Originally Posted by Rusty

Ok, I'm home now, and not distracted. Last year at a trackday. Was talking to a couple of other drivers. The subject of aluminum flywheels come up. The consensus was that they are great for the track. For street use. There is more slipping of the clutch to get moving because of lack of inertia. You have to change your driving style for it. In stop and go traffic. This extra slipping has lead to deep heat spots on the friction ring. A couple guys said that it affected disk life and feel for the clutch. 3 said that they switched back to steel. The other 4 still running the aluminum. But these guys change the friction ring on a regular schedule. The one guy had a pic on his phone and the friction ring was a solid blue. To turn blue. That's about 650F to 750F.