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Measuring Speed re Speedometer +/-

JJ_Egan
JJ_Egan Posts: 20,281 Forumite
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A speedometer measures speed does anybody know one if modern service repairs for main dealers in this case Citroen are able to check a speedo without a rolling road .
Reason new car last week Citroen C3 Picaso is giving me distinct impression that speed is out by about 3 to 5 mph . That is reading 30 MPH where true speed is probably nearer 27MPH .
Based on one driving impression that i am driving slower than the speedo reads . GPS is reading roughly 3MPH under speedometer and limited tests with Your speed is type camera reinforces that .

jje
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Comments

  • jaydeeuk1
    jaydeeuk1 Posts: 7,714 Forumite
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  • forgotmyname
    forgotmyname Posts: 32,755 Forumite
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    Within acceptable tolerances. You can get speedo's calibrated but for 3mph is it worth the cost to you?
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  • reeac
    reeac Posts: 1,430 Forumite
    Ninth Anniversary Combo Breaker
    JJ_Egan wrote: »
    A speedometer measures speed does anybody know one if modern service repairs for main dealers in this case Citroen are able to check a speedo without a rolling road .
    Reason new car last week Citroen C3 Picaso is giving me distinct impression that speed is out by about 3 to 5 mph . That is reading 30 MPH where true speed is probably nearer 27MPH .
    Based on one driving impression that i am driving slower than the speedo reads . GPS is reading roughly 3MPH under speedometer and limited tests with Your speed is type camera reinforces that .

    jje

    GPS is, in principle, extremely accurate. The limit is your ability to drive in a straight line at a constant speedo. reading for, let's say, 100-200m.
  • Dave101t
    Dave101t Posts: 4,157 Forumite
    my gps says im 4mph slower than reality. means i can do 74mph and know its only 70mph. They are supposed to be like that.
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  • Strider590
    Strider590 Posts: 11,874 Forumite
    Speedo in the car can over read, but it's not allowed to under read.
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  • Hammyman
    Hammyman Posts: 9,913 Forumite
    If you want the speedo testing for calibration you need to find a centre that does VOSA HGV Tachograph tests. HGV and Coach tachographs have to be tested for accuracy every 2 years for both the speed and the odometer. They have a rolling road properly calibrated and will carry out a set of tests to tell you how accurate the speedo is at registering speed and the odometer is at registering distance.

    There are places that will recalibrate your speedo but its not cheap.
  • JJ_Egan
    JJ_Egan Posts: 20,281 Forumite
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    So its a rolling road needed then .
    Dont think i will bother let it get worse and put it under warranty .


    jaydeeuk1 >>the word is not mormon but very very close to it .


    jje
  • Hintza
    Hintza Posts: 19,420 Forumite
    10,000 Posts Combo Breaker
    JJ_Egan wrote: »
    So its a rolling road needed then .
    Dont think i will bother let it get worse and put it under warranty .


    There is nothing wrong with your speedo. Change your tyres that will have more effect than anything else. Every millimeter you scrub off your tyres will affect your speedo reading.
  • Outpost
    Outpost Posts: 1,720 Forumite
    Is any of this really worth the effort?
    :cool:
  • mikey72
    mikey72 Posts: 14,680 Forumite
    JJ_Egan wrote: »
    So its a rolling road needed then .
    Dont think i will bother let it get worse and put it under warranty .


    jaydeeuk1 >>the word is not mormon but very very close to it .


    jje


    It won't get worse. It'll not be covered under warranty either.
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