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09-05-2007, 03:26 PM
George,
You ask a very interesting question...
My Boxster has 17 in. TOYO RA1's on it now. I run them at 37 psi front and 39 psi rear HOT. To achieve these #'s, I start the fronts at 24 and the rears at 26. Sounds crazy but if I go too high when cold, then I am way in the 40's and the car handles for shite as Larry explained.
Watch the tire wear after each session and check the pressures every time. As I have found out, if my tires are overinflated, the outer edge of the front tire rolls under and the car feels like I am snowplowing in the corners.
It is a constant measurement, depending on the day temperature, how long you are on the track and how hard you are driving (plus other factors).
Good luck! The fun has just begun!
-Graham
You ask a very interesting question...
My Boxster has 17 in. TOYO RA1's on it now. I run them at 37 psi front and 39 psi rear HOT. To achieve these #'s, I start the fronts at 24 and the rears at 26. Sounds crazy but if I go too high when cold, then I am way in the 40's and the car handles for shite as Larry explained.
Watch the tire wear after each session and check the pressures every time. As I have found out, if my tires are overinflated, the outer edge of the front tire rolls under and the car feels like I am snowplowing in the corners.
It is a constant measurement, depending on the day temperature, how long you are on the track and how hard you are driving (plus other factors).
Good luck! The fun has just begun!
-Graham
04-GT3, 04-GX470 (Tow vehicle)
Gone, but not forgotten:
89-911 3.2, 00 Boxsta, Ducati 900SS (93), Benelli 900, BMW K100LT, BMW K75S, BMW R69/5