PSI for street tires at a HPDE Options

[Absolut Speed]

There have been several discussions regarding tire presure for autocross events on the board, but little mention relating to tire pressures for street tires at a HPDE.

Track: Road America
Temps: 50's/60's
Tires: Kumho Ecsta MX

So what would you say is a good starting point?

[00 Trans Ram]

I'd say around 40psi. I ran an autocross with speeds near 85 on MX's. I marked the tires with a grease pen to see what kind of rollover I was having. At 40, I was wearing just to the edge of the tread. These tires just don't have the grip to roll over too far; they slide first.

[trackbird]

In the manual for my Camaro (no, I didn't read it all), it says to use 38 psi or the max pressure on the tire sidewall (what ever is lowest) when driving for extended periods at speeds over 100 mph. Check the note on the tire pressure placecard on the drivers door. I read the warning about speeds over 100 mph and to see manual and had to read that part of the book. I'd guess that is a good starting point.

[Absolut Speed]

I never thought that the manual or any placard on the car would dare discuss travelling at those speeds!

[CMC#5]

Yeah really! That's histerical. I'd be surprised if they included that still for new cars.

[trackbird]

My car is a 2002, it is on the white sticker on the drivers door. Read it and laugh, I did. It is something like "Warning, if the vehicle is to be used for traveling at continuous speeds over 100 mph (where legal), see page xx in the owners manual". Or something like that. I was pumping gas one day and talking to my wife so I left the door open and that is when I read it. I had never looked before.