XPOST - Need advice on tire pressure w/ RE730s for track event.
05-30-2001, 02:23 PM
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XPOST - Need advice on tire pressure w/ RE730s for track event.
I've got 225.45.17 Re730s with the Eurosport springs and a 19mm rear Neuspeed swaybar set on the soft setting.
What do you guys recommend I go with for the track this weekend to get a little oversteer out of my car?
Thanx!
What do you guys recommend I go with for the track this weekend to get a little oversteer out of my car?
Thanx!
05-31-2001, 07:08 AM
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OK - is this a correct assumption???
Given the fact that at the track, and the tire temp will be WAY high, you should have MORE air in the back to get oversteer right?
I know that you can decrease traction by having either too MUCH or too LITTLE pressure. I'm thinking that, given the fact that tire temps are so high at the track, I'm better off going for a reduction in traction in the rear using the TOO MUCH PRESSURE approach.
I'm thinking maybe 38 front, 40 rear or maybe a 3 PSI spread. Thoughts?
I know that you can decrease traction by having either too MUCH or too LITTLE pressure. I'm thinking that, given the fact that tire temps are so high at the track, I'm better off going for a reduction in traction in the rear using the TOO MUCH PRESSURE approach.
I'm thinking maybe 38 front, 40 rear or maybe a 3 PSI spread. Thoughts?
05-31-2001, 07:21 AM
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On a S4/A4, most of the weight is in the front
When driving on the track, the front tires will gain a lot more psi when all the tires warm up since they do a lot more work. I think the 35/38 cold will probably be 40+F/40+R after a few laps and the spread should be very small.
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05-31-2001, 07:39 AM
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Good point - forgot about that. I'd like to have more pressure in the rear than the front though.
Maybe cold pressures of 36F, 41R??? OR do you think that's too much difference?
05-31-2001, 07:47 AM
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I ran 38/40 with my RE730s during autox.
It wouldn't oversteer much except in really tight corners if you got on the gas early. But it was balanced.
I now run Kumhos which are totally different. They require 44/38 to get the same balance. But I ran them at the track at TWS and they were decent. Not as good a steering response as the RE730s but more predictable on the track.
-Dave
I now run Kumhos which are totally different. They require 44/38 to get the same balance. But I ran them at the track at TWS and they were decent. Not as good a steering response as the RE730s but more predictable on the track.
-Dave
05-31-2001, 08:46 AM
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Re: Good point - forgot about that. I'd like to have more pressure in the rear than the front thoug
I see you have a 19mm roll bar. That might be a bit too much oversteer. I have H&R C/Os(430lb/in F and 460lb/in R) and a 19mm sway bar. With street tires during AutoX, I have to run 45F/38 to 39R or I'll get too much oversteer. When the fronts warm up I have to bleed the pressure or I'll start to understeer. I'd start off with a 2 to 3 psi spread, something like 38F/35R or 38F/36R. When the tires warm up you should have pretty Neutral handling just becareful when they're cold.