Quote Originally Posted by vdubkilla View Post
Pretty much exactly so it will open and dump exhaust once it reaches the springs psi /pressure rating and it is also the least amount of boost you will be able to run unless you get a 4 port I think with a 4 port boost solenoid you can cut the boost level in half to say 5 psi .I don't have one as of yet but am looking into them so I can run less boost in 1st and second and not have to back pedal so often .I run a twin scroll set up with 2 gates both have 7 psi springs in them and I love having twin gates as it doesn't creep at all up top and it spools insanely fast down low .
You are right, kinda. The spring pressure is the LOWEST boost you can run, no questions asked. A 4 port solenoid, or any solenoid/boost controller can never cause boost to be less than the spring pressure, it can only raise it. The nice thing about the 4 port, is that it can raise it a LOT above spring pressure. Generally a 3 port is good for like 2.5x spring pressure, so a 3 psi spring will top out at (on the high side) 10-12 psi, whereas the 4 port can make probably over 30 psi with that 3 psi spring.