Cold tire pressure
#1
Racer
Thread Starter
Cold tire pressure
I noticed that my tires are at 36 LBS in the morning but after they warm up on my drive to work, they show 41 LBS.
What pressures do you guys see in the morning, compared to after a day of driving. I know I should be at 33 LBS at start up.
Thanks
What pressures do you guys see in the morning, compared to after a day of driving. I know I should be at 33 LBS at start up.
Thanks
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Caflashbob (04-25-19)
#3
Intermediate
on the side of the driver's door it says set the pressures at 33, and that would be when the tires are cold like in the morning
heat from the road and outside air raises the tire pressures, this is correct and anticipated to happen when setting them to 33
33 gives a nice soft ride, note that your manual says to set the psi higher when driving at higher speeds on the highway
note that there can be difference between a hand gauge and the TPMS display depending on what altitude you are at
for example I live at 6000 feet altitude, so my hand gauge reads about 4 psi higher than my TPMS dash display
this is because the TPMS things on the rims are calibrated at sea level and there is a difference between relative and atmospheric air pressure
personally I feel 33 is too soft and makes my tires wear faster in the middle, I set mine at 37 psi hand gauge, everybody seems to differ a little on this
heat from the road and outside air raises the tire pressures, this is correct and anticipated to happen when setting them to 33
33 gives a nice soft ride, note that your manual says to set the psi higher when driving at higher speeds on the highway
note that there can be difference between a hand gauge and the TPMS display depending on what altitude you are at
for example I live at 6000 feet altitude, so my hand gauge reads about 4 psi higher than my TPMS dash display
this is because the TPMS things on the rims are calibrated at sea level and there is a difference between relative and atmospheric air pressure
personally I feel 33 is too soft and makes my tires wear faster in the middle, I set mine at 37 psi hand gauge, everybody seems to differ a little on this
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fwhomeboy (04-24-19)
#4
Racer
Thread Starter
on the side of the driver's door it says set the pressures at 33, and that would be when the tires are cold like in the morning
heat from the road and outside air raises the tire pressures, this is correct and anticipated to happen when setting them to 33
33 gives a nice soft ride, note that your manual says to set the psi higher when driving at higher speeds on the highway
note that there can be difference between a hand gauge and the TPMS display depending on what altitude you are at
for example I live at 6000 feet altitude, so my hand gauge reads about 4 psi higher than my TPMS dash display
this is because the TPMS things on the rims are calibrated at sea level and there is a difference between relative and atmospheric air pressure
personally I feel 33 is too soft and makes my tires wear faster in the middle, I set mine at 37 psi hand gauge, everybody seems to differ a little on this
heat from the road and outside air raises the tire pressures, this is correct and anticipated to happen when setting them to 33
33 gives a nice soft ride, note that your manual says to set the psi higher when driving at higher speeds on the highway
note that there can be difference between a hand gauge and the TPMS display depending on what altitude you are at
for example I live at 6000 feet altitude, so my hand gauge reads about 4 psi higher than my TPMS dash display
this is because the TPMS things on the rims are calibrated at sea level and there is a difference between relative and atmospheric air pressure
personally I feel 33 is too soft and makes my tires wear faster in the middle, I set mine at 37 psi hand gauge, everybody seems to differ a little on this
#5
Lexus Fanatic
I run mine at 31 cold
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#8
#9
Tire sidewall and tread flex at the contact patch is responsible for most of the heating. The Ideal Gas Law equation is PV=nRT, so Pressure is dependent on nRT/V. Since n is the number of moles of gas in the tire and is constant, and R (ideal gas constant) and V (the volume inside the tire) are also constant, essentially Pressure is directly proportional to Temperature.
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fwhomeboy (04-25-19)
#13
I just chalk it up to imprecision of the sensors. At least they are consistent to each other which I care about. As of late I've been paranoid since my old set of tires were wearing unevenly & I want my new set to last as long as possible after realignment. Interestingly, it was just toe that was out.
#15
Mxm4 33 cold
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