If you really want a light weight flywheel and do not mind going through clutches sooner The RPS segmented Aluminum Flywheel is by far the best way to go. The friction surfaces in the RPS Flywheel will not warp because they can float being separate instead of pulling against itself. The RPS separate inserts are also twice as thick as ones found in solid insert flywheels. The jun flywheels are heavier and although they will not warp, They are to thin and get hard spots too easy. Every jun flywheel I have ever taken out has had hot spot all the way through to the back side. This is because they are so thin they get hot easier. For road racers the light weight flywheels are GREAT! also once a car is rolling the light weight flywheels shine. Turbo cars go into boost faster and easier once rolling with a light weight flywheel.
