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Thread: How Does a Speedometer Work?

  1. #1
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    How Does a Speedometer Work?

    How Does a Speedometer Work? how accurate is it?
    i hope this isnt a re-post.

  2. #2
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    Well, that depends. What car are you talking about? In some newer Fords, they now have the Hybrid Electronic Cluster (HEC). It works by reading the speed from the output shaft of the transmission via a speed sensor. As with any programming, it's as accurate as the person who programmed it.

    In older Fords, there was a physical cable that went from the output shaft to the speedometer. It was as acurate as the person installing the little gear on the cable where the output shaft was at. Going up and down teeth on that little gear would move the speeometer needle up or down so many MPH (KM/H).

    Hope that helps.

  3. #3
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    i thought they were based on how big the circumfrence is on youtr tires, then calculated how many times per minute the tire is rolling the complete circumfrence, and then it calculated that into mph
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  4. #4
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    Both are basically right. My_porsche is talking about the theory and math used used, whereas the previous post is the actual mechanical application.

  5. #5
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    well put digital craft

    im not owned d-quick, you get the same tire DIAMETER! and if you do get alot smaller wheels the speedo says you are going faster than you are, if you get bigger, ythen it says slower that it is
    He came dancing across the water
    With his galleons and guns
    Looking for the new world
    In that palace in the sun
    On the shore lay Montezuma
    With his cocoa leaves and pearls

  6. #6
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    Quote Originally Posted by my porsche
    and if you do get alot smaller wheels the speedo says you are going faster than you are, if you get bigger, ythen it says slower that it is
    i thought it was the other way around
    Rockefella says:
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    David Fiset says:
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  7. #7
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    A turn of a small wheel goes a shorter distance than a large wheel, so a small wheel could turn 10 times and only go 10 metres but measure 20mph wheras a large wheel can turn 10 times and go 20 metres but will still only measure 20mph (just an example). Personally I'd just fit a GPS Speedo if i was that bothered about pinpoint accuracy, theyre as accurate as you can get nowadays.

  8. #8
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    sorry, my bad, i meant the other way around sorry guys
    He came dancing across the water
    With his galleons and guns
    Looking for the new world
    In that palace in the sun
    On the shore lay Montezuma
    With his cocoa leaves and pearls

  9. #9
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    yeah i realised that, i just had one of my alltoo often brain farts while typing

    gps speedo eh? thats pretty cool
    He came dancing across the water
    With his galleons and guns
    Looking for the new world
    In that palace in the sun
    On the shore lay Montezuma
    With his cocoa leaves and pearls

  10. #10
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    or you can use a calculator and a ruler.
    Rockefella says:
    pat's sister is hawt
    David Fiset says:
    so is mine
    David Fiset says:
    do want

  11. #11
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    Quote Originally Posted by Rockefella
    or you can use a calculator and a ruler.
    lol, that would take a while

  12. #12
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    Quote Originally Posted by Sweeney921
    lol, that would take a while
    not to mention dangerous lol

  13. #13
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    Quote Originally Posted by my porsche
    sorry, my bad, i meant the other way around sorry guys
    Nah, I think what you initially said was correct.

  14. #14
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    The Falcon uses the ABS sensors to determine speed..
    I am the Stig

  15. #15
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    Quote Originally Posted by my porsche
    sorry, my bad, i meant the other way around sorry guys
    You got it the right way around .. thats what i was trying to explain

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