03-04-2024, 08:09 PM | #89 | |
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And I'm quite sure that European manufacturers like BMW M and Porsche have brake bed-in recommended procedures in their manuals. In any event lets see how they behave.
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03-04-2024, 08:18 PM | #90 | |
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03-05-2024, 08:28 AM | #91 | |
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I personally don't know enough about the stock compound on BMW M brakes but I would assume that they are not specifically track focused since the G87 is a street car first. Knowing that, I would use a more track focused pad for track days. Swapping them doesn't take that long and you should bleed the fluid anyway.
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03-05-2024, 02:00 PM | #92 | |
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Just messy. |
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04-07-2024, 11:21 AM | #93 |
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G8X brakes are completely different. M2 has higher performance compounds than the M240 which is why most G8X brakes make noise. All G42 (230 / M240) share the same compound as well with the M Sport brakes, but if someone has noise with those it is not normal and should be repaired.
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04-29-2024, 03:42 PM | #94 |
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So I'm about to hit 3,000km (around 1850 miles) with my M2, and I have the most obnoxious, embarrassing squealing during light braking... ie when the streets are full of people, staring at my $90k car for the wrong reasons. Should I take this to the dealer? Are they going to offer a solution, or is this just something I have to accept? It is "windows-down" season, and it's already killing me.
*edit* did a bit more reading, sorry for the bump. Looks like this is "normal" for an M car, and the only real solution is $800 in iSweep brake pads. Not too impressed. Last edited by jessejericho; 04-29-2024 at 03:49 PM.. |
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04-29-2024, 06:16 PM | #95 | |
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How does the M2 honestly compare to the SS 1LE in that regard? FYI: I had a then new special order '99 1LE Z28 and have a 2025 M2 on order pending allocation. - Bob |
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04-29-2024, 06:20 PM | #96 |
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For the noise, it is not the only solution, read some more.
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04-29-2024, 07:45 PM | #97 |
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I read the whole thread. Did you? Washing and then doing 70-0 braking 5 times, or spraying SBS on the rotors? Temporary, annoying solutions with YMMV results. If I missed something important, let me know!
I never hear a Porsche squealing up to a stop sign. Just really disappointing in an otherwise amazing car that I'm loving. |
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04-29-2024, 09:27 PM | #98 | |
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Good luck. |
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05-05-2024, 11:21 PM | #99 | |
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The M2 is a much better street car in all aspects (visibility, noise levels, space for items in the cabin, display, etc). It somehow feels like a much smaller car (it is not) and I love it much more than the 1LE. It is very competent at the track, but with lower grip limits with the stock PS4S, than the 1LE on the GYSC3s. It seems to have slightly more power, but I'm still ~1 sec slower/1 min of lap time. I think switching to forged wheels and a tire more in line with the the GYSC3 that is standard in the 1LE they will be very close. Only thing I really don't like about the M2 is the ridiculous fact that front camber is not adjustable - crazy in a sports "M" car - unless you go aftermarket. Also everything is more delicate on the M2 - for example the lug nuts on the 1LE are massive 22mm and torqued to 140 ftlbs. On the M2 they are dainty 17 mm bolts torqued to ~100 ftlbs - but have to trust the German engineering here. Another difference is that the rear of the M2 is never settled - it is moving ALL the time on track Kind of fun, but different than the 1LE which is as predictable as the Porsche 20HP increase with every generation.
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Last edited by baron95; 05-06-2024 at 11:30 PM.. |
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05-06-2024, 01:19 AM | #100 |
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The Camaro wheel studs at M14x1.5 class 10.9 thread are exactly the same size as the M2 M14x1.5 bolts, the head size is immaterial. GM using 190Nm torque is right at the stress limit for that thread size, BMW at 140Nm gives a lot more margin for error before stud/bolt damage due to over tightening. 17mm socket size allows smaller wheel holes, leading to a stronger hub area of the wheel due to less material needing to be removed for larger socket clearance.
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05-06-2024, 11:26 PM | #101 | |
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But putting a 22mm socket on my Camaro and JL Rubicon lugs is still much more satisfying - and the 140ftlbs and 130ftlbs respectively have at least a mild placebo effect
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05-06-2024, 11:41 PM | #102 | |
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With wheel bolts the head can be a lot smaller, M14 wheel nuts couldn’t use a 17mm socket as the wall thickness would be too thin. A standard nut uses a socket about 1.5 times the thread diameter, so 21 or 22mm is the correct size for an M14 nut. |
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