Originally Posted by GThalheim
I don't see a mixture control next to the prop and throttle controls. Does the EFI have a mass air flow sensor or something like that? Or does it use an algorithm?
That's the great wonderful thing about EFI--no need to futz about with a mixture knob like it's 1950
This system uses manifold pressure and RPM with a programmed fuel map. You can also schedule your ignition timing, and there's an optional "lean switch" function that leans out by a set amount and advances the timing.
There actually is a small mixture knob that you can use for initial tuning (dial in what you want, note the setting, and program it in), to lean manually if desired, or to compensate for an abnormal condition. But the great thing about it is that once it's set up, you shouldn't need to mess with leaning any more. For normal ops you'd just leave it at the halfway mark. In the pics it's right below the round programmer, next to the red-guarded switch in the center of the panel.
Ross is working on a closed-loop function that will adjust fuel delivery to meet a specified O2 sensor target. That's more challenging due to the need to handle sensor failure, and due to lead fouling of O2 sensors.