Might want to give this one a little thought.
Mike, I don't recall ever seeing you on this board before. How is life after leaving Bo Laws?
I'm not sure on the OP question. I do know that changing timing will change the AFR. I suppose indexing the rotor could also make a change but I'd be surprised if it was significant. I'm not exactly sure why the AFR changes when timing changes. I suppose that if the combustion becomes more efficient it changes the signal on the booster.
With an EFI car when you change the timing the AFR stays the same. But, the fuel flow will change since the EFI system compensates for the change in AFR by adjusting the fuel flow. I've seen it work on the dyno but the percentage change is usually fairly small. Of course, the NASCAR boys would kill for a small percentage increase in BSFC.
