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      10-12-2021, 02:59 PM   #1
HarrisWat
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42 PSI tire pressure?

i tried looking everywhere, but couldn't find a match for my question.

F80 M3 (non comp) 19 inch wheels.

just got my car back with a brand new set of Michelin Pilot Sport All Season 4 tires.

reset my TPM while leaving and they are at 43 across the board, so probably 42 cold.

is that way too high? i know the door seal shows 32 PSI and probably for run flats so don't know if it's different, but just seeing if y'all thought that was way too high. thanks!
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      10-12-2021, 03:25 PM   #2
Maryan425
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That seems pretty high. When I was on stock 19s with MPSS I kept the PSI near 35 or so.
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      10-12-2021, 04:03 PM   #3
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Quote:
Originally Posted by HarrisWat View Post
i tried looking everywhere, but couldn't find a match for my question.

F80 M3 (non comp) 19 inch wheels.

just got my car back with a brand new set of Michelin Pilot Sport All Season 4 tires.

reset my TPM while leaving and they are at 43 across the board, so probably 42 cold.

is that way too high? i know the door seal shows 32 PSI and probably for run flats so don't know if it's different, but just seeing if y'all thought that was way too high. thanks!
The F8X came with no run flats ever. Follow the door jam PSI, I elevate the PSI in cold weather season to avoid low pressure on extremely cold mornings, so I'd run 35-36psi all around personally.
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      10-12-2021, 04:12 PM   #4
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Just make sure they aren’t, say, I don’t know about 1.5 off from each other in the rear.
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      10-12-2021, 07:57 PM   #5
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TPMS should be reset at 32PSI cold.

Tomorrow morning lower all tires to 32 using a hand gauge and then reset TPMS again.
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      10-12-2021, 09:02 PM   #6
White340
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Man that must ride rough. The 666ms I can feel every psi above 32. Had it at 38 once and I couldn't drive down the block. It was so rough.

Funny enough my 340 had 19s and recommended psi was 38 all around. Rode smooth as silk with the adaptive suspension. Better than even my old Acura TL.
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      10-13-2021, 07:26 AM   #7
Shawn_M3 2018
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Who installed the tires? They should be able to tell you the PSI. I just installed the same AS4 tires on aftermarket wheels (19F/20R) and discount tire told me it would be 35 psi all around based on their system (load index etc)
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      10-13-2021, 09:14 AM   #8
tropicatango
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I run my m2 competition at 32 psi front and rear in the street

On track i target 35 psi hot maximum
( around 28 psi cold )

42 is too much.

In my car, too much tires pressure like around 40 psi makes the car slippery, handling is not confidence inspiring even in the street
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      10-13-2021, 11:47 AM   #9
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42 PSI is really high. Was the ambient temperature a hot day? I usually set my tire pressure to 31 PSI cold and on one really hot day my left run was reading 39psi and my other 3 were at 35 PSI.
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      10-13-2021, 12:16 PM   #10
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What kind of wheels?

My car was sold to me with 437Ms and run flats (non bmw dealer) and I had issues with the seal breaking on the rears with 275 tires. Had to run a higher psi for the leak to not happen. Whole issue was a headache.

Ultimately, it seems like the stiff sidewalls wouldn't stretch like non run flats which caused the issues
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      10-16-2021, 06:14 PM   #11
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This baffles me somewhat. Some of you guys must be like Cinderella. I have had 328s, 335s, M3s, 435Ms, 528 and 535 with M package and X5 535M. NEVER been able to tell the difference in ride or handling between 30 and 45 PSI.
The only thing I have ever noticed is the tire wear. Too low and it wears on the outside of tread. Too high and it wears in the center of the tread.
OP, go by the placard (sticker) on the door jamb. Never seen anyone worry about +-3 PSI. A lot of people will go by what is on the sidewall of the tire. FYI, that is the preferred "maximum" tire pressure, depending on the vehicle and anticipated driving style. A particular tire is manufactured for a variety of vehicles depending on weight. Vehicle manufacturers do extensive tests to determine what PSI that particular tire and size handles/wears best for that particular vehicle.
My tires have on the sidewall, 51 PSI. My doorjamb sticker says 32 PSI. Realistically, it can handle up to and above 75 PSI. THEN, you will notice a difference in ride.
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      10-16-2021, 06:42 PM   #12
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42psi is way too high, 32psi cold and that's that.

On my last trip back from Miami, I had a 17 hour trip in front of me back to St. Louis. Had just left my place, got on Dolphin Expressway, and the damned low pressure light comes on driver's side rear. It was going down fast too, about 1 psi every 10 seconds. Since Miami is the world capital of tire shops, I was able to limp it to one nearby just as it hit 10psi. I basically had a razor in the tire, no way to patch it so I wound up buying two new tires (amazed they had 295/30/20 PS4s in stock, but hey it's Miami) and I was back on my way in about an hour.

The reason why I post this in the thread is because obviously I'm now nervous driving back 1,250 miles on two near rear tires after what had just happened. I pop up the display to see the psi and damned if the two rears weren't set to 46psi! Nerves totally shot at this point I pull over and hit the valve and air is just screaming out of the tires hah. Put them down to 32, and drove the remaining 1,200+ miles home incident free.
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      10-17-2021, 02:23 AM   #13
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Recently here in SoCal, it's gotten noticeably colder after a punishingly hot summer. I was wondering why the suspension felt kinda sloppy (JRZ RS Pro3). I checked the tire pressure and they had dipped to 28 PSI. After I put PSI back up, everything was fine and dandy again.

I have a pretty cool and portable air compressor set up for my Off Road Vehicle that airs up or down all 4 tires at the same time relatively quickly. I know I'm probably more sensitive than most since I'm a total wannabe suspension nerd and I guess by extension, that includes tires.

One more thing... In my experience, every TPMS I've used on my M3 (6 different sets so far), NONE of them were accurate. All of them were off +/- 3-5 PSI. I only use the TPMS to ball-park the PSI temperature of the tires. I check the PSI with my air compressor's pressure gage and then a manual tire pressure gauge. For daily driving, I set the PSI to about 32 PSI cold. That puts me in the happy place.

Last one more thing I promise... I get super irritated about the driver's front tire since the PSI and temperature is always higher after you get going (thanks OCD). That poor heat exchanger at driver's front tire is really working hard. Good job radiator for doing your job well.
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