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      06-12-2017, 07:48 AM   #1
Docamok
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Ideal tire pressure?

I have 20 inch 343M wheels with MPSS which have been on the car for 4 months with approximately 4K miles. The recommended tire pressure per the sticker is 35 PSI. I feel the ride gets very harsh esp in warm weather after driving for a while on the crappy philadelphia roads. I tried going down on the tire pressure by 1.5 PSI, definitely helps but the steering feels much heavier at lower speeds. Don't know if this a MPSS issue and switching tires might help? What tire pressure do you guys have with your MPSS? Would appreciate any suggestions.
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      06-12-2017, 08:16 AM   #2
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Quote:
Originally Posted by Docamok View Post
I have 20 inch 343M wheels with MPSS which have been on the car for 4 months with approximately 4K miles. The recommended tire pressure per the sticker is 35 PSI. I feel the ride gets very harsh esp in warm weather after driving for a while on the crappy philadelphia roads. I tried going down on the tire pressure by 1.5 PSI, definitely helps but the steering feels much heavier at lower speeds. Don't know if this a MPSS issue and switching tires might help? What tire pressure do you guys have with your MPSS? Would appreciate any suggestions.
30psi.
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      06-12-2017, 10:41 AM   #3
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33 psi for me
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      06-12-2017, 03:42 PM   #4
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36-37 psi for every day. 38 psi driving long distance with full car. 30-35 on the street drives like the car has a flat tire.
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      06-13-2017, 08:10 PM   #5
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32psi for me. A bit of a less harsher ride from the 35psi that was in there.
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      06-15-2017, 07:28 AM   #6
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I think I'm on 34, I have yet to really experiment here, wasn't a fan of 32 when I was a little low, felt quite soft
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      06-22-2017, 07:33 PM   #7
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45 front, 43 rear best for me so far but still tweeking.
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      06-22-2017, 08:57 PM   #8
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pressure

40 front and back for me, I like it hard
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      06-23-2017, 09:39 PM   #9
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Quote:
Originally Posted by M eyedoc View Post
45 front, 43 rear best for me so far but still tweeking.
Hmm, that's rather high! Not experimented with such high pressures in the M5 but have tried that in my previous 750Li (19s with a much cushier ride btw). It definitely made it easier to maneuver at lower speeds and generally lighter on its feet but seemed a little wobbly when braking heavily at higher speeds.
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      06-23-2017, 10:52 PM   #10
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I came to those pressures by measuring tire temps at inner, outer and center tread. Gave the most consistent readings all around.
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