Wideband 02 sensor?

[blewbyu]

What is a wideband 02 sensor and how are they better?

 

[2-0turbo]

A typical O2 sensor in a car contains a circuit that is very sensitive to stoichiometric AF ratios. The voltage output changes abruptly from 0 volts to 1.0 volts as the AFR goes from lean to rich around the 14.7 stoich ratio. They are pretty worthless for determining an actual AFR, but work well in closed loop systems, allowing the computer to constantly jump back and forth across the stoich ratio. If you have a data logger, you can see this evidenced by the O2 voltage oscillating at idle and during other times of closed loop operation.

A wide band, on the other hand, outputs a signal from approximately 1.0 volts to 4.0 volts. See this site for a graphic representation of what I am saying. Once calibrated, this allows a specific voltage from the WB O2 to correspond to a specific AFR. They are an indespensable tuning aid.

 

[UndergroundR32]

http://www.techedge.com.au/vehicle/wbo2/default.htm

 

[ETE32TSI]

WHAT! Translation please...

 

[StockSpyder]

I use a wideband UEGO for my car now and theres quite a bit of noticable difference between that one and my stock one.. After retuning the Haltech a bit more you can tell the obvious differences between stock 02 reading and with my wideband, much more accurate, much faster readings.. the only bad thing is that they dont last quite as long..

 

[MustGoFaster020]

Originally posted by ETE32TSI
WHAT! Translation please...

A wide band can accurately tell you your actual A/F ratio, were as a stock O2 sensor is good for telling you that you are above or below 14.7:1. 14.7:1 is the stoichiometric ratio, were N/A's will make most power and all cars will get good fuel economy. In other words the stocker is a pice of ... and the voltage output will vary based on temp and many other variables.

To put it anothe way, what do dyno's tune to? A Wideband sensor and a bunch of other stuff, but my point is that on the dyno they tune turboed cars to 12:1-11.8:1 ration under boost and 14.7:1 while not, and then since it's on a dyno they can tell tou the HP.