01-10-2021, 08:01 PM | #89 |
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Whatever change is relevant to what was done to the G8X if you as I believe his comment was done with the G8X in mind. I’m hesitant to say one or the other due to the possible tolerances and implementation of the tires and wheels. I haven’t measured them myself...statically or dynamically at different temperatures and load.
And again I don’t need or even want to know that. If lemetier say that they staggered the wheels to increase the longitudinal contact patch that is clear as day to me as why and all I need to know. Last edited by solstice; 01-10-2021 at 08:32 PM.. |
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01-10-2021, 08:45 PM | #90 | ||
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01-10-2021, 08:59 PM | #91 | |
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01-10-2021, 09:20 PM | #92 | |
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Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black Last edited by CanAutM3; 01-10-2021 at 09:25 PM.. |
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01-10-2021, 09:42 PM | #93 |
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And as I said, I was never really interested in the details of how but I did want to know why they did it. So no, I’m not seeking justification that’s your faulty interpretation since it happened to match Porsche’s reasons I mentioned. If lemetier had said it was a fashion move or to improve front end grip, I would have taken that as why without further explanation...but he didn’t
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01-10-2021, 09:45 PM | #94 | |
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Where did lemetier specify that what he said applied to the G8X?
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01-10-2021, 10:03 PM | #95 | |
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So no it’s not based on seeking justification it’s based on probability of being the “why” directly from the horses mouth. If you manage to get him to answer to the opposite, well then I’ll go with that. Btw. I’m writing a question for you in the G8X vs .... section if you don’t mind taking a look over there in a few minutes. Last edited by solstice; 01-10-2021 at 10:08 PM.. |
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01-10-2021, 10:11 PM | #96 | |
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01-10-2021, 10:23 PM | #97 |
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Improved front end grip (less understeer).
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01-10-2021, 10:32 PM | #98 | |
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From what I know of him, he is not specifically a "BMW insider", but an insider to the automotive world in general, which gives him insight to BMW .
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01-10-2021, 11:15 PM | #99 |
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If I’m extrapolating you are stretching and being a bit judgmental while you are at it I might add. You say I’m justifying when all I said here is that I trust the manufacturers claims about this. We only had Porsche’s reasons for the 992. Then we got lemetier who I believe have better insight than anyone else here as to BMWs reasons.
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01-10-2021, 11:18 PM | #100 | |
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01-11-2021, 03:44 AM | #101 |
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275/30-20 wheel has the same diameter as OEM 275/35-19, putting lighter 20" rims in the front we can have a better look and keep the same ratio F/R without adding weight, but I don't know how the lower sidewall only in the front could impact on dynamics.
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01-11-2021, 04:51 AM | #102 | |
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275/35-19 is 675.1mm (Edit - corrected diameters) CanAutM3 stated earlier: So a lower sidewall would probably increase understeer all other things being equal.
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01-11-2021, 05:02 AM | #103 |
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01-11-2021, 07:18 AM | #104 |
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When calculating the tire diameter, you need to double the sidewall height...
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01-11-2021, 10:23 AM | #105 |
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Corrected!
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01-11-2021, 07:01 PM | #106 | |
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Any idea why they switched to a floating rear brake caliper from the 2-piston in regular form and 4-piston with CCBs? I doubt that a floating rear caliper has as much clamping force as a 2 or 4 piston caliper. Or is it all for weight savings and they've offset it with a larger rotor? One thing I find with my M3CS is that on track the brakes aren't the most confidence inspiring... I'm completely stock down to the pads/lines/fluid, standard brakes, no CCBs. Since you have a near identical car and infinitely more knowledge about these, figured I'd ask! |
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01-11-2021, 07:49 PM | #107 | |
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The single piston rear brake calipers are for the e-parking-brake. A real pain IMO, since you can no longer do quick track side rear pad swaps in the paddocks without having to carry a laptop with you to reset the e-brake. Plus they are paired with puny little pads . Single piston vs multiple piston is not about clamping force, as a single piston can apply sufficient force to lock the brakes. It is a question of distributing this clamping force over al larger area for a more even application, which can also accommodate larger pads for more swept area. I find the iron brakes on my M4cs to be plenty sufficient on track, but they do need proper track pads. PF08 are my favourite thus far. Stock fluid works decently fine, but you are better off with Castrol SRF.
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01-11-2021, 07:59 PM | #108 | ||
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So floating rear caliper is more of a pain since not as easy to swap pads, but not a huge difference in terms of performance? Also, they definitely don't look as cool (because that's what it's all about after all!) Ya I know off topic, seemed close enough though! |
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01-11-2021, 09:04 PM | #109 | |
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01-12-2021, 01:56 AM | #110 |
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The same happens on heavier and more performing cars than the M4 (M5 F10, M5 F90, M8, Audi RS6/7, Lamborghini Urus, MB 63AMG), all with electric parking brake.
This would have been the alternative. |
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