Wide band O2
Honda-Tech Member
Joined: Jan 2000
Posts: 460
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From: Ft. Lauderdale, FL, USA
Re: Wide band O2 (fastestdriver)
It has to do with the characteristic of the output of the sensor. The stock/oem sensor is effectively constant for values higher or lower than stoich, so the computer can only tell wither it is richer or leaner than 14.7:1. The output of a wideband sensor is a ramp, allowing the controller to differentiate among values over a wider range (hence the name) of O2 levels.
If you can get ahold of a voltage vs output plot for each sensor it is easy to see why. I have one for a bosch wideband that i could scan if someone has a stock one to compare to.
The money for a wideband isn't in the sensor, its in the heating and temperature calibration side of things. Output voltage is a function of both oxygen content and temperature so the entire map must be characterized and accounted for to get any meaningful data.
If you can get ahold of a voltage vs output plot for each sensor it is easy to see why. I have one for a bosch wideband that i could scan if someone has a stock one to compare to.
The money for a wideband isn't in the sensor, its in the heating and temperature calibration side of things. Output voltage is a function of both oxygen content and temperature so the entire map must be characterized and accounted for to get any meaningful data.