01-22-2022, 07:42 AM | #23 | |
2020 Z4 M40i - 2022 M4C Convt
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Have a set of PS4 and a set of PSS on two different cars. Not a true head to head matchup but found PS4 to be all round slightly better. The M40i does not have enough tire, 275, with street compound summer tires to eliminate it. Maybe one size up if they will fit the wheel & body might work. Just gets progressively worse under 40. Right now looking at 5" of snow & 22*F here in the sunny south, tires will slip 100%. Winter Sucks & there is no snow removal equipment outside of the Sun.
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01-22-2022, 07:57 AM | #24 |
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01-22-2022, 08:33 AM | #25 | |
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01-22-2022, 09:46 AM | #26 | |
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01-22-2022, 09:04 PM | #27 | |
2020 Z4 M40i - 2022 M4C Convt
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PS4S has a UTQG treadwear rating of 300. PPS has a UTQG treadwear rating of 300. Both among if not the best dry traction for a street tire that has to last awhile, handle wet streets & ride pretty quiet. Most summer street tires are 320 & higher. How our Z4 tires sit against true performance performance ties is another story. Real performance tires don't last long, have outstanding dry traction, suck on wet streets & are noisy. In our AutoX classification you can go as low a 200 street legal tire & still run in the stock classes. You are looking at something like a NITTO NT555-G2 which comes in two flavors 320/200. My Cobra runs NITTO NT01 Road Course 100 treadware DOT legal street tire & is forced to run in the XP class because of tires. FWIW or not the Cobra runs 275 (10.9) in front & 315 (12.6) in back. A hard launch in 1st at 1850RPM will burn then. New tires @ 10,000 miles
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01-22-2022, 09:57 PM | #28 |
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That's what's nuts, i don't even have the M40i. lol
Noticed it's been happening more as it's been getting colder... hope that's all it is, honestly. Just sucks that I wanna open her up on a back road and it's like.. shimmy shimmy shimmy then GO. |
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01-23-2022, 07:17 AM | #30 |
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The real problem here is that BMW puts engines in their cars whose power really bullies the scrawny rubber they shoehorn in under the fenders. Ever increasing interior space requirements mean the only sollution is to make wider bodied cars and as it is the G29 is a wide assed bird.
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01-23-2022, 02:14 PM | #31 |
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Not the AS3 - the Michelin Pilot Sport All Season 4 XL - 45,000 mile treadwear warranty. They will hopefully last twice as long as the OEM tires.
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01-23-2022, 06:11 PM | #32 | |
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01-23-2022, 06:12 PM | #33 | |
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01-23-2022, 07:24 PM | #34 |
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I still have my summers PSS on for the winter. On dry road, even below freezing, I don't notice any loss of traction (could always break loose the rears, warm or cold). But on ice and snow, they are utterly totally completely worthless!
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01-23-2022, 10:57 PM | #35 | |
2020 Z4 M40i - 2022 M4C Convt
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02-08-2022, 05:37 PM | #36 |
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02-08-2022, 06:07 PM | #37 |
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Also new tires. 😉
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02-09-2022, 01:36 PM | #38 |
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Mine has don that since day one, but I am hard on it all the time. Not sure why the traction control does not come in with the rear starts to axel hop. Seems like the bushing may be soft so they wind up and then release causing the hopping. I think the only way to fix this problem is with harder bushings since there is no way that I am backing off. For now I just try an avoid the problem with much less throttle until third gear then full power does not seem to be a problem other than the rear dancing around.
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02-09-2022, 01:44 PM | #39 | |
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I guess I'm just old now but driving a 450hp Superbee 440-6 with F70-15 biased ply tires.....THAT's scrawny rubber. .....mind you, these guys still manage to get a sub 10 second run with them on; OK, carry on. Dave |
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