I can see 3 ways to approach it, but they are all more "sound design" or acoustics than programming. 1) Process recordings of real F1 engines at fixed RPMs to

I can see 3 ways to approach it, but they are all more "sound design" or acoustics than programming. 1) Process recordings of real F1 engines at fixed RPMs to seamlessly go from one to another. 2) Approximate the sound sources and what happens to them on he way to the ear, so: oscillators and noise generators passing through filters and delays to modify the spectrum. 3) A real attempt at modelling the sound sources and the acoustics of the enclosures and pipes in terms of "what happens to the air pressure variations here". Or use something already existing: https://www.krotosaudio.com/igniter/ https://www.krotosaudio.com/igniter/