Correct P.S.I
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Joined: Jan 2000
Posts: 23,478
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From: Chicago
Re: Correct P.S.I (systemoverload)
It depends on the car and the tire.
As a general rule, your best bet is to start with the tire pressure recommended by the CAR'S manufacturer (in the owner's manual and/or marked on the car's glove compartment, door jamb, etc). Then adjust upwards or downwards from there based on handling, tire wear, etc.
Recommendations are for COLD tire pressure (i.e. measured when the car has been sitting in the shade for at least a couple of hours). Don't forget that ambient temperature has an effect on tire pressure; every ten degree rise in temperature adds about 1 psi. So you can adjust for that if you measure pressure at a time when the temperature of the area where the car is is more or less than the temperature at the times you normally drive the car.
As a general rule, your best bet is to start with the tire pressure recommended by the CAR'S manufacturer (in the owner's manual and/or marked on the car's glove compartment, door jamb, etc). Then adjust upwards or downwards from there based on handling, tire wear, etc.
Recommendations are for COLD tire pressure (i.e. measured when the car has been sitting in the shade for at least a couple of hours). Don't forget that ambient temperature has an effect on tire pressure; every ten degree rise in temperature adds about 1 psi. So you can adjust for that if you measure pressure at a time when the temperature of the area where the car is is more or less than the temperature at the times you normally drive the car.
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Feb 16, 2004 09:25 AM