Autocross Tire Pressures, Kumho Victor Racers |
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Autocross Tire Pressures, Kumho Victor Racers |
EPK |
May 26 2003, 10:54 AM
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#1
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Newbie Group: Members Posts: 20 Joined: 26-May 03 From: Victoria B.C Member No.: 740 |
[FONT=Times]Hi 914 Guys
I'm chasing tire pressures due to a recent switch to the Kumho Victor Racers. I'm wondering what sort of tire pressures are being used for Autocross on your 914's. Don't want to know about racing pressures just AutoX. I realise that different shocks, sway bars, torsion bars are going to come into play but I'm looking for "ball park" figures. |
EdwardBlume |
May 26 2003, 11:08 AM
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#2
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914 Wizard Group: Members Posts: 12,338 Joined: 2-January 03 From: SLO Member No.: 81 Region Association: Central California |
I was running cold 35-36 (I think max is 44) on those tires. Now I run cold 28-30 with better results. I think you get better traction with slightly lower pressure.
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J P Stein |
May 26 2003, 11:13 AM
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#3
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
I've ran as low as 28-26 cold, f to r. Under 30 is a good ball park number. They love negative camber.
-2 at both end if you can swing it. |
URY914 |
May 26 2003, 02:47 PM
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#4
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,147 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
I run the same tires but I'm way down at 23-26 psi. The surface we run on is slick and of course with a car that weights less than 1,580 pounds, I gotta run then low to make them work.
Paul |
Demick |
May 26 2003, 06:54 PM
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#5
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Ernie made me do it! Group: Benefactors Posts: 2,312 Joined: 6-February 03 From: Pleasanton, CA Member No.: 257 |
I've had the opposite experience. I used to run 30psi cold all around. Now I run closer to 34-35psi and I like it better. Best advise is probably to start somewhere around 30, and then play with them up and down to see what works best for you. Of course, this is for autox where your tires don't have a chance to heat up. On the track, you need to start lower and target a 'hot' pressure.
Demick '74 2.0 |
mskala |
May 26 2003, 07:16 PM
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#6
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
Somebody correct me if I'm wrong, but in AX there's
usually something else to be concerned about compared to big tracks. Where we are we run a lot of slaloms, and I think sometimes you can do better on that kind of course by overinflating a little, to make the car respond faster, at the expense of a bit of grip. When you do a bunch of fast maneuvers I think you want the car to bite quickly. Also I haven't done a lot of experimenting with the Kumho pressures, but I run 35 all around, and keep it there if they heat up (long courses without huge time between runs). Mark S. '70 914-6 |
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