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Old 06-13-2008, 07:51 PM   #1
Scooby Newbie
Member#: 172610
Join Date: Feb 2008
Chapter/Region: Tri-State
Location: Rockland NY
2008 STI

Default Recommended 08 STI Tire Pressure

Just picked my car up from dealer for its first visit. Running stock BBS rims with stock Dunlop tires. Car rode better than when i dropped it off. I was running at recommended pressure in door jam but it appears they pumped the pressure up to 42 front and 40 rear. What are you guys running at for street driving?
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Old 06-13-2008, 08:31 PM   #2
Back Road Runner
Scooby Guru
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
2004 Forester STI


Test it. Run from about 30 psi up to max (assume 51 psi) in small increments of maybe 5 psi. Look for a couple things. One, if the pressure is too low, the tires will feel a little squishy. You want to be above this point. Two, if the pressure is too high, the tire may balloon up and start running only on the center of the tread. The steering will lighten up, and the whole car will start to feel a little skitish/darty because it's only running on the center area of the tread. As well, if the pressure is too high, the tires can stiffen up too much and start to get a little extra bouncy over bumps in the road, more thump, thump, and you being able to feel the tire leave the road surface. You'll want to be below this too high range and above the too low range. Where this is depends on the tire and your personal preference some.
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