agree,what he said^^^
Really, I'm not the guy who should answer this. But here is my basic understanding, which I will be forthcoming and say I could absolutely be totally off base here.
So after I set up the basic steps from the installation videos, I did a slight change to the low slope on the injectors.
Injector Dynamics are pretty well sorted, straight from the box. I wanted a touch more AFR on pump gas because Minnesota has e10 minimum in all grades. Now our stores advertise e15. So I bumped my AFR to 14.3.
So I believe that is my target AFR??? But I'm not 100%
Ok from that, the Pro-M uses a lambda load based map. To be honest, I'm even more less sure I know what I'm talking about, so be aware.
From that lambda load based map the computer will use feedback from the O2's to reach the target value. My guess is by adding or subtracting fuel. Pretty sure the load map locks in timing?? Please don't quote me!
That's my general understanding of how it works. I've had my car with this computer on the dyno plenty of times now. Most of the guys at the 2 shops I dyno at, all run Holley. Myself and my Holley friends say the car reads fine on the dyno.
I'm starting to change my thinking from AFR to Lambda. It's helping me better understand e85. Although it will be a while before I just let her eat on the corn. But I'm dabbling and getting more confident every day.
And yes, I'll second the comments about the Holley is just as fine on the street as it is on the track. I still don't fully understand the comment of Strip = Holley, Street = Pro-M?? I get it to a point, but yeah I don't know...
Honestly their all great systems, and Matt Cramer is right. If budget is a factor, today you can get some terrific systems at low cost. Heck, finance aside his stuff is pretty solid, period. It wasn't like this only a few short years ago.
Whichever you pick, it's a Win-Win for the consumer! And that's just beautiful!
P.s. From my horrible explanation of how the Pro-M's correct from O2's. I hope you can understand why I went with Pro-M? Cuz I should be the last guy tuning cars!!! And I'm ok with that. And now I don't have to do any tuning! And believe me, I'm fine with that too!!