WhiTek
SPEEDOMETER
INSTALLATION
Speedometer
installation comprises three steps:
1.
Install speedometer sensor.
2.
Inform MCU that sensor is installed and select display mode
(Options submenu).
3.
Calibrate sensor over a 125-foot measured course (Setup
submenu).
The
speedometer function is designed to accommodate a wide variety of speedometer
sensor types. Since these sensors can
vary widely, speedometer accuracy will vary according to the type of sensor
used. Generally speaking, the more
pulses per unit distance that the sensor outputs, the more accurate will be the
speedometer. If using a bicycle type
sensor, it might be necessary to use multiple triggers on the wheel to achieve
the desired accuracy. The speedometer
has a 1/2-second-update rate, which works best with high accuracy sensors.
The
electronic hardware is compatible with both Hall effect
sensors and reed-switch sensors. The
Hall effect sensor requires a control voltage and a
return, and outputs a sensor signal that is either the control voltage (+5V,
available from the MCU) or 0 volts. The
reed-switch sensor provides a signal that is either an open or closed circuit. Late model Harley-Davidsons have a Hall effect sensor output from the transmission. This provides a high accuracy signal (many
pulses per unit distance). Early model
transmissions that have a standard speedometer cable output can mount a
standard speedometer sensor in either reed switch or Hall effect
models. These are standard automotive
aftermarket parts. The Hall effect devices are typically four times as accurate as the
reed switch devices. Intermediate model
transmissions can often be modified to mount the modern Harley speedometer
sensor. This requires some machine work
on the transmission. A bicycle style
sensor can be mounted to sense magnets on the wheel. The more magnets, the more accurate the
speedometer will be, especially at low speeds.
The magnets should be evenly spaced on the wheel.
Refer
to the drawings below. The sensor output
should be connected to J6-6 and the sensor return connected to J6-4, for either
reed switch or Hall effect sensor. Power for the Hall effect
sensor is available at J6-3. Run this
wire with care, because a short in it will disable the Engine Control
System. If a reed switch type sensor is
used, the wiring polarity doesn't matter.
After
the sensor is installed, it is necessary to tell the MCU that the sensor is
installed. This is done in the Options
submenu, toggle the SPEEDO SENSOR command so that it says INSTALLED. This will make the speed available in a data
display window. Metric or American
display modes can be selected in the Options submenu. Metric mode displays speed in Kilometers per
Hour (KPH), altitude in Meters, and temperature in degrees Celsius. American mode displays speed in Miles per
Hour (MPH), altitude in Feet, and temperature in degrees Fahrenheit.
Next,
the sensor must be calibrated. This is
done using the START SPEEDO CAL and END SPEEDO CALIB commands in the Setup
submenu. Calibration requires a 125-foot
(38.1-meter) course. Using a tape
measure, make two marks 125 feet apart, somewhere where the motorcycle can be
driven or pushed. If the calibration
course is laid out on a slight hill, it will be easy to coast from the first
mark to the second mark. Move the
motorcycle such that it is aligned with the first mark. Set the display to the START
