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Speedo accuracy question

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

  1. Oct 15, 2010 at 7:36 AM
    #1
    Rodallg

    Rodallg [OP] Well-Known Member

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    My observations on my new to me 09 with the stock tires compared to my GPS shows the following. My speedo is about 2 mph faster than gps but the odo is the same after 32 miles and watching the 10ths of a mile roll over it was even. Any thoughts?
     
  2. Oct 15, 2010 at 7:40 AM
    #2
    Bryan07sport

    Bryan07sport Well-Known Member

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    Is it 2 miles faster at all speeds? because then your needle is just off. If it get progressively more off the faster you go, than the tire ratio is a little off. Sounds to me like needle adjustment.
     
  3. Oct 15, 2010 at 7:42 AM
    #3
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    Mines the same way and there have been threads on this. It seems like just the way the 2nd Gens were built. No idea why...
     
  4. Oct 15, 2010 at 7:57 AM
    #4
    Janster

    Janster Old & Forgetful

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    It's normal..... the speedo needle (on the dash) is not calibrated properly to the numbers (per say).

    I have a Scangauge which takes the info directly off the ECU and the speed on the Scangauge is accurate to the GPS. However - the dial on the dash shows 2mph fast.
     
  5. Oct 15, 2010 at 8:24 AM
    #5
    Rodallg

    Rodallg [OP] Well-Known Member

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    Great info, thank you.
     
  6. Oct 15, 2010 at 9:38 AM
    #6
    DGXR

    DGXR Well-Known Member

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    Has to do with something about the computer converting the signal from digital readout (odometer) to analog readout (speedometer) makes it a small percentage off. Seems in this day & age of technology they could make it a more accurate conversion. Someone else said Toyota deliberately does it for safety because so many owners put on larger tires. But the odometer is accurate with the stock size tires, that's all I care about.
     
  7. Oct 15, 2010 at 9:39 AM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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