it would turn on and off with a lil electric motor in side the blower
on the movie car when the blower is switched on they are just starting the engine as it is connected to the lower pulleys, via a small belt,
and when turning off they are just shuting the engine down
when its first fired up the blower revs with the engine in the movie
there is no way a 671 blower can be turned off and on when its a real one
i have an old V blower on my buggy and mine is connected with a long blower belt as per a real supercharger, if you look at the FX in the pics of one a the cars for madmax4 i have the same blower, but mine has a bracket made for the blower mounting, with the FX ute it seems to be on a tunnel ram. mine cant be turned on and off..
i prefer it to rev with the engine...

