Hmm
If the MAF sensor is measuring how much air is going into the combustion chamber (this sensor is pre turbo don't forget...still got pipework/intercooler to go through) then what is the job of the MAP (Manifold Absolute Pressure) sensor on the IC/TB pipe??
Surely that sensor is more accurate in measuring how much air is heading into the intake manifold and chamber??
The total air volume/oxygen content hitting the combustion chamber is calculated by the maf and modelled in the ecu based on the requested boost pressure. The ecu knows that x amount of g/s through the maf will be compressed to y psi and will therefore equal x total air volume/oxygen content.
The MAP's job is to report to the ecu that requested boost is met and all in the boost pressure system is acting as it should. The ecu doesn't calculate based on actual psi, it calculates based on requested psi as long as there are no faults.
