Ever since watching Mad Max, I've been curious about the possibility to switch a supercharger on or off, very much like what Max uses on the Interceptor in the movie.
The movie prop has an electromagnet automotive air conditioner-like clutch on the pulley, which allows the supercharger to be enabled and disabled by a switch.
My idea is; supercharger off = divert air away from supercharger (Y-pipe, with butterfly valve?), as the vanes on a roots supercharger will restrict airflow when not spinning.
Now here's a diagram I made in 5 minutes, showing what I think could work. (Not to scale!)
Now, if I were to ask, could something similar be done to turbocharged cars as well?