MAC Boost Control Solenoid (4 PORT)
MAC pneumatic dual pole solenoid valve for boost or vacuum control.
The 4 port valve can be used to control a wide boost range, enabling high boost levels without the need for a powerful wastegate spring.
Achieving precise boost control with the 4 port valve can be more difficult and the solenoid control (duty cycle) will be different to a common 3 port valve system.
A 4 port boost solenoid should not be used to directly replace a 3 port boost solenoid without re-calibrating the boost control settings.
A: Top wastegate
B: Bottom wastegate