Tire Pressures for 997

[rlips44]

Hello everyone,

New here, just took delivery of a 2008 CS. I notice the tire pressures are set (cold) to exactly the door sticker recommendations, yet the on board system is recommending to release 4 PSI per tire.

I checked the pressures with my gauge, and they match what the computer is reporting. I have it set on 19", summer tires, partial load and the outside air temperature is about 50. I also noticed the manual said the ire pressures are calculated at 68F, could the 4 PSI be related to the difference in temperature, and do you think it would hurt to deflate the tires?

Tires are OEM Bridgestones (Tread wear 140!!!!).

Thanks in advance for your help

[White987S]

Congrats on the new car! Good job checking the tires pressures.

Well, the general rule for the effect of temperature on tire pressure is a one (1) pound change per 10 degrees (F) of temp change. So, no, the 4 PSI difference you are showing is not temp related (50 vs 68).

Recommended tire pressures have been discussed a lot here, and doing a few searches will yield you a lot of good info from other drivers.

Use a good quality, digital, tire pressure gauge. This should be your reference point.

Make sure you follow the proper engine & car brake-in procedure stated in your owners manual.

Edited November 4, 2007 by White987S