Description

If you ve been in the Subaru game for long, you re probably well aware that a 3-port Boost Control Solenoid (BCS) is considered my most to be a must have improvement before having your car tuned. GrimmSpeed has become the trusted brand in the BCS market, with tens of thousands of solenoids in operation today across the globe.

The 2015 WRX offers a unique change of pace, as the factory 2-port solenoid is mounted directly to the plastic turbo inlet and interfaces with an o-ringed feature, rather than a vacuum hose, but, if you re running an aftermarket turbo setup, you may no longer be utilizing the factory turbo inlet. This product includes the solenoid with fittings and connector, as well as a universal mounting bracket, rather than the machined adapter required by the factory turbo inlet. We ve also left the wiring harness longer to facilitate a number of different mounting locations, depending on your turbo setup.

The advantages of a 3-port boost control system vs. the factory 2-port system are readily apparent during the tuning process. The 3-port systems works by interrupting the boost signal traveling from the turbo to the wastegate. The factory configuration simply bleeds the signal from between the turbo and wastegate, which creates a system that is a bit less complex, but reacts more slowly and with less precision. The chart above shows two boost plots. The before is our 2015 WRX, dyno tuned by a third party protuner. The after is the exact same tune, but after the installation of the GrimmSpeed 3-Port BCS. As you can see, the addition of the GrimmSpeed BCS shows much tighter boost control and consistency. This is safer for your car and easier for your tuner.

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