Rotary engines don't like sustained heavy (audible) detonation, but mild detonation at light loads isn't a big issue. At least I haven't found it to be a big issue.
I am running ion sensing for both detonation detection and PPP detection. And it can easily pick up mild detonation. I'm setting it up to both pull timing and reduce boost pressure when detonation begins, I may set it up to add more water as well.
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