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percentage to the injector pulse width. From the straight up or 12 o’clock position, the mixture can be
leaned roughly 50% by turning the knob fully counter clockwise or 50% richer by turning it fully
clockwise.
The knob is very useful in determining a rich or lean condition and is used in cruise flight for leaning
the mixture in LOP operations and we recommend it be mounted in all aviation installations. The
knob allows quick changes of mixture without re-programming in the event of some sensor or
fuel system malfunctions so should always be installed in aircraft. Be sure to complete all
programming with the knob in the 12 o’clock position so the ECU defaults to best power mixture with
the knob at 0% correction. Precise return of the knob to an exact position can be noted in gauge 2
mode under KNOB. A +%, 0, or -% indicates rich, neutral or lean position.
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