Odo....
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Senior User
Joined: Nov 2004
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From: Vacaville,CA
Odo....
So if your speedo needs correction when you install larger tires, what about your ODO? Does anybody have an equation on how to figure out the correct mileage for your truck?
T.I.A
T.I.A
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From: Kzoo
I'm pretty sure you can take it to the dealership and they can fix it. I think it costs around 50bucks.
For some extra money just by a programmer and do it yourself.
Mine is off a little but I have driven by the radar signs with the GPS and figured that my speedo was about 2mph over what I'm actually going with the larger tires.
For some extra money just by a programmer and do it yourself.
Mine is off a little but I have driven by the radar signs with the GPS and figured that my speedo was about 2mph over what I'm actually going with the larger tires.
New User
Joined: Feb 2009
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From: Marshall, TX
on the edge you have to figure out the circumference of your tire. if you have the manual it lists a few common sizes and also gives a formula to determine it. assuming that you still have 325/60r18 (as it says in your sig), your circumference is 2660. so now you need to go to power programming and choose which level you want and when it asks to "create a custom program?", choose yes and then enter your gear ratio and tire circumference. that will correct your speedo and odo.
Elder User
Joined: Dec 2006
Posts: 662
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From: CO
I would think the odometer and speedometer use the same pulse signal to generate their output, so you can't change them independently (unless you're an electrical genius and can futz with the electrical components inside them).
The chances of them matching exactly are pretty slim too, so you'd want to correct for the odometer and let the speedo fall where it may.
The chances of them matching exactly are pretty slim too, so you'd want to correct for the odometer and let the speedo fall where it may.
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From: Vacaville,CA
bigchief2472000,
I do have it configured on my Edge, but the Speedo gauge is still off...which would mean the ODO is off. I guess I just have to figure an algorithm for the difference of speedo to find the variable for actual mileage.
I do have it configured on my Edge, but the Speedo gauge is still off...which would mean the ODO is off. I guess I just have to figure an algorithm for the difference of speedo to find the variable for actual mileage.
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From: Kzoo
Oh I get it now, it took me a min/day to understand this. So your saying that after all of this time of the speedo being off then the odometer would in turn be off by a few hundred miles? I don't know that there would be anyway to correct it because isn't it illegal to mess with the odometers on vehicles? I mean it's not like you could ask them to spin it back a couple hundred miles.
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Senior User
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From: Vacaville,CA
only a few hundred even after putting 85k on the clock with larger than stock tires? I wonder if Ford compensated for the change in rim and tire package that comes with the FX4 by programming the correct rotation travel for the tires? Say PCM tune differently?
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From: Kzoo
A few thousand? is that better? lol...
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Joined: Jul 2008
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From: Newport, Wa.
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