Note: This does not apply to the Atom or Monsoon ECU.

Rotary engines Metering Oil Pumps can be controlled directly from G4X ECUs. This involves wiring the pumps stepper motor and position feedback to the ECU.

Notes for wiring the stepper motor:

·The centre tap of both windings should be wired to the same power supply as the ECU to ensure correct flywheeling and to prevent backfeeding.

·One common pair of windings must be wired to Auxiliary Outputs 5 and 6. The other pair must be wired to Auxiliary Ouputs 7 and 8.

·Closed Loop Stepper Control needs to be set to Rotary Oil Pump and setup correctly

·Setting Stepper Calibration to Fully Closed should cause the motor to close the valve (so no oil enters the engine). Likewise, setting Stepper Calibration to Fully Open should cause the motor to completely open the valve. Once finished tested, set Stepper Calibration to Off.

 

Notes for wiring the motor position feedback:

·Any Analog Volt input can be used for the feedback position signal.

·The sensor ground should be wired to the ECU's sensor ground (which is grounded at the ECU) not directly to the engine.

·When wired correctly the position signal should have approximately 0.9V with the valve fully closed and 4.4V with the valve fully open but the range can be calibrated in Closed Loop Stepper Control and so isn't required to be exactly these values.

 

Instructions for configuring and calibrating the ECU for Metering Oil Pump Control can be found here, these must be followed exactly to ensure accurate oil metering and this MUST be done before attempting to start the engine.

 

Your nearest Link dealer can provide you with a factory metering oil pump control calibration table if required.

Series 6 RX7 Metering Oil Pump Pinout