Calibrate Wheel Size - How To?

[Readymixer]

I have purchased some 18" factory wheels from a brand new F-150 that received new wheels. Since mine are 17" the wheel size will go up by 1". I know it's not a lot but I'm OCD and i want to calibrtae the Expy for the 18" wheels.

My brother told me that he was able to change the wheel size in his '93 F-150. Is there a way to change the default wheel size on the '03 Expy using the RESET, INFO, or SELECT buttons?

 

[green03]

The wheel size has nothing to do with it. It is the overall circumference of the tire that effects the speedometer.

I am not aware of any way of programming from the dash but I know you can change with most of the aftermarket programmers that add performance too.

Matt R

 

[Readymixer]

Take a look at this link. This is what I was trying to convey. Can this be done with the Expy?

http://fullsizebronco.com/forum/showthread.php?t=55005

 

[green03]

The newer trucks' ECM actually generates the speedo data. It can only be changed by reflashing the ECM. There is no longer a seperate controller. The trip computer, information center, and gauge cluster all get their info from the ECM itself across the data bus.
If you have a speedometer error (which you may not), most of the aftermarket programmers will take care of this for you.

Matt R