narrow and wide band O2 sensors

[silver343124]

Whell O2 sensor is relly the anode and cathode in an solid electrolit and it produce electrical current when in a presense of oxygen.

Narrow band O2 sensors is simply that and in simplicity its voltage output gets from 0V (rich mixture, no oxygen) to 5V (lean mixture, much oxygen).
When wide band O2 sensors have an electric "motor" which adapt its "rpm" so anode-cathode output voltage is allways the same. So we really monitor these "motor" input voltage as our signal. When there is 0V to the motor, mixture is lean - exces oxygen and when there is 5V to the motor mixture is rich, lack of oxygen.
So the voltage output is in the same limit, only inverted.

So if one will change narrow band O2 sensor with wide band and add an integrated circuit which will inverted the signal, will the ECU still works?

[UncleBob]

narrow band O2's are 0-1V, 1V is rich, 0v is lean

WB requires a controller, mainly because the temp of the O2 is crucial to accurate readings.

You could install a LC-1 controller and WB, which has a narrow band output option from the controller....but I don't see what good it would do you, a car computer that is programmed for a NB, will treat a WB like a NB. You would need to replace the computer if you wanted to make full use of it, which is a very big waste for the end result.

WB's are great because they are very accurate, and manufacturers don't just use them to keep 14.7 (stoich), they can keep the engine in closed loop at WOT, unlike NB, and even tweak the AFR to leaner numbers in acceptable circumstances....but all of this requires a computer that isn't thinking that it has a NB attached

[silver343124]

the main reason is that I would like to instal AFR meter to my car and don't drill another hole in my down pipe. So I can change NB with WB that has a narrow and wide band output?

[UncleBob]

why wouldn't you want to drill and weld in an O2 bung? $10 and about 5 minutes of work. Way simpler than reinventing the wheel with the computer

If you don't have a welder, any exhaust shop could do it for very little money. Thats a very easy job