hey, i have a dumb question about superchargers
i was always under the impression that superchargers made boost in proportion to RPM.
ie, at 4500 rpm, you get 8 psi, at 5500 rpm, you get 12 psi, ect...
however, after actually driving a supercharged car for the first time, and watching the boost guage, i realized this isnt true.
at 3K, the car begins to make noticable boost on the guage, but this is at mid throttle.
when i close the throttle some, boost goes away.
now i know this is to be expected, but it got me thinking...
how does a turbocharged or especially supercharged car deal with low throttle situations.
if the blower is only spinning so fast, but the engine is sucking more air than it is blowing, the you have a massive vacuum, and a huge loss in efficiency.
is there some kind of releif valve built in to let extra air in so that there isnt a vacuum BEFORE the throttle?
also, how do power brakes continue to work in a turbo'd or blown car?
i thought the booster in brakes worked off engine vacuum, but if the car is making boost, then you have no vacuum, and no brakes...
i realize this is a dumb set of questions, but i just started thinking about it and dont have a answer.