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Speedometer vs. Odometer

Discussion in '2nd Gen. Tacomas (2005-2015)' started by braggman7, Feb 15, 2010.

  1. Feb 15, 2010 at 8:21 AM
    #1
    braggman7

    braggman7 [OP] Well-Known Member

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    I noticed that my speedometer was a few percent off according to my GPS (Speedo- 75, GPS- 72). The first thing I thought was that the dealer calibrated my truck so that it would register more miles than I was traveling and my warranty would run out faster. But I checked the odometer against my GPS odometer and it was DEAD on (Odo- 100, GPS- 99.9). Anybody else notice this? What's the deal? Is my GPS or my Speedometer/Odometer off? Not really a big concern, in fact, it helps me out as I plan on increasing tire size which should straighten out the speedometer issue. Just curious if y'all have the same thing.
     
  2. Feb 15, 2010 at 8:22 AM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    The Speedo is a mechanical gauge getting its signal from the ECO/speed sonsors. There is going to be more error in it, than the direct signal to the ODO.
     
  3. Feb 15, 2010 at 8:23 AM
    #3
    steve o 77

    steve o 77 braaap

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    All speedometers are like that. They only calibrate it to within a certain % from the factory, usually reading a little faster than actual speed.
     
  4. Feb 15, 2010 at 8:35 AM
    #4
    braggman7

    braggman7 [OP] Well-Known Member

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    exactly what i wanted to know. gracias
     
  5. Feb 15, 2010 at 8:38 AM
    #5
    smuggiesrider

    smuggiesrider Well-Known Member

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    I read something about your tires affecting your speedometer accuracy.
     
  6. Feb 15, 2010 at 8:38 AM
    #6
    kjf216

    kjf216 Fitz

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    i noticed the same thing with my truck and GPS
     
  7. Feb 15, 2010 at 9:57 AM
    #7
    EnolaGaia

    EnolaGaia Well-Known Member

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    Well, yes ... Change the overall diameter of your tire and you'll throw off the speedometer readings.
     
  8. Feb 15, 2010 at 11:24 AM
    #8
    Janster

    Janster Old & Forgetful

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    My speedometer needle on the dash is off by 2mph.

    I have a scangauge and the MPH it pulls from the ECU - is dead on with the GPS.

    Soooo...that's telling me that the needle on the speedometer isn't calibrated properly to the numbers. No biggie.... as long as the computer is accurate, who cares about the needle.
     
  9. Feb 15, 2010 at 1:58 PM
    #9
    S-M-R-T

    S-M-R-T Well-Known Member

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    It is another of those penny saving acceptable margins of error in manufacturing tolerance. Pretty much all manufacturers speedos are slightly off so that they read slightly faster then you are actually going, but never slower. I have seen reports that they can be off by as much as 6% or more depending on the vehicle. I don't know what Toyota's allowable tolerances are but everyone can expect to be slightly off.

    Even on stock size tires as they wear down the speedo will read faster. Larger then stock tires will cause the speedo to register slower then you are actually going.
     
  10. Feb 15, 2010 at 2:09 PM
    #10
    mountain lion

    mountain lion Member

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    Good info to have!
     
  11. Feb 15, 2010 at 3:29 PM
    #11
    JKD

    JKD Well-Known Member

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    Setting the Scangauge to read MPH, it is dead on with the GPS. The speedo gauge itself is what's off.
     
  12. Feb 15, 2010 at 3:31 PM
    #12
    jtav2002

    jtav2002 Kenny Fuckin Powers

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    My previous vehicles were always dead on with GPS but yea my Taco is off by around 3 or so. Shows I'm going faster than I am going.
     
  13. Feb 15, 2010 at 3:45 PM
    #13
    usmrocks

    usmrocks Well-Known Member

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    just like she came in 1996
    my gps is a little faster than the all thevehicles i've driven it in.
    f250, accord, colorado, dakota, tacoma, camry
     
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