To understand how a MAP-sensor works and what advantages it has over the standard Air Flow Meters (AFM) that came on our cars, or even upgraded Mass Air Flow meters (MAF), we have to examine how these devices generate a volume-air-flow signal to the Bosch Motronic computer (DME).
Air Flow Meters (AFM)
AFM - air-flow meters are the crudest form of sensing devices. It uses a mechanical flapper barn-door that is physically pushed aside by the intake air stream. The volume of this air-flow then determines how much the door opens. The door then is mechanically attached to a variable-resistor assembly that then sends a variable-voltage signal to the computer that roughly correlates to the volume of air flowing past it. However, there are some disadvantages to this method...
Manifold Absolute Pressure (MAP)
MAP - manifold-absolute-pressure (also known as speed-density) measurements combine simplicity in sensor design with the power of digital microprocessors to compute a simulated volume-air-flow signal that is sent to the stock computer. You can completely replace the entire stock AFM-sensor (or upgraded MAF-sensor) and their associated wiring with a simple vacuum hose. As far as the stock computer's concerned, it's seeing the signal from an actual stock Air-Flow-Meter. Thus the computer will inject the appropriate fuel-volume to produce the highest power possible. This MAP-sensor upgrade kit doesn't suffer from any of the drawbacks of AFM- or MAF-sensors and has some unique benefits as well...
If your still a bit confused on what MAP is then watch this handy video by our friends at Engineering Explained who try to break it down what MAP is.
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