Cold vs hot psi

Discussion in 'Exterior' started by HACK BLOCK, Jun 14, 2019 at 11:30 AM.

  1. HACK BLOCK

    HACK BLOCK Full Access Member

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    I don't have access to air so I gotta drive about 10 minutes to the gas station. what's a good "hot" psi for a 285/45/22. max tire psi is 50. the door has cold psi up to 20's
     
  2. Big Mama

    Big Mama Full Access Member

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    I run 35 but I have 305/40/22. If I’m going to do a lot of highway driving or towing I’ll bump it up a little. When my light comes on I usually have 25 or so but once I drive a few miles the light goes off. Get yourself a small compressor for under $50.
     
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  3. swathdiver

    swathdiver Full Access Member

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    Tires typically pick up 3-5 psi from cold to hot; speed, time of day and climate are the main factors. Setting them cold, before the sun is beating on one side, gets you a most accurate setting for all four. Our new home faces east so the tires on the south side get hot first and are the hottest while the right front/north west tire remains the coolest all day.

    For those with a Tech-2, you can get all the tires within a half pound of each other by using the DIC AND Tech-2 to set air pressure. It can be a pain sometimes and may require the patience of a parent but well worth the smooth ride on the highway afterwards. When the left differs from the right more than a few pounds the truck feels like she's trying to drive in two different directions. I believe this is amplified for those running LT tires compared with P-Metric radials.
     
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  4. HACK BLOCK

    HACK BLOCK Full Access Member

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    I used a digital gauge and set it to 35 and the dic read it as 34 so I'm 1 pound off
     
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  5. Dcmaynor

    Dcmaynor Full Access Member

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    Unless you are using nitrogen. Then the two are not supposed to be that different.
     
  6. Doubeleive

    Doubeleive Supporting Member

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    your tire's leak?
     
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  7. Big Mama

    Big Mama Full Access Member

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    Touche’ says the man from central CA
     
  8. swathdiver

    swathdiver Full Access Member

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    It seems to me that one (DIC) reads whole numbers and the other (TECH-2) rounds up.
     
  9. Doubeleive

    Doubeleive Supporting Member

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    I was just wondering because you said when yours go down to 25 the light comes on then goes back out
     
  10. Big Mama

    Big Mama Full Access Member

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    Usually in fall or spring when we get goofy weather changes like 35 degrees cooler than yesterday but it is usually the same one front left
     
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