https://docs.emtronaustralia.com.au/engine-management/config/fuel/fuel-model-overview/index.htmlIn both Speed Density and MAF modes the ECU performs the following steps to calculate the final Injector OpeningTime. Calculate the Air Mass per cylinder. In Speed Density Mode PV = nRT is used to Calculate Air Mass. In MAF mode, Air Mass is measured directly from the MAF Sensor. In Throttle Mass Flow (TMF) mode the Air Mass is calculated by looking at the pressure ratio across the throttle body, calculating theHugoen-us