VX lean burn monitor - enhanced how to desired

[suspendedhatch]

Hah ha. That's not exactly controversial or anything. You certainly wouldn't be hurting my feelings by speaking the truth. Mine only came with a one wire O2 to my surprise. It's not actually a big deal and it certainly doesn't mean that the ECU doesn't run lean.

One wire O2 lacks a heater. The heater is used simply to get the sensor up to operating temperature sooner. And of course it's not a wideband but neither is the CA VX.

The CA VX lacks a wideband yet it runs lean. It's simply a matter of carefully tuned fuel maps and open loop. The wideband is only accurate to 18:1 mixtures, yet people have claimed that the ECU runs as lean as 25:1. If this is true then it proves that the ECU is running open loop at cruising loads and is probably only using O2 feedback for partial throttle acceleration.

O2 feedback isn't necessary but it's quite helpful to maintain optimal mixtures and correct for different conditions including worn out sensors and lack of engine maintenance.

As for the upshift light, it's pinned directly to the ECU. I'm sure the ECU does a simple compare and outputs power at the appropriate times. To know when you're in fifth gear it just needs to know vehicle speed and RPM. There's no reason for it to monitor the O2. It can just make a simple assumption based on load and RPM.