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Z435is Aluminum hat 2-piece rotors fit 335
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09-18-2010, 02:01 PM | #1 |
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Z435is Aluminum hat 2-piece rotors fit 335
Following an idea suggested in another thread by marconi118, I ordered Z435is Aluminum hat 2-piece rotors as replacements for my E90 335. About $30 more than the OEM rotor, 3 lbs lighter, better thermal properties.
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09-19-2010, 10:32 PM | #5 |
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Only available for front. I used regular 335 rotors for rear.
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09-20-2010, 01:23 AM | #7 |
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Those might be "2 piece" to save weight but they're not floating rotors.
Here's what true BMW floating rotors look like: Notice how the rotor ring is separate from the actual hub with pins? The Z43.5is rotors are the same as what came on E60 545i. The hub itself are two piece with aluminum inner hub, but the outside hub and rotor are still attached... While it does serve to lighten the load, it has little to no performance benefit in comparison to floating rotors wrt heat transfer and management. |
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09-21-2010, 09:59 PM | #8 |
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Not the same as floating rotor, but heat transfer via Al hub is reduced a bit compared to grey iron.
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09-22-2010, 04:27 AM | #9 |
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these are not real floating rotors, but yes the pins prevent heat transfer and lighten up the disc. E92M3 has the same, but not a direct replacement for the 335i
extra bonus of centre aluminium is no RUST no need to paint it |
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09-22-2010, 11:17 AM | #10 |
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In summary:
Benefits = Lighter weight, slight improvement in heat transfer, no rust. Very reliable, no worries about warping or cracking. Low cost, especially if you are getting brakes replaced under warranty; BMW will not foot the bill for non-BMW aftermarket parts or install, but they will cover installation of these and most of the part cost (amount of regular OEM replacement rotors). Keeps BMW warranty. Great option for daily driver. Cons = Heat transfer not as good on track as full floating 2 piece rotors. Have to replace entire rotor -- disk not removable/replaceable. Not available for rear.
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09-22-2010, 12:13 PM | #11 | |
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Just pointing out some of the obvious. It's still a good alternative upgrade to say, drilled or slotted traditional one piece. It's still not as good as using a floatie like the Motorsports Euro Floaties on the M3 ZCP/CSL. But those floaties are a lot more expensive too. |
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09-22-2010, 12:58 PM | #12 |
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I want these for my coupe
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09-22-2010, 04:24 PM | #13 |
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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 |
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09-22-2010, 06:40 PM | #14 | |
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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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09-22-2010, 08:43 PM | #15 |
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stressdoc, did the dealer bill BMW for these and you just picked up the difference?
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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09-22-2010, 11:52 PM | #17 |
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What is the weight of a oem 335i rotor?
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09-23-2010, 12:44 PM | #18 |
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Pedal feel is a function of caliper design and brake line stiffness. Rotors do not alter that. Overall braking difference is a function of tire grip and coefficient of friction for the pad material. Once properly bedded in rotors do not alter that, if it's the same size rotor.
What rotor design will affect, is 1) cooling properties for repeated use and 2) unsprung weight. Anyone telling you that changing their rotors made the pedals feel different, or bettered their single stop braking distance...Probably should not be trusted to provide subjective feedback. |
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09-24-2010, 12:08 AM | #19 |
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anyone?
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09-24-2010, 01:14 PM | #20 |
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The dealer will bill BMW for the regular, authorized warranty service. Anything outside of that is my responsibility. In this case the dealer would get credit for regular rotors, and I will cover the difference in the cost of the alu hat rotors. There is an extraordinarily sensible Service Manager at the local dealership here, not sure if others would be as accommodating.
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05-19-2011, 10:00 PM | #22 |
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