Measuring tire temps at AX, What am I doing wrong? |
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Measuring tire temps at AX, What am I doing wrong? |
Joseph Mills |
Jun 15 2003, 08:49 PM
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#1
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on a Sonoma diet now... Group: Members Posts: 1,482 Joined: 29-December 02 From: Oklahoma City, OK Member No.: 39 |
At the last AX, after several runs, I went from 36# to 30# for the front tires (Hoosiers). At 32# and above, the inside was about 5 deg. hotter than the outside. Below 30# the outside started heating. At 30# they were about 117 deg. all the way across the tire. Good. And the car does not push.
The rear tires were about the same temps. However, even when I went as low as 26#, they are STILL about 6+ deg. hotter on the inside. And at 26# the car was starting to get a little loose, but easily controllable. Below are some things I've considered, but really, I don't know where to go from here. My car does have 1/2 deg more neg camber in the back than the front.... It was a short AX - around 38 sec's with some straight ahead driving - which would tend to heat the inside tread....? Maybe I need a faster/longer AX? Or can you only do proper readings on a skid pad or figure 8 only....? Could the engine heat up the inside of the tires? Usually spend 5 -10 minutes with engine idling and slowly creeping up the line.....??? My "pyrometer" is very cheap, but seems to be very reliable with repeated readings. Any ideas out there??? HELP! (IMG:style_emoticons/default/ph34r.gif) |
ChrisFoley |
Jun 16 2003, 07:23 AM
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#2
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I am Tangerine Racing Group: Members Posts: 7,937 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
Lowering the pressure to get the outside edge of the tire to heat up doesn't seem like a good idea to me. The tires work best within a certain pressure range. You will have to alter your car's camber settings to even out the tire temps, then fine tune the pressure so the middle is not more or less hot than the sides. A 5 degreee temp variation is not something you should worry about. At an auto X the temps won't get high enough to be real accurate anyway.
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