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I'd do what you normally would up 4 psi.
If straightline stabilty is poor then come don in pressure.
If the handling is greasy you also have to drop pressure.
I'd keep front to rear pressures at the same ratio as street until you find optimum cold race pressures, then fiddle with the F/R ratio to adjust front end turn in bite .
Get a tyre pyrometer asap too.

The lighter the car, the less increase in pressure. In a 1300lb car, pressures for track usage would be the same as street, except you raise rear pressures slightly 1-2 psi for more front bite when carrying a passenger as a passenger tends to increase rear grip.
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