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i'm at 34/36 hot on nittos - 245/40R18 and 275/35R18. ran a bit less pressure on yoko ado8s.
ditto check temps as soon as i get into the pits. too much air and you'll ride on the centre of your tire - reduce contact patch - cook your tire in the middle and get greasy quick. too little pressure and you will start rolling onto your sidewalls and, again, greasy.
lots of variables - temp of day, length of session, type of track surface, tire compound, tire sidewall design, etc. also with car setup - weight, front/rear balance, sway bar settings, etc. - tire pressure is yet another way to 'tune' your car.
pyrometer is a good way to ensure you are not cooking the centre of the tire and chalking your sidewall to confirm how much you are rolling over is another. also just keep an eye on how your tires are wearing - sidewall wear markers, centre vs edge wear bars.
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