[Richard L]

The MAP sensor input is only accounted for 30% influency on the total flow. If you want to activate this option, you need to solder link the pads on the underside of the circuity board.

This input channel reads 0-5V, originally designed for reading the fuel rail pressure of a direct injection engine. Since 4x the pressure range only yields twice the flow range, so the channel only add 30% of the final flow.

There are occasions where user wants to put addition flow during boost ramp, so they use this input to read the signal from the manifold absolute pressure (MAP) sensor. Once the HFS-3 can read manifold pressure, the system can either be triggered by idc or boost pressure.