Operation Manual

Transmission
Specify if your vehicle has an automatic or manual transmission.
Speedometer Calibration Factor
The speedometer calibration factor allows ProScan to compensate for incorrect
speedometer readings due to non-stock tire sizes. If your vehicle has larger or smaller
tires than stock and your speedometer has not been calibrated, you need to specify a
speedometer calibration factor so that ProScan can correct your speedometer readings.
ProScan provides a calculator that makes it quick and simple to calculate a calibration
factor for your vehicle. Click the “Calculate” button to open the “Speedometer
Calibration Factor Calculator” (Image 19). Enter the stock and current tire sizes to
generate a calibration factor.
Image 19: Speedometer Calibration Factor Calculator
* NOTE: ProScan cannot calibrate your vehicle’s dashboard speedometer.
Weight
Enter the weight of your vehicle including your own weight and the weight of any
passengers that will be in the vehicle during testing. If you don’t know the exact weight,
an approximate weight will suffice. Vehicle weight is used by ProScan to calculate
horsepower and torque.
Drag Coeff
This value represents the aerodynamic drag coefficient for your vehicle. As of ProScan
4.0, this value is not yet used in any horsepower or torque calculations. Therefore, you
can safely ignore this value at the present time.
Wheels
Enter your tire size. If you have different sized tires on the front and rear, use the rear tire
size if your vehicle is rear-wheel-drive, and the front tire size if front-wheel-drive.
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