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Originally Posted by Sammy
Does anyone have experience with replacing the stock rotors with lighter weight rotors? I've done searching and am coming up short. I'm referring to ceramics, 2-piece, floating, or anything else done to reduce weight... I already have cross-drilled so that idea is out. 
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Hi,
I'm not aware of any out there and it may be for a reason. Ceramics would be cost prohibitive, possibly running 20% of the overall value of the Car. And, a certain amount of mass is required.
Think of the rotors as sorta a rotating Heat Sink. Your Car really stops because it converts Mechanical energy and Inertia (stored energy) into Heat Energy through the Rotors and Pads which is then dissipated to atmosphere. Once enough energy has been released (or leaves the system) leaving an amount less than the Forces acting on the Car (Air resistance, Rolling resistance, Gravity), the Car stops. To a point, a less massive rotor cannot absorb as much Heat as quickly, so braking would be adversely affected.
The best way to reduce unsprung Mass would probably be to look at the Wheels and Tires. You'd get the greatest effect without sacrificing Braking efficiency...
Happy Motoring!... Jim'99
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