Driveshaft RPM Sensor
The Driveshaft RPM sensor is used to measure driveshaft RPM. This information can be used to adjust engine parameters including, but not limited to: Fueling, Ignition timing and boost control. The Driveshaft RPM is also critical in the use of the Driveshaft RPM control when using the Haltech REM unit.
The Driveshaft RPM sensor bracket is typically mounted using a Pinion Support bolt, or threaded directly into your aftermarket differential carrier / pinion support. This sensor detects the number of pulses mounted in the Driveshaft RPM Split collar which is fitted on the round section of the tail-shaft yoke. You will need to measure the outside diameter (OD) of your tail-shaft yoke in order to determine what size "Driveshaft Collar" you will need. The most common sizes are 1.875" and 2.125".
Driveshaft collars are available with different numbers of magnets mounted in them. The minimum number of magnets recommended is 2, while 8 to 12 will offer the best resolution when using the Driveshaft control strategy.
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Wiring Tab
Connections
Driveshaft RPM Sensor Input Connection Type
An SPI (Synchronised Pulsed Input) must be used for the Driveshaft RPM Sensor
SPI
An SPI (Synchronised Pulsed Input) requires configuring of the edge and the type of Sensor to be connected.
Edge Select
Falling is used when the input is grounded when the switch is activated. Rising is used when the input is supplied voltage when the switch is activated.
Sensor Type
Set to Hall Effect for all switch inputs
Pullup
Enables a pullup if required to generate a voltage when the switch is off.
Display Tab
Warning Maximum
When the Driveshaft RPM reads above this amount, any relevant items on the ESP software will flash Red as a warning of high RPM.
Calibration Tab
Number of Teeth
The number of teeth per driveshaft revolution. This will be consistent with the number of magnets in the driveshaft RPM collar. Typically this will be 2, 8 or 12.
Diagnostics Tab
The settings in this tab allow limits to be set for the detection of either fault conditions, or conditions that could be considered to cause engine damage related to the Driveshaft RPM.
Operating Min
When enabled, the DTC C1049 will activate when the following conditions are met. If the Engine Protection function is active a DTC Severity level can be selected for this condition if desired. (Default = Disabled)
Minimum
The minimum allowable operating value for the drivehsaft RPM sensor
Operating Max
When enabled, the DTC C1050 will activate when the following conditions are met. If the Engine Protection function is active a DTC Severity level can be selected for this condition if desired. (Default = Disabled)
Maximum
The minimum allowable operating value for the drivehsaft RPM sensor
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