I run 30psi in the front and 28psi in the rear when the tires are cold and I have the non-runcrap GS D3's. Im sure others will post what psi they run.
Tire Pressure Question
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Drifting
Joined: May 2006
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From: Aliso Viejo So. Cal.
Tire Pressure Question
My neighbor and I have been kicking around a seemingly easy tire pressure question. I say if one is running stock tires from the factory (or their direct replacements), one should use the manufactures recommended pressures as stated on the label inside the drivers door. On the other hand, if one replaces his stock tires with anything other than stock one should use the pressure indicated on the replacement tire (for example, I ditched the GY EMTs for GY-GSD3s and now use the tire pressure as called out on the tire not the door label). Thanks in advance for your help guys'. 
Melting Slicks
Joined: Feb 2006
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From: Des Moines Iowa
I believe your neighbor is more correct than are you. I've always thought the pressure indicated on the tire is the manufacturer MAXIMUM pressure for the tire, NOT the recommended tire pressure for the tire on THE specific automobile. If you are going to do one or the other, I'd always go with the pressure recommendation made by the auto manufacturer and printed on the driver's door. Having said that, I am one of those who currently are running more than the recommended air pressure in my original size Michelin Pilot Sport A/S ZPs. (I'm running 33 lbs. cold, not the recommended 30 lbs. in hopes of limiting tire wear in the middle of the RUN FLAT tire due to 'tire squirm'.
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From: Hurricane Alley
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From: Not on either liberal coast.
I use the recommended 30/30# front and rear oem tires/wheels on my Z16 in northern AZ. The car is used on weekends on twisty mountain roads @ 100-150 round trips @ 5,200 ft altitude. I'm getting good tire wear with no abnormal tire behavior.
I'd think that if you change to a "completely different size wheel & tire" package, the oem recommendations would still be the best starting point for adjustments up/down based on the engineering of the car and the maximum occupants weight. It's all experimentation and to much variation in either direction will probably cause premature $$ tire wear, even if the ride seems fine.
I'd think that if you change to a "completely different size wheel & tire" package, the oem recommendations would still be the best starting point for adjustments up/down based on the engineering of the car and the maximum occupants weight. It's all experimentation and to much variation in either direction will probably cause premature $$ tire wear, even if the ride seems fine.
Last edited by hotwheels57; Oct 16, 2007 at 04:36 PM.
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I believe your neighbor is more correct than are you. I've always thought the pressure indicated on the tire is the manufacturer MAXIMUM pressure for the tire, NOT the recommended tire pressure for the tire on THE specific automobile. If you are going to do one or the other, I'd always go with the pressure recommendation made by the auto manufacturer and printed on the driver's door. Having said that, I am one of those who currently are running more than the recommended air pressure in my original size Michelin Pilot Sport A/S ZPs. (I'm running 33 lbs. cold, not the recommended 30 lbs. in hopes of limiting tire wear in the middle of the RUN FLAT tire due to 'tire squirm'.
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I have always run the tire pressure recommended on the door label, regardless of the brand of tire on the car. No abnormal tire wear has been noticed.