Hi All,
I've playing around with the switch points for the O2 sensors in the E38 ECU. B1515 and B1516 allow the setting of the O2 switch voltage to be adjusted depending on the "Airflow Mode". This seems fairly self explanatory, but there are no tables in the OS that describe the "Airflow Mode" or allow any changes to it. In the LS1 settings, there is a table that sets the "CL Mode" depending on the measured air gm/S, but there is nothing like this in the E38.
I'm currently running an ethanol blend fuel and would like to try tweaking the switch points a little depending on engine load, but 2 things are stopping me ATM.
- I have no idea what the "Airflow Modes" relate to.
- the settings in B1515 and B1516 don't seem to make a lot of difference anyway. I've tried varying them from 450mV down to 170mV and the averaged measured O2 voltage remains at 470mV
I've even looked at trying to go OL and use B0148 to make a pseudo "lean cruise" setting, but again, this has no effect on measured AFR. Has anyone got either of these working as expected, or is there more calibrations that we need before these will effect the final AFR?
Simon