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steve - ain't the Smartire system great?
Anyway - i can't compare apples to apples - but at the end of my run at LSIR in the Porsche i was pushing 200 degrees on the tires. i was told by the people at Kumho (the only ones who responded to a long letter i wrote to several mfg's asking questions like this) told me that best traction on street tires is actually HIGHER than for track tires because the harder compounds need even more heat before they get increased stick.
You might try starting a few pounds LOWER and seeing if you can get higher temps - it MAY make a difference. Also, interesting that your starting and ending pressures were pretty close at LSIr and Thill - but the thill temps were so much higher. I would have expected a corresponding increase in pressure as well.
Finally - I hope someone some day does a long test with a skid pad, pyrometer and smartire. i would like to know how well the temp that smartire reads (which is the temp of air inside the tire) correlates to the tire surface pressure. It must lag, to some degree, and may reflect more brake/wheel heat - but evidently the tires are pretty good conductors, so it shouldn't be off too far in absolute terms.
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