Quote:
Originally Posted by auggiem3
How can you run your tires at a cold 35/36 on a track day?
My PS2s need to drop down to 20-22 cold psi to keep them below 40-42 hot psi on track runs.
I ran them at a cold 26-28 psi last year and tested to a scary 52 psi after two 20 minute track sessions on a mild day (60 degrees f).
If I would have started at 35, I would have well exceeded the maximum pressure and probably experienced a blowout assuming I didn't lose it from lack of grip...
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Just so everyone knows the usual 50 or 52 listed on a tire as "max" psi is a COLD psi value. 50 is not the max when it is a hot temperature. Not saying you run it to 50 cold but a tires "max" when hot is much closer to 75 psi range as they are pretty conservative when listing a max cold psi.
Also never heard so many people using "hot" psi measurements to guage tire pressure. Bmw specifies 35 psi cold on all 4 corners