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 | HKS Boost Controller Kit |
Boost Controller: The purpose of a boost controller is to create a "controlled leak" in the feedback line to the wastegate. This effectively "tricks" the wastegate into sensing a lower pressure than actually exists, therefore delaying the opening of the wastegate. In turn higher boost pressures to be achieved.
| A Turbo simply consists of an exhaust wheel and a compressor wheel connected together, exhaust gases from the combustion turns the exhaust wheel which in turn spins the compressor wheel. The compressor wheel then crams more air into the intake, creating boost pressure.
If left alone, a turbo would just keep spinning faster and faster and could result in too much boost, which would cause engine components to fail. To regulate the amount of boost, wastegates are equipped on all turbo-charged cars. The purpose of the wastegate is to divert some of the exhaust away from the turbo (so it won't spin the exhaust wheel). A wastegate is simply a spring loaded valve, this valve opens when the intake pressure reaches a certain pressure and diverts some of the exhaust away from the turbo. Suppose the wastegate is designed to open at 7PSI of boost, then when boost reaches 7.1PSI, the valve opens and the exhaust from the cylinders are diverted away from the turbo's, and the turbo starts to slow down. When the boost drops to 6.9PSI, the wastegate closes and the turbo starts to speed up again. This happens rapidly and keeps boost regulated nicely at 7PSI.
The pressure at which the wastegate opens is the base boost pressure, installing a boost controllers will allow you to run higher boost. | Boost Controllers come in two basic forms.
Manual Boost Controllers (MBC)
A simple mechanical and 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.
Electronic Boost Controllers (EBC)
Adds an air control solenoid (electronically controlled valve (aka. ECV)) and/or a stepper motor controlled by an electronic control unit. The same general principle of a manual controller is present, which is to control the air pressure presented to the wastegate actuator. Further control and intelligent algorithms can be introduced, refining and increasing control over actual boost pressure delivered to the engine.
At the component level, boost pressure can either be bled out of the control lines or blocked outright. Either can achieve the goal of reducing pressure pushing against the wastegate. In a bleed-type system air is allowed to pass out of the control lines, reducing the load on the wastegate actuator. On a blocking configuration, air traveling from the charge air supply to the wastegate actuator is blocked while simultaneously bleeding any pressure that has previously built up at the wastegate actuator. | | :: Recommended Reading / Videos :: |
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| :: Recommended material containing aditional info about Boost Controller :: |
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:: Copyright 2003 - 2012 CarEcstasy.com / All rights reserved :: |
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