Granted - coming from me, this is a stupid question so I guess I am looking for a little validation to my thinking - just so I know I'm not completely crazy.

I added the Injen hardpiping/intake on my IX which (like most intakes) changed the location of the BOV. Granted the IX BOV is the nice aluminum piece from the GSR so I thought it was more stout than the plastic VIII BOV.

Anway, I installed the BOV side-down, meaning the piston wasnt facing the intake charge, it was on the pre-compressor side and the side of the BOV was in the intake pipe to the TB. Which is opposite of the factory position.

With the open airfilter on the intake I could really hear the BOV pop - BUT it would flutter at part throttle. Quite bad actually.


So I switched it back to the factory position. And now its SUPER QUIET. It makes no noise - zero.
Does this make any sense? What gives - I've doubled checked the install and it's textbook. Would the BOV make no noise in one position and ALOT in another - but its still pretty much operating in the same manner?

HELP!

 

Well, backwards is bad, so it would likely make strange noises. In its proper orientation, it has no reason to make noise other than the fact you have an intake. What are you expecting to hear from a stock recirc valve? I have yet to hear either my JDM MR DV or my Forge RS, but I have the stock intake.

 

Removing the stock airbox makes a huge difference in sound.
Long time ago - I spoke to Mike @ Forge and you can run the Forge BOV in either position - sideways or proper.

But on the IX and with the open intake and BOV sideways - I could really hear the whooosh, just like with the Forge on my VIII. But when I switched it to proper, its quiet. Which doesnt make sense since I should be able to hear it pop open.

 

Anyone? Someone has to know

 

i ran my bov backward and regular. no real difference . u are going to want to run it regular that way u dont have the vacume pressure opening the valve alone.

ps. backwards was louder

 

Exactly! How come backwards is louder?

The idle dips momentarily when the valve is in backwards and it flutters at part throttle. But I can hear it pop open when off throttle. When the vavle is in regular - its super quiet, doesnt flutter and the idle is smooth. I just dont think its opening b/c I cant hear it. But I guess it's ok.

 

it's louder when it's backwards because it's allowing more pressure buildup prior to opening (which is really, really bad for the turbo). When installed properly, you have vacuum from the intake manifold on one side of the diaphragm in the BOV forcing it open, and pressurized air from the turbo pushing up against the piston of the BOV forcing it open. The two combined combined forces make the BOV open at the righ time. If you put it in backwards, there is no turbo pressure pushing up against the piston to open the BOV, only the vacuum reference from the intake manifold to the top of the diaphragm of the BOV. You only have one force acting to open the BOV instead of two, and the BOV will allow more pressure buildup coming off the turbo before it opens. It's very bad for the turbo, but it will be louder once it finally does open.

 

AH, well done.

Now it makes complete sense why it's louder. And also that I should switch it back to the original position.

THANKS!

 

Hey, I'm bringing this thread back alive - because I have smiliar problems with my bov. I've repalced my stock intake pipe with the BR intake pipe. For some reasons, the most convienent way to place my bov is to mount it right underneith of my stock UICP. Now, with that setup, 2 things are different from the original set up:
1) Having the BOV (top side) facing downward instead of facing toward the Turbo
2) It runs a longer hose btw the BOV to Intake Pipe, and a shorter hose btw the BOV and the UICP

The very same problem, it seems like I don't hear the "whoosh" sounds or it has become pretty quiet! I can't hear a thing until I really boost it up, but then again it isn't as loud as before. So, I'm wondering if it has something to do with my BOV orientation or the BOV itself? Also, I could hear the "whoosh", louder and clear, at the first test driving after I took everything apart and put them back together. Am I having a leak problem? Anyone with such experience can provide a little tips, and I'd highly appreciate anyone's input

Another thing would help, when the BOV doesn't work appropriately, let's say it doesn't open when it should, would it affect the boosting power? Like, Overboot or Underboost?? I suspect my power has dropped from before but I'm not really sure if this is related to the BOV? Please help

Thanks

 

Any rubber you put between the BOV and the intake pipe will reduce the sound volume of the ricey whoosh you're talking about. Make sure you have it installed in the correct orientation, otherwise it'll leak/make bad noises like the OP.

ps:

 

That's exactly what my question is : Does a BOV orientation matter? If so, what is the correct orientation for the setup (ie having the BOV Top facing which way )

Now, let's say that my BOV is not working correctly, what happens when it:
1) Stays open all the time - Over or Under Boosting? Power loss significantly??
2) Never open at all - Over or Under Boosting? Power loss significantly??

The way I have my BOV setup on my stock UICP should exactly opposite from the way you would do with an ETS UICP, whereas ETS UICP setup would have the BOV mounted right above the pipe, having the BOV Top facing upward. So, would that also be an incorrect orientation since the stock setup should have the BOV Top facing side way toward the Turbo

Any of Your Input

 

Backwards will hold boost as good as any aftermarket valve.

 

What exactly does "backward" here? Reversing the BOV upside down? Reversing the BOV sideway (having the BOV top facing away from the turbo instead of toward the turbo?) Or, even reversing the BOV unit itself by hooking the port that used to go to UICP now to Intake, and the same with the other port

It'd be helpful if someone can post a pic of the bov in the "backward" setup

 

bump for pics of backwards vs. regular

 

When you install it backwards, you're putting boost pressure on the back side of the valve, which is forcing it closed against the valve seat. GREAT for keep it sealed under boost, HORRIBLE for actually letting it do it's job and venting pressure when you lift the throttle. To correctly hold boost if you're at the point where the stock valve leaks, either perform the leak-stop mod by plugging the fast relief port or look into an aftermarket valve.