good wear this way also.
tire pressure
Thread Starter
Drifting
Joined: Feb 2008
Posts: 1,560
Likes: 4
From: Arlington texas
tire pressure
I got a low tire pressure warning yesterday on my way home. Luckily it wasn't a flat, all tires were a little low and one had just dropped enough to set off the warning. Stopped at an air pump and saw the door says 30 psi cold. Tires weren't cold but filled it to 30. Had a bad feeling about using their gauge and the instrument panel showed 40 psi. so I stopped in next door to auto parts store and bought another gauge it said 40 also. Anyway, I lowered them to 30 all the way around.
Took the car out today and forgot to check it cold but noticed after awhile that the car read 38psi while they were hot. Curious as to what hot psi your cars are at?
Took the car out today and forgot to check it cold but noticed after awhile that the car read 38psi while they were hot. Curious as to what hot psi your cars are at?
Instructor
Joined: Jul 2007
Posts: 176
Likes: 6
From: Golden Colorado
At mile high altitude, I fill them to 30 cold, I typically see 10% rise with lower temps <72, above that I've seen up to 20% at 100*. I run my DRs at the track at 25 cold (saves my driveline at the expense of 60 foot times) , then adjust them according to the temp at the track as needed.
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From: Zephyrhills, Florida
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13
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What I have found is that if you fill the tires to 30 psi cold, when they warm up they go to about 34 or so psi.
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Racer
Joined: May 2008
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From: Saskatoon
I'm sure the tire enginerds realize that the pressure increases as the tires warm up. That is why you alway check them when cold before driving anywhere. If you want to maintain your pressure closer to 30psi at all times, you can run nitrogen in your tires as it expands less than air due to temperature variations.
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