What is your Tire Pressure? - The Unofficial BMW M5 Messageboard (m5board.com)

ajcut7 · 19th August 2007, 18:30

I had low air in one of my tires yesterday and was curious what psi you guys keep your tires at? My rear tires were at 35psi as they were from the factory, this is for everyday driving, not for track use.

///M6 HAMANN · 19th August 2007, 20:04

my front tire is 40psi
and rear 35psi and i got Ps2 Tires

RussRamz · 20th August 2007, 00:53

The only reliable way to determine tire pressures is to use a thermocouple thermometer to read tire temps and then adjust pressure. Using the manufacturer's recommendation is fine if you are not going to track your car.

Demon_M6 · 20th August 2007, 02:20

I set all the tires at 30PSI, Low but the car rides comfortable than any higher
pressure. any down side to this other than gas mileage?

Wayward · 20th August 2007, 02:56

Demon,

I won't recommend here (you should do whatever provides the most confidence), but I will say that I run my pressures a few PSI higher for the oem Contis. 33/36 is the full load max recomendation. Personally, for normal driving, I run at 2 under all around.

RussRamz · 20th August 2007, 08:11

For my high speed runs, I ran the tire pressure at the maximum recommended pressure in the owner's manual. For the track, I run at 2 psi under. I don't have a thermocouple thermometer, but have seriously considered it.

Demon_M6 · 20th August 2007, 14:16

Quote:

Originally Posted by Wayward

Demon,

I won't recommend here (you should do whatever provides the most confidence), but I will say that I run my pressures a few PSI higher for the oem Contis. 33/36 is the full load max recomendation. Personally, for normal driving, I run at 2 under all around.

Thanks wayward but why 2 psi below? My HRE's are a week away with PS2's 20" what do u guys recommend? Sent from my iPhone

deknight · 20th August 2007, 19:58

It depends on your setup or what you want your set up to be. Since the car is already set up for understeer stock, I set mine at 37 in the rear and 34 in front to offset that and get a more neutral set up. If my car was neutral already I would set equal pressure all around.

Demon_M6 · 20th August 2007, 21:17

Quote:

Originally Posted by deknight

It depends on your setup or what you want your set up to be. Since the car is already set up for understeer stock, I set mine at 37 in the rear and 34 in front to offset that and get a more neutral set up. If my car was neutral already I would set equal pressure all around.

Sorry I don't mean to hijack the thread

But I got H&R Springs so the car is even leveled front and rear

33 or 35 all around?

Wayward · 20th August 2007, 23:12

One of the best things you can do would be to experiment with different setups, whether working to counter understeer as dek said, or simply to find your preferred balance between comfort and handling.

Among the best ways to do this on the road is to experiment with a stretch of road that you're familiar with. You could run one setup for a few days try another for a few days. As unscientific as this sounds, it should benefit. Be sure to keep as many variables (damper, dsc, shift settings, etc.) the same during your runs.

deknight · 20th August 2007, 23:32

Quote:

Originally Posted by Demon_M6

Sorry I don't mean to hijack the thread

But I got H&R Springs so the car is even leveled front and rear

33 or 35 all around?

If the temperatures out there are really hot like high 90's to 100 F then go with 33. It is funny I set cold tire pressure at 34 in front 37 in the rear. When I got back from a weeks vacation and got back in the car my TPM told me I had low pressure in my tires. When I checked them every tire was exactly 3 psi lower. I was also alot cooler that day it got to 60 F in the morning when usually it has been around 77 F. No air leaked out it was just so much cooler that I lost 3 psi.