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Old 05-21-2011, 05:14 AM   #34
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Join Date: Feb 2008
Location: Philadelphia
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My Ride: M3 & ZHP
Originally Posted by mkodama View Post
I agree with everything you say other than two things:

-Lower overall brake temperatures, no. What does a floating rotor have anything to do with the cooling of the rotor? If anything, overall temperatures might be higher since rotor heat can't travel to the top hat any more.

-Floating rotors are quite common when there is the money and the car ends up on the track. BMW used them stock on the E46 M3 CSL/ZCP and E92 M3. Look at any of the good brake kits for race use and they are almost always floating. Most factory race cars these days come with them from the factory.
Well I was thinking lower temperatures for two reasons: A) aluminum is better at dissipating heat than iron. And B) Generally floating rotors also have directional cooling vanes - I don't think I've ever seen a set that didn't have them. I've yet to see a 1-piece rotor with directional vanes sold for the E46

For the second point - read my post more carefully. I said blank floating rotors, like the ones on the euro E36 M3 and euro E39 M5, aren't too common these days. The drilled ones like the ones found on the euro e46 m3, CSL/ZCP, and all recent M-cars are obviously fairly common.

Last edited by TerraPhantm; 05-21-2011 at 05:16 AM.
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