12-19-2020, 10:33 PM | #23 | |
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Drives: G20 M340ix; F30 328i msport
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12-20-2020, 08:09 AM | #24 | |
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Also a solo driver and similar experience with 38psi. Just swapped tires and found the the outer edges to have a tiny bit more tread left. Fronts at 32psi look about even. Im guessing the recommended pressure accounts for a possible maximum load (safety reasons) I now run 34-35 front 36-37 rear.
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2019 G20 330i RWD
2014 F30 328i RWD 2009 E90 328i RWD 2006 E90 330i RWD 2002 E46 330i RWD Last edited by alpinewhite3; 12-21-2020 at 09:46 AM.. |
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12-20-2020, 08:24 PM | #25 | |
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Drives: 2021 M340 RWD
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Thoughts?
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12-21-2020, 09:45 AM | #26 | |
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Couple of main takeaways - Never run above 40psi in any 18-19 inch performance tire. The ideal grip "band" is between 32-38psi for most performance tires. If you go beyond 40psi, you may end up with a tire that feels better since you are greatly enhancing steering response at the expense of overall grip. BMW recommends 32F 38R on their RWD 330i b/c their #1 goal is safety (from a liability perspective). My best guess is they recommend 38 on the rear b/c a higher pressure in the rear will prevent the sidewall from flexing too much and greatly prevent the car from oversteering. 32 on the front will keep it squarely planted at the limited with max grip available. I'm sure the toe/camber settings are calibrated to prevent oversteer too. I like to run 34-35 front 36-37 rear. 2 PSI difference. I found the 32 front made the steering a bit too dull. 38 Front is super sharp but i can feel the lack of grip. 34-35 is a happy medium. 38 rear is too high (a tiny bit too much center tire wear) so i run 36-37.
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2019 G20 330i RWD
2014 F30 328i RWD 2009 E90 328i RWD 2006 E90 330i RWD 2002 E46 330i RWD |
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12-21-2020, 01:15 PM | #27 | |
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Interesting on the recommended 38 rear though on the 330. Also agree they want to the car firmly planted but wow, 6psi difference is a lot if you ask me. Once Spring comes I will try some different psi's and let you know. Thanks for the info.
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09-07-2021, 10:03 PM | #28 |
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Need some help. Just installed new tires and computer says low pressure.
Sticker recommended: 32 front 38 rear Computer recommended: 34 front 42 rear I manually reentered tire size and still same numbers. Why different numbers btwn computer and sticker? |
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09-08-2021, 04:28 AM | #29 |
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I believe the on board computer also accounts for temperature, usually the sticker pressures are based on 15-20°C. Is it particularly warm where you are? What tyre temps is your car reading?
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09-09-2021, 06:31 AM | #32 |
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My M340i has Pirelli P7 run-flats with stock 225/40R19 square setup and the onboard monitor recommends 38/41 psi. It’s good for the highway, but the run-flat P7’s can really be jarring on low speed bumps or washboard roads when you have the sport suspension. I don’t really like the ride of these tires. I don’t have enough miles on it yet to assess how they are wearing.
When they swap tires on your car they should either read the QR code on the tire and use it to update the car’s computer, or they should manually enter the tire data. After that update the onboard system might recommend a different pressure than the pressures on your OEM sticker. AFAIK they never change the stickers. |
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04-05-2023, 04:47 PM | #33 |
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have PZ4 RFT 19" staggered and going on a road trip with 2 proper teens and their stuff in a wagon
setting pressure at 36 front 39 rear i am so confused since my subaru recommends 32 psi and the BMW door says 39/39 with 3 bodies and 44/49 with 5 bodies |
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