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+--- Thread: [ Question ] Throttle position vs MAP (/thread-41.html)
Throttle position vs MAP - Jared Hartzell - 12-24-2025
I was just curious if anyone else had noticed this in their naturally aspirated ships as well, it's something I always wondered about but never has been an issue.
My throttle position sensor reads accurately on the FADEC but anything above about 70% throttle position does not make any power difference and it's at full MAP by then, so I just never open more beyond that. Is this because the manifold pressure reaches ambient pressure at a ~70% throttle position, so opening further does not make it breathe any better? My DA ranges from 2,000' to 6,000' where I currently live. I never paid attention to throttle position when flying at lower elevations so I can't compare.
RE: Throttle position vs MAP - Tim Morris - 12-27-2025
(12-24-2025, 09:21 PM)Jared Hartzell Wrote: I was just curious if anyone else had noticed this in their naturally aspirated ships as well, it's something I always wondered about but never has been an issue.I would say that is true. My Non-turbo Bonanza at higher altitudes would only get Manifold Pressure up to ambient pressure. Always ran full throttle but used mixture to control the fuel flow / consumption. Your FADEC does that for you.
My throttle position sensor reads accurately on the FADEC but anything above about 70% throttle position does not make any power difference and it's at full MAP by then, so I just never open more beyond that. Is this because the manifold pressure reaches ambient pressure at a ~70% throttle position, so opening further does not make it breathe any better? My DA ranges from 2,000' to 6,000' where I currently live. I never paid attention to throttle position when flying at lower elevations so I can't compare.