This sensor measures the MAP (Mean Absolute Pressure) in the intake plenum. This is the main sensor for the ECU to calculate the fuel amount which is injected into the engine at different conditions and load requirements. This sensor, however, does have its shortcomings when it comes to engines with overlap cams where the intake vacuum falls away at low RPM’s. Then the ECU need to rely on other type sensors like TPS or Mass volume in conjunction to air temperature, altitude and RPM’s. For multiple throttles this sensor also is inadequate but there is a feature that the ECU can use to remedy this. (See multiple throttle bodies.)

This ’calibrate’ button will only appear when the custom sensor is selected.

Only custom sensors can be calibrated. Click on it to adjust calibration.

If you click calibration this block will appear. The offset value will change the MAP reading. Adjust it to read the same as the barometric pressure of your altitude above sea level. Note: Remember to take temperature into account.

The Filtered checkbox can be used to smooth an erratic map sensor signal. It will average the current sample with the previous sample. The down fall is that it may create a minor flat spot under blip conditions. This needs to be corrected with the accelerator pump feature.

The sensor must to be set up correctly by selecting the Type and range under Engine Configurations.

Calibration is done in the firmware.

If the sensor is not used, uncheck it to free up valuable processor time.