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Thread: Speedo Reading Comments...

  1. #1
    spoons
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    Default Speedo Reading Comments...

    My speedo reads 80mph and my Tom Tom always reads a lower speed (usually around 72-75mph from memory)

    However, I read recently that car manufacturers are allowed by law to be acurate within 10% of the actual speed. It appears that some manufacturers take advantage of this law, as it is actually in their favour.

    What I mean is.. if a car manufacturer makes the speedo 10% innacurate deliberately, ie showing 80mph when you are actually doing 72mph.. it means that your odometer is then also 10% innacurate (ie showing that you have covered 80 miles in 1 hour when you have actually covered 72 miles).

    This then means that (going by your odometer reading) your car servicing will be required earlier and more frequently (by 10%). Multiply this across all the vehicles they sell in the UK and its a nice profit thank you very much.. and they are still within the law..

    I could never figure why car manufacturers couldnt be absolutely dead accurate with speedo readings with all the technology, scientists and physics etc. Now I know why.... money...

  2. #2
    Ex Vec-C Admin / Founder Duncan's Avatar
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    I don't think it's anything so 'clever' or sinister. I think it's purely so that they can guarantee that their speedos don't under read. If they were popping out cars that were under reading, they'd be getting all sorts of flack for it as the drivers would be ultimately the ones getting prosecuted for it.

    D

  3. #3
    Regular Member Ian's Avatar
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    dunno, every time I've been caught speeding my speedo has matched exactly the speed i was allegedly caught at!!!

  4. #4
    Regular Member Doug-SRidirect's Avatar
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    If they wanted to they could certainly make speedometers more accurate than they do. By making them over-read, they keep the customer happy with 10% better (apparent) fuel consumption and "isn't it quiet cruising at 80 dear"......when you're actually only doing 72!
    Actually my TomTom shows 68 when VX tells me 70 so I'm over-reading nothing like spoons. I'll be getting closer though, when I get my 225-45's fitted.
    Actually there must be a significant variation in accuracy between new (8mm) and worn-out (2mm) tyres. (Actually, I make that about 2%).
    Spoons, are you're tyres ready for replacement?
    Doug
    Last edited by Doug-SRidirect; 17th February 2006 at 13:33.

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