Maybe i don't undestand because english is not my language, but i don't really grasp the fact that pressure output from the supercharger is dependant on "load"; probably because i dont understand the term.
The pressure should just depend on the engine RPM (wich determine the supercharger's RPM) and the throttle position (and of course external pressure). In the example of the car, the supercharger itself couldn't care less if the car is going uphill or downhill. Then if more "load" means that the engine RPM decrease, this will affect pressure output from the supercharger, but it's not DIRECTLY tied to load.
Then again maybe i undestand because of my bad english.
I think the discussion was about the fact that with constant throttle position and constant altitude manifold pressure drops with RPM
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