The G4X BMWLink plug-in ECU is equipped with internal ignitors to meet the requirements of the factory wiring loom. (This means that ignition coils are wired directly to the ECU).

 

The internal igniter can drive 10 amps of current through each ignition channel. It is important not to exceed this current when setting dwell times or fitting aftermarket coils.

 

The G4X BMWLink plug-in ECU is capable of being used with an external igniter (6 channels) or with direct spark coils (with built in igniters). To carry out this upgrade each of the ECUs ignition outputs will require the following steps:

 

1.Disconnect the wiring from the ECUs ignition output to the ignition coil.

2.Wire an external igniter to the ECUs ignition output.

3.Fit and wire a 470 Ohm resistor between the ECUs +5V pin and the Ignition output. Make sure this the resistor and all connections are secure and well insulated.

4.Use PCLink to connect to the ECU. Navigate to the following area ECU Settings > Ignition > Ignition Setup > Ignition Main > Spark Edge and set the Spark Edge to Rising.

 

The ECU will now invert the ignition signal so that the external igniter will work correctly. The diagram below shows the correct wiring setup.

 

 

 

 

Notes

·Each ignition output requires its own pull-up resistor and igniter channel.

·470 Ohms is a guideline for the correct resistor value, the ideal value will depend on the external igniter being used.

·The Spark Edge setting effects all ignition outputs, so all ignition outputs must match and either have a Rising or Falling Spark Edge.