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PSI thoughts

Discussion in 'Wheels & Tires' started by sean266, Oct 11, 2011.

  1. Oct 11, 2011 at 7:04 AM
    #1
    sean266

    sean266 [OP] #ThinBlueLine Moderator

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    I'm running 285/75/16 Duratracs on a 3" lift. Currently my psi is set @38 all around.
    Thoughts?
     
  2. Oct 11, 2011 at 7:17 AM
    #2
    stunt man hans

    stunt man hans DISPLACED VIKING LIVING IN GEORGIA

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    what load range? and is your truck 4x4 just asking due to the little bit of extra weight.

    if they are e load range like i think they are your going to want to lower that down to around 32 psi.

    for example my 4x4 regular cab has 295 trail grapplers and i run them at 32 psi they are an e load tire so they are quite stiff as it is.
     
  3. Oct 11, 2011 at 7:20 AM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Seems awfully high. Do the Chalk test to see the best PSI to run.
     
  4. Oct 11, 2011 at 7:21 AM
    #4
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    Chaulk test :cool:
     
  5. Oct 11, 2011 at 7:21 AM
    #5
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    Dammit! Beat me to it... :eek:
     
  6. Oct 11, 2011 at 7:31 AM
    #6
    sean266

    sean266 [OP] #ThinBlueLine Moderator

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    I'll double check the load range.
    DCSB
    TRD Off-Road 4x4 as shown on my page
     
  7. Oct 11, 2011 at 7:32 AM
    #7
    97yota4wd

    97yota4wd Well-Known Member

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    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    i would do like 34psi, but chalk test if you want it to be perfect
     
  8. Oct 11, 2011 at 7:32 AM
    #8
    sean266

    sean266 [OP] #ThinBlueLine Moderator

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    What is this chalk test u speak of
     
  9. Oct 11, 2011 at 7:33 AM
    #9
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    Draw a line of chaulk across the tread and drive for a very short distance. Ideally, the chaulk should wear off evenly across the tread. If the pressure is too high, the center of the line will wear off and the sides won't, if it's too low, the sides will wear off and the center won't.
     
  10. Oct 11, 2011 at 7:37 AM
    #10
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    How to figure the correct tire pressure for larger tires.
    [​IMG]This article was spawned from a continuing conversation from our Jeeping friend Bob in his quest to get his JK handling correctly. If your Jeep is in stock form with stock size and type tires you may not need bother with this article. The recommended pressures listed in the door jamb will suit you fine. But, if you are like most of us your Jeep is lifted and equipped with larger and probably wider tires.
    Typically larger tires handle your vehicles weight differently than stock and the original door recommendations don’t necessarily apply. Why should you care? A tire not properly inflated will wear incorrectly and quicker than a properly inflated one would. Replacing tires that are worn out too quickly will hurt you in the pocket book, in actually more ways than one.
    An under-inflated tire will cause increased rolling resistance which will rob you of fuel economy and possibly damage the tire due to excessive heat. Other symptoms of under-inflation can be a steering pull.
    On the other hand an over-inflated tire can give you an improvement in fuel economy but that savings will disappear when you need to replace your tires sooner. Over-inflation will also cause a harsher ride potential poor handling since the tires may skid over the road instead of grip.
    [​IMG]
    The right illustration is a cross section giving a better view to what proper or improper inflation does.
    Under-inflated: Wears the edges of the tread more than the center.
    Over-inflated: Wears the center of the tread more than the edges.
    Proper: The entire tread is worn at the same rate (aka, correct pressure).
    What to do?
    Checking proper tire inflation is rather simple and requires some chalk or a utility crayon.
    Make a mark all the way across each tire.
    Drive the Jeep for a short distance, a straight line is best.
    Note the wear pattern in the chalk. If there is chalk left at the edge the tire is over inflated. Chalk left in the center means it’s under-inflated. A clean pattern indicates the pressure is just right. Make a note of the pressure for future reference. This procedure would need to be performed again of different size or style tires are added.
    [​IMG]
    Chalk Line
    [​IMG]
    Over Inflated
    [​IMG]
    Proper Inflation
     
  11. Oct 11, 2011 at 7:56 AM
    #11
    sean266

    sean266 [OP] #ThinBlueLine Moderator

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    Load range E
     
  12. Oct 11, 2011 at 7:58 AM
    #12
    sean266

    sean266 [OP] #ThinBlueLine Moderator

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    So just drive a short distance with chalk on the tread where it should all fade away away?
     
  13. Oct 15, 2011 at 8:46 AM
    #13
    sean266

    sean266 [OP] #ThinBlueLine Moderator

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    How much chalk to apply? I tried this the other day on all 4 and the chalk rubbed off across all 4 rather quickly.
     
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