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How accurate is the speedo...

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Tilt, Mar 30, 2009.

  1. Mar 30, 2009 at 4:37 PM
    #1
    Tilt

    Tilt [OP] Well-Known Member

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    Lyle
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    Here's an interesting item. I have a Garmin Nuvi 250 that I use in my truck. At lower speeds, the speed numbers match perfectly. If I'm driving through town at around 50 or 60 km/h.....the GPS say the same speed. However, at highway speeds I see a sure difference. And it makes me wonder which is more correct. For example; if I'm driving at about 120 km/h (speedo).....the GPS will show 117 km/h. It seems pretty consistant that once over about 105 to 110, the speed difference from GPS to speedo is about 3 or so km/h.

    Which would be more correct?

    (p.s. Yes, I'm Canadian....so all my numbers are metric)
     
  2. Mar 30, 2009 at 4:41 PM
    #2
    Blackened Taco

    Blackened Taco Well-Known Member

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    There is a tolerence on a speedometer, they are not 100% accurate, my GPS and speedometer does similar to yours. I tend to put more faith in my GPS. Either way it's a very small difference.
     
  3. Mar 30, 2009 at 4:42 PM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    GPS is gonna be more accurate than the speedo. Also, FWIW, the ECU reads the correct speed, and the ODO is pretty accurate, so the issue lies in the speedo only.
     
  4. Mar 30, 2009 at 4:43 PM
    #4
    Lentsnh

    Lentsnh Well-Known Member

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    According to my Scanguage my speedo is only about 2 MPH off from what the SC says. I heard that once you get a little bit bigger tires, that goes away
     
  5. Mar 30, 2009 at 4:46 PM
    #5
    Brunes

    Brunes abides.

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    It can- but by the same token it can go the other way depending on how big you go. Your speedo will register too slow (but you'd need some large tires for that)
     
  6. Mar 30, 2009 at 5:56 PM
    #6
    Blackened Taco

    Blackened Taco Well-Known Member

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    x2
     
  7. Mar 30, 2009 at 6:21 PM
    #7
    dwalden2

    dwalden2 Your mom goes to college

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    It's the same with me. If I'm goin 65 the GPS says I'm doin 67. I trust the GPS more than the Speedo.
     
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