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What Altitude does a Turbo KNOW?

  • Glenn
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4 months 2 weeks ago #16392 by Glenn
Glenn created the topic: What Altitude does a Turbo KNOW?
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?

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4 months 1 week ago #16409 by James Ott
James Ott replied the topic: What Altitude does a Turbo KNOW?
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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4 months 1 week ago #16412 by Glenn
Glenn replied the topic: What Altitude does a Turbo KNOW?
Thanks James. After more reading, I see the 914 senses the temperature and pressure in the air box.

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4 months 1 week ago #16418 by Ken Ryan
Ken Ryan replied the topic: What Altitude does a Turbo KNOW?
There is also an ambient pressure sensor, although I am unclear as to its function.

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