10-10-2019, 06:42 PM | #45 |
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M3/4 aren't the same car as m2. My Lci is smooth as butter
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10-10-2019, 07:24 PM | #46 |
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10-11-2019, 02:14 AM | #47 | |
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The diff may also be having an effect if you're trying to spin up the rear tires with quite a bit of steering lock applied and a low traction surface. HTH |
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10-11-2019, 06:58 AM | #48 | |
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10-12-2019, 04:26 AM | #50 | |||
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10-12-2019, 07:14 AM | #51 |
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GM have a Patent on how to:
"Problematically, axle shafts frequently exhibit “powerhop” when a large amount of torque is applied thereto. Powerhop typically occurs when tire friction with respect to a road surface is periodically exceeded by low frequency (i.e., below about 20 Hz) oscillations in torsional windup of the axle shafts. Powerhop produces oscillatory feedback to suspension and driveline components and can be felt by the vehicle occupants, who may describe the sensation as “bucking,” “banging,” “kicking” or “hopping.” An independently suspended, driven axle shaft set in which the axle shafts are asymmetric with respect to each other, wherein the asymmetry provides mitigation of powerhop. The axle shafts are asymmetrically selected such that the relative torsional stiffness therebetween is different by a ratio substantially between about 1.4 to 1 and about 2.0 to 1. The asymmetry may be provided by any known modality that alters torsional stiffness and is compliant with operational load demands of the axle shafts, as for example the axle shafts having the same length, but differing cross-sectional diameters; or by the axle shafts having the same cross-sectional diameters, but differing lengths; or a combination thereof." May explain why the part numbers are different for each driveshaft on the M2... |
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10-12-2019, 07:27 AM | #52 |
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No sir, driven very lightly. The only thing I've found is a $700 comprehensive claim, to which I can't find a reason, and the previous owner complained about the brakes so BMW replaced all 4 pads and rotors. And the selling dealership thought the tires were marginal, so they replaced a 4 with the exact same tires that were on it (Conti's, unfortunately).
Other than some remnants of slight condensation in the right rear tail-light (along with the turn signal malfunction) the car just has a few chips here and there, but no accidents or paintwork at all. Oh, and it had an alignment when the tires were put on at 9,000 miles. Maybe they got the specs wrong? |
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10-12-2019, 09:35 AM | #53 | |||
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Maybe try this:
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10-12-2019, 10:23 AM | #54 | |
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10-12-2019, 10:45 AM | #55 | |
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Improved road behavior in the rain. Definitely less interference of DSC nannies when PTTM* out of mountain hairpins + only rare DSC nannies interference anywhere else. I told my mountain friends that it's probably placebo effect inside my mind, but they denied that: lighter weight of the 763M + more tire surface + laws of physics = improved grip and improved turn-in/out. *PTTM: Pedal-To-The-Metal 1 notch up regarding M2 tire size = minor speedometer deviation (table by mToronto):
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10-12-2019, 10:59 AM | #56 |
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Thank you! I am debating whether to go up to 255/275 35 MPS 4S. I just don't want to loose the playfulness that my car now has. Do you feel there is much difference in grip feeling between stock size and 255/275?
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10-12-2019, 11:34 AM | #57 | |
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Going up and down Stelvio pass in Italy earlier this year (763M + PS4S). Pre-breakfast stint Bormio-Stelvio-Bormio (including an emergency maneuver to avoid a marmot crossing the road on a fast stretch of the pass...):
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10-12-2019, 11:57 AM | #58 | ||
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No idea, it's one of the reasons I wanted to contact the original owner. I've done body-work for the better part of 30 years, so no need for the meter, I can tell nothing on the car has been repainted. But thank you for all your suggestions . |
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10-12-2019, 12:02 PM | #59 |
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Check possible date stamps. Easy-peasy.
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10-12-2019, 12:35 PM | #60 |
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Normally the speedometer reports us as +3 kph over what we're actually travelling on 245/265 MPSS. When you swapped to 255/275 MPS4S, what change did that make in regards to the speedometer?
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10-12-2019, 12:44 PM | #61 |
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I get it too when my rear tires are starting to wear out, when it first happened I thought there was something wrong with the car, but now I just get that its a characteristic of the car/tire, running sport cup 2
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10-12-2019, 12:51 PM | #62 | |
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I had Conti tires at first, maybe that's when I first experienced it. Since I've put on mps4s tires in 245/265 then 255/275. I don't attempt a lot of burn outs though. Just from a dead stop in auto or manual mode then punching it no problems now. If I kept it in first and just tried to spin the tires it might start to hop though, but I'd rather not burn up my tires while not moving. |
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10-12-2019, 02:12 PM | #63 | ||
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130 km/u indicated on my dashboard:
Furthermore, no rubbing and a bit meatier filling up the wheel wells. Quote:
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10-12-2019, 03:26 PM | #64 | ||
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