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Big red stuck open?

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Old Apr 11, 2014 | 02:02 PM
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Default Big red stuck open?
Anyone know a good way to test this? I dont have a boost gauge but on my datalogs it doesnt appear to be making any boost. Tuner says he thinks the bypass is stuck open? Ive checked the piping/couplers, I used Tbolt clamps so I ruled that out right away. This is on a D1SC car
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Old Apr 11, 2014 | 02:06 PM
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Can you visually see it? It should be closed with the motor off. So have some one look at it, then start the car and see if it opens. Revving the motor should cause it to momentarily close, then reopen.
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Old Apr 11, 2014 | 02:26 PM
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Yeah its in a easy to see spot. Im at work so I couldnt rev it that high but. It was closed when I checked before starting. Opened when on and stayed open when I shut the car off? Ill rev it later to check.
Last edited by 01SOMm6; Apr 11, 2014 at 02:33 PM.
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Old Apr 11, 2014 | 02:48 PM
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Unhook the vacuum source to it and it should stay closed. Make a pull with it like this and see if it makes boost.
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Old Apr 12, 2014 | 07:43 AM
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Originally Posted by Cam72aro
Unhook the vacuum source to it and it should stay closed. Make a pull with it like this and see if it makes boost.

Just be cautious doing this, because there will be no release for any boost once you close the throttle, so keep that in mind. Small incremental rpm pulls would be advised and not a wot to redline pull.
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Old Apr 12, 2014 | 08:13 AM
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check for a pinched hose.
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Old Apr 12, 2014 | 08:56 AM
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Originally Posted by The Alchemist
Just be cautious doing this, because there will be no release for any boost once you close the throttle, so keep that in mind. Small incremental rpm pulls would be advised and not a wot to redline pull.
A couple of small pulls won't hurt anything.
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Old Apr 12, 2014 | 08:59 AM
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You can also hook up a vacuum gauge to it to see if it is opening and closing. Bob
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Old Apr 12, 2014 | 11:05 PM
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Where is the source of vacuum/boost for the BOV? Sounds like to me it may possibly be sourced behind some kind of check valve that is holding a vacuum and the BOV never sees the boost? The check bleeds off while the car sets, as soon as it cranks and gets vacuum back on it, it stays open while the car is running.

I dunno, just throwing that out there...
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