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Powertrain Control Solutions
6.5.3 Vehicle Speed (VSS)
Vehicle speed is calculated from either from a driveshaft speed sensor or a sensor on a wheel or axle. Enter the tire size
as it is shown on the sidewall of the tire, such as 245/40/16. The software will calculate the tire diameter. Enter the fi nal
drive ratio or 1 if the signal is measured after the differential. Finally enter the pulses per one revolution of the wheel or
shaft that the sensor is reading. The dash is now ready to convert the input frequency to vehicle speed. Vehicle speed
should be compared to a known speed reading from a stock speedometer, a GPS device, RADAR, or measured time
over a known distance. If the speed calibration needs to be adjusted the pulses per rev value can contain decimal values
to achieve fi ne tuning.
Vehicle speed units (KPH or MPH) are determined from the global speed setting. Gauge ranges are 160 MPH, 200 MPH,
200 KPH, or 320 KPH.
6.5.4 Custom Speed Input
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