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larger tires, slower speed!

Discussion in 'Wheels & Tires' started by jczelusniak, Apr 5, 2010.

  1. Apr 5, 2010 at 2:40 PM
    #1
    jczelusniak

    jczelusniak [OP] Member

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    I put larger tires on my Tacoma, and as a result my speed is different then actual.

    How can the speedometer be adjusted for the new size tire?
     
  2. Apr 5, 2010 at 2:48 PM
    #2
    solus

    solus HOME!!!

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    can't... need scanguageII... I have same dilemma
     
  3. Apr 5, 2010 at 2:50 PM
    #3
    DeeKay21

    DeeKay21 Lieutenant Dan.

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    Same thing for me. I just use my GPS but I dont really care anyways as long as im in the general MPH's I want to be in.:cool:
     
  4. Apr 5, 2010 at 2:58 PM
    #4
    JDMcompliant

    JDMcompliant Professional Amateur

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    there is one way (albeit a very sketchy way).

    In my old '98 4Runner, I pulled out my gauges to do some work on the gauge face. To do that, you first need to pull off the needle. When pulling off the needle, you need to mark at what point the needle drops to (there should be a needle "rest" at 0 mph...if you remove it, the needle will drop a past the rest and stop.) You have to remember to put the needle back on at this exact point when putting your gauges back together.

    The last time I did this, I forgot to mark where the needle stopped. I guesstimated, and after I put everything back together, my speedometer was under by 5 mph. You can technically do this to compensate for the larger tires, but it requires alot of tedious work and trail-and-error.
     
  5. Apr 5, 2010 at 3:22 PM
    #5
    MY50cal

    MY50cal I think I'm getting the Fear.

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    Yes.
    ^ pretty sure that will not work with newer technology... when i did my dash mod i didnt mark any of the needles, all my gauges read right on except for the spedo. (lift, tires, ect ) gauge reading 70 - gps reads 75. just know your vehicle or use a gps/scangauge to show your true mph.

    im about 90% sure the only way to fix the reading would be to somehow re-cal the cpu.
     
  6. Apr 5, 2010 at 3:29 PM
    #6
    JDMcompliant

    JDMcompliant Professional Amateur

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    yeah, that's one thing i forgot to mention -- i don't have any experience with the new gauges. i see OP has an 09 as well.
     
  7. Apr 5, 2010 at 7:08 PM
    #7
    tuckr2

    tuckr2 Well-Known Member

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    Not positive about adjusting the speedo. Best bet would be contact a Speedo shop and see if they can assist. Many have purchased Scan guages. Also, GPS systems will help you with speedo readings as they are pretty accurate.
     
  8. Apr 5, 2010 at 7:11 PM
    #8
    Chad

    Chad Rand Paul 2016

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    You could always buy a hypertech calibrator.
     
  9. Apr 5, 2010 at 7:16 PM
    #9
    desertdude59

    desertdude59 CRAZY 4WHEELER

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  10. Apr 5, 2010 at 7:18 PM
    #10
    SurfInferno

    SurfInferno Dont be stupid, its not smart.

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    when i changed my speedo to blue with the LEDs i changed the speedometer because it was off by 5mph. Now it is correct
     
  11. Apr 5, 2010 at 7:35 PM
    #11
    Jason'sLawnCare

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    What about the odometer? There's got to be a way a dealer could change the calibration.
     
  12. Apr 5, 2010 at 7:40 PM
    #12
    08pretaco

    08pretaco Almost there

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    ^they dont want to deal with it haha
     
  13. Apr 5, 2010 at 7:56 PM
    #13
    tuckr2

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  14. Apr 5, 2010 at 8:05 PM
    #14
    kilgoja

    kilgoja Well-Known Member

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    it's not a big deal...i mean how big are your tires?...it's prolly only off like 2 or 3 mph....not gonna get a ticket for that
     
  15. Apr 6, 2010 at 12:53 AM
    #15
    MY50cal

    MY50cal I think I'm getting the Fear.

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    Yes.
    hmmm, we would like an explanation... :rolleyes:









    ... cause i say bullshit.
     
  16. Apr 6, 2010 at 2:05 AM
    #16
    Kyouto42

    Kyouto42 Iron Beard

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    Keep in mind from the factory it is wrong, usually going slightly larger puts it closer to actual real readings...
     
  17. Apr 6, 2010 at 2:45 AM
    #17
    TacoSupreem

    TacoSupreem Dirty Trucker

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    ^^^agreed
     
  18. Apr 6, 2010 at 3:13 AM
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    MiikeyD

    MiikeyD The Green Machine

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  19. Apr 6, 2010 at 3:25 AM
    #19
    T@co_Pr3runn3r

    T@co_Pr3runn3r XXXXXXXXXXXXXXXXXXX

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    Funny thing, my truck came with 285/60/18s (31.5") already on it. The speedo reads 70, the GPS says 68-69. Now that I have 275/65/18s (32.1") the speedo & GPS are in sync no matter what constant speed I travel. I wanna trust it but just doesn't seem right for some reason. Are the factory tire sizes 32" OD? Is it really just wrong from the factory as was stated? Why would that be? Same broke ass logic that puts shitty leafs, folding tailgate, squeaky slave cylinders and other such goodies on for years after they are known problems would be my guess.....or they just think they know everyone will be buying larger tires and are just being proactive?
     
  20. Apr 6, 2010 at 5:51 AM
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    stenyeart

    stenyeart Well-Known Member

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    x2
     
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