https://docs.emtronaustralia.com.au/engine-management/config/air-mass/air-mass-model-emtron/index.htmlEmtron Air Mass Model Overview The Emtron Air Mass Model provides a flexible framework for constructing a custom air mass calculation strategy using one or two independent air mass calculation methods. Two independent calculations are available: Air Mass Model Calculation 1 Air Mass Model Calculation 2 Each calculation can be configured to use one of the following air mass calculation methods:Hugoen-us