Check Those Tire Pressures

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09-09-2010, 07:58 AM

No HTwo O

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Check Those Tire Pressures

Wow, big air temp changes going on in the Chicago area. Check those tire pressures. I was down about 2-3 PSI from the mid-summer settings.

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09-09-2010, 08:43 PM

Parnelli

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what # do u keep the tire pressure at in this Midwest weather?

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09-09-2010, 10:00 PM

racer

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the rule of thumb I heard was for every 10 degree temp change, there is a 1psi change.

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09-10-2010, 10:56 AM

No HTwo O

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Quote:

Originally Posted by racer

the rule of thumb I heard was for every 10 degree temp change, there is a 1psi change.

Correct, for "dry" air.

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09-10-2010, 10:57 AM

No HTwo O

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Quote:

Originally Posted by Parnelli

what # do u keep the tire pressure at in this Midwest weather?

I am 36/40 in the Turbo (Kumhos on 18") and 32/36 in the Boxster (PS2's on 19").

Last edited by No HTwo O; 09-10-2010 at 11:17 AM. Reason: added tire and wheel info

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09-10-2010, 11:09 AM

dbf73

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34F/36R

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09-10-2010, 12:35 PM

LAT

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33F/38R Turbo
32F/36R NA

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09-10-2010, 03:50 PM

cgfen

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Quote:

Originally Posted by racer

the rule of thumb I heard was for every 10 degree temp change, there is a 1psi change.

beware PV = nrT !!!!!!!!

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09-11-2010, 07:26 PM

ronnie993tt

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I like 35/40 with Sport Contact N2's which is around what most guys on this thread run. I asked the Michelin guys at the Mosport Porscheplattz and they went on and on about how Porsche did extensive testing and we should be sticking to the pressures recommended in the manual......36/44 if I recall. My indy recommends the lower ear pressures too. What do you think?