strange mixture to fuel flow interaction
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I'm aware turbocharged piston engines often behave strangely in MSFS, but afaik leaning the mixture should never increase the fuel flow rate (I'm on V5.6 but there's no mention of mixture/fuel flow in any changelog so this is probably still an issue) https://youtu.be/RAwdOKeGoho
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I believe the turbocharger simulation was something that was improved in the latest MSFS Sim Update and may have fixed this issue, but the Turbo Arrow III/IV will still be using the turbo simulation from prior to that Sim Update, as we haven't got around to investigating any of that new logic just yet.
We do have this noted on our internal bugs/feature requests tracker and we'll investigate what is possible in a future update to the Turbo Arrow.
Mark - Just Flight