What tire pressure do you run?

BostonMike · 02-15-2021, 10:21 AM

Curious on what the optimum tire pressure is for regular street use?

BostonMike · 02-15-2021, 10:23 AM

Front Michelin PS4S 275/35/20
Rear Michelin PS4S 305/30/20

jzhu625 · 02-15-2021, 11:12 AM

35PSI on all

BostonMike · 02-15-2021, 12:51 PM

Cool. Thanks, jzhu625!

TopJimmy · 02-16-2021, 07:39 PM

Look inside your driver door...should say 32PSI. I lower my rears to 28 for straight line racing.

Rkt48 · 02-16-2021, 07:42 PM

I run 32 psi

AlterZgo · 02-16-2021, 07:51 PM

32/32 when cold as indicated on the door sill. Did this with my stock 19s as well as my 20s - both sets were PS4S.

N1rve · 02-17-2021, 12:56 PM

If I am checking at cold temp

31 PSI FL 32 PSI FR
32 PSI RL 32 PSI RR

If I am checking at 72 or above

34 PSI FL 35 PSI FR
35 PSI RL 35 PSI RR

I only run 1 PSI off on the front left because the heat exchanger adds an extra PSI during normal driving.

ptper · 02-17-2021, 02:02 PM

I can't remember which thread, but I've read that really bad things can happen if your tires are off by just 1 PSI.

N1rve · 02-17-2021, 04:36 PM

Quote:

Originally Posted by ptper

I can't remember which thread, but I've read that really bad things can happen if your tires are off by just 1 PSI.

There is always going to be variances, sun shining more on one side of the car, heat exchanger on the front driver side heating up 1 tire more. Temperatures aren't even the same across the board if you monitor your tire pressure via iDrive.

BostonMike · 02-18-2021, 11:25 AM

Interesting. Some of you guys run lower PSI than expected. I usually run 35/36. Maybe because I do a lot of highway driving. I thought it would be better at high speeds and better for gas mileage. Maybe I will try to run a little lower and see.

BostonMike · 02-18-2021, 11:29 AM

I thought lower psi would make it mushy in the corners, no?

TopJimmy · 02-18-2021, 02:20 PM

Quote:

Originally Posted by ptper

I can't remember which thread, but I've read that really bad things can happen if your tires are off by just 1 PSI.

LOL! That's a running joke we have... Some guy floored it and whipped out, but blamed one rear tire being off from the others by 1PSI.

bsmf8x · 02-18-2021, 02:54 PM

Quote:

Originally Posted by BostonMike

I thought lower psi would make it mushy in the corners, no?

Lower psi is better for straight line traction and bad for tread wear, not sure about cornering

N1rve · 02-18-2021, 03:03 PM

Quote:

Originally Posted by BostonMike

I thought lower psi would make it mushy in the corners, no?

The recommend PSI from BMW I believe is actually 32 PSI cold. If you drive at over 100mph it's a different PSI.

The lower PSI is better for traction and comfort too.

Too high a tire pressure wears out the center faster.

deeldoo · 02-18-2021, 08:51 PM

Quote:

Originally Posted by bsmf8x

Quote:

Originally Posted by BostonMike

I thought lower psi would make it mushy in the corners, no?

Lower psi is better for straight line traction and bad for tread wear, not sure about cornering

Lower PSI = worse gas mileage as the car drags across, better straight line acceleration to an extent, you will get better traction but you will have more drag. Cornering is worse, mushy tire.

Higher PSI you can hit higher speeds safely, better mpg, dogshit traction, harsh ride, twitchy ass car, might wipe out and die

fiveohwblow · 02-18-2021, 09:06 PM

I usually keep mine at 20 psi cause these cars are uncontrollable monsters in stock form so I got myself a set of beadlocks just to harness the beast. Just too much power for these skreets.

N1rve · 02-22-2021, 04:21 PM

Quote:

Originally Posted by fiveohwblow

I usually keep mine at 20 psi cause these cars are uncontrollable monsters in stock form so I got myself a set of beadlocks just to harness the beast. Just too much power for these skreets.

I hope this is a joke

2011ninja · 02-25-2021, 05:27 PM

Quote:

Originally Posted by ptper

I can't remember which thread, but I've read that really bad things can happen if your tires are off by just 1 PSI.

And I bet you guys are not checking your tire pressure the correct way.

This is how I check.

I get a live feed to my IPhone. If it's off by 1 psi car goes into limp mode.

irunalot · 02-25-2021, 06:12 PM

Quote:

Originally Posted by N1rve

If I am checking at cold temp

31 PSI FL 32 PSI FR
32 PSI RL 32 PSI RR

If I am checking at 72 or above

34 PSI FL 35 PSI FR
35 PSI RL 35 PSI RR

I only run 1 PSI off on the front left because the heat exchanger adds an extra PSI during normal driving.

