Urgent- Tire pressure for HPDE vrsus for AutoX

[phenryiv1]

 

I have autoXed the 2.5i with relatively consistent tire pressures, but after 2-3 runs, pressures climb and I lose grip.

 

How should my HPDE session tire pressure (at start) compare to my AutoX pressure?

 

I run around 42F/40R for autoX.

 

My track session will be around 20 minutes.

 

TIA

 

(PS- the event is TOMORROW!!!)

 

[SubyShop.com]

In general I start with lower pressures taking it easy the first lap or two to get the brakes and tires up to temp. After a session I check the pressure and if it is way too high I will drop a few psi out. Last event I did I ran 34 PSI and it didn't deviate from that value much at all (nitrogen fill and super stiff sidewalls). What tire are you running?

-Franz

[phenryiv1]

In general I start with lower pressures taking it easy the first lap or two to get the brakes and tires up to temp. After a session I check the pressure and if it is way too high I will drop a few psi out. Last event I did I ran 34 PSI and it didn't deviate from that value much at all (nitrogen fill and super stiff sidewalls). What tire are you running?

-Franz

215/45/17 BFG G-Force T/A

[wpmarky]

I start at 36 with cold tires, after the run it's usually around 40-42 when the tires get hot.

[FPerron]

I run the same tires as you but 245/40/17, and I start with 32 and end up with 40 after 4 or 5 laps.