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The autotune function is invoked by either the autotune button in the tool bar, or by the shortcut of ctrl-t. Tuning a vehicle using the autotune function can be difficult, that is why the autofunction uses the boundaries specified in the lambda overlay settings.
The minimum and maximum lambda is the boundary in which the function will perform tuning on the fuel tables. This boundary is necessary to prevent the function from making changes when the injectors cut off, or other events which cause the lambda values to oscillate.
Maximum change from base map - this value is the maximum allowable percentage change from the base map. This value is to prevent the map from changing dramatically from your base map. The base map is set every time the calibration is saved or loaded.
Make adjustments every - this value is the time period the function must wait before making another change to the fuel maps. This delay is to help the lambda settle before reevaluating another change.
Autotune strategy - there are 3 strategies available for the autotune function. The first strategy is called closest cell, and it changes the map one cell at a time based on which cell is the most heavily weighted. The second strategy is called 4 weighted cells, and it changes the four highlighted cells based on the actual proportion of the cell which is being used. The third strategy is called precise cell, and it changes the map like the first strategy except it will only make a change if the actual MAP is within 15% of the load index of the most heavily weighted cell.
Play sounds when adjustments are made - this option is to play a high pitched sound when a fuel value is increased and low pitch sound when a fuel value is decreased.