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Discussion Starter · #1 · (Edited)
A standard car O2 sensor has a input voltage range from 0 to 1 volts measuring 17.0:1 to 12.0:1 Air/Fuel ratios. Correct? What is the difference with a wideband sensor? Does it measure a wider range? Is the input voltage over a greater range?

Also is the lower the A/F always best for more power? Seems there would be a too-much-fuel limit.

The output curve of a standard o2 sensor is anything but linear, it will produce .5V at approximately 14.7:1 A/F ratio, as it gets away from that point the voltage changes very little with large changes in A/F ratio. Exhaust temperature also plays a part in this.

Wideband o2 sensors will measure from ~9:1 to 20+:1 AF ratios with a more linear response curve. They are temperature compensated so EGT does not affect accuracy as much. Wideband sensors actually measure the mix while the "narrow band" ones act more like a switch to tell the ECU what side of stoich you are on (above or below .5V)

Do a search online and you will find more info than I am going to type here

Optimum power is found somewhere around 11:1 to 12.5:1 A/F mix depending on who you ask. I think everyone would agree that richer than this you are just dumping fuel (perhaps to keep detonation in check) and leaner than this you are taking a chance on melting some parts

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