Forced Induction Superchargers | Turbochargers | Intercoolers

Still bleeding boost, need help.

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Old May 12, 2009 | 05:40 PM
  #21  
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Originally Posted by WS6HUMMER
Its leaking past the BOV but there is no boost pressure pushing through the vaccum line on top of the BOV piston to hold it closed. I'm gonna run an vac line from my regulated air supply to the top of the BOV and see if it leaks. If it leaks then I have a bad BOV.
Damn. I can't believe that it bled off that much boost and it did it quick. I'm not sure how your BOV is mounted, but is it possible that the oring wasn't seated and it's leaking at the clamp? I know my tial was pretty tricky to get it to stay in place.

BTW your PM box is full
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Old May 12, 2009 | 07:22 PM
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Originally Posted by 98Camarod
Damn. I can't believe that it bled off that much boost and it did it quick. I'm not sure how your BOV is mounted, but is it possible that the oring wasn't seated and it's leaking at the clamp? I know my tial was pretty tricky to get it to stay in place.

BTW your PM box is full
Cleaned out the PM box a little.


My BOV is leaking past the piston inside not where it attaches to the charge pipe. The boost pressure is opening it up, it just has a 1" hose barb connecton. Here's a pic of it when I had it installed wrong. I think the spring is too weak now that I think about it. I can put my mouth on the vaccum port and suck on it and it will open. I dont think any human should be able to do that.


Mine
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Old May 12, 2009 | 07:36 PM
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Originally Posted by WS6HUMMER
Cleaned out the PM box a little.


My BOV is leaking past the piston inside not where it attaches to the charge pipe. The boost pressure is opening it up, it just has a 1" hose barb connecton. Here's a pic of it when I had it installed wrong. I think the spring is too weak now that I think about it. I can put my mouth on the vaccum port and suck on it and it will open. I dont think any human should be able to do that.
lol, have you tried a golf ball through a garden hose?

It makes sense like you said, since it was installed wrong it weakened the spring allowing it to open much easier. But I would think that they would be able to withstand alittle more than that though.

I picked up my tial BOV for 100 bucks from a buddy of mine. If you are looking for a new BOV, I'll see if he has any more.
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Old May 12, 2009 | 07:50 PM
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Where is your vacuum/pressure source for your wastegate referenced from ? Compressor housing or intake manifold?
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Old May 12, 2009 | 08:07 PM
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Originally Posted by Vadian
Where is your vacuum/pressure source for your wastegate referenced from ? Compressor housing or intake manifold?
The lower wastegate port is referenced from a charge pipe about 2 inches away from the compressor housing.
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Old May 12, 2009 | 08:08 PM
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Originally Posted by 98Camarod
lol, have you tried a golf ball through a garden hose?

It makes sense like you said, since it was installed wrong it weakened the spring allowing it to open much easier. But I would think that they would be able to withstand alittle more than that though.

I picked up my tial BOV for 100 bucks from a buddy of mine. If you are looking for a new BOV, I'll see if he has any more.
Thanks, If I have to buy another one I'll def let you check with him. I'm gonna put a little boost to the top of the vaccum port first and see what happens.
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Old May 12, 2009 | 08:11 PM
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Originally Posted by WS6HUMMER
Thanks, If I have to buy another one I'll def let you check with him. I'm gonna put a little boost to the top of the vaccum port first and see what happens.
Alright, I'll give him a call tomorrow. You will have to cut a hole and weld the flange, but I know that's not a problem for you
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Old May 12, 2009 | 08:33 PM
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Originally Posted by 98Camarod
Alright, I'll give him a call tomorrow. You will have to cut a hole and weld the flange, but I know that's not a problem for you

Thanks.
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Old May 13, 2009 | 04:53 AM
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Originally Posted by WS6HUMMER
The lower wastegate port is referenced from a charge pipe about 2 inches away from the compressor housing.
Try referencing it directly from the intake manifold or anywhere after the intercooler.

I was losing boost up top as well. It peaked at almost 9psi and taper off to 6psi. My wastegates were referenced from the ports directly on the compressor housing. I referenced it from the intake manifold and it never tapered off again. From what I understand, as the engine turns faster and moves more and more air, a greater pressure loss occurs after the intercooler.
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Old May 13, 2009 | 07:52 AM
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Originally Posted by Vadian
Try referencing it directly from the intake manifold or anywhere after the intercooler.

I was losing boost up top as well. It peaked at almost 9psi and taper off to 6psi. My wastegates were referenced from the ports directly on the compressor housing. I referenced it from the intake manifold and it never tapered off again. From what I understand, as the engine turns faster and moves more and more air, a greater pressure loss occurs after the intercooler.
That acually makes pretty good sense, do you have a boost controller on your setup?
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Old May 13, 2009 | 10:23 AM
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Originally Posted by WS6HUMMER
That acually makes pretty good sense, do you have a boost controller on your setup?
I thought you already did that, I must have misread then
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Old May 13, 2009 | 10:48 AM
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Originally Posted by WS6HUMMER
Cleaned out the PM box a little.


My BOV is leaking past the piston inside not where it attaches to the charge pipe. The boost pressure is opening it up, it just has a 1" hose barb connecton. Here's a pic of it when I had it installed wrong. I think the spring is too weak now that I think about it. I can put my mouth on the vaccum port and suck on it and it will open. I dont think any human should be able to do that.


Mine

The BOV in that picture looks to be installed wrong ???


Also...if you suspect its leaking, just get rid of the damn thing and test again.
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Old May 13, 2009 | 10:52 AM
  #33  
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Originally Posted by stevieturbo
The BOV in that picture looks to be installed wrong ???


Also...if you suspect its leaking, just get rid of the damn thing and test again.

Yes it is installed wrong in that pic, I fixed it and I'm still having the same problem. A friend suggested capping it off also but is that safe on a stick car?
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Old May 13, 2009 | 11:04 AM
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There were turbocharged cars for years, before BOV's were introduced. There are some turbos that can be very fragile....but most wil be perfectly fine. Especially if you are running such low boost pressures.
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Old May 13, 2009 | 11:06 AM
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Originally Posted by stevieturbo
There were turbocharged cars for years, before BOV's were introduced. There are some turbos that can be very fragile....but most wil be perfectly fine. Especially if you are running such low boost pressures.
OK thanks.
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Old May 13, 2009 | 11:22 AM
  #36  
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i wouldn't just cap it off. no matter how much boost you run it has to go somewhere and the easiest way is back through the turbo. which in turns stops the compressor wheel for a mila-second, reducing the life expectancy. it'll sound like a dodge diesel, the compressor surge.

oh i'd get a tial bov anyway, hands down the shizznit
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Old May 13, 2009 | 11:29 AM
  #37  
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Originally Posted by brock's T/A
i wouldn't just cap it off. no matter how much boost you run it has to go somewhere and the easiest way is back through the turbo. which in turns stops the compressor wheel for a mila-second, reducing the life expectancy. it'll sound like a dodge diesel, the compressor surge.

oh i'd get a tial bov anyway, hands down the shizznit
Thanks.
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Old May 13, 2009 | 12:22 PM
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Having driven and owned plenty of turbocharged cars over the years...some with, some without BOV's....it will do no harm.

And it will allow you to eliminate the BOV from the list of possible problems.
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Old May 13, 2009 | 12:50 PM
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yeah i'm just saying i wouldn't run it like that for long. i'd just buy a tial 50mm and call it a day
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Old May 13, 2009 | 04:50 PM
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Originally Posted by WS6HUMMER
That acually makes pretty good sense, do you have a boost controller on your setup?
Nope, no boost controller.
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