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M2 Technical Topics > Track / Autocross / Dragstrip > Max rubber on the M2?

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      03-01-2024, 11:24 AM   #463
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Quote:
Originally Posted by AmuroRay View Post
Are you running the stock spring rates, and do you know what they are?
Stock springs rates, not sure what they are. They are a bit stiff for around town, but excellent on track.
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      03-01-2024, 11:43 AM   #464
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See, I have a set of PSS springs here - they said (back in the E46 days) the rates between the PSS/10 were the same. Now I don't think that's the same between a M and non M (IE a M3's PSS spring rates aren't going to be the same as a 330i's PSS10)

I wonder what the spring rate differences are between them?

Anyhow while I was writing this, I found what I was looking for:

https://f87.bimmerpost.com/forums/sh...8&postcount=14

PSS10 M2 are supposedly 514F/800R Progressive?

I have PSS with Linear 350F/900/R for flat ride frequency.

I'll have less power and tire, and likely less total grip - and less race pace. How far off is all of this worth?
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      03-01-2024, 12:30 PM   #465
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From a road and track feel I'm in love with the 295 square setup. I did upgrade the front sway and it really fits my driving style. It also helped with weight transition in corners.
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      03-01-2024, 01:01 PM   #466
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Quote:
Originally Posted by AmuroRay View Post
I've seen this test a while ago, but wanted to get actual road feel perspectives. Thank you!
265 on a 9.5” will certainly be a noticeable grip increase. 265 on a 9” will kill initial turn in and make the steering feel sloppy.
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      03-01-2024, 01:29 PM   #467
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Originally Posted by medphysdave View Post
From a road and track feel I'm in love with the 295 square setup. I did upgrade the front sway and it really fits my driving style. It also helped with weight transition in corners.
I'm liking 295 on a 10.5in rim (albeit I'm running a 35 sidewall). Turn in is very sharp and I've got a lot of steering feeedback. Still, I do wonder if it would be even better on a 11in wheel which is hard to fit in front on any F8X.
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      03-02-2024, 07:06 AM   #468
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Quote:
Originally Posted by RugbyBro View Post
I'm liking 295 on a 10.5in rim (albeit I'm running a 35 sidewall). Turn in is very sharp and I've got a lot of steering feeedback. Still, I do wonder if it would be even better on a 11in wheel which is hard to fit in front on any F8X.
I do get on the sidewalk more than I'd like. Even with significant front camber. I assume it's my suspension giving up and car rolling over. Would a wider wheel also help with this? I don't think I could go 11" wide at the moment. Maybe with an aftermarket suspension. Having an adjustable LCA helps. Increasing ride height a little, and playing with spacers, etc
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      03-04-2024, 04:32 AM   #469
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Great conversation and I appreciate everyone’s feedback. Sounds like a 10.5” square will be doable given my camber settings with a larger spacer, and running a 275/35 tire on the wider rim should continue to enhance traction and feel.

Sounds like the 295/30 tire will potentially result in slower time as that tire would be better fitted on an 11” wheel. A 285/35 may be a good compromise on 10.5” wheels. I switched to Toyo RRs (275/35), and would like to try the R7 Hoosiers next. Both of them come in the 275 and 285 sizes.
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      03-04-2024, 09:59 AM   #470
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Has anyone here directly compared a 275/40/18 with a 295/35/18 in the rear?
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      03-19-2024, 09:47 AM   #471
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275/305 30 profile 19" on M2C working.
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      03-19-2024, 10:56 AM   #472
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275/305 30 profile 19" on M2C working.
What tire? What width and offset on the wheels?
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      03-19-2024, 10:58 AM   #473
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Quote:
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What tire? What width and offset on the wheels?
RT660

Apex 19"s for M2C Brakes. running 12MM spacer from Bimmerworld in the front on extended lugs.
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