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Evolution
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.
The following table will help you determine your tire circumference by
matching your tire size with the common sizes listed. For example, if your
tire size is 285/ 65-18, the value (circumference) you enter into the Evolution
is 2600. You may also use the formula provided to determine your
approximate tire circumference. Finally, you may also measure your tire's
circumference by marking your tire and rolling it one complete revolution
and measuring the distance in inches or millimeters. If you measure in
inches, multiply the distance by 25.4 to convert to mm. (ex. 91.3 inches x
25.4 = 2319 mm). The range of change is from 2000mm to 3500mm in
increments of 1mm.
Width Ratio
Rim
265
70
16
275
70
16
305
70
16
215
75
16
245
75
16
265
75
16
285
75
16
295
75
16
305
75
16
315
75
16
325
75
16
265
70
17
285
75
17
315
75
17
275
65
18
285
65
18
285
60
18
325
60
18
Caution: When adjusting the following values, it is highly advised to make
gradual changes as opposed to aggressive changes. This will help avoid
possible powertrain damage.
Idle Speed
This adjustment modifies the base Idle Speed of the engine. Select the RPM
you would like to add to the base idle speed. For example, if the normal base
idle is 600 RPM and you want 725 RPM, set the option value to 125 RPM.
(600 + 125 = 725) This option will only raise the base idle, not lower it.
Idle speeds above 800 RPM may cause vehicles with
WARNING
automatic transmissions to "creep" when stopped while in gear, requiring
additional pressure on the brake pedal in order to keep the vehicle
stationary.
Circumference
2441mm
2485mm
2617mm
2289mm
2430mm
2524mm
Circumference Equation:
2618mm
[(width * ratio * 0.02) + (rim * 25.4)] * 3.1415
2666mm
Steps:
2713mm
1. Multiply Width, Ratio and 0.02
2760mm
2. Multiply Rim and 25.4
2807mm
3. Add Step #1 with Step #2
2521mm
4. Multiply Step #3 with 3.1416
2698mm
5. The result will be the circumference of your tire in mm.
2840mm
2559mm
2600mm
2510mm
2660mm
17
Tire Size
33
2632mm
35
2792mm
37
2951mm
38
3031mm
FORD 4.6 and 5.4 Liter
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