Drag this topic up again...
Looking in my 997.1 Turbo owners manual today I see the following info:
Cold (20 degC ambient temp) partially loaded front - 2.3 bar (33 psi)
Cold (20 degC ambient temp) partially loaded rear - 2.7 (39 psi)
Then there is a chart for how pressure changes with temperature, and also when TPM warns you in 2 stages -3 to -6 psi, and then -6psi plus. The chart uses 36 psi as the target cold temp (20 degC) and 42 psi as the target warm temp (60degC) and has it in a nice straight line (1.5 psi difference every 10 degC)
So how does this translate into front and rears if we assume the same linear relationship?! As a guess I plotted the reference data in excel then added parallel lines for 33 and 39 starting points for cold:
Now any suggestions for tyres filled with nitrogen (and of course not knowing how pure the nitrogen is in the tyre or how much water vapor is in there too)? [8D]
Looking in my 997.1 Turbo owners manual today I see the following info:
Cold (20 degC ambient temp) partially loaded front - 2.3 bar (33 psi)
Cold (20 degC ambient temp) partially loaded rear - 2.7 (39 psi)
Then there is a chart for how pressure changes with temperature, and also when TPM warns you in 2 stages -3 to -6 psi, and then -6psi plus. The chart uses 36 psi as the target cold temp (20 degC) and 42 psi as the target warm temp (60degC) and has it in a nice straight line (1.5 psi difference every 10 degC)
So how does this translate into front and rears if we assume the same linear relationship?! As a guess I plotted the reference data in excel then added parallel lines for 33 and 39 starting points for cold:
![tyre-pressures-4.jpg](http://i238.photobucket.com/albums/ff117/Alex911TT/tyre-pressures-4.jpg)
Now any suggestions for tyres filled with nitrogen (and of course not knowing how pure the nitrogen is in the tyre or how much water vapor is in there too)? [8D]