Quote:
Originally posted by 5Gen_Prelude
Actually no, even 5 psi will degrade your performance of your tires. And the highway deal is opposite (to a very small degree). The reason behind it is that your psi will increase if you are travelling for long distances. Why? The tires heat up and don't have time to cool down like normal. They will increase in psi by up to about 3 psi on long highway trips, thus over the recommended amount. Increase the tire presure for long highway drives simply compounds the problem.
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Performance DOES go up when you increase tire pressure. It will flatten out the tire and change the slip angle of the tire. That is why when you are autoxing or road racing, you want higher pressures up front to get better grip up front than the rear to get some oversteer. I know about the pressure increase, but it happens everywhere, not just the highway. The increase in pressure is constant however and does not keep inflating once it reaches 3-5 psi. It will not go down until it cools down. Even the sun will keep the pressure up or increase pressure when sitting for a while.
The safety concerns with increasing pressure when you drive faster have to do with unseating and rolling over the tires. Its even printed in the owners manual if you want to double check.
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'94 Porsche 968 - National PCA HPDE Instructor
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