What Does The BSC Do?

[Herbal Essences]

Does anyone know what the bsc does when it's connected to 12v? How does it work?

 

[wret]

Do you mean BCS? It closes when energized.

 

[Herbal Essences]

So when 12v is applied the BCS shuts a valve and eliminates all pressure coming out of one of the barbs. Which barb is the input/output?

 

[wret]

Top is in from a branch on the line to the waste gate actuator.
Bottom is out- bled air is released back to the intake.

It takes somewhere around 8 psi to activate the waste gate. The BCS is normally open allowing the boost pressure signal to the waste gate to bleed off. With a removed restrictor, you can get up to about 12 psi in the intake before there is enough pressure in the line to activate the waste gate.

 

[Herbal Essences]

Top is in from a branch on the line to the waste gate actuator.
Bottom is out- bled air is released back to the intake.

It takes somewhere around 8 psi to activate the waste gate. The BCS is normally open allowing the boost pressure signal to the waste gate to bleed off. With a removed restrictor, you can get up to about 12 psi in the intake before there is enough pressure in the line to activate the waste gate.

I have a boost controller. My plan is to run two BCS, one in front of my boost controller and one with opened line to the waste gate. That way I could wire it to a SPDT switch so I switch to high boost and my BCS in front of my boost controller would be open but the straight line for stock boost would be closed.

 

[wret]

A similar idea was explored and documented here:
http://www.dsm.org/archives/1997/11/19971128.txt/10.html

I have a couple concerns with your design. One, the bcs is not intended to function purely as a solendoid valve. It's designed to be restrictive in order to bleed off only a small amount of air. I've not had good luck trying to control boost with small, restrictive solenoids. Boost spikes dangerously high before the waste gate reacts.

Two, your drawing does not have bcs #1 in the proper configuration. Assuming you want it to funtion normally as your base setting, it would continue to bleed pressure even after you switch to your higher setting causing undesirable boost levels. The way you have drawn the waste gate would open at about 8 psi in position 1.

 

[Herbal Essences]

A similar idea was explored and documented here:
http://www.dsm.org/archives/1997/11/19971128.txt/10.html

I have a couple concerns with your design. One, the bcs is not intended to function purely as a solendoid valve. It's designed to be restrictive in order to bleed off only a small amount of air. I've not had good luck trying to control boost with small, restrictive solenoids. Boost spikes dangerously high before the waste gate reacts.

Two, your drawing does not have bcs #1 in the proper configuration. Assuming you want it to funtion normally as your base setting, it would continue to bleed pressure even after you switch to your higher setting causing undesirable boost levels. The way you have drawn the waste gate would open at about 8 psi in position 1.

Cool thanks for your help. I got both my BCS, I already have everything ran electrically I just need to throw on a toggle switch and experiment. That's what I have a boost gauge for. If it works I'll take pictures and post them if not then I'll have an extra BCS to sell