![]() ![]() The following vagcom vagscope image shows readings from my car with a healthy turbo, healthy maf and a sealed boost system So, to recap, without the engine running, the MAP will read a bar shown as 1000m/bar The MAF is an Mass Air Flow meter which measures the amount of air being sucked in by the turbo.The MAP is a Manifold Absolute Pressure sensor which measures the amount of pressure within the inlet manifold (connected to the ecu via a slim pipe from the inlet manifold as the MAP is within the ecu).the two are linked as the amount of air a turbo sucks is dirctly relatable tot the amount of air it can push into the engine I'll be talking in absolute pressure, this reading includes atmospheric pressure within the reading, atmospheric pressure is around a bar at sea level so on an absolute pressure sensor you will see a bar pressure without the engine running.so basically, take your reading, minus a bar from it and that is the boost level you are getting in the inlet manifold. 2) Also a great video showing how to trim fuel at idle for best mpg using vagcom hereģ) VAGCOM GUIDE: CHECKING MAF (MASS AIR FLOW METER) AND MAP (MANIFOLD ABSOLUTE PRESSURE) SENSORS.Ī quick look at what we are doing here.
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