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thstone · 09-23-2017, 11:06 AM

As The Rad King mentioned, the correct tire pressure needs to achieve two different goals at the same time: proper inflation (even pressure across the width of the tire/proper roll in corners) along with optimizing tire temperatures.

The best way to get the inflation pressure correct is to use the sidewall markers (little triangles) to detect how far the tire is rolling over in corners. Decrease pressure if wear is not close to the markers (to let the tire rollover more) or increase pressure if wear is past the markers (to stiffen the tire and reduce rollover).

Then use a pyrometer to measure tire temps and adjust pressure as needed to get the tire temp to the optimal temp range.

Here is a good tutorial: Using a tire pyrometer-949 Racing

Here is an example of my tire temps from a testing day. We took three measurements across the width of the tire for each tire:

09-23-2017, 11:06 AM	#16
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	As The Rad King mentioned, the correct tire pressure needs to achieve two different goals at the same time: proper inflation (even pressure across the width of the tire/proper roll in corners) along with optimizing tire temperatures. The best way to get the inflation pressure correct is to use the sidewall markers (little triangles) to detect how far the tire is rolling over in corners. Decrease pressure if wear is not close to the markers (to let the tire rollover more) or increase pressure if wear is past the markers (to stiffen the tire and reduce rollover). Then use a pyrometer to measure tire temps and adjust pressure as needed to get the tire temp to the optimal temp range. Here is a good tutorial: Using a tire pyrometer-949 Racing Here is an example of my tire temps from a testing day. We took three measurements across the width of the tire for each tire: Attached Images __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor Last edited by thstone; 09-23-2017 at 03:43 PM.