4 Port Mac Boost Control Solenoid (FR-UNI-4PORT-BCSV)

The Full-Race 4-Port MAC Boost Control Solenoid Valve is designed to precisely manage boost pressure, delivering a clearly defined boost curve and improved response. Unlike a traditional 3-port solenoid, the 4-port design is highly effective in both low boost and high boost applications because it precisely directs pressure to both the open and close ports of your wastegate diaphragm. This functionality allows for a much lighter wastegate spring pressure, enabling better low-gear boost control for increased traction at launch, and perfect high-gear, high-boost control. This capability is commonly referred to as "boost by gear."

Features

• Delivers better spool-up time and increased mid-range power.
• Provides superior duty cycle control to accurately hit and hold target boost levels.
• Normally closed design ensures the system defaults to wastegate spring pressure upon failure, preventing over-boosting.
• Uses 1/8-inch NPT fittings.

Notes

• If upgrading from a 3-port solenoid, the boost control tables will require re-tuning.
• 4-port solenoids require smaller duty cycle changes; PID tables should be dialed down (single-digit numbers) to prevent over-reaction.
• For B2 EFR frames, the solenoid must be mounted upside down to correctly orient the exhaust port toward the wastegate nipple.

Compatibility Notes

• Ideal for sealed dual port internal wastegate applications, both internal and external.
• Compatible with Hondata S300, K-Pro, and Flashpro.
• Supports all Pulse Width Modulation (PWM) modulated standalone and piggyback ECUs.

Specs

• Type: 4-Port Boost Control Solenoid Valve (BCSV)
• MAC Part Number: 46A-AA1-JDBA-1BA
• Port Size: 1/8 inch NPT