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A bleed-type manual boost controller simple mechanical and [[pneumatics|pneumatic]] control to allow some pressure from the wastegate actuator to escape or bleed out to the [[atmosphere]] or back into the [[intake]] system. This can be as simple as a T-fitting on the boost control line near the actuator with a small bleeder screw. The screw can be turned out to varying degrees to allow air to bleed out of the system, relieving pressure on the wastegate actuator, thus increasing boost levels. These devices are popular due to their negligible cost compared to other devices that may offer the same power increase.
A ball & spring type boost controller uses the force of a spring acting against the boost pressure to control boost. This is installed with one boost signal line coming from the intake somewhere after the turbocharger, and one boost signal line going to the wastegate. A knob changes the force on the spring which in turn dictates how much pressure is on the ball. The tighter the spring, the more boost that is needed to unseat the ball, and allow the boost pressure to reach the wastegate actuator. There is a bleed hole on the boost controller after the ball, to allow the pressurized air to escape that would otherwise be trapped between the wastegate actuator and the ball after it is seated again. These type of Manual boost controllers are very popular since they do not provide a boost leak, allowing faster spool times and better control than a "bleed type" boost controller.<ref>http://www.fiercecontrollers.com/uncategorized/bleed-or-ball-and-spring-manual-boost-controller/</ref>
There are several different designs of ball-and-spring controllers on the market that range greatly in terms of cost and quality. Common body materials are brass and aluminum vary from inline to 90 degree designs. Another design aspect is the ball valve seat which is critical for performance stability.<ref>https://www.precisionballs.com/ball_valve.php</ref>
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