A boost controller does exactly that, controls your boost level. How, by controlling the amount of manifold pressure getting to the turbo wastegate.
If you wish to increase your boost pressure (typically 7psi), the boost controller must modify the pressure
signal to the wastegate actuator.
There are two types of boost controllers; mechanical and electronic.
Mechanical (gated) boost controllers are easy to fit, simple in operation and require little maintenance.
Electronic boost controllers are a far more sophisticated, offering a host of boost settings mapped against different triggers. Electronic boost controllers require
special fittment and programming. They do give you the ultimate control over the boost curve with features designed for one thing, that one thing we all want, performance.
This programmable control means that you can increase the performance and response from your engine without raising the boost pressure. Electronic Boost controllers
also allow the user to control 3 different aspects of the boost curve; maximium boost pressure (set point), spool up rate of the turbocharger (gate pressure)
and reaction time of the controller (sensitivity).
How does a boost controller work?
There are 2 main parts of a boost control system on a turbo engine: the wastegate with actuator and the boost controller.
As far as waste gates go two types exist internal and external. Internal wastegates are found on the vast majority of turbo cars, where a flap-type valve is built
into the turbocharger exhaust housing and is opened by a remote diaphragm actuator. AN external waste gate usually a poppet-style valve attached directly to
The wastegate does as it name suggestsand wastes the exhaust gas bypassing the turbine wheel and limits the amount of boost. The actuators
are controlled by the boost pressure so as boost pressure increases it overcomes the spring pressure and opens the wastegate.
The boost control device is designed to reduce the pressure reaching the actuator, which it does by ‘bleeding off' a specific amount of air from the supply hose.
This can be done electronically through the ECU by pulsing a solenoid-type valve in the supply hose, or mechanically by placing a ‘controlled leak' in the supply