This project pretty much hit the limit of what you can do with a simple throttle body injected engine. Basically not a lot!

So time for a new test engine - Z18XE that comes with OEM Siemens 60-2 crank trigger, 1 tooth cam sync, 4 cylinder sequential injection, direct fire coil-on-plug ignition, electronic throttle control and hot-wire AFM.

The Rabbit Due Open ECU was in need of a tricky crank trigger test. The magnetic reluctor 60-2 seemed like a good start. So far so good, with the Rabbit ECU running fuel only batch-fire injection. The Siemens ECU is still running ignition and electronic throttle control.

In the coming weeks I am hoping to test the Rabbit ECU reluctor adapter (VR) circuit a lot more. One nice feature of the circuit is the ability to set the hysteresis thresholds in software depending on engine speed. So good pickup of a weak cranking signal along with high resistance to noise at high RPM when nasty VR cross-talk occurs.

Next step for the Rabbit ECU project is working with the hot-wire AFM. So far the car runs nicely but hooking up an AFR gauge will tell us more...