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Thread: Manifold pressure - Altitude effects
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Old 28th January 2012 | 12:12
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oggers
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Joined: Nov 2005
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From: Zulu Time Zone
Good question

Is my hypothesis correct?
I believe it is. OAT is lower so for a given MAP the manifold air is denser, therefore a somewhat lower MAP will restore the air/fuel ratio. Of course, the throttle is still being opened, but not quite as much as it would be to maintain a constant MAP.
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