My opinion is that a wide and O2 sensor can be useful, but are more valuable on a dyno, than on the street.
I had imagined I would be able to get a nice straight line at the stoichiometric mixture on the display, but while you are driving a car, there are so many variables changing that it is really difficult to judge exactly what is happening at any given time.
IF you have additional information - like you would get with a Fuel Injection setup - you could correlate your O2 ratio to throttle position, gear, RPM, vacuum, etc. Just looking at a graph of O2 ratio, you don’t have all that other context.
On a dyno, you will have a constant load, controllable RPM, no unexpected accelerator pump shots, constant vacuum, etc.
If you look on my 5357 thread, I had a wide and O2 sensor, and posted some plots up. I got helpful feedback, but…. I found the plots to be less instructive than I had hoped.
Obviously, if you have a lot of experience evaluating this kind of data, it would be much more helpful!
But it is easy to put bungs in! You should do it!
Rocky