convert o2 millivolts to air/fuel ratio

[robztheman]

I was just wondering what the math is to convert the o2 millivolts to air/fuel ratio? I am just wondering and would like to know. Also while i am here does anyone know or can point me to a link where i can find out how to convert to a wide band?
thanks

 

[RmvBfrFlght]

For a NB O2 sensor:

> 450 mV == rich
< 450 mV == lean

For a WB voltage to AFR conversion it depends upon the unit being used. Most are also capable of being programmed for AFR range and the voltage range.

A common AFR/voltage range is 0V for 10:1 and 5V for 20:1

The conversion is then:

AFR = volts * 2 + 10

RemoveBeforeFlight

 

[Chuck Leeper]

Info..

This is a comparo of a bunch of O2 sensors.. All at the same time.
http://www.paceperformance.com/paceperformance/pdf/widebandshootout.pdf

 

[robztheman]

Thanks