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Forge BOV Issues

7K views 31 replies 10 participants last post by  Red Raspberry 
#1 · (Edited)
Got a Forge BOV from someone and it is the variety that only has one crescent (not the one with three of them). Installation went smooth however I'm having some unusual issues with the BOV being open/closed.

The BOV (according to research) is supposed to be CLOSED during idle.

Mine is the complete opposite, my BOV is OPEN at idle (which isn't normal) and CLOSES after turning off the car (which is normal).

I'm running the BOV off the manifold bypassing the solenoid in a fashion like this: Screenshot by Lightshot

That is B-Spec's engine bay because he's been helping me with the install, mine is exactly the same except for the fact that my vacuum line that is going into my boost gauge is slightly longer (in the photo we tap into the manifold and then place another tee in the middle that goes to the boost gauge.

In regards to how it runs on the car: it releases pressure about a half second after letting off the throttle, which sort of makes sense since the solenoid is no longer controlling the boost. The boost is far more consistent, the car feels faster and more "grounded" (if you will) with its boost delivery.

Any ideas?

Things I've done: check all springs, tried yellow spring with different shims, took apart the BOV and lubed with white lithium grease. Check all o-rings prior to install and they were good.

Additionally Forge's website says being open at idle is normal, but that is sort of scary considering it is sucking in dirt and debris as B-Spec pointed out to me.

Here are some pictures of the entire set up for anyone that needs it for a visual reference:

1.) http://prntscr.com/5s5m9b

2.) http://prntscr.com/5s5nbt

3.) http://prntscr.com/5s5o2m

4.) http://prntscr.com/5s5ovu

Forge BOV > vacuum line > T-Fitting the expands to the boost gauge sensor > after the T-Fitting it continues into the manifold where I used another T-Fitting to tap into the manifold.
 
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#12 ·
if y remember correctly this will happen only if connected directly to the intake

to open the bov you need around 5 psi of differential pressure

so when connected directly to intake you have the piping at around 0 psi and intake a -9 psi so enough to open

when connected to stock solenoid at idle the bov is connected to turbo
so differential pressure is 0 and then stay close...it connect to intake only when pcm deem'it necessary to open
 
#13 ·
Interesting, B-Spec's set up is like mine any idea why his is closed?
 
#25 ·
Pretty sure I remember B-Spec using the blue spring. A friend of mine was running his Synapse BOV directly from the intake manifold and it was open at idle. He then switched it to the solenoid and it was closed at idle. I run my Synapse from the intake manifold and it's open at idle as well. I've had it like that for tens of thousands of kms with no issues at all. When I had it plumbed to the solenoid, the actuation wasn't nearly as quick...in fact, under heavy throttle it would blow off out of the intake first and then out of the BOV on the cold side.
 
#29 ·
Do you have yours hooked up to the solenoid?
 
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