Tire Pressure Question
#1
Tire Pressure Question
So I used to run on 265/40R18 tires for autocross, but I've made the jump to 285/30R18 this year. The pressures that I ran for racing on the smaller tires were 36 psi front, 34 psi rear. I found those pressures to give me the traction that worked best for me. My question is should I run those same psi's on my wider and shorter tires, or should I run a different pressure? Thanks
#2
So I did some research on the SCCA forums and found that some people are running 42psi front and 36 psi rear. When I tried the pressures I found out that the front psi was way too high. I had major under-steer and I couldn't get any traction to save my life. I lowered the front psi to 38 and the car started handling like it should. Next race I'll try my old pressures to see if I get any more traction. Moral of the story, higher pressures tend to create lots of under steer.
#3
It is really dependent upon the tire. Last year we had three S197's competing locally in RTR. Several different brand tires over the season. Tire pressures were anywhere between 32/30 and 46/42. Otherwise pretty much same cars.
#4
That is a good point. I'm running the Dunlop Direzza ZII's this year. For the last two seasons I ran the Yokohama ADVAN Neova AD08. So both were extreme summer tires.
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M3hunter
S197 Handling Section
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09-05-2015 03:42 PM