Street tires will probably put on 5 to 7 lbs (maybe more if you're hard on the tires) when they heat up on track. If you want to run say 40 psi, set 'em at 35, and take it easy on track while they heat up (2 or 3 laps).
After your 1st session, when you come off track, immediately check the pressures, and set them where you want them when they're hot. You will of course have to re-warm the tires at the start of the next session.
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