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Found this on scoobynet..........
How do you set your tyre pressures when driving on track?
When setting your tyre pressures for your road car during your weekly car checks (you do this don’t you!) you should always set these when cold to give a static state of reference. As you drive your tyre pressures will always increase due to the heat generated as explained above.
When it comes to setting tyre pressures for the track this method has to be thrown out of the window. Due to the fact that all four tyres run at different temperatures on a racetrack you have to set each corner independently. Also it is advisable to run the tyres at a higher pressure than you would on the road, this is mainly to help the tyre to maintain its shape under hard cornering and support the sidewall. I usually suggest you run 4-6 PSI higher than you would on the road.
Set your tyre pressures evenly before you go on track for the first time 4PSI higher than your normal cold pressures. Go out on track and do one slow lap, one fast lap then one slow lap and come back into the pits. Check your tyre pressures again, you will find that they are all now different to each other with the front left being the highest. Reset your tyre pressures and this time go out and do one slow lap, 5 fast laps then one slow lap and come back into the pits. All four tyres will again have risen with the front left the highest again. Reset all the tyres to be 6PSI higher than you would use on the road and repeat the last exercise. You should now start to see all four tyres stabilising the pressures; you may have to drop the front left a little to even out the pressures. You should now be in a position to drive the car at will without much change in pressures being seen for the rest of the day. It is always a good idea to check your pressures after each run (not just before) to ensure you are not seeing a sudden drop off of pressure in one tyre as this is a good sign you are heading for a tyre failure on track.
Finally remember that if you are intending to drive home on these same tyres check the tread is still legal and check your tyre pressures after 10 miles of normal driving, they will be all over the place and will need resetting. Reset them again in the following morning as per your normal weekly checks.
A word of warning on using road tyres on track. Make sure you know the speed rating of the tyres fitted to your car and never exceed this speed whilst driving on track. As an example I never drive above 85MPH on the public road and yet I often drive faster than 150MPH on a racetrack. If you are going to drive this quickly make sure the tyres are rated for this speed, you do not want a tread failure at 150MPH, it would not be fun.
after convincing him it was relatively standard (this was pre the twin scroll turbo etc) he started asking about tyre pressures and how Tom was getting temperature in the tyres. He was even more confused when he got the reply 'I just checked all the pressures were the same at the start and I get heat in them by driving fast'.
