I also already have a wide-band o2 sensor mounted in the typical location, but was never able to fully satisfy the OEM ECU. I have a PLX converter box outputting a narrow-band signal, but never figured out the correct load resistor value needed in order to completely remove the original sensor. One idea I had was powering the new sensor from the original circuit... but I have no idea if the wide-band & narrow-band power requirements are the same.
Partial to do list:
- actually purchase the Microsquirt ECU.
- mount thermostat (Koso BF550023 with 22mm adapter)
- obtain fuel injector plug
- figure out if controlling the ignition timing is possible
- identify crank position signal. There's a plug near the front of the motor that should have it.