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      09-22-2010, 06:40 PM   #14
The HACK
Midlife Crises Racing Silent but Deadly Class
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Drives: 2006 MZ4C, 2021 Tesla Model 3
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Quote:
Originally Posted by marconi118 View Post
The euro M are not real floaties, the pins are hard fixed to the center cup and the ring.

In a real BBK floating rotors have screws + plates to let the rotor really float, because the caliper is fixed

have a look at the AP racing or Brembo BBK pictures on this and the M3 forum
Actually they are. The rotors are free to "float" on the pins therefor making them true "floating" rotors per the definition. They're just designed differently to allow open access to air for the rotors from both inside and outside of the hub, instead of like typical BBKs where the hub is mounted from outside therefore a slightly smaller volume of air is available (and typically the air near the outer surface of the rotor is the cooler of the ambient air).

The definition of a floating rotor, is the ability of the rotor to expand independently of the hub. The BMW ///M Floaties fits that description nicely. In fact, if you're ever at a track with an E46 M3 with ZCP, you'll hear the tell-tale "pop" when it comes off the track, it sounds like a bunch of pin-drops as the rotor cools down and contract around the fastener. In terms of pure performance of the rotor, the BMW ///M Floaties are actually superior to the typical AP Racing/StopTECH/Brembo design.

And the floating rotor design has little to do with the fixed caliper.

p.s.: If you want to see some REALLY impressive floating rotors, take a look at Performance Friction Direct Drive rotors. They're the BEST OF ALL WORLDS. The mounting hardware attaches to the rotor from the centerline of the flat plane, thus has the benefit of the center-mount floaties of the BMW ///M rotors, but the hat/hub is re-usable thus it has the benefit of typical BBK floaties in that you can re-use the hub. It's the pinnacle of performance rotor "design". There are only two aftermarket companies that I know of that offers a center mount hub design, that's Performance Friction and RacingBrake.
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