I'm running a little lean I think - is there something in Datamaster that will give me a rough idea of just how much?

 

You can get a very rough indication of A/F ratio from the O2 sensor millivolt readings at WOT. Note the use of the term "VERY ROUGH". Stock narrow-band sensors are not intended to be accurate at the A/F ratios you need for max power/torque. I have some comments on the kind of numbers you might see in my online scanner writeup:

http://members.aol.com/InjuneerZZ/ScanMast.htm

 

Thanks Fred