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  Product name :

Electronic Boost Control Solenoid 3-Port - SOLENOID ONLY - 2015+ WRX/FA20/2010-2012 LGT [057046]

  Carmodel :

Subaru 2015+ WRX/FA20/2010-2012 LGT

  Product number :


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  Description :

Electronic Boost Control Solenoid 3-Port - SOLENOID ONLY - 2015+ WRX/FA20/2010-2012 LGT

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Product Description

This product is not for use with the stock 2015 WRX turbo or other stock replacement turbochargers. This solenoid is for aftermarket turbo kits and as such, does not include the required adaptor for the stock FA20 turbo inlet. Please contact customer service via phone (612-379-0000) or email with questions!

An FA20 BCS for Aftermarket Turbos.

  • 1/4in Barbed Fittings - Matches the factory turbo and wastegate hose size
  • 3-Port Solenoid - Proprietary internal modifications prepare the solenoid for extreme conditions below the vehicle
  • Plug-n-Play Wiring Connector - Plugs directly into the factory wiring harness with no modification required
  • Flexible Design for aftermarket turbo inlets - No need to mount the solenoid elsewhere in the engine bay, increasing complexity and hose length

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 adaptor 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 3-Port Advantage

boost-solenoid-2015wrx-8-framed-1600.jpg   bcs-subaru-fa20-5-original.jpg

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.

Why GrimmSpeed?

The GrimmSpeed Boost Control Solenoid has been proven time and time again. With tens of thousands on vehicles across the world, tuners trust it and our customers love it. What you see here is the same great solenoid with millions of miles of real world testing with a longer plug-and-play harness and universal bracket, allowing you to adapt it for use with an aftermarket turbo inlet.

Tuning Notes:

Because this upgraded solenoid affects the way that your vehicle controls boost (that's the point!), it is always recommended that you consult with a tuner immediately following installation. It is not recommended that you drive the car in a way that builds boost without doing so. If you have any questions, don't hesitate to get in touch with us directly!


  • GrimmSpeed 3-Port Boost Control Solenoid w/ Plug-n-Play Connector
  • Laser Cut and CNC bent steel bracket, black zinc plated w/ stainless press-in nuts
  • Zinc plated barbed fittings, preassembled w/ anerobic sealant
  • 4ft of 1/4in Vacuum Hose w/ zipties
  • All necessary hardware


  • 2015+ Subaru WRX (utilizing barbed aftermarket inlet)
  • 2010-2012 Subaru Legacy GT (utilizing barbed aftermarket inlet)
  • All known FA20 Equipped Vehicles (utilizing barbed aftermarket inlet)

Install Guide

Installation will vary based on the turbo setup that you're running. Below is the installation for the stock turbo inlet, which will help get you most of the way there. Consult the manufacturer of your turbo kit for more detailed directions or feel free to contact us directly for guidance.

GrimmSpeed FA20 3-Port BCS Installation GuidePDF Document Icon

Product Videos

GrimmSpeed Boost Control Solenoid Install - 2015+ WRX (08:44)
GrimmSpeed introduces the most complete and easy to use 3-Port Electronic Boost Solenoid available on the market for the 2015 WRX. This solenoid will help eliminate the major overboosting issues that most are experiencing with their 2015 WRX by replacing your factory boost control system with a 3-port system. This allows for much tighter and more accurate boost control and will enable tuners to tune your car more effectively and more efficiently. Installation difficulty: 2/10 Installation time: 30-60min Installation tools: 3/8in ratchet, extension, 12mm socket, 1/4in ratchet, extension, 10mm socket, 8mm socket, 10mm wrench, flat head and Philips screwdrivers and pliers. Product: http://www.grimmspeed.com/electronic-boost-control-solenoid-3-port-2015-wrx-2010-2012-lgt-fa20/
  • GrimmSpeed Boo...
    GrimmSpeed introduces the most complete and easy to use 3-Port...

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