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What psi should i run?

Discussion in 'Wheels & Tires' started by TacoTRD420, Sep 10, 2009.

  1. Oct 4, 2015 at 5:28 PM
    #141
    jumpy180

    jumpy180 Member

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    Blue grass Taco:
    I'm curious if you've tried any lower pressure in the rear tires with an un-loaded truck?
    My chalk test with pretty much the same set up came up with 36 front, and 30 rear, unloaded.
    My mileage has been 19-20 mpg. I've not been able to take the temps of my tires, but I think I would like to also start using a good laser temp gage.
    I can see going up to 38 on the fronts, but 38 in the rears, unloaded seems like it would ride rough and jittery.
    Harpolith:
    Yes, at 30 in the rear I'm still seeing chalk at the edges, but didn't really want to go any lower.
    Thanks for the good information.
     
    Last edited: Oct 4, 2015
  2. Oct 4, 2015 at 6:04 PM
    #142
    NMTrailRider

    NMTrailRider Well-Known Member

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    Good to have you confirm pressures, too. I was feeling so soft at 30/32. Still haven't bumped from 36 to 38 front, but not sure it's necessary. Yeah I wouldn't wanna go lower than 30 either. In fact, the 36 I'm running rear really doesn't feel all that bad. I'm gonna stick with it, as I seem to have more tread on the centers anyway. Probably a result of running so low for so long. I just stuck with door panel recommendation without really thinking about it.
     
  3. Nov 13, 2015 at 9:12 PM
    #143
    Sriracha Tacoma

    Sriracha Tacoma t40fpv

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    Hey everyone, the exclamation horseshoe popped up on my meter gauge and so I am going to check the psi. My question is, I have All Terrain Tires on my truck, so would I still follow the psi that Toyota Manufacture states for my tire when I open the driver side door? Or do I check the psi on my tires? I also have been told that the psi number on the side of tires are the maximum pressure and that is the incorrect number to put. Help, first timer, thanks!
     
  4. Nov 13, 2015 at 9:32 PM
    #144
    NightProwler

    NightProwler Well-Known Member

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    If your tires are the same size as stock or close to/no extra loads, then using the door rating should be fine. And yes the psi on tire is max psi so you don't wanna use that.
     
  5. Nov 14, 2015 at 12:38 AM
    #145
    NMTrailRider

    NMTrailRider Well-Known Member

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    If you really want to do it correctly, you'd do the chalk test (search and you'll find instructions- on TW or google). Basically, over inflate them very slightly, draw a chalk line on the tire, and then drive in a straight line for 50' and then get out and see what the line looks like. Over inflated you'll see the line worn off in the center of the tire. Under inflated and the line will wear off the edges. Your goal is to have the line wear off evenly all the way across. If you start with slightly over inflated, you just let out a little air at a time until the chalk line wears all the way across the tire evenly.

    The stocks are soft tires. If you're running anything else, you'll probably want to be a little higher than listed on the door panel. 35 front, 33 rear would be ballpark. If you're gonna do the chalk test, try 38 front, 36 rear, and air down until you get it right.

    Short answer, I'm guessing the door will be a little lower than you want in your AT's for daily driving.
     
  6. Nov 14, 2015 at 5:19 AM
    #146
    BCephus

    BCephus Alright then

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    OME 886/dakar heavy, ARB bumper, 9.5XP warn, PDM tranquil kit, custom bullet hole tailgate anti theft kit, Camburg ball joint UCAs, Centerforce II clutch, FJ cruiser TRD wheels (black) with 285/75/16 Ds (white letters out, (Duh))
    I don't see your tire size, but you can run what the door says if you have no additional weight (for starters). I have 33 BFG A/Ts (Ds) and use 38fr/ 30 rear on 7.5 in wheels. They are wearing perfectly. I do add air to the rear when towing. I have an ARB bumper and winch, explaining the extra pressure in the front. We tend to run too much air in the rear which wears the middle, especially with narrow-for-tire-width wheels. Get something accurate to measure wear with long term and measure/adjust at oil changes. I like strips of gorilla tape across the tread better than chalk, as you can get a longer composite.
     
  7. Nov 19, 2015 at 10:22 AM
    #147
    TacoTRD420

    TacoTRD420 [OP] ( . Y . ) = :)

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    Toyota FJ TT...Pretty much stock.
    Dang 6 years later and this thread is still a sticky!!! A lot has change tho!

    9425DC31-1129-4360-BD7D-141041DD374B_zps_18e6be4c8a19ce315652cddaf92409d077670c51.jpg

    00C773D7-B72B-43CC-A22B-07238B55E2A1_zps_9d312a83051e318cf389a281a5261e91b1f884d9.jpg
     
  8. Dec 9, 2015 at 9:00 PM
    #148
    Taco_Kid

    Taco_Kid Well-Known Member

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    i've had ~33's 285/75/16's on 8" wide rims for past 7yrs w/ ~42k miles. always had them at about 34front and 32rear even if doing short run w/ ~1k lb in the bed. no issues with wear. my 2006 is a 4cyl. section width plays a big role. but i a willing to bet that for up to 285/75/16 in tire size a 34f/32r will get you to full tread life w/o wear issues.
     
  9. Dec 20, 2015 at 10:08 PM
    #149
    splitbolt

    splitbolt Voodoo Witch Doctor

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    My stock Goodyear Kevlars P265/70/16 have a 112 Load Index and the placard recommended tire pressure is 30 psi.
    load%20index_zpslvmmzri5_60ae94cbf0dafb0f92e4c7b52c21e13e854f9fcb.jpg
    This gives me a load requirement of 2,117 lbs; 1,924 lbs after FMVSS 1.1 correction factor.
    I replaced with BFG LT265/75/16 Load E and run 36 psi.
    Had I chosen;
    -LT265/70/16/37 psi
    -LT285/70/16/33 psi
    -LT285/75/16/30 psi
    [​IMG]


    Untitled_zpsgzlkdecj_d3185f92b33ac7e9d26f2abb0ecf28c562da77c4.jpg
     
    Last edited: Dec 20, 2015
  10. Dec 22, 2015 at 7:49 PM
    #150
    Taco_Kid

    Taco_Kid Well-Known Member

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    36psi? why? i think the chart means you need that psi for the sidewalls to carry that load, no? if its just truck load then 34psi should be about max ??
     
