CloseQuote:
RC said:
ben, the Porsche recommended tire pressure is always the MINIMUM tire pressure. I would take the recommended tire pressure for a fully loaded car and add around 0.1 bar to it. This should do just fine. On the track, go with the lowest recommended tire pressure and make sure you warm up the tires first during the first two rounds.
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W8MM said:
Ben,
How are you measuring the pressure?
Did you use the Tire Pressure Monitor (RDK) built in to the car, or did you use an external guage?
The RDK system has air-temperature compensation built into the readings. Very cool.
Quote:
W8MM said:
Ben,
How are you measuring the pressure?
Did you use the Tire Pressure Monitor (RDK) built in to the car, or did you use an external guage?
The RDK system has air-temperature compensation built into the readings. Very cool.
Quote:
ben, lj said:
I use an external gauge to check/fill (as the manual also advices) though I use the RDK system to monitor how much they inflate as they are driven to see if the addition is too high or ok. FWIW, I set them at 32/32 today and experienced 8 to 10 PSI increases when putting the car through it's paces. For that kind of driving, I think I'm going to move up 2 PSI (from 32) at a time to see if I can achieve more like a 5 to 6 PSI increase.
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Grant said:
Mike - Is the air temp measured the ambient air temp or the temp inside the tire? Would be interesting if it were the latter
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ADias said:Quote:
ben, lj said:
I use an external gauge to check/fill (as the manual also advices) though I use the RDK system to monitor how much they inflate as they are driven to see if the addition is too high or ok. FWIW, I set them at 32/32 today and experienced 8 to 10 PSI increases when putting the car through it's paces. For that kind of driving, I think I'm going to move up 2 PSI (from 32) at a time to see if I can achieve more like a 5 to 6 PSI increase.
Raising the "cold" PSI should not affect the "hot" delta. W/ dry air or N2 it should follow the PV=nRT law. The deltas you are getting sound reasonable.
Quote:
ben, lj said:Quote:
ADias said:Quote:
ben, lj said:
I use an external gauge to check/fill (as the manual also advices) though I use the RDK system to monitor how much they inflate as they are driven to see if the addition is too high or ok. FWIW, I set them at 32/32 today and experienced 8 to 10 PSI increases when putting the car through it's paces. For that kind of driving, I think I'm going to move up 2 PSI (from 32) at a time to see if I can achieve more like a 5 to 6 PSI increase.
Raising the "cold" PSI should not affect the "hot" delta. W/ dry air or N2 it should follow the PV=nRT law. The deltas you are getting sound reasonable.
really? i always thought they got much hotter when underinflated? btw, i would think the CGT with slicks would be absolutely INSANELY fast on the track. the tires are most def the weakest link.
Quote:
ADias said:
If they are grossly underinflated, yes they will heat faster, but that is a different mechanism.
28 janv. 2005 13:10:31
) and also achieve the higher operation temperature that they need to grip under colder weather.
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. But anyway, does the book recommends a max/min pressure?? If not I suggest you keep it @ 32 and drive it for a while.
