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theory
Posted by davenew (more from davenew) on Sun, 4 Jan 2004 05:43:44
In Reply to: correlation between mass air and map?, kooch, Sat, 3 Jan 2004 12:36:51
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In theory, the air mass meter (AMM) and manifold absolute pressure (MAP) sensors should be related very closely. To get the proper air/fuel mixture the ecu needs to know the mass of air going in, which changes with air temp. The AMM measures the air and corrects for air temp. The problem with AMM is the output isn't linear in the higher air flows. THe MAP only gives pressure of manifold. The ecu can't get air mass from MAP without including output from separate air temp sensor. In my opinion, saab uses AMM and MAP to get best of both worlds. AMM is more accurate at off boost and low loads, while MAP and air temp sensor are probably more accurate at higher boost levels. Just guessing..
dave
posted by 68.10.24...
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