The 4-port design works equally well in low boost applications and high boost. ![]() I suggest not trying to use a stock BCS solenoid in this application as the stock BCS solenoid is a cheap poorly made piece of crap. Full-Race 4 Port MAC Boost Control Solenoid Our 4-port boost control solenoid valve is designed to target a clearly defined boost curve and improve boost responses, and in some cases with a soft WG spring quicker spool. I have had this system installed for years and it has worked flawlessly. It will hold 40 psi when closed and open / close at up to 30 psi. I used a Ford canister purge solenoid from a mid 80s 5.0 (free at the JY). ![]() That way, with switch in reg, I have 9.5 psi max boost, and in the prem position, I have whatever the boost valve is set at. You can either wire the solenoid to a seperate switch, or piggyback a relay on the reg/prem relay to control the solenoid (what I did). When the solenoid is closed, the boost valve controls max boost. ![]() Connect a solenoid to the Ts so when open, it bybasses the boost valve, giving the stock WG boost limit. To keep the high / low boost selectivity with a boost control valve (Gillis, etc) you can do what I did years ago: Put in the boost control valve, and put a vac T at each end of the valve. Later TCs (87-88) just used the BCS as either on or off. ![]() Early TCs dithered the BCS at 40 Hz (Pulse width modulation).
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