which track ? each track use different tyre heat multiplier.
which compound ? each compound (soft/med/hard/interm/wet/monsoon) has a different temperature data.
which tyre set ? hq2022/2021, reborn, stock...
you can change tyre set via GTR2_SETUP.CMD : stock, reborn, hq, etc ...
Tyres need 4 laps to get optimum temp, do not take in account the higher temp peak at the end of the fastest straight because tyres will cool down during slow curves : if temp cool down between 70-110°C for slicks or 50-100°C for treaded/rain then it is optimal tyre temp.
Check Inner-Center-External tyre temp : good pressure when I>C>E
If C<E then increase tyre pressure
If C>I then decrease tyre pressure
I have made all temperatures tests for hq tyres on barcelona track (55 different tyres x 6 compounds x 4 laps = 1320 test laps each time I modified data in tyr file so I made more than 5000 laps at barcelona to make hq tyres ; with non optimized tyres you will have front left tyre overheating at barcelona) to avoid overheating but you certainly need to optimize car setup (tyre pressure and camber at least) for other tracks.
Moreover, if tyre temperatures are excessive on some extra modded tracks then you need to adjust these 2 lines in track .GDB file :
FrontTireHeatMult=
RearTireHeatMult=
default is either 1.0 or 0.9 but you can set 0.7 if tyres are overheating or 1.3 if they are too cold.
a screenshot is always welcome