I went 1 psi lower for my right front today and all 4 were at 33 hot. First time they have ever matched hot.

So I went cold 30 LF and 31 psi for the other three.

02-15-2021, 10:21 AM	#1
BostonMike Second Lieutenant 30 Rep 238 Posts Drives: Black 335 Join Date: Jul 2011 Location: Methuen iTrader: (1) Garage List 2017 M4 [0.00]	What tire pressure do you run? Curious on what the optimum tire pressure is for regular street use?
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02-15-2021, 10:23 AM	#2
BostonMike Second Lieutenant 30 Rep 238 Posts Drives: Black 335 Join Date: Jul 2011 Location: Methuen iTrader: (1) Garage List 2017 M4 [0.00]	Front Michelin PS4S 275/35/20 Rear Michelin PS4S 305/30/20
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02-15-2021, 11:12 AM	#3
jzhu625 Lieutenant 119 Rep 443 Posts Drives: f83 Join Date: Mar 2009 Location: Long island iTrader: (0)	35PSI on all
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02-15-2021, 12:51 PM	#4
BostonMike Second Lieutenant 30 Rep 238 Posts Drives: Black 335 Join Date: Jul 2011 Location: Methuen iTrader: (1) Garage List 2017 M4 [0.00]	Cool. Thanks, jzhu625!
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02-16-2021, 07:39 PM	#5
TopJimmy Major General 5445 Rep 5,137 Posts Drives: 2023 M3 Comp xDrive Join Date: Jul 2019 Location: Chester County, PA iTrader: (5)	Look inside your driver door...should say 32PSI. I lower my rears to 28 for straight line racing. __________________ '18 F80 Base 6MT \| '19 F82 Exec DCT \| '18 F82 Comp Exec DCT \| '23 G80cx
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02-16-2021, 07:42 PM	#6
Rkt48 Enlisted Member 52 Rep 34 Posts Drives: BMW F80 M3 Alpine White-SOLD Join Date: Feb 2021 Location: Missouri iTrader: (0)	I run 32 psi
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02-16-2021, 07:51 PM	#7
AlterZgo Lieutenant Colonel 1538 Rep 1,665 Posts Drives: 23 X3 M40i, 21 911S, 24 Taycan Join Date: Sep 2010 Location: Gilbert, AZ iTrader: (0)	32/32 when cold as indicated on the door sill. Did this with my stock 19s as well as my 20s - both sets were PS4S.
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02-17-2021, 12:56 PM	#8
N1rve Racecar Driver 1283 Rep 1,948 Posts Drives: BMW M4 Join Date: Mar 2019 Location: Beverly Hills, California iTrader: (2) Garage List 2019 BMW M4 [9.63]	If I am checking at cold temp 31 PSI FL 32 PSI FR 32 PSI RL 32 PSI RR If I am checking at 72 or above 34 PSI FL 35 PSI FR 35 PSI RL 35 PSI RR I only run 1 PSI off on the front left because the heat exchanger adds an extra PSI during normal driving. __________________ N1rve 2019 BMW ///M4 - Alpine White \| Sakhir Orange/Black Leather \| M-DCT \| Executive Package \| 19" Black 437M Wheels \| Carbon Fiber Trim \| Sunroof \| Active Blind Spot \| Heated Steering Wheel \| Adaptive M Suspension
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02-17-2021, 02:02 PM	#9
ptper Major 589 Rep 1,094 Posts Drives: '18 Avus Blue F80 Join Date: Sep 2016 Location: MD iTrader: (1)	I can't remember which thread, but I've read that really bad things can happen if your tires are off by just 1 PSI.
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02-18-2021, 11:25 AM	#11
BostonMike Second Lieutenant 30 Rep 238 Posts Drives: Black 335 Join Date: Jul 2011 Location: Methuen iTrader: (1) Garage List 2017 M4 [0.00]	Interesting. Some of you guys run lower PSI than expected. I usually run 35/36. Maybe because I do a lot of highway driving. I thought it would be better at high speeds and better for gas mileage. Maybe I will try to run a little lower and see.
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02-18-2021, 11:29 AM	#12
BostonMike Second Lieutenant 30 Rep 238 Posts Drives: Black 335 Join Date: Jul 2011 Location: Methuen iTrader: (1) Garage List 2017 M4 [0.00]	I thought lower psi would make it mushy in the corners, no?
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02-18-2021, 09:06 PM	#17
fiveohwblow Major 3633 Rep 1,397 Posts Drives: F15, E46 & M3, F82 Join Date: May 2016 Location: Desert SW iTrader: (0)	I usually keep mine at 20 psi cause these cars are uncontrollable monsters in stock form so I got myself a set of beadlocks just to harness the beast. Just too much power for these skreets.
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