tyre pressure for track day?

[SpoonS]

Would 45 psi hot be too high for not enough of the tyre to be in contact with the ground? I thought 40 was around the limit but correct me if I'm wrong. Happy to learn.

With street tyres, you want to keep the pressure high like that because the sidewalls aren't as strong as say a semi slick. Ive seen people run with 40, and have shredded their tyres. I guess it all comes down to what brand/model tyres you use. Also, that american pro driver guy that goes to the circuit club track days told me to run it at 45, so i did

[gbpracing]

With street tyres, you want to keep the pressure high like that because the sidewalls aren't as strong as say a semi slick. Ive seen people run with 40, and have shredded their tyres. I guess it all comes down to what brand/model tyres you use. Also, that american pro driver guy that goes to the circuit club track days told me to run it at 45, so i did

SpoonS has it right, street tires are needed to be higher pressure for the track due to the weaker flexable sidewalls. The tires can get chopped out due to tread blocks moving around under load. Eventually tearing away.
If your going to do track days get a spare set of wheels and semi slicks and enjoy the lap times tumble. Save your good street tires for the street.