Good topic , huge one tho ! you guys who do the occasional trackday in your roadcar will be taking a relatively soft car onto a race track , tyres , slicks tyres anyway for the purpose of this dicsussion have an optimum window of temperature to work in , the softer the car the quicker the tyre will warm up and the quicker you'll kill it by rolling onto the outer face .
If youre looking for the optimum then you wont find it for very long unless your car is set up to maximise the tyres potential like a racing car does .
As a rule tho , the ex BTCC tyres i supply to many board members , operate best at 22-24 cold and should optimise around 30-32 psi after work .
also should be noted , if you drive like a fkin loon , you'll lunch the tyres before you break into a smile , go easy and enjoy them .