User Manual

Evolution FORD 4.6 and 5.4 Liter
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Tire Size
The Evolution has the ability to correct for changes in tire size. If you have
changed your tires to a different size the PCM will miscalculate vehicle
speed which can affect shifting as well as the speedometer. Correcting the
tire size will allow the PCM to accurately calculate vehicle speed and
odometer readings. You will not need to change the value displayed if you
are running factory size tires. After choosing to set your tire size, the follow
screen appears:
The numbers on this screen represent the circumference (in mm) of your tire
size. The default value the Evolution displays is the current value stored in
the PCM. Adjust the tire size by pressing the [UP] and [DOWN] arrow keys.