The 14 psi would enter into port 1, and the solenoid duty cycle would bleed 4 psi of air pressure out port 3, making it so that only 10 psi came out of port 2. What this would do is cause the engine and turbo to now make 14 psi of boost. Let’s say that we set the boost control solenoid so that it bled off 4 psi of air pressure. The solenoid now can “bleed” some of that pressure from the turbo off. If you installed a 3 port electronic boost control solenoid in that wastegate reference line you could change the boost pressure the wastegate "sees". If you ran the vacuum line from the turbo directly to the wastegate, then when the turbo hit 10 PSI of pressure the wastegate would open and 10 psi would be maintained. For example: Let’s say you have a 10 psi spring in the wastgate. Using the method above, the 3 port solenoid is actually bleeding off boost through the third port causing the wastgate to “see” less pressure than the turbo is actually making. If you don’t know how a wastegate actuator works to control boost be sure to read our articles on Turbocharger Wastegates. Routing controller to single port internal wastegate or bottom port only of external wastegate We will show both methods below and also talk about the pro’s and con’s of each. With a 3 port boost controller there are two methods of controlling boost. Those ports can move fluids in or out of the solenoid based on what you’re looking to accomplish. What that means is that the solenoid has 3 ports of entry/exit available. What is a 3 port Boost Control Solenoid?Ī 3 port electronic boost controller is a controller that has 3 ports on it. While there are multiple ways of controlling boost pressure electronically, we will focus on the differences between 3 port and 4 port boost pressure control solenoids. If there was just one solenoid and one way of electronically controlling turbo boost pressure, than there wouldn’t be much to this article. This article will focus on electronic boost control and the solenoids that make this sort of control possible. Boost control can be done two basic ways: mechanically or electronically. With any turbocharged engine, boost control becomes one of the first priorities to making good reliable power. How a three port and four port electronic boost controller works and controls boost pressure 3 Port Vs 4 port boost controllers
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