After start Enrichment, or ASE, is an initial, short lived duration of extra fuel enrichment to help the engine stabilise after cranking and initial fire-up.


ASE is triggered as soon as the engine RPM rises above the ‘Cranking Max RPM’ (typically 400), (found in the Startup>Startup Settings) and it then occurs for an amount of time, looked up in the ASE Decay Time table based on the coolant temperature. Generally, the colder the engine, the longer the duration of ASE.


The ECU will look at the required fuel calculated from all other factors, and then multiply it by the ASE Fuel Trim as soon as ASE begins, then taper this addition off evenly over the ASE Decay Time. If you wish to not use any AE, then be sure to set the ASE Fuel Trim to '1.0' across the entire table so it has no effect. Typical tables are already pre-filled for you in our basemaps.


You should tune ASE such that the engine is stable after initial startup, and usually reading slightly rich. If the engine bogs with light throttle presses in the first few seconds after starting, but gets better as the engine warms, then try increasing ASE by 5-10% increments.


The ASE Trim and ASE Decay Time Left DROs show how much ASE is effecting the fuelling.