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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > 335i Free BOV DIY



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  335i Free BOV DIY
Red Star Rising
04-06-2007
Since Active Autowerke insists that their BOV is worth $750, I think this little DIY is great. Not extremely loud. But noticible, and nice. Member JOEVISTA clued me in on exactly how to do it. Thanks!
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  #44  
By Red Star Rising on 04-07-2007, 03:34 PM
Rev it hard to 5K and release the throttle quick. you should be able to hear it.
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  #45  
By boostedtwin on 04-07-2007, 04:16 PM
Can you do a DIY? I wanted to try but would help with the pics of the procedure. If you can get any sound clip too would be nice.
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  #46  
By Red Star Rising on 04-07-2007, 04:21 PM
^^ Page 1.
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  #47  
By BMW_E90 on 04-07-2007, 04:22 PM
thats ghetto LOL!
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  #48  
By M3to335 on 04-07-2007, 04:23 PM
I just ripped it all back off. If you really must.....

Follow the first few minutes of Shivs install for the PROcede uptill the bulkhead plastic piece is off. Once you get there, you can easily access the rear area to plug. Its this...

Trust me, use the cap off a quart of oil when you plug it. Run a lot of tape around the area to plug. Then screw on the cap. It will literally make its own threads and create an air-tight fit.

I didnt really notice much if any sound though.
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  #49  
By Red Star Rising on 04-07-2007, 04:24 PM
Quote:
Originally Posted by BMW_E90 View Post
thats ghetto LOL!
Maybe, but it works. If you can get some nice looking bung caps that seal perfectly by themselves, it wouldn't looks so ghetto.
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  #50  
By Red Star Rising on 04-07-2007, 04:25 PM
Im gonna try and get a video up now to show you what I can hear.
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  #51  
By BoostedBMW on 04-07-2007, 04:33 PM
I know that my BOV wouldn't sound at all when I was revving it in neutral, too boost I had to load the engine. Did you try driving it around at all?
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  #52  
By boostedtwin on 04-07-2007, 04:34 PM
Do it, thanks.
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  #53  
By M3to335 on 04-07-2007, 04:35 PM
No sir. Good point, oh well , its off already. It wasnt exactly hard to do
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  #54  
By teknochild on 04-07-2007, 04:40 PM
Quote:
Originally Posted by BoostedBMW View Post
I know that my BOV wouldn't sound at all when I was revving it in neutral, too boost I had to load the engine. Did you try driving it around at all?
u have a manual dont u
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  #55  
By M3to335 on 04-07-2007, 05:05 PM
Yeah Ive got a manual. It certainly was blowing an assload of air out of those pipes though.

Think I will have different results if I put it back together and take her for a spirited ride
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  #56  
By BoostedBMW on 04-07-2007, 05:09 PM
Quote:
Originally Posted by teknochild View Post
u have a manual dont u
I'm not sure if you were talking to me or him, but yes I have a manual.
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  #57  
By Red Star Rising on 04-07-2007, 05:12 PM
Waiting for youtube to put my vid up......

My camera does not capture the sound as well as it sounds in reality, but you can definetly hear it in the vid.
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  #58  
By skim7x on 04-07-2007, 05:55 PM
Quote:
Originally Posted by ///Matt View Post
The Diverter valves are calibrated to open when there is a specific pressure difference (I beleive .3 bar) between the out let side (which you disconnected) and the manifold pressure side (the small vacuum hose attached to the other end of the diverter.
Yeah... thats what I was refering to in my first post (I just don't know enough to say it as well as ///Matt did)... I think he's right guys... but hey, nice mod and let me know if your 335i is still doin good this time next year (not being speculative--just wondering... maybe i'll do it next year if your car lasts ;-))
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  #59  
By ///Matt on 04-07-2007, 06:00 PM
Quote:
Originally Posted by Red Star Rising View Post
///Matt... It really shouldent matter as the valve is working the way it was before, except that its not plugged back into the intake...it just vents to the atmosphere.
If you say so. What do I know?
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  #60  
By Red Star Rising on 04-07-2007, 06:07 PM
Vid...not the greatest audio pickup, but here it is....

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  #61  
By RiXst3r on 04-07-2007, 06:10 PM
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  #62  
By teknochild on 04-07-2007, 06:59 PM
Quote:
Originally Posted by BoostedBMW View Post
I'm not sure if you were talking to me or him, but yes I have a manual.
you, i dont know why he thought i was talking to him, but it applies to both of you, the turbos wont spool as much for a manual as they do an auto when revving in neutral, therefore less blow off
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  #63  
By BoostedBMW on 04-07-2007, 07:58 PM
The free bov sounds Tial-ish.
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  #64  
By boostedtwin on 04-07-2007, 08:05 PM
Sounds good for free...
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  #65  
By TiAg335i on 04-07-2007, 09:07 PM
Sounds very stock, which is good.
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