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What does a 3 bar MAP sensor do?By monitoring intake manifold vacuum MAP (Manifold Absolute Pressure) sensors are able to measure the amount of load being placed on the engine. The sensor relays engine load output to the ECU, which in turn adjusts fueling for optimum performance and economy.
How much boost is 3bar?In a 3-bar sensor, you would have room for 28 psi of boost, and so on. Looking at this boost graph as an example, you see that the engine makes almost 35 psi of boost.
Does a MAP sensor control boost?A common misconception is that the MAP sensor is the same as a boost sensor. A MAP sensor measures absolute pressure whereas most boost sensors measures gauge pressure relative to atmospheric pressure.
How many psi should a MAP sensor read?At sea level, atmospheric pressure is about 14.7 psi (pounds per square inch). When the engine is off, the absolute pressure inside the intake equals atmospheric pressure, so the MAP will indicate about 14.7 psi. At a perfect vacuum, the MAP sensor will read 0 psi.
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