Re: Chart for OXS voltage=A/F ratio?

["Graydon D. Stuckey" <graydon@apollo.gmi.edu>]

On Mon, 5 May 1997, Gary G. Erickson wrote:

> I was wondering if anyone happens to have a chart (or just know off of
> the top of their heads) to show how the voltage from an OXS sensor
> relates to the air/fuel ratio that it's reading.

Theoretically, 0.5 volts = 14.7:1 air/fuel ratio.   Higher than 0.5 = 
rich and lower = lean.    That is _ALL_ you can take from an O2 sensor.   
They are not accurate outside of a 10% range around stoich (0.5v)   In 
practise though, you can use it to get a pretty good idea of how your 
engine is running.   The turbo Quattro with EFI runs best at about 
0.8v.   Most NA engines will make best tork at about 0.7v.

> I'd like to hook my multi-meter to the OXS output for a while to use as
> a poor man's mixture meter (ala the cyberdyne and K&N meters) to see how
> the setting's change over the RPM band.

That will work.   You'll also find after a while, that knowing the 
mixture is a nice piece of data to have.   I don't drive without it.

Later,
Graydon D. Stuckey 

"Cool name man!" - Jay Graydon   :-)