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MAF (mass air flow) compensates for pressure, temperature, humidity, and density.
MAP(manifold absolute pressure) only measures the difference between the current atmospheric pressure and the pressure of the air entering the cylinder.
Nissan went to MAF in 1984 with the then new 300zx in the USA. Heated wire in the incoming air stream with the resistance created by air particles passing over the wire precisely measured.
regards
mech
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