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Speedometer Calibration Question

Discussion in '2nd Gen. Tacomas (2005-2015)' started by AFTaco, Jul 25, 2009.

  1. Jul 25, 2009 at 2:28 PM
    #1
    AFTaco

    AFTaco [OP] Well-Known Member

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    This might be another newbie question, I looked and didnt find anything on the search. Can the speedometer/odometer be recalibrated with bigger tires?
     
  2. Jul 25, 2009 at 2:48 PM
    #2
    Rocketball

    Rocketball If The World Didn't Suck, We'd All Fall Off

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    Yes, at least it worked for me.

    My speedo was about 3 mph over my actual speed. Going from a 265/65R17 tire to a 265/70R17 put my speedo right on my actual speed.
     
  3. Jul 25, 2009 at 3:14 PM
    #3
    yosh2000

    yosh2000 Well-Known Member

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    no. only way to fix speedo and such is to regear. 4.10s w/ 33 should put you back to oem.(if you have 245s originally)

    Rocketball - ?. you actually didnt recalibrate your speedo, just the original error in your speedo was corrected.
     
  4. Jul 25, 2009 at 3:28 PM
    #4
    AFTaco

    AFTaco [OP] Well-Known Member

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    What do you mean by regear. Could you translate 4.10s, what does that mean? Sorry, i'm kinda new to the forum thing. Thanks
     
  5. Jul 25, 2009 at 3:40 PM
    #5
    yosh2000

    yosh2000 Well-Known Member

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    no worries. regear means to change the gears in your rear axle to a different ratio. you currently have a 3.73 ratio, meaning it takes 3.73 turns of the driveshaft to equal one full rotation of your rear axle. if you regear to a 3.91 ratio with 33" tires, you will get back to nearly the same speed reading as you did with your original setup.

    now, regearing is expensive. your best bet would be to find a complete third member from a previous gen tacoma (95-04) and drop that in. if you dont want that, you will have to purchase a 3.91 gear set and have them installed. installation can run anywhere from $300 to $1000 for a single axle and im sure gears are over $200 (havent priced them, but this is my guess).

    make sense?
     
  6. Jul 25, 2009 at 3:42 PM
    #6
    Burgman

    Burgman I KEEEEEL YOU

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    which is not necessary for 33's on a v6 and it will most likely put ur speedo closer to actual than b4
     
  7. Jul 25, 2009 at 3:50 PM
    #7
    yosh2000

    yosh2000 Well-Known Member

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    ^ your right actually (edited my original post), im thinking of my situation, where my truck came stock with 245s.
     
  8. Jul 25, 2009 at 11:59 PM
    #8
    AFTaco

    AFTaco [OP] Well-Known Member

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    Thanks for the info. Sounds like a PITA. Is there a computer that can tell u ur actual speed with the biger tires?
     
  9. Jul 26, 2009 at 12:01 AM
    #9
    AFTaco

    AFTaco [OP] Well-Known Member

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    So ur telling me that if I put on 33's, my speed will be more acurate than my stock tires? 33's is what I was planning on going with anyways. Hope this is true.
     
  10. Jul 26, 2009 at 1:16 AM
    #10
    yosh2000

    yosh2000 Well-Known Member

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    not really a pain. if you have the money or mechanic knowledge its not bad at all.

    there are no computers that will correct this to my knowledge. here is a calculator that you can play with different tire sizes and it will tell you all the dimensions and % difference.

    EDIT: and after playing around with it, i take back what i posted earlier...33s and stock gears will have your speedo read slightly slow, but you should be ok.
     
  11. Jul 26, 2009 at 2:50 AM
    #11
    Illuminaut

    Illuminaut life's a conspiracy

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    In the 2nd Gen 4x4 up to +5% on the speedometer/odometer is normal, stock from the factory.

    Going up from the stock 31" to 32" tires usually corrects the discrepency just about perfectly... :D
     
  12. Jul 26, 2009 at 6:37 AM
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    Rocketball

    Rocketball If The World Didn't Suck, We'd All Fall Off

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    The end result is the same.
     
  13. Jul 26, 2009 at 6:51 AM
    #13
    brian

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    with my 285/70/17s (perfect 33" OD) my speedo is 3-4 MPH slow. Thats quite a bit off. The odometer is usually about 30 miles off at a fill up too.
     
  14. Jul 26, 2009 at 6:53 AM
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    Burgman

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    brian thats what mine is off at 65, so iguess it just flips which way its off
     
  15. Sep 30, 2009 at 6:53 AM
    #15
    Jwortley

    Jwortley New Member

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    hypertechs inline speedometer calibrator module will make the adjustment. All you do is program in the new tire size and connect it to the speedometer to fix any discrepencies created by the tire size or the rear gear ratios
     
  16. Sep 24, 2014 at 8:57 AM
    #16
    PackMatt

    PackMatt PackMule

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    I put 285/70 r17 on my 2014 4x4 and I was told regearing from my stck 4.10s to 4.56s would put the speeddo correct, but I went with 4.88s and it runs so much better than before. I have a 4 cylinder.
     
  17. Sep 24, 2014 at 9:02 AM
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    geekhouse23

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  18. Sep 24, 2014 at 9:13 AM
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    tacoflaco

    tacoflaco Well-Known Member

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    Hypertech makes a plug and play device to reprogram/recalibrate the speedo. Easy to use and inexpensive as well.
     
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