What controls and turbo and its boost and pressure?

What controls and turbo and its boost and pressure?What controls and turbo and its boost and pressure?
wastgate and actuator...a bleed screw inbetween will up the power but also put strain on all partsWhat controls and turbo and its boost and pressure?
The turbo speed is primarily a function of engine rpm. As the engine flows more, the exhaust gasses drive it harder and the boost goes up.





Control is by a wastegate, that lets exhast gasses bypass the turbo, limited by a spring driven by intake pressure. Boost controllers change the intake pressure for which the wastegate opens.





For limiting boost, though, a blow-off valve is the whoosh you hear when a turbo'd car changes gears, and that's the excess intake pressure being vented to atmosphere.