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DIY - Dual BOV Low Cost Setup
Published by lE92l
11-22-2011
DIY - Dual BOV Low Cost Setup

So I ordered some parts to experiment a dual BOV setup using the stock chargepipe. I buddy of mine 1ForAll has a similar setup with some early Turbosmart prototypes. I am actually very happy with the results ill give the instructions and give more feedback further down.

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Update Videos: Note the outside video its an ER Chargepipe instead of stock however its the same thing.

Inside


Outside


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Update Video: Thanks to E90 ME


Quote:
Originally Posted by E90 ME View Post
Here is a video i made.

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Update Video One Greddy and One HKS: Thanks to NewMember
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Quote:
Originally Posted by NewMember View Post
A bit ricey but I like it.
One hks bov ( took a bit of custom work to make it fit, the c clip needed to be grinded a bit to fit.)
One greddy bov




The sound is a bit exaggerated since its in a tunnel, with windows up, you barley hear it. Windows down and flooring it, sounds like video.
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Update Cheaper Adapters: Thanks to Ridehard335

Quote:
Originally Posted by Ridehard335 View Post
I used these adapters instead

[http://www.ebay.com/itm/GReddy-BOV-M...c62eff871#ht_2

I was able to get the pair for $31.90 shipped. They work great at less than 1/2 the price.
The whole setup was under $100 with the plugs and clamps.
$19.99
http://www.ebay.com/itm/GReddy-BOV-M...c62eff871#ht_2
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1. I bought these adapters ($39 each) they have Greddy, TIAL, and HKS BOV type adapters for stock chargepipes. These are specifically made for our 335i N54 Charpepipes so they lock and fit just like stock diverter valves.

Greddy - http://www.atpturbo.com/mm5/merchant...Category_Code=

Tial - http://www.atpturbo.com/mm5/merchant...Category_Code=

HKS - http://www.atpturbo.com/mm5/merchant...Category_Code=



I bought the Greddy type adapters like the image above.

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Update:

Updated the BOV these seem to be better the original ones I used worked great when I first put them in but after taking them off and putting them back started getting a little squeal(almost like a brake squeal) after the wooshes. Swapped them out for these never had an issue and they have been taken off and back and off again no issues. I left them at the spring rate they came with but you can adjust them with the screw on top of them.
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2. I bought some $30 Greddy Type BOVs from eBay specifically these:

eBay BOVs

Honestly very surprised on the quality of the build of these BOVs they dont feel cheap whatsoever pretty heavy as well.





3. Once I received both sets of items I put them together very straight forward.

4. Remove the stock diverter valves and plug the intake holes. What I used is the rubber caps that are put on the bottom of chair legs 7/8 size the 1' should work as well. I got a set of 4 at Lowes. They are pretty tight put I also bought small clamps from pep boys. Here is what it looks like.



5. Its almost too easy but just slide the BOV with the adapter attached into stock chargepipe and lock in place, you can position the BOV in 4 ways I decided to point them down. Connect the two hoses from the back of the BOVs to the stock hose originally connected to the stock diverter valves and your good to go. Here is the final pic of the setup:

This is a pic to show where they slide into you dont have to remove charpepipe or anything like that.





So things you will notice you will have two woosh sounds one right after the other which at first it was different but I actually like it now.

Question that might come up does it sound too ricey you got two BOV for crying out loud?

- Actually just cruising unless you have the windows down and radio off you wont really notice them. Its not an annoying sound that will make you feel like your driving a ricer.

- However when you are stepping on it and let go of throttle you will notice it and thats all I was going for you can adjust the BOVs sensitivity with screws and nut on top of them. I actually had to loosen the rate some.

Any noticeable performance gain or loss any limp mode or boost leaks?

Car runs as strong as always obviously this will not improve performance at least not any noticeable difference. I took the car to the track at FixxFest ran 13.1 which is what I expected in 90 degree weather and after 3 hour drive (JB4 Map 5, BMW DCI, Muffler Delete). No limp mode or boost leak that I can tell and bcz car is running as before that's what I'm basing on the no boost leak.

