how much air when autocross ?
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
I started at 40 in the front and 35 in the rears with Supercar Runflats. The car pushed like a pig. The runflats have a very stiff sidewall and I guess they don't need as much pressure. I found the best was around 33 in the fronts and 32 in the rears. Car turned in much better.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Also, use some chalk and mark the sidewalls where it meets the tread. If the pressure is too low, the tire will roll over onto the sidewall and rub off the chalk. If the pressure is too high, it won't roll over at all. The trick is to use up the whole tread including starting to just go over the edges. I'm probably not doing too well describing it, but if you ask a veteran, they will show you what to do when you are at the autocross.
Burning Brakes
Joined: Aug 2008
Posts: 1,220
Likes: 3
and that will depend on things above as well as the tire you're using...e.g., a runflat probably doesn't need much more air than street pressure because of the stiff sidewalls, while another non-RF might need 10 more lbs
if you're new at it, err on the high side and worry more about your driving than a few psi in the tires
Burning Brakes
Joined: Sep 2007
Posts: 1,112
Likes: 179
From: Cedar Rapids Iowa
I was running stock 30 lbs (cold) but went to running 38F 36R (hot). It seems to handle better and provide less wear on the edge of the tires. Rollover checks are useful with regular tires, but I don't think you see much difference with the stiff run-flats.
Melting Slicks
Joined: Jun 2003
Posts: 2,637
Likes: 0
From: Acton MA
on my 05 i ran 36 F / 34 R.
this gave me a nice, slightly over steer feel. which I prefer.
Depending on how many runs you get, i would suggest starting at 36, do a run, and then go down a psi, then another and see if you get faster.
If this your first season, just put the tires at 35psi and drive. Lack of consistency will make it impossible to dial in the tires.
this gave me a nice, slightly over steer feel. which I prefer.
Depending on how many runs you get, i would suggest starting at 36, do a run, and then go down a psi, then another and see if you get faster.
If this your first season, just put the tires at 35psi and drive. Lack of consistency will make it impossible to dial in the tires.
Last edited by DarthStimpy; Jul 31, 2009 at 02:18 PM.
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