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Old 04-15-2011, 08:21 AM   #1
John W
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Autocross Tire Pressures

On Sunday, I will be autocrossing my Focus for the first time (although I have autocrossed on and off for the past 15 years) and am wondering what a good starting point for tire pressures would be.

My car is an 05 Focus SE with SVT shocks, struts and springs. It still has the stock front sway bar and no rear bar. The tires are Falken Ziex 912s, 195/60/15. Currently, the tire pressures are set 32 psi cold F/R.

The car is my daily driver and as it sits now, I know it will not be competitive. I just want to have fun and make the most of what I have.

Thanks in advance for any advice.


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Old 04-15-2011, 08:29 AM   #2
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When I run my Falken Ziex 912s, 195/60/15 I run front at 41-42 psi and rear 34-35 psi. Works for me I can carry enough speed thru the corners. To be honest this tires are not the best for Auto-x but for having fun they will do the trick.
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Old 04-15-2011, 09:43 AM   #3
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Thanks Rafal -- your advice is helpful!
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Old 04-15-2011, 09:47 AM   #4
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** Moved to AutoX Section **

Since this is more AutoX related, I bought it here.

For me, on Hankook RS3s I run 32-34 in the front and 28-30 in the back. This has been my fav and best runs. Of course this goes up as the heat goes on. My tire specs are 225/50 on 16s.

On my Yokohama S.Drives I ran 37-40 in the front and 34-37 in the back. Tire Specs 215/45 on 17s.

You want to have a good amount of tire touching the pavement when you are running or it will slide a bit.

PSI is a bit different per tire.

-Ray-
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Old 04-15-2011, 10:33 AM   #5
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Quote:
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Thanks Rafal -- your advice is helpful!
No problem mate, let me now if that worked for you.
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Old 04-15-2011, 12:08 PM   #6
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Start high, and then work your way down in pressure. With a 195/60, you'll be needed at least 40 in front I think.
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Old 04-15-2011, 05:07 PM   #7
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chalk the side of your tires, it's much easier to see where they are wearing.
as mentioned every tire and every surface will need different psi. also factor in the weather, on hot days the PSi will rise so you'll have to keep a close eye on it.
on my kumhos i run 35-38 in the front and about the same in the rear.
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Old 04-19-2011, 07:54 PM   #8
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I ended up running about 41 psi front/36.5 psi rear. Surprisingly, this even allowed my car -- with no rear sway bar -- to rotate a bit in certain sections of the course. Predictably, the tires didn't work particularly well. Not much grip and findable traction was in short supply. I ended up placing 7th out of 13 cars in ST, which I think is fine considering the tires and that the only upgrade to my car is SVT springs and shocks, which are really stock pieces anyways.

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Old 04-19-2011, 09:18 PM   #9
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wrong thread :)
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Last edited by GodLovesUgly; 04-19-2011 at 09:19 PM. Reason: i'm dumb.
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Old 04-20-2011, 10:01 AM   #10
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Quote:
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I ended up running about 41 psi front/36.5 psi rear. Surprisingly, this even allowed my car -- with no rear sway bar -- to rotate a bit in certain sections of the course. Predictably, the tires didn't work particularly well. Not much grip and findable traction was in short supply. I ended up placing 7th out of 13 cars in ST, which I think is fine considering the tires and that the only upgrade to my car is SVT springs and shocks, which are really stock pieces anyways.

YEah this falken s are not great for that kind of driving I had the same problem. Word on a street is that for ST class this setup is the best 15x7.5" with some toyo 195/50/15.
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