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conceptually i tihnk of the mafs signal more like this:
MAFS--------SAFC-------ECU
and stock is just like this:
MAFS--------------------ECU
the safc intercepts the signal and modifies it how you want based on throttle position and rpm.
it basically lies to the ecu about how much air the mafs is reading. the ecu tells the injectors how much fuel to flow based on how much air the mafs reads, so if you modify the mafs signal, the injectors flow differently to match the signal.
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