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  #1  
Old 09-29-2004, 01:59 PM
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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.
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Old 09-29-2004, 02:07 PM
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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.
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Old 09-29-2004, 02:28 PM
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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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Old 09-29-2004, 02:38 PM
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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.
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Old 09-29-2004, 02:45 PM
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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
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Old 09-29-2004, 02:48 PM
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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
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Old 09-29-2004, 03:21 PM
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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.
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Old 09-29-2004, 03:21 PM
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sorry, my bad, i meant the other way around sorry guys
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Old 09-29-2004, 03:23 PM
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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
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Old 09-29-2004, 03:39 PM
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or you can use a calculator and a ruler.
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Old 09-29-2004, 05:04 PM
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Quote:
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or you can use a calculator and a ruler.
lol, that would take a while
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Old 09-29-2004, 08:18 PM
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lol, that would take a while
not to mention dangerous lol
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  #13  
Old 09-29-2004, 11:47 PM
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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.
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Old 09-30-2004, 12:55 AM
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The Falcon uses the ABS sensors to determine speed..
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Old 10-01-2004, 04:14 PM
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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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