  11. Dec 22, 2015 at 10:23 PM
    #151
    splitbolt

    splitbolt Voodoo Witch Doctor

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    I require 1,924 lbs.

    35 psi would only give me 1,910lbs.
    The difference between 40 psi and 35 psi is (2,100-1,910=)190 lbs. So, 1psi=38lbs.

    1,910(35psi)+38(1psi)=1,948(36psi)

    1,910(35psi)-38(1psi)=1,872(34psi)

    1924_zpssobphbhn_07d3497fc910b69361c208faf9262a4dc70581b4.jpg
     
  12. Jan 4, 2016 at 7:03 AM
    #152
    TacoSeattle

    TacoSeattle Well-Known Member

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    I have a 2016 Dual Cab Short Box Off Road with 265/75 16 KO2's running 33 psi cold and a stock suspension. My ride quality is good on smooth freeway and roads, but on cracked freeway pavement or slabbed concrete road types, or rough rutted roads it is a really harsh ride with lots of jolts.

    What is your ride quality at these higher pressures?
     
  13. Jan 4, 2016 at 8:10 AM
    #153
    splitbolt

    splitbolt Voodoo Witch Doctor

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    Me?
    I have the same truck and tire as you; I run 36 PSI.

    Yes, 36 psi, is a higher pressure than the vehicle tire placard(30 PSI), but these aren't stock spec tires.
    Anytime you change tire size and/or load spec, the PSI on the vehicle tire placard no longer applies.
    We changed both.
    The load rating of the stock ISO-metric 265/70/16/112 @ 30 PSI is equal to a LT265/75/16 @ 36 PSI.
    Here's a pdf link explaining further;
    https://toyotires2-1524598101.netdna-ssl.com/assets/lib:toyo content/Application_of_Load_Inflation_Tables_20151020.pdf

    For a Load E, I think it rides pretty damn good.

    You're jarring has more to do with the suspension having to deal with an additional 18 lbs(+50%) at each wheel vs stock.
    Load C would be nice...
    I'm planning on a set of extended 2.5 coilovers, so that ought to help some...
     
  14. Jan 5, 2016 at 10:54 AM
    #154
    Sharpish

    Sharpish Well-Known Member

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    I have a 2012 TRD OR ACLB with new 265/70R/16 BFG AT KO2 and the ride is pretty harsh. It definately raps over small bumps and ripples. The problem is that from just visually looking at the fronts, they look like they are cupping a little and could use a few more PSI. I will check when I get home and bring it up to 36/32 front/rear if they are low. E rated tires are a little stiff for a Tacoma. I/m thinking putting more air in will make it even harsher, so I might have to choose between ride comfort and tire longevity which would suck.
     
  15. Jan 5, 2016 at 1:33 PM
    #155
    TacoSeattle

    TacoSeattle Well-Known Member

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    Sharpish - I bought my 265/75 16 Load Range E KO2's at Discount Tires and after approximately 400 mile test I found them for the long run, i.e. 50,000 miles, to be way too uncomfortable on the freeways of the NW and also over manhole covers on side streets. Discount Tires is taking them back and I just ordered Cooper AT3's in the stock size. My out of pocket expense is only for the mount and balance of $74 and they transferred the replacement certificates also. They are awesome to do business with.

    The AT3's have good write ups here on TW and with Expediition Portal. I mount this weekend so I will post up what I learn.
     
    Last edited: Jan 6, 2016
  16. Jan 6, 2016 at 5:23 PM
    #156
    Sharpish

    Sharpish Well-Known Member

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    Hey TacoSeattle, thanks for the info. I checked my pressures today and they were all over the map. From 30-37 psi. Damn tire shop. I set the fronts up at 38 and the rears 36 warm (not hot) and I am pleasantly surprised ... The truck tracks dead true now, it turns much nicer, it feels much lighter and nimbler overall. The harshness of the ride is actually lessened now. I know, it makes no sense, but it seems to ride over bumps smoother, maybe because the suspension is now doing more of the work, I don't know.

    I like the tires, I do a lot of hunting and I like the durability of the 10 ply rubber, plus they do look amazing. So I will give them some more time.
     
  17. Mar 5, 2016 at 7:37 PM
    #157
    Sharpish

    Sharpish Well-Known Member

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    I bought 265/70r/17 duratracs and 17" trail team wheels. Set to 35 front 32 rear the truck now rides like a dream. It soaks up small bumps and the ride is just so much better.
     
    Last edited: Mar 5, 2016
  18. Mar 5, 2016 at 8:26 PM
    #158
    force9000

    force9000 Member

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    I'm assuming you made a typo but I really hope you're not running a 16'' tire on a 17'' wheel.
     
  19. Mar 5, 2016 at 8:28 PM
    #159
    Sharpish

    Sharpish Well-Known Member

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    Is that even possible? Probably not. Yes, it was a typo, fixed now, thanks
     
  20. Apr 5, 2016 at 7:38 PM
    #160
    Dhannah

    Dhannah 2017 Tacoma OR DCSB

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    So I'm running 265 70 17 hankook Dyna pros what should I run I'm thinking 36 or 38 just have 3 inch lift and got these tires for a steal so until I go up what do you think I should be running?
     

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