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Old 06-08-2014, 02:59 AM   #1
Scooby Newbie
Member#: 391067
Join Date: May 2014
Default Different ways of connecting 3 port BCS

Hi guys, I've come across 2 different guides for the installation of a 3 port BCS to replace the FBCS.

I have a spare AEM BCS lying around and I noticed that the installation guide states this:

While the Cobb guide (http://www.cobbtuning.com/Technical-...es-s/70674.htm) says to do this instead:

AFAIK, the solenoids are the same, so why the difference? The AEM installation instructions might be for use with the AEM Boost Controller (vs ECU control for the Cobb guide). Could that be the reason? Thanks.
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sabe is offline   Reply With Quote
Old 06-08-2014, 10:11 AM   #2
Scooby Newbie
Member#: 383633
Join Date: Mar 2014
Chapter/Region: RMIC
Location: Yampa, CO
2002 Impreza WRX


Your just causing a leak if you hook it up the first way.

Its a small leak but whatever air it took to fill the vacuum line and the diaphragm is escaping every time your ECBS cycles.

IMO your much better if you do it cobbs way. Use large 3/16" tubing on the side that goes back to the intake. Then use the 1/8" on the turbo and actuator.
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Old 06-08-2014, 02:02 PM   #3
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Member#: 296705
Join Date: Oct 2011
Chapter/Region: NWIC
Location: Wa
05 STI



All you need to know. And simple to understand

O i see you already read it. But yea i did the cobb way. Also if you are running ewg i would run 1/4 supply.
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Old 06-08-2014, 05:29 PM   #4
Scooby Specialist
Member#: 232940
Join Date: Dec 2009
Location: cold

A lot of people who are installing an AEM solenoid (with say an AEM Tru Boost external controller) have say a Honda with a turbo conversion. So in that situation your intake is probably just a solid aluminum pipe with no barb to attach a recirculation line, plus speed density engine controls. So the leak doesn't matter a whole lot.
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Old 06-09-2014, 04:00 AM   #5
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Member#: 391067
Join Date: May 2014

Got it. So the sintered muffler (whatever that is) is used to release some boost to delay wastegate opening. For MAF sensors vehicle this leads to some loss of metered air hence it should be piped back into the intake post-MAF instead.
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