Proper street tire pressure at the track

fawcett

Member

Sep 10, 2003

380

0

16

Cohasset, Ma

Oct 29, 2005

#1

• Oct 29, 2005

• #1

What psi should i run this weekend at epping? i have a set of dry weather only kumhos. they are 255 40 up front, 275 40 out bacck.
i used to run like 50 upfront and 18psi rear but i dont know if that was good or not. if it matters i have a six speed and 373 gears with like 280 rear hp and i weigh in at like 3300lbs. probably gonna leave the line anywhere from 2500 to 3500rpm
-fawcett

 

94Blue302GT

Member

Oct 20, 2003

704

3

19

Chicago

Oct 29, 2005

#2

• Oct 29, 2005

• #2

50 up front seems pretty high.
Also, the best way to find out if 18psi is the best for your tires and your combo is to do burnouts somewhere. If the patch is in the middle of the tires, you have too much psi. If you have lines on the sides, you need more psi.
I would then lose 2 psi for the track.

 

T

TMC

Founding Member

Jan 17, 1999

1,426

0

36

Chicago

Oct 29, 2005

#3

• Oct 29, 2005

• #3

You need to run more than 18psi on a street type low profile radial like that. I would start around 26psi and work you're way up from there until they work best. My experience is that 28-32 psi works good but every tire/wheel combo is a bit different.

 

SN95StangMan

New Member

Jul 5, 2003

1,292

0

0

Lynwood, CA

Oct 30, 2005

#4

• Oct 30, 2005

• #4

I would run 25 psi on my tires and that worked best for me. But every situation is unique and you should just test different pressures and find out.