01-17-2021, 08:25 AM | #89 |
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The Ultimate Tramlining machine.
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01-17-2021, 12:52 PM | #90 | |
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will better handling and faster with an upgraded interior. Boss!! I will be waiting for the AWD. |
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01-17-2021, 01:05 PM | #91 | |
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2018 F80 Santorini 2019 Z4 3.0i 2022 X2 M35i |
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01-17-2021, 01:14 PM | #92 | |
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Then when I switched to Michelin Pilot Sport 4S (an “upgrade” by all accounts compared to the OEM Pilot Super Sport) and i went with 275 fronts, I’m still ok. So I doubt it will be a major factor. After all, they do have occasional rain in Germany.
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01-17-2021, 01:18 PM | #93 | |
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Anywhere in Spain for example they use draining asphalt on highways that allows the surface to be wet but you don't find puddles. I didn't really understand aquaplanning until I moved here |
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01-17-2021, 01:41 PM | #94 | |
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I’ve driven 3,000 on my car in Europe during Euro Delivery and know their roads have much better drainage, but even here in the US i don’t regret going wider at the front...
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01-17-2021, 01:56 PM | #95 | |
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01-17-2021, 02:26 PM | #96 | |
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I have zero concerns about daily drive ability and safety with the standard 275 or optional 285 fronts when shod with modern Michelins. As far as comments of the new car not being much upgraded according to these videos. They say it’s partly faster than the M4 GTS so the implementations described here including tire/wheel selections sure seem to be working... Last edited by solstice; 01-17-2021 at 02:32 PM.. |
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01-17-2021, 04:39 PM | #98 | |
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01-17-2021, 04:51 PM | #99 |
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01-17-2021, 04:52 PM | #100 | |
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1/ the rear-axle mainly needs to deal with the lateral forces for propulsion, but the front-axle (certainly in combo with AWD) only deals with transversal forces. A higher side wall on the front provides a more progressive behaviour on steer-in. I remember going to a driving course of BMW and the instructors learned me that I provoked understeer by being too aggressive on steer-in. The higher side wall helps to be more progressive and it uses the grip limits to determine the tightest corner and renders a cleaner traject with less understeer. 2/ In the AWD version, the front axle becomes also responsable for the propulsion. In this case a stiffer side-wall makes sense. But seen the weight distri (which will be worse for AWD) and the potential understeer behaviour, I would bet that M prefers the staggered combo. |
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01-17-2021, 04:57 PM | #101 | |
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01-17-2021, 05:09 PM | #102 | |
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01-17-2021, 05:18 PM | #103 | |
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Cause I’m skeptical that BMW left any obvious advantage on the table when they designed the M4 GTS with staggered diameter. Of marketing reasons they needed the pros to post the quickest time as with the M5CS. |
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01-17-2021, 05:35 PM | #104 | |
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01-17-2021, 05:39 PM | #105 | |
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01-17-2021, 05:51 PM | #106 |
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Certainly! Chances for AWD are higher that front/rear uses the same diameter, but the weight distribution is also important. We'll probably move towards 55/45% and in this case, a higher side wall on the front is maybe still preferable. I presume what we discuss here is exactly the job of Frank in the video, still a bit disappointed he didn't go at all in this subject and only touched some generic specs of tires!
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01-17-2021, 06:00 PM | #107 |
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They also mentionned that having a bigger air volume helps dissipate more heat. They also used bigger front calipers. The front is also heavier.
We often think one decision is to help one aspect but it's the fine equilibrium of all the small changes working together that produce the better results.
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01-17-2021, 06:16 PM | #108 | |
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01-17-2021, 06:30 PM | #109 | |
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01-17-2021, 06:53 PM | #110 | |
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