[Ed Wright]

At idle and low RPM, 02 in the collector, it's useless. If you run mufflers there is no problem. On the 2 step it's going to look lean because of misfires. Misfires output oxygen due to incomplete combustion. 02 sensors only measure 02 content, software converts that to A/F ratios. In one primary you could miss a bad injector on that bank, of trash in a jet, until it's too late. In the collector you see an average of all four on that side. To me that is more useful than monitoring one cylinder. Unless you have one in each primary, I don't see that as the best way to go. One dirty injector and the average A/F is going to be lean on that side. Won't tell you which cylinder but will narrow it down.

Dynojet has one, called Wide band Commander that logs data so you can down load it (A/F versus RPM) after a run ot dyno pull. You can also log two other parameters, like for instance, TPS on a foot braked automatic car, and also intake Air Temp, etc.

I like the FAST stand alone wide band (also a version with dual sensors is available), but it would be nice if it logged versus RPM instead of just time. Both of those systems as well as my FAST XFI wide bands in the car and the A/F module on my chassis dyno all show the same A/F ratio on a given pull. You have to learn your tool, some like the one mentioned in the first post won't always agree. You have to find what your engine likes with your sensor. There is no magic number for everything. different fuels even show different A/F ratios in the same car with the same sensors. Like VP C11.