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Tire Pressure

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Old 02-26-2006, 04:25 PM
  #16  
drbf
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Front 36, Rear 44
Old 02-26-2006, 10:24 PM
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uzj100
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Originally Posted by wross996tt
How could you ever need to subtract air (provided you filed them with the right amount to begin with)?
This doesn't apply to 996s, only 997s, and also in CO your temperature is a constant 68 degrees, so you'll never have to lower the pressure after inflating your tires to proper pressure. Ocassionally, where I live the "cold" temp is above 68 and what was a correct pressure at 68, may now be too high, hence I may lower the pressure to spec

Old 02-28-2006, 07:48 PM
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lawjdc
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Originally Posted by MJones
36f 44r tire wear is even across...
I measure them with a depth gauge.

Also remember that the inflation pressures are to be done at the
nominal temperature of 68° cold.
Easy for you to say in LA! Not so easy in colder climates - we may have to wait for spring.

BTW - I run 36 front, 44 back, done at whatever nominal temperature the garage happens to be.
Old 02-28-2006, 08:11 PM
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The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower).

Do the math from 68°, you'll be on target!
Old 02-28-2006, 08:27 PM
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AirPhoto
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doesn't the tire pressure monitoring system have a setting which displays whether the tires are over or under inflated, taking temperature into consideration? (this is a somewhat rhetorical question that I should know the answer to, since I paid for the option, but am having too much fun just getting in car an driving...opposed to reading the manual).
Old 02-28-2006, 08:49 PM
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boolala
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I doubt it. On my Benz the on board TPMS is virtually identical to using a tire pressure gauge.
Old 02-28-2006, 08:58 PM
  #22  
MJones
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Originally Posted by AirPhoto
doesn't the tire pressure monitoring system have a setting which displays whether the tires are over or under inflated, taking temperature into consideration? (this is a somewhat rhetorical question that I should know the answer to, since I paid for the option, but am having too much fun just getting in car an driving...opposed to reading the manual).

Friendly Advice....

The tire pressure monitoring offers the following functions:
– Display of the actual tire pressure while the vehicle is in motion
– Display of the deviation from the required pressure (refilling pressure)
– Display of currently set tire size and type
– Tire pressure warnings in two stages

Old 02-28-2006, 10:27 PM
  #23  
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Too busy to RTFM because I'm FN Driving (only had the car a week) Thanks for the FN advice, knew I saw that somewhere. Great thing about these forums is you can always find a few MF'ers (manual flippers) to answer all your questions
Old 02-28-2006, 11:34 PM
  #24  
lawjdc
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Originally Posted by MJones
The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower).

Do the math from 68°, you'll be on target!
Thanks - that's an easy conversion factor to use.



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