You guys are always talking about how A/F gauges are a waste of money because they are not accurate! I was wondering if you feel the same way about the Nexus wideband.....Look....http://www.autometer.com/cat_gaugede...id=3609&sid=42

any help would be appreciated!

 

Wide band sensors can be accurate to 1% say +-0.2 AF.........however they average the 2 or 3 or 4 cylinders and may be more inaccurate depending on mounting location and distance to each exhaust valve set.

"The gas temperature to the sensor should never exceed 850 degrees C (about 1560 degrees Fahrenheit).
The sensor should never be run without power to the WB unit (a hot sensor burns off carbon residues)
Always have the long axis of the sensor perpendicular to the gas flow (stops sensor clogging)
Position the sensor vertically or at most between 10 o'clock to the 2 o'clock position (this avoids cracking the internal ceramic structure should moisture condense internally) .............

The sensor reads the partial pressure of gases in the exhaust and infers the AFR, rather than by measuring some magical AFR directly. This may be an issue on forced induction, and in particular, on turbo-charged engines.

AFRs will indicate richer than they are, causing you to run leaner than you think.
Lean AFR's will be richer (or less lean) than indicted. "