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.
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
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