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On My other car VW Golf R32 we have oem build'in wide band lambda that are always working in closed loop even at WOT so it's pretty easy for the tunner. he just have to widen the range of fuel adaptation from 25% to 45% and then the fueling adapte automatically according to lambda reading.
About the timing the tunner put a few different map with first one very agressive for the E85 and then if their is knock because lower pourcentage of E85 it switch to more conservative map of ignition.
OK I simplify abit but that's the idea.
Have use this R32 Flexfuel tune since 80k miles with no problem and no headach about what blend of E85/Gazoline is in my tank it's all automatic the ecu adapte itself to whatever according to O2 reading and knock.
But I guess BRZ/FRS/GT86 do'y have wide band lambda porbe and are in open loop when at wot.
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