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Old 04-26-2003, 22:51   #1 (permalink)
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speedo calibration

When I had my dyno run recently, I learnt that my speedo was reading more than it should. I remember reading somewhere that this was a deliberate fordism to avoid speeding, but I would very much like it to display my correct speed - not only because I like to know that my instruments aren't telling me porkies, but also over the life of the car, I'd imagine that the odometer would read considerably more than the distance that the car has travelled (assuming they are related of course).

Is there and easy way of doing this? Can I get Ford to correctly calibrate the speedo? Do I need a different speedometer drive gear? or one of these expensive toys?

http://www.blackrobotics.com/yb_home.htm
http://www.chiptorque.com.au/101546.php

Thanks all
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Old 04-27-2003, 06:32   #2 (permalink)
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paulc,

dunno about your speedo, its only out a few k's so i wouldnt worry.
One thing people dont think about, is with new tyres, the speedo will be 1-2 k out.
Wear the tyres down about 1/2 way, and its going to affect the speedo around another km/h.
Same when changing from 15" to 16", theres about 4km/h difference.

On the other subject, how long have you had the xenon globes in your car?
Have they started to make the polycarbonate lenses go yellow?
All EF/EL had that problem, that if you put higher power globes in, the heat generated from the globe would burn the lenses, causing them to go milky / yellow.
Just wondering whether the xenons get as hot.

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Old 04-27-2003, 14:49   #3 (permalink)
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Hey 9psi EB,
Yeah I'm aware of the radius of the wheel/tyre influencing the speedo reading, it's out by 6kmph @ 100kmph ie speedo reads 100 but I'm only doing 94kmph. I'd like it more accurate than that!

Tyres on 15'' wheels
post number 23.

I've had the xenons in the car for maybe just over a month or so. No signs of yellowing or heat damage. I only really use them at night or arvo 'though. They look really funky!
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Old 04-27-2003, 20:58   #4 (permalink)
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Paulc, before I go changing the car, I'd want to be sure the Dyno is 100% true...
Have you changed the tyre size in comparison the the factory size?
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Old 04-27-2003, 21:01   #5 (permalink)
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Factory was 205/65/R15 and now I've got 215/60/R15 which are slightly smaller and would make the speedo read slightly fast.... however I'm happy with this tyre size and would like the car calibrated as is.
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Old 04-27-2003, 22:10   #6 (permalink)
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You could always ring a taxi company and find out where they get their's done from.

Cheers
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Old 04-27-2003, 22:12   #7 (permalink)
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Are the taxi speedos calibrated differently, or are you referring to the fact that they drive like they're equipped with a gas-turbine?!!!
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Old 04-27-2003, 22:34   #8 (permalink)
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ROTFL !... dont know about being calibrated differently, just know they have them done and they should tell you where to get it done :)

Have seen a car here in Adelaide think it was a VDO car advertising to check if your speedo is calibrated, try them to :)
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Old 04-27-2003, 22:35   #9 (permalink)
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VDO?
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Old 04-27-2003, 23:51   #10 (permalink)
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VDO Dayton.. they make lots of guages and stuff.... :)
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