Hose in on one side and out the other! This above diagram is showing an external type wastegate, but same thing applies for an internal type wastegate. This helps with keeping a steady boost curve that doesn't drop off severely at higher RPM. The second purpose is to bleed some of the volume of air flowing through the MBC. If this wasn't there the wastegate would be stuck open after the first time it made boost. One is to relieve pressure from behind the ball, when the turbo is not making boost. In the stem is a bleed hole that serves 2 purposes. One key thing to our MBC (Manual Boost Controller) is our bleed hole.
In our design, the stem gets screwed in and out of the body which changes the spring pressure on the ball. The adjustment to when the ball lifts (effecting boost) is the tension on the spring. When the ball moves off its seat, the boost flows through the boost controller and actuates the wastegate actuator. The ball simply delays when the boost gets to the actuator. Adjusting the tension on the spring adjusts when boost pressure pushes the ball off its seat. The spring behind the ball keeps the boost from getting past the ball. Boost enters the body but is blocked by the ceramic ball. How does our PERRIN Manual Boost Controller work? There are 4 main components to it, the body, stem, spring and ceramic ball. Manual boost controllers are simple, cost effective ways to increase boost.
These are mechanical devices that are set manually and have no feedback and are not connected to the ECU in any way. Starting with one of the simplest forms of boost control, lets look at a Manual Boost Controller. Boost pressure can be bled off in a few ways, using a mechanical bleeder type system with a needle and a seat, a small opening or bleed hole, or the more reliable and accurate way using an electromechanical solenoid. Think of this as tricking the wastegate as to what boost it's seeing. This in turn delays when the wastegate will start to open and control boost. In order to get more boost than the spring pressure in the wastegate actuator, pressure needs to be bled off or blocked from the hose going to the wastegate actuator.
Part 2 of Boost Control Systems Explained will hit on the most common ways of doing this. This is done by using different methods to change the boost signal getting to the wastegate actuator. In both setups, its possible get more boost from your turbo, than the wastegate spring pressure. Some of the diagrams in Part 1 were common items found on stock turbocharged engines, and some only found on aftermarket turbo systems. In Part 1, we describe the basics on how your boost control system works and the components involved. How do you get more boost than the spring pressure in the wastegate?
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