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Sensor Setup
Connect your sensor to a digital input on the ECU. Then, pick the pin in TunerStudio at Sensors -> Misc sensors -> Flex fuel sensor.
Fueling Setup
In Fuel -> Injection Configuration, configure Stoichiometric ratio and E100 stoichiometric ratio. Unless you're doing something very weird, 14.7 and 9.0 are the correct values respectively (pure gas has a stoich ratio of 14.7:1, and pure ethanol 9.0:1).
That's it! The firmware will now automatically vary the fuel's stoichiometric ratio based on ethanol content.
It's recommended to switch to lambda mode (File -> Vehicle Projects -> Project Properties -> Settings -> Lambda Display), as the target lambda table is multiplied by the current stoichiometric ratio to get the target air/fuel ratio.
Ignition Timing
Coming soon...
Boost Control
Coming soon...