CEM at altitude is broken. Pretty much everyone who has invested time into researching this aspect of the sim has come to the same conclusion AFAIK.
My current guess is that, in addition to the mixture settings, the turbo charger/blower modelling is also suspect. I set my personal altitude record this morning at 22,200ft for a hurri (DH prop) and above 20 thousand feet it was impossible to get a positive boost reading at all. It is like 2nd stage never kicks in.
Also, I find that I will always blow an engine with a fine pitch climb, even when I keep the rpm and temps well within limits. I can only keep my engine going if I change to coarse pitch before 7,000ft which is about where engine knock/vibration begins.
PS: all this with head shake off, because if I turn it on my whole plane vibrates like crazy no matter what I do up there Have you noticed that if you thottle back to idle, it glides smoothly and the vibration only returns when the throttle is increased again .
My fuel pressure gauge is also bust.
I think its important to be able to fly at historically accurate mission/patrol altitudes, and I'm not sure that this is feasible right now.
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