Frat32
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Outside rotor face to outside caliper face ~44.5mm Just a note...Remember that these measurements don't account for the rotor and caliper offset from the hub/mount. So if you are comparing the measurement I got to one you got with a different rotor/caliper combo, the numbers may be very different, even if the distance from the actual hub to the outer caliper face is the same. For example, your rotor sits 20mm in (under the car) from the hub face, and you get a measurement of 50mm from rotor face to caliper face, so the caliper face is 50 - 20 = 30mm out from the hub, whereas my rotor sits 10mm in (under the car) from the hub face and I get a measurement of 44.5mm from rotor face to caliper face, so the caliper face is 44.5 - 10 = 34.5mm out from the hub. Here we see that even though I have a smaller distance between rotor face/caliper face, the distance from the actual hub is 4.5mm further (and so 4.5mm closer to the wheel spokes). I'm not sure if the caliper offset is the same or not between the stock and D2 rotors so it's impossible to give an actual answer.
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The direction of the slots in the face of the rotors are not important. The inner vanes are, as you said, important for cooling, and in this case run in the opposite direction of the slots. From what I've read, I believe this is so the slots and vanes are cut across each other to ensure strength and uniformity, as if they were cut in the same direction it's possible for a vane and slot to cross/follow (on-top/below) eachother for a significant distance and create a possible weak point which can also be prone uneven (over)heating. Thanks for the concern though.
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There's got to be less than 5mm difference between these and the stock Sumitomos. I never measured to do a direct comparison but if I had to say, I would say that the D2 calipers are slightly narrower than the stock ones. When I took the stock brakes off they really felt huge in the hand. The width and weight of them was definitely surprising to me. The D2 calipers are huge though - the length of them was much bigger than stock...You can see in the photos just how much closer they are to the barrel of the wheel at the top and bottom points. They are heaps lighter than the Sumitomos though. I don't have any photos of them side by side, or even any real close-ups of the stock calipers in the RPF1's. I found a few seconds of video though that shows if for a second which may help you see the clearance a little. You'll have to try and play/pause a few times so you can see it properly - https://streamable.com/igpwd I'll stick a ruler in there tomorrow and post the pic.
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Spoke clearance is no issue at all - there's heaps of room.
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Just a quick update for any future viewers. Got some 330mm D2 brakes and installed them. Bolted up nicely; just needed to trim the rotor backing plate and bend it, and take ~5mm off a mounting arm that the factory brake lines bolted to that fouled on the adapter bracket. Has around 10mm of clearance between the caliper and wheel barrel.
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Thanks for that info. Yea - I noticed they have a little step-in close towards the spokes and then widen a little through the rest of the barrel to the inside. All depends on how the adapters mount and the offset of the caliper on whether they will catch that section or not. Like you said it may or may not clear, and I think even if it does it'll only be by a few millimetres and I'd rather not run them that close.
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Yeah, I didn't expect them to fit. The RPF1s have a pretty big step/lip down to the outer edge of the rim from the spokes. When you look at them next to a 17" TE37 or LMGT4 the barrel looks very small in comparison (and they don't clear by a huge amount). Thanks for the info Duncan. I think I'll have a look into the 330mm kit. Just didn't want to be held back for rotor/pad choice in the future, but it sounds like the rotors/pads you get are more than capable for some drives up the mountains. Plus I read that they are interchangeable with Ferodo, Hawke, EBC and AP.
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Hmmm...I was looking at the D2 330mm 8-pots as another option also because of the smaller size and good reviews (and of course the price). I seen you have them on a 32 track car and Stagea. Reading through a few threads I found from years back you seemed quite happy with them. Do you still run them and like them? What pads and rotors do you use as replacements on your Stagea? It's for a street R32 GTR that currently has the stock Sumitomo calipers with around 260wkw. Thanks, George.
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Hey, Does anyone have any experience with the fitment of the Alpha Omega 350mm Evo Brembos onto an R32 GTR with Enkei RPF1's in 17x9.5+18? I've seen standard Evo's running 17" RPF1's and they clear, but obviously they have the 320mm rotors. I'm pretty certain the caliper will clear the spokes, just unsure with the barrel clearance with the bigger rotor as they don't look as big as the TE37s and LMGT4s in 17". Thanks, George.
