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how much tire pressure

Discussion in 'Wheels & Tires' started by ilovemytaco, Nov 1, 2008.

  1. Nov 1, 2008 at 9:40 AM
    #1
    ilovemytaco

    ilovemytaco [OP] Well-Known Member

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    i have a 08 tacoma 4dr 2wd with the stock rims and tires and i was wondering how much should my tire pressure be...i checked them and they all have about 28psi but when i look at the tire it says 50 psi max. so i was wondering how much is a good pressure to give a smoth ride and good gas mileage or is 28 enough?
    thanx
     
  2. Nov 1, 2008 at 10:11 AM
    #2
    humanoid

    humanoid bite me

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    I had a '99 Xtra Cab PreRunner SR5 V6
    I would say 32 or 34 PSI. 50 PSI is the absolute max tire pressure that the tire can sustain safely, so I wouldn't go that high. I'd say 32 or 34 would be a good balance for comfort and MPG. What does the little sticker say on the driver's side door jamb?
     
  3. Nov 1, 2008 at 10:56 AM
    #3
    TacoNut

    TacoNut IgnoringChrisWatchingEdLi veVicariouslyThroughMJP2

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    The sticker says
    29 PSI front
    32 PSI back (I think)

    It's really all about personal preference.
     
  4. Nov 1, 2008 at 11:45 AM
    #4
    mws4ua

    mws4ua I'll try being nicer if you try being smarter.

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    You are correct.

    Open your driver's door and look at the sticker on the frame of the truck. 29/32 front/back is what it recommends. I run mine at 30-32 all the way around.
     
  5. Nov 1, 2008 at 1:45 PM
    #5
    Brunes

    Brunes abides. Staff Member

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    In general...Lower pressure is softer ride with lower gas mileage. High you get...harder ride with better mpg response.
    Using the stock recommendations is a good place to start.
     
  6. Nov 1, 2008 at 3:59 PM
    #6
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    Not really. Under-inflated tires can impact mileage because you're increasing the contact patch (more friction) but going over the recommended pressure doesn't do much to increase mileage because beyond the recommended pressure; you're not really reducing the contact patch size, just making the tire harder.

    Even at 10psi lower than recommended, you might only see a 0.5 mpg drop.
     
  7. Nov 1, 2008 at 4:05 PM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    This is true. The best way I have found to determine the propper psi for your tires, as everyones are different, is to make a chalk line across your tread, from the out side of the tire, inward. Then drive it 100 feet or so, and see how much of the line is left. Idealy, you want to have the chalk completely removed except the last 1/8". :)
     
  8. Nov 1, 2008 at 4:08 PM
    #8
    Brunes

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    For the stock tires you get a recommended pressure-I haven't seen many swapped tires that come with a recco'd psi. They have a max..but that's the only number I remember seeing on the spec sheets.

    I'm all for the "You gotta try it out for yourself and find out what you like for a ride" method. After you like how the tires feel for your normal application-Make sure the pressure is still within specs for the tire.

    For this one- my last comment is most important- Use the stock recommendations for a starting point and then adjust from there.
     
  9. Nov 1, 2008 at 4:10 PM
    #9
    Brunes

    Brunes abides. Staff Member

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    Good method for finding the right pressure. You're so gall durn smart.
     
  10. Nov 1, 2008 at 4:13 PM
    #10
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    Original post:
    Good point though.
     
  11. Nov 1, 2008 at 4:15 PM
    #11
    Brunes

    Brunes abides. Staff Member

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    Yeah...I know...I read it.

    If you read my post you'd see that the last line says

    That's a starting place. The in general stuff can help the OP tailor his truck to his liking. so can chris's method. so can alot of other things....That's why the forum is here...to discuss.
     
  12. Nov 1, 2008 at 4:18 PM
    #12
    cmytacoma

    cmytacoma Well-Known Member

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    I would have to agree with Brunes Here! He didn't say fill to 50 and you'll get 30 mpgs, he said running them softer the less mileage and harder=more which is a prety basic rule of thumb. I'm NOT saying that what you stated was incorrect but i think you're getting too technical on a pretty basic question.
     
  13. Nov 1, 2008 at 4:24 PM
    #13
    Ken Dawg

    Ken Dawg Well-Known Member

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    its a truck...not a mercedes

    i run them at max...do that with harley etc. also

    now a 3/4 ton 4x4 i will back off 5-8 lbs from max.

    this all said its really personal preference.
    ;)
     
  14. Nov 1, 2008 at 4:31 PM
    #14
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    It's not correct though, so it's not a basic rule of thumb. Underinflating will impact mileage, inflating beyond the recommended pressure won't increase mileage. It may affect ride quality, but you won't boost mpg. And for the record, I said he did have a good point.
     
  15. Nov 1, 2008 at 4:32 PM
    #15
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    Motorcyles are different because they have a rounded tire. Inflating a motorcycle tire beyond the recommended pressure reduces the contact patch, and traction.
     
  16. Nov 1, 2008 at 4:34 PM
    #16
    Ken Dawg

    Ken Dawg Well-Known Member

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    tint, k+n drop in, 2nd filter MIA... Pioneer deh-p400ub head unit...Alpine spr-69c fronts and Alpine 17c rears. Either Alpine or Pioneer amp coming and major sound deadening.

    who is past the recommended tire pressure??:rolleyes:
     
  17. Nov 1, 2008 at 4:39 PM
    #17
    luk8272

    luk8272 Poodoo

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    I came check this post to see if chris had filled yall in yet i see that he has thus I am out.
     
  18. Nov 1, 2008 at 4:40 PM
    #18
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    Didn't say you were. I said overinflating a mc tire does reduce the contact patch, as opposed to car/truck tires.
     
  19. Nov 3, 2008 at 12:17 PM
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    Demoncleaner

    Demoncleaner Well-Known Member

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    Just a note for those running much more pressure than the manual/door jam says. Besides the lesser contact patch, a few years ago I found running too high of pressure caused the middle of the tire to wear much quicker than the outsides. Keeping around the recommended psi, tire wears even, good traction, mpg is where it should be. Heavy loads I'll add a few more.
     
  20. Nov 3, 2008 at 12:23 PM
    #20
    futile

    futile Active Member

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    Excellent idea. I've never heard of it before...
     
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