Fly Boomer Posted August 3, 2022 Report Posted August 3, 2022 2 hours ago, kortopates said: you can go to a higher altitude and do it at lower 55% power, but no reason to do it above 65% power Maybe they specify 65% because the test requires lingering in a place that's likely to drive cylinder temps too high. 1
enginenerd Posted August 25 Report Posted August 25 Run the GAMI test at the RPM you intend to operate. Everything about an engine cares about the RPM, not as much the manifold pressure. Runner lengths, cam, ports, etc- are all tuned to resonate and work together at a certain engine speed. Where manifold pressure does come into effect is the change of speed of sound- but it's so minor in an intercooled setup. Long story short, yes it would be ideal to tune at the exact right combination, or *gasp* have electronic fuel injection... But all other compromises in mind, I would recommend running your gami test at the RPM you intend to fly at and slightly lower manifold pressure to get under 65%- if you're worried about it. I've been designing intake manifolds and tuning modern EFI for a bit over 20 years- that's what I would do. 2
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