Quote:
Originally Posted by masraum
The rears on the boxster can change 6-7 psi on a single drive due to heat. The fronts usually only gain 4-5 psi.
And if the weather in the morning is in the 30s but the afternoon is in the 60s or 70s, the difference from cold tires in the morning to hot tires in the afternoon can be 10-15psi.
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If your tire pressure changes more than 10% from cold to hot in the summer, your tires are under inflated. If they change a lot less than 10%, they are over inflated. You want to start with the recommended pressure from the sticker in the door jam and then adjust if necessary using the above formula.