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Old 05-17-2007, 12:26 PM   #1
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Question Tire pressure's for track tires

Just bought some track tires. Falken AZENIS RT 615. 225/45 17 & 245/45 17 . What would be a good tire pressure's to start with?

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Old 05-17-2007, 12:35 PM   #2
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Your starting point should be the same tire pressures that your car requires now. The "car" dictates the pressures...not the tire manufacturer.

Then make 1/2 to 1 pound adjustments up or down to get the handling characteristics (over steer, under steer or near natural) you most desire.
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Old 05-17-2007, 08:15 PM   #3
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Check with the tire manufacturer, or maybe tire rack (not sure if they sell the Falken tires)

How is it that the car dicates the pressure? The tires will dictate the pressure on race tires. Kumho says you should be arond 38 hot, Toyo is somehting less than that, Hoosier's (I believe as I have never run them) like to be in the high 20's.

Absolutly the tires will dictate pressure, not the car.

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Old 05-18-2007, 03:05 PM   #4
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Suggest - IMHO of course and there are other opinions around too
1. mark the tire with chalk on the roll over edge point (some tires have a mark on the tire for this purpose)
2. start with the pressure 5 PSI higher than street use (Car Manufacture's PSI)
3. after first several laps and temp is up, check chalk mark to see where the roll over point is located on the shoulder/tread interface
4. reduce the PSI until the rollover point is at the exact edge of the tread
This assures you are using all the tread for traction

Good luck,
Ed

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Old 05-18-2007, 03:10 PM   #5
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Consider any manufacturer guides about "ideal" pressures or temperatures.

My boxster indicates stock pressures of 29F 36r.

When I put on my RA-1s, I started at 34 front and rear, knowing that 38 hot was a nice pressure from previous RA-1 experience.

So, car, tire and driver preferences all feed into determining tire pressures.

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