why do you guy's like a turbo vs a centrif Supcharger?

Mad Dart said
On a Turbo you bleed it off to reduce boost and keep it closed to increase it with the Wastegate or Gates that are Controlled Electonically "EFI" or Manually with Boost Controller "Blow Thru Carb"

The bypass valve's job is to bleed off the boost in the intake track when the throttle plate is closed, this is so the Compressor does not get abused and reduces compressor surge. The bypass or pop off valve should stay closed on boost while the throttle is open until the throttle is let loose and the Throttle Plate closes. Swoooshhhhhhhh sound.

exactly by pass valve does not control boost only excess boost in the intake tract it "by passes" it away from the turbo and closed throttle plates. a boost controller incrementally increases boost. any wastegate wether on a fi or carb car can be controlled manually

not all calibrations are set exactly at a certain boost level. the one currently in my car is set for low boost of 18(i can run down as low as i want) with spark and fuel tables to 29 turn the knob and away we go BUT i still need to pay attention to the gauges. i am not saying i am making the most power possible either without data logging and adjusting the tables but they are pretty spot on. lane changes with the throttle always scares oncoming traffic hahahahahaha

Norm