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Old 05-31-2009, 09:27 PM   #1
operating engineer
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Default how many run to warm R Compound?

I got Hankook C70 on today, it was 72 degree and cloudy. The first two runs were a complete wash due to the tires not sticking at all. The third run started to warm up and started hooking up pretty good. Runs were 15 to 20 minutes apart and no co-driver. The afternoon runs were ok when sun started hitting the pavement and warmed up even more. Do you guys have that problem with A6 and 710 not hooking up at all on your first runs?
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Old 05-31-2009, 09:35 PM   #2
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You could add a few PSI to bring the tire temps up. Just a guess.... Do you know what the best operating pressure is? Do you know what the optimum temp should be of your tire? Do you have a way to measure tire and track temp?
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Old 05-31-2009, 09:48 PM   #3
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Pyrometer
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Old 05-31-2009, 09:52 PM   #4
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Optimum grip level is at 180 to 200 degrees according to Hankook website. I don't have a pyrometer . They feel great when they warm up, but it takes me a while to get them to temp.

Just looked at Hoosiers A6 operating temp from tirerack, 140-150 degrees for the A6 in an Autocross application.

Last edited by operating engineer; 05-31-2009 at 10:09 PM.
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Old 05-31-2009, 10:13 PM   #5
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Quote:
Originally Posted by UFOpilot View Post
Pyrometer
^ Thanks, I couldn't think of the name of it.

You'll also need someone to check the tires, front first, immediately after a hot lap.
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Old 05-31-2009, 10:34 PM   #6
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In the A6 and 710 grip starts coming in typically midway thru the first run. 2nd run will be much better. 3rd run will have the most heat, but similar grip to the 2nd run.

To achieve 180-200F is going to take more than 15-20 min between runs, thats quite hot.

The V710 gets greasy if you start a run above 120 and typically will be slower. The A6 tolerates much more heat and is still fast, to the point where I seldom spray them compared to the 710.
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Old 06-01-2009, 06:46 AM   #7
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Were these brand new tires? If so, your first run was loose due to scrubbing off the sticker and mold release. The 2nd run was loose cuz the tire may have still been cold, but heated up by the 3rd run, which seems to have felt good.

Tire size?
Tire age?
Car (ballpark weight)?
Pressures before/after each run?

I've always found my 'kooks to heat up really fast and need spraying before we'd consider it with V710's or A6's.

Jay

Last edited by Storm; 06-01-2009 at 07:05 AM.
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