Autocross Tire Pressure?
#1
I have been rebuilding my 86 Na 6 port engine for the last three weeks. I'm just about finished and the first Autocross race of the season is two weeks away!!!!!!!! Can someone tell me about the range of tire pressure I should start out with. I know it will vary given conditions at the race, but I don't want to show up completely unprepared. I've got 255x55x15 tires on 6.5"? wide aluminum wheels.
#3
Vosko, you're right, for street tires, most people raise up the pressure. I don't know about 50... I started at 40 and settled down to around 36 in the front, 34 in the back for my best runs. That was on a warm day with 205/40/17's. With my sidewalls so short, I didn't need to have the pressure jacked up too much.
#5
Originally Posted by amp' date='Feb 14 2003, 12:56 PM
run 40 initially...
use the chalk test to adjust thereafter..
use the chalk test to adjust thereafter..
#9
Originally Posted by Jerk_Racer' date='Feb 14 2003, 01:15 PM
255/55/15's on 6.5" wide rims? Are you serious or is that a typo? 205's are as wide as you want on a 6.5" rim.
#10
Yeah, Amps got it!
Start them out around 40, chalk it,
Drop it a few psi, until you notice chalk missing.
Yeah. . and about the 255, Yikes!
I'd be a little nervous about that, Unless those sidewalls are MEGA reinforced they're gonna role!
Start them out around 40, chalk it,
Drop it a few psi, until you notice chalk missing.
Yeah. . and about the 255, Yikes!
I'd be a little nervous about that, Unless those sidewalls are MEGA reinforced they're gonna role!