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Old 09-01-2010, 04:18 PM   #1
kyledupreez
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Default What PSI do you run?

So I was putting air in my tires today, and thought maybe I'm putting too much in? So I thought I'll see what everyone else runs. So I'll start with mine

Max: 50psi (says on tires)
I run: 42-45psi.

Should you use run different psi in winter then summer? Or does it not make that much difference?

Thanks,
Kyle
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Old 09-01-2010, 04:47 PM   #2
06HAWKMAN
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Every tire is different and recomends different tire pressure, that being said I usually run 5-10 less than max for dd and a little less than that for a grippier feel
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Old 09-01-2010, 05:03 PM   #3
kyledupreez
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^ that's what I do. I just wondered if maybe I was doing it wrong. Ha like my dad told me that when I got my first car and I never questioned it.
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Old 09-01-2010, 05:44 PM   #4
WillieBill
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wow, that seems awfully high. Look at the sticker in the door frame of your car. For example, on the wrx it recommends something like 32F/29R with 16" wheels, and 33F/32R on 17". I generally run what the car company recommends.
As for summer vs winter, just check and fill them because they lose pressure as the temp goes down.
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Old 09-01-2010, 05:52 PM   #5
kyledupreez
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Well my tires say max is 50psi and I put it at 42psi this morning. I've had them at 45psi but the pump I was using was taking too long and I got impatient. On my jeep I run the recommended psi I was 36psi and I went through a set in 10,000 miles (supposed to last 30,000) and since then I run 5-8 under the max psi and wear seems to better. May not be as grippy. But for a dd I don't really want sticky. The harsher ride is the down side.
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Old 09-01-2010, 06:02 PM   #6
medamullet
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look in your door jam, that's what I run
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Old 09-01-2010, 06:03 PM   #7
kyledupreez
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^Even on your race tires?
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Old 09-01-2010, 06:03 PM   #8
WillieBill
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the question isn't really what is the max possible pressure in the tire, the question is what does the car manufacturer recommend for their vehicle. If you overinflate tires, they will wear faster in the middle as they balloon out. The anecdotal evidence on the jeep probably has more to do with the brand and age of tires, awd/4wd system, driving habits and the like than specific pressure.
I believe that the STi is supposed to have 36F/30R, so I would stick closer to that, maybe 38F/32R if you want to bump it up a bit.
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Old 09-01-2010, 06:06 PM   #9
WillieBill
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Here is some info from tirerack on under/overinflation.
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Old 09-01-2010, 06:09 PM   #10
fourmicah
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On my STI and WRX I always ran 35-36 PSI. The reason being, at 32 PSI the tires felt soft and washy when I went around corners. You could feel the tire roll on the sidewall because the tire pressure is lower. I've never run the tire pressure as high as 42 PSI, just because I never seemed to see a benefit of doing so. At an event or track I could see the benefit, but not on the street. For me there was a noticable difference between 32 and 36 PSI in terms of feel. I decided to leave it there and the wear was still on par with the warranty and they didn't wear any quicker.
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Old 09-01-2010, 06:10 PM   #11
kyledupreez
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^ I'll read that tonight. Busy doing "homework" seems everyone says run recommended I was wrong! haha =( possibly...
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Old 09-01-2010, 06:13 PM   #12
WillieBill
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that's why you ask on a car forum!
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Old 09-01-2010, 06:33 PM   #13
Euclid
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I usually run 2 psi up from what the door placard says. So on my Legacy I run 36f/34r, and 35f/34r on the sti.
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Old 09-01-2010, 06:42 PM   #14
kyledupreez
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so my next question is why less on the rears? i know the fronts do the steering, but its awd car, and if you wanted equal wear wouldnt you run the same? or is the way i understand tire wear skewd?
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Old 09-01-2010, 06:46 PM   #15
soundsofsnow
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I run 45 psi. Stretched. Low profile. And stiff suspension. Otherwise I'd ruin a rim.
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Old 09-01-2010, 07:12 PM   #16
WillieBill
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Quote:
Originally Posted by kyledupreez View Post
so my next question is why less on the rears? i know the fronts do the steering, but its awd car, and if you wanted equal wear wouldnt you run the same? or is the way i understand tire wear skewd?
I believe it is because of the weight of the engine in the front.
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Old 09-01-2010, 07:59 PM   #17
08WhiteRex
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Quote:
Originally Posted by kyledupreez View Post
^Even on your race tires?
On Slicks you go out on track, cold, at around 24 psi.
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Old 09-01-2010, 09:25 PM   #18
bhhamblin
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38psi on the street for me.

on race tires i run about 22psi
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Old 09-01-2010, 10:47 PM   #19
Anub1s
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32/32 driving on the roads, as are recommended by the factory, and I get the best response from the tires for street driving. I stagger them to 36F/38R at autox. Cold measurements BTW.
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Old 09-01-2010, 11:28 PM   #20
kyledupreez
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^ id assume that would be a given. althought when you assume... exactly. haha wow really low 20s for slicks? what do they get up to once you have heat in them?
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Old 09-02-2010, 12:10 AM   #21
08WhiteRex
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Adjust it to 32 optimally.
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Old 09-02-2010, 12:15 AM   #22
ashergrey
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Quote:
Originally Posted by fourmicah View Post
On my STI and WRX I always ran 35-36 PSI. The reason being, at 32 PSI the tires felt soft and washy when I went around corners. You could feel the tire roll on the sidewall because the tire pressure is lower. I've never run the tire pressure as high as 42 PSI, just because I never seemed to see a benefit of doing so. At an event or track I could see the benefit, but not on the street. For me there was a noticable difference between 32 and 36 PSI in terms of feel. I decided to leave it there and the wear was still on par with the warranty and they didn't wear any quicker.
This has been my experience as well. Sweet spot for street on my WRX has been right around 35.
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Old 09-02-2010, 09:37 AM   #23
kyrosnick
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Quote:
Originally Posted by medamullet View Post
look in your door jam, that's what I run

+1

Make sure you got an accurate gauge. My brother killed a set of tires. His gauge was +5psi off. So he wanted 35psi and was running 40psi. The centers went bald quick.

My honda and vette both say 30psi cold front and rear so that is what they get.
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Old 09-02-2010, 11:49 AM   #24
aclver1
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Depending on the tire, but my street NT-05's i run 36 front 34 rear and when i run them on track i run 28 front, 26 rear. My snow tires i run usual about 35 all around and when i had track tires i would run 24 all around. Different tire manufacturers and sizes seem to make a big difference. Usually when I stay close the Subaru's recommended pressure they will wear good.
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