Hmmm.
Unless its Alpha N, or Mass air, its pretty much speed density?
Alpha N is the dumbed down version of fuel injection, Usually its just throttle position and RPM, with maybe manifold vaccum(?). Pretty simple stuff.
A notch up the scale is Speed Density, in the case of the Fel-pro unit, Electromotive, ect. whatever, you program in the fuel and spark tables which are optimized for each individual application. the draw back (if any), A/F ratio is trimmed after reading the O2 sensors.
Problem with most Mass-Air, they are pretty much factory based systems which means limited resolution.
If somebody would come out with an increased resolution Mass-air system it would probably rock since mass-air measures actual air entering the engine
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