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Tire Temp Vs Pressure!

Discussion in 'Wheels & Tires' started by BlackRiverGuy, Jan 12, 2019.

  1. Jan 12, 2019 at 10:22 AM
    #1
    BlackRiverGuy

    BlackRiverGuy [OP] New Member

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    In Process ARE color matched Z type cap. Pro Comp 3/1 leveling kit. Nitto Grappler 295 70 R18's
    Any tire experts in this forum?
    Question: Related to airing up after aired down. So after a weekend expedition, driving back on a primitive road to a decent highway, one would stop to air the tires back up, this means after driving a stretch of time the tires are now heated up. When looking at the tire placard on the driver side door jamb the tire pressures are listed for cold tires. Is there some kind of chart or data that lists what the equivalent pressure would be based on temperature? Or am I just grasping at straws?
     
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  2. Jan 12, 2019 at 11:10 AM
    #2
    15whtrd

    15whtrd I tried being reasonable, but I didn't like it.

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  3. Jan 12, 2019 at 12:48 PM
    #3
    HappyGilmore

    HappyGilmore New jack

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    I agree. The difference in hot/cold PSI is probably not enough to prematurely wear the tires on your 1 trip back home. Just check them after the next time you let it sit for awhile.
     
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  4. Jan 12, 2019 at 1:08 PM
    #4
    Jengel451

    Jengel451 Misanthropist

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    Not hot enough to make much difference. Road racing tires can see as much as 10psi difference, but they are hot enough to boil water thats poured on them.
     
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  5. Jan 12, 2019 at 1:26 PM
    #5
    BlackRiverGuy

    BlackRiverGuy [OP] New Member

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    Thanks for the feedback! I did some further research as well, and yes there are many variables associated with this, almost enough to give one a headache, so as recommended in the above posts I will just inflate close to the listed psi, once returned home let the truck sit awhile and check again. Thats the game plan. Thanks again!
     
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  6. Jan 14, 2019 at 5:58 AM
    #6
    Stig

    Stig New Member

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    You're making this way too complicated.

    Set the on pavement cold pressure correctly. Drive on the pavement for 20 minutes. Get out and measure the pressure. That's the pressure you can air up to if the tires are already up to temp. It's probably only 3 or 4 psi.
     
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  7. Jan 14, 2019 at 7:07 AM
    #7
    don3032

    don3032 New Member

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    Any one look into running nitrogen in tires, had the tires on my last truck serviced with nitrogen and never had any issues with pressure changes
     
  8. Jan 14, 2019 at 7:13 AM
    #8
    Jengel451

    Jengel451 Misanthropist

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    Nitrogen is a sales gimick. I used it when racing since the pressure differential is less due to no moisture etc. I honestly see no need for day to day use. The fact they charge what they do is proof they fleecing you. I read an article a while back that had a good analogy. "it's like rubbing cheetah blood on your engine to get more power"
     
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  9. Jan 14, 2019 at 7:15 AM
    #9
    Stormtrooper81

    Stormtrooper81 New Member

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    Normally a car or truck heats up at most 5psi. Many variables in the calculation. Niitrogen is not needed in passenger cars or trucks. IMHO
     
  10. Jan 14, 2019 at 7:17 AM
    #10
    Jengel451

    Jengel451 Misanthropist

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    and to add, when we bought my wife's rig, I told them to get the nitrogen out and put regular air in, and to take that off the sales price. ;) And I wanted black valve stem caps back on. I hate sales people.
     
  11. Jan 14, 2019 at 7:22 AM
    #11
    ColoradoTJ

    ColoradoTJ Professional Cat Herding Expert Staff Member

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    Good topic.

    I just air back up to 3/4 of the max tire pressure unless towing, check later. Like others have said, maybe 5 psi.
     
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  12. Jan 14, 2019 at 7:24 AM
    #12
    ColoradoTJ

    ColoradoTJ Professional Cat Herding Expert Staff Member

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    That’s some funny stuff right there.

    Did you tell them only 78% N2 or the deal was off? Lol. That would have blown their minds.
     
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  13. Jan 14, 2019 at 7:33 AM
    #13
    don3032

    don3032 New Member

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    Just going off what I have experienced, we serviced all aircraft tires with nitrogen, and in my truck the psi will change about 5 after few minutes of driving, just enough to keep the annoying light sensor off. And it was free at the shop I went too, wouldnt have paid for it.
     
  14. Jan 14, 2019 at 9:16 AM
    #14
    HappyGilmore

    HappyGilmore New jack

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    FYI if anyone wants to experiment, Costco fills all their tires with nitrogen and i think the self serve tire inflation station is nitrogen as well.
     
  15. Jan 14, 2019 at 9:19 AM
    #15
    Jengel451

    Jengel451 Misanthropist

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    You'll need to purge all of the summer "normal" air out before you put any nitrogen in. that means EVERYTHING. Any moisture from normal air will negate any benefits.
     
  16. Jan 14, 2019 at 9:21 AM
    #16
    Stormtrooper81

    Stormtrooper81 New Member

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    mouth-air.jpg
     
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