I'm finally taking some time to get back into nistune. (Bought another project, had a baby, work stuff etc... life) and I was trying to lean out the first two columns of the fuel map. With the "O" flag off I cannot make the cell leaner than 14.7. With it on I can go leaner on the map but the O2 sensor feedback brings it back to 14.7 in real time.
I'm targeting 15.5~16 right now for coasting with the throttle just cracked to prevent engine braking.
I have not yet tried to disable the O2 feedback (raise temp, uncheck or unplug) so that the "O" flagged areas run the target ratio without being "corrected" by the sensor. But would I be correct in understanding that this is the only achieve the above?
Lean Tuning with or without o2 sensor?
Moderator: Matt
Re: Lean Tuning with or without o2 sensor?
leave O2 flag in map turned ON, disconnect sensor itself and adjust map value to reach your AFR, this is easiest way.... sometimes there are issues if you just change O2 feedback temp or so, best way is unplug sensor physically.
Re: Lean Tuning with or without o2 sensor?
Will this hurt the sensor since it is no longer heated?
Re: Lean Tuning with or without o2 sensor?
Interesting ... does this mean the O2 Flag is not working?
Re: Lean Tuning with or without o2 sensor?
This is normal. You cannot make the Nissan ECU cells leaner than 14.7:1 (ie go under the raw value 0) with O2 flag offwas trying to lean out the first two columns of the fuel map. With the "O" flag off I cannot make the cell leaner than 14.7
You would need to disable it completely