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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Tial BOV Questions



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      11-25-2014, 10:22 PM   #1
ferocity02
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Tial BOV Questions

I just installed a VRSF chargepipe with a Tial Q BOV with an 11psi spring as recommended. I usedthe stock vacuum line from the intake, with an adapter to step up to 1/4", then 1/4" line to the BOV. It seems like there is a delay in the opening of the BOV. And sometimes I will get turbo flutter.

I am thinking the stock vacuum line is causing too much of a restriction. Has anyone upped the vacuum size to all 1/4"? I am wondering how to do this with stock nipple on the manifold. Or maybe I need another source for the 1/4" line.

Also, I am thinking the spring might be too stiff. 11psi seems to be the go-to spring, but I've seen a few people go down to a 10psi spring.
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      11-25-2014, 11:02 PM   #2
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I also get a small amount of flutter at low rpm/boost, when immediately letting off the pedal. Be careful if you pull the vacuum line off the manifold that you don't break the small, flimsy, plastic vacuum nipple attached to it.

I used the new vacuum hose the ER pipe came with. Mine seemed to kind of "break in", if you will, and it opens much smoother now. Start by installing new vacuum line directly from the top of the BOV, to the manifold. And check that the top elbow on top of the BOV is in the correct position with the opening inside.

Last edited by 335NJ; 11-26-2014 at 12:55 AM.
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      11-26-2014, 09:45 AM   #3
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Get rid of those vacuum line adapters and replace entire line with 3.5mm silicone line. These silicone lines stretch nicely over the Tial BOV and also fit OEM factory nipple.
http://www.verociousmotorsports.com/...ld-by-the-Foot
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      11-26-2014, 10:57 AM   #4
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Agree with blaster.installed mine on day 1 and never had any issues at all.bov actually got louder over time due to it being used,but other than that nice and stealth
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      11-26-2014, 12:45 PM   #5
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Quote:
Originally Posted by Blaster400 View Post
Get rid of those vacuum line adapters and replace entire line with 3.5mm silicone line. These silicone lines stretch nicely over the Tial BOV and also fit OEM factory nipple.
http://www.verociousmotorsports.com/...ld-by-the-Foot
What is the ID of the nipple on the intake manifold?

3.5mm is just over 1/8", which I beleive is the size of the factory line. So there would be no benefit of replacing the factory line->adapter->1/4" line that I currently have with an all 3.5mm line.

What would be best is a 1/4" line that runs the entire way from the intake to the BOV. But I don't know where I could tap into. Maybe I would need to drill and install another nipple.
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      11-26-2014, 01:30 PM   #6
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Quote:
Originally Posted by ferocity02 View Post
What is the ID of the nipple on the intake manifold?

3.5mm is just over 1/8", which I beleive is the size of the factory line. So there would be no benefit of replacing the factory line->adapter->1/4" line that I currently have with an all 3.5mm line.

What would be best is a 1/4" line that runs the entire way from the intake to the BOV. But I don't know where I could tap into. Maybe I would need to drill and install another nipple.
The silicone line eliminates the restrictive adapters. You could possibly go 4mm for a slightly larger line if you wanted to. Or you could always do this but I think it is overkill myself: http://www.e90post.com/forums/showth...light=Tial+BOV

Here is my 3.5mm vacuum line which stretches nicely over both BOV and stock vacuum nipple.
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