The SpeedFactory Racing 4-Port Boost Control Solenoid Kit allows precise boost control with PWM (pulsewidth modulation) signal from a source (ECM or Electronic Boost Controller). Can be used with single or multiple wastegates, for use with external wastegates only.
25Hz is our suggested starting point for control frequency in your EMS, and gives stable control in MOST setups. 4 port solenoids are more sensitive than 3 port solenoids. Improper control frequency will result in unstable boost control!