By placing a restrictor in the flow path, with the bleed on the other side, the air cannot pass fast enough to overcome the bleed, therefore the pressure will drop at the actuator and boost will rise.
This explains why if you install the controller backwards, you will not be able to raise the boost. The diameter of the restrictor hole is very critical, and the wrong size can affect spool-up, or cause boost spikes. GFB has spent a lot of time and development ensuring the restrictor is optimum, and the results show. These controllers still use a bleed, but the most common technique is to place a steel ball behind the restrictor hole, held shut by a spring.
The main problem with this technique is that since the restrictor hole is so critical to boost, placing a free-floating ball behind it adversely affects its performance. This then causes boost fluctuations, and if the spring is set incorrectly boost spikes. This is much easier to see on a dyno which accurately logs boost pressure. Hit enter to search or ESC to close.
All you ever needed to know about boost controllers. Raising the boost:. How boost control works:. Increasing the boost:. Bleed type:. Since turbochargers are becoming more common, upgrading turbo systems for improved performance is as well. One of the key upgrades to a turbo system is an adjustable boost controller, so we looked to the turbo brainiacs at Turbosmart to learn more about them.
The more air a turbo forces into the engine, the higher the pressure inside the intake manifold becomes, which results in a higher boost level.
A boost controller simply regulates the amount of boost the engine is fed. Excess pressure boost is sent to the wastegate where it is bled out of the system. In North America, boost is typically measured in PSI, though it can also be quantified in kilopascals or bars, or in vacuum in. Excessive boost pushes more air than fuel into the engine.
Read this. But, in more performance-oriented applications, a boost controller can be adjusted to varying parameters and ensure the optimal boost level. A mechanical boost controller also known as a manual boost controller is a set-and-forget type of setup. You dial-in the exact amount of boost you want via manual knob, close the hood, and the controller will maintain that level regardless of throttle position, engine speed, or atmospheric conditions.
We got this installation diagram from Turbosmart, it shows you a typical turbo system with a manual boost controller and an external wastegate. If you own a turbocharged vehicle, chances are you stumbled across this guide to learn about raising boost. By increasing boost, you are increasing the amount of positive pressure that is entering your engine at any given time. By eliminating your stock or factory boost control and installing a manual boost controller, you can raise your vehicle boost.
Never attempt to increase boost without a boost gauge or pressure gauge to measure. Installing and adjusting a manual boost controller basically blind to the real time boost levels in your engine is not a good thing. There are typical two different styles of manual boost controller. The most popular one is the ball and spring style, which I just described and the bleeder style of boost controller. Bleeder style boost controllers slowly meter out pressure to the desired pressure.
Who wants to increase turbo lag without increasing horsepower? In this application, one can safely say that bleeder style boost controllers are a boost leak. Meaning a failure or breakdown of the system, which again makes them unpopular for modification. Contrary to popular belief, there is no single one style of manual boost controller however. There are many people that believe their ball and spring MBC uses a vent system via the holes in the side of the housing.
These are designed as blowback holes, and only when the boost pressure is achieved will it leak. This does not change the fundamental operation of the ball and spring manual boost controller. Need to find some of the best manual boost controller on the market?
Want to find the manual boost controller basics and components? Check out our store or one of our favorite bang for your buck boost controllers. Want a simple guide to building a manual boost controller? Check it out here. This site uses Akismet to reduce spam.
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