I'm going to be brutally honest. The engine simulator audio is bad. The stock setup is too quiet at idle and too loud while revving, and it seems like the engine audio revs higher than the exhaust audio. It also has a really odd whine at high RPMs, and the only way I can describe it is that it sounds like an air raid siren. And no, I don't have a supercharger installed. The engine audio also needs a proper exhaust counterpart to sound more natural.
I would happily delete this review and re-review the mod once the engine audio gets reworked. That's the only thing that's ruining the mod for me right now. Even with the current exported audio, there's a lot left that can be done to make the engine sound closer to real life, and the main failing point for a lot of rotary engine mods on the repository are the engine sounds they use.
Don't let me discourage you. Get creative, don't give up yet!
Beta Ibishu 200RX / Diana type-RX 0.9.1.4
The legendary three-rotor powertrain, developed by the Ibishu Experimental Division