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Might be Ok to synthesize the difference between 1 type of engine to another, but what about 2 different incline 4?
Also an article about creating engine sounds for games
http://www.gamasutra.com/view/feature/2935/capturing_engine_sounds_for_games.php
That's where the CFD comes in, you fully simulate the flow patterns through various parts of the engine (which differ from car to car, and "tune" to "tune") and then, for example, use the far-field pressure variations directly, either as samples, or as a basis for synthesis. Or at least, that's how I'd do it - I have no idea how Sonory is doing it.
Interesting article, there. 👍 Most of what he said wasn't really news to me, other than the admission that they have problems with dyno sessions and actually capturing the full range of a car's sound.