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Thread: Speedo?

  1. #1
    Regular Member Messenger's Avatar
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    Default Speedo?

    Vectra C facelift

    Can anyone confirm that the speedo reads about 8 - 9% more than the actual speed ? I know its normal in most cars but as I am new to VX I just need it confirming or not.

    Thanks

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    Regular Member steve1975l's Avatar
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    It does read higher but as too how much I am unsure.

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Mine reads slightly high too, as will the vast majority of cars, if not all. Wouldn't say it is 8-9% though, and the variation between real and indicated speed will vary at different speeds.

    Best thing is to get a sat nav that displays speed and go off that.

  4. #4
    Regular Member steve1975l's Avatar
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    How accurate is sat nav?

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    Admin & Merchandise Manager bigmac's Avatar
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    Vehicle : insignia

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    Mines out by about 2 or 3 mph if my speedo says 70 my GPS SAT NAV says 67-68 as long as its that way and not under estimating the speed you will be ok

  6. #6
    Regular Member Tadpole's Avatar
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    Quote Originally Posted by bigmac View Post
    Mines out by about 2 or 3 mph if my speedo says 70 my GPS SAT NAV says 67-68 as long as its that way and not under estimating the speed you will be ok
    The higher the speed the more differential but not much. ..

  7. #7
    Regular Member solorider's Avatar
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    Vehicle : Vectra

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    it is law that the speedo must over read by a max of 10%,the speedo must not under read so you can have a speedo that reads 75mph doing a genuine 70mph but not a speedo that reads 70mph but doing a gunuine 75mph

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