What Altitude does a Turbo KNOW?

by Glenn Dugger in 912 / 914 Technical Questions 7 years ago

Do Rotax Turbo engines sense atmospheric pressure only or both pressure and temperature?
Asked in a different way: Does it know pressure altitude or density altitude?

Re: What Altitude does a Turbo KNOW?

by James Ott » 7 years ago

James Ott

22 334 392

A turbo doesn't really "know" anything other than preset limitations on pressure (wastegate) and temperature. The turbine is powered by the exhaust gasses and spins freely to push/pressurize inlet air to the inlet manifold, the max pressure being limited by the wastegate/bypass. At higher altitudes and temperatures the exhaust turbine simply spins faster because the thinner inlet air resistance is less, the end result being a more or less constant inlet manifold pressure at any density altitude.

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Re: What Altitude does a Turbo KNOW?

by Glenn Dugger » 7 years ago

Glenn Dugger

4 20 3

Thanks James. After more reading, I see the 914 senses the temperature and pressure in the air box.

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Re: What Altitude does a Turbo KNOW?

by Ken Ryan » 7 years ago

Ken Ryan

28 369 968

There is also an ambient pressure sensor, although I am unclear as to its function.

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What Altitude does a Turbo KNOW?

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