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?
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.
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!
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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