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-   -   How Does a Speedometer Work? (https://www.ultimatecarpage.com/forum/showthread.php?t=8021)

silverhawk 09-29-2004 01:59 PM

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

DodgeNitroBIRM 09-29-2004 02:07 PM

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.

my porsche 09-29-2004 02:28 PM

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

digitalcraft 09-29-2004 02:38 PM

Both are basically right. My_porsche is talking about the theory and math used used, whereas the previous post is the actual mechanical application.

my porsche 09-29-2004 02:45 PM

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

Rockefella 09-29-2004 02:48 PM

[QUOTE=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[/QUOTE]
i thought it was the other way around :confused:

:Exige: 09-29-2004 03:21 PM

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.

my porsche 09-29-2004 03:21 PM

sorry, my bad, i meant the other way around sorry guys

my porsche 09-29-2004 03:23 PM

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

gps speedo eh? thats pretty cool

Rockefella 09-29-2004 03:39 PM

or you can use a calculator and a ruler. :D :D

Sweeney921 09-29-2004 05:04 PM

[QUOTE=Rockefella]or you can use a calculator and a ruler. :D :D[/QUOTE]
lol, that would take a while

KnifeEdge_2K1 09-29-2004 08:18 PM

[QUOTE=Sweeney921]lol, that would take a while[/QUOTE]

not to mention dangerous lol

fa22_raptor 09-29-2004 11:47 PM

[QUOTE=my porsche]sorry, my bad, i meant the other way around sorry guys[/QUOTE]

Nah, I think what you initially said was correct.

fpv_gtho 09-30-2004 12:55 AM

The Falcon uses the ABS sensors to determine speed..

:Exige: 10-01-2004 04:14 PM

[QUOTE=my porsche]sorry, my bad, i meant the other way around sorry guys[/QUOTE]

You got it the right way around .. thats what i was trying to explain


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