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Thread: Speedo

  
  1. #1
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    chrispk's Avatar
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    Speedo

    Just a little question, recently got portable sat nav and have it with the set with the speed on.
    Noticed that when i get to about 40mph there starts to be a difference between car speedo and sat nav. So by time am at 70mph on the car speedo sat nav says am only doing 65mph.

    Is it the speedo that could be faulty.

  2. #2
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    buckle's Avatar
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    No the Sat nav is just more accurate, most car speedos will over read slightly, and is perfectly normal.

    Just gives you a bit of a saftey margin, as you wouldn't want it to under read

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    oh ok that good then . And yea wouldnt want it to do that. Cheers

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    Speedometers are legally required to be accurate or over-read ie must not under any circumstances under-read - I think the requirement is between 0% and 10% fast, plus 2mph.

    To cope with slightly difference tyre diameters, manufacturers deliberately have them set a bit fast.

    Sat nav is accurate, but only at constant speed - inaccuracy comes in during acceleration and deceleration.
    Maintains:- Vectra Design 1.9CDTi
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    Enigma ???'s Avatar
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    All correct by the above post. But if you happen to get a speedo out of an emergency vehicle this is accurate and 35 MPH will be 35 MPH

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