https://docs.emtronaustralia.com.au/engine-management/config/fuel/fuel-model-expansion-ratio/index.htmlFuel Model: Expansion Ratio 0: OFF 1: ON - EMAP1 Sensor 2: ON - EMAP Estimation Table 3: ON - EMAP Sensor 1/2 AVG This uses the of EMAP / MAP combined with the Static Compression Ratio to correct the VE of the engine at different loads. EMAP can be sourced from:Hugoen-us