How does a manual boost controller work

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Boost pressure is delivered to the actuator via a small hose from the compressor outlet, thus forming a control loop. As the boost pressure rises, this pressure In turbocharged internal combustion engines, a boost controller is a device sometimes used to increase the boost pressure produced by the turbocharger. It usually features some form of manual adjustment, often an adjustment knob on top of the controller. Inside it there's a little ball and a little spring.