This is a cheap mod if you drive a BMW you should buy a $600 BOV if not go buy a Honda?!?

I say to each his own if you don't like it and want to criticize it go right ahead wont bother me none. You buy what you want to buy for your car, I buy what I want I'll drop some money on somethings but not BOVs personal preference.
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  #1  
By rexsevn on 11-24-2011, 02:41 PM
The adapters you mentioned above fit directly into the stock chargepipe?
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  #2  
By lE92l on 11-24-2011, 05:57 PM
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Quote:
Originally Posted by rexsevn View Post
The adapters you mentioned above fit directly into the stock chargepipe?
Yeah they slide right into stock chargepipe same size as stock dv valves. Install literally took me 15 minutes fits perfectly.
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  #3  
By babymilo88 on 12-07-2011, 04:12 AM
nice write up, looking forward to hear some sound clip for dual BOV
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  #4  
By Yodaime on 12-09-2011, 10:30 AM
Effing smart. GOOD DEAL!
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  #5  
By nitehawk on 12-09-2011, 01:25 PM
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Nice find! I'd love to see some installed pictures!
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  #6  
By blk08e92 on 12-11-2011, 01:18 PM
got any more pics or video of the sound this makes? just wanna make sure i know where everything goes thats all! its kinda hard to tell from the pics or either its stupid easy!! Thanks!
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  #7  
By blk08e92 on 12-11-2011, 06:49 PM
any pics of the holes you put these into before the BOV was installed? does the stock pipe have holes to insert these??
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  #8  
By lE92l on 12-13-2011, 03:08 PM
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Quote:
Originally Posted by blk08e92 View Post
got any more pics or video of the sound this makes? just wanna make sure i know where everything goes thats all! its kinda hard to tell from the pics or either its stupid easy!! Thanks!
Quote:
Originally Posted by blk08e92
any pics of the holes you put these into before the BOV was installed? does the stock pipe have holes to insert these??
Its really easy the adapters are made specifically for our diverter valve holes. The hardest part is removing the stock diverter valves. The adapter is exact replica of the nozzle on the stock diverter valve. The grey clip thing you turn to get the diverter valve off is part of the chargepipe not the diverter valve had that misconception as well. You'll see the stock diverter valve has a nozzle that slides into the hole of the chargepipe the adapters slide into the same hole and lock just like the stock diverter valves.

Here is a pic of a stock charpepipe see the two holes the adapters slide into there and locks super easy took 3 minutes to install.



I ended up upgrading the chagepipe since the stock before this one had cracked at the track didnt want same thing to happen to this one. I gave the setup to my friend ill try to get some vids of the sound.
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  #9  
By cole92 on 12-13-2011, 03:33 PM
Have you logged AFRs between shifts yet?

Someone correct me if I am wrong, but air on the 335 is metered after the maf not before it, hence will run rich with VTA between shifts.
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  #10  
By rexsevn on 12-13-2011, 06:59 PM
335 Doesn't have a MAF sensor.
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  #11  
By blk08e92 on 12-13-2011, 08:32 PM
do you have to do 2 BOV or can you only do one???
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  #12  
By red2007 on 12-14-2011, 07:51 PM
Post a video up when you can. I'd love to hear it in action.
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  #13  
By nitehawk on 12-15-2011, 08:38 PM
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+1. Does it make make a high pitched squeal like the HKS or a rattle snake "pffft" as the Tial? :P
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  #14  
By lE92l on 12-18-2011, 05:04 PM
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Quote:
Originally Posted by cole92 View Post
Have you logged AFRs between shifts yet?

Someone correct me if I am wrong, but air on the 335 is metered after the maf not before it, hence will run rich with VTA between shifts.
I dont do any logging but from the boost gauge on oil I had been boosting the same as before. My friend that has them now has Cobb and is boosting 18 pounds of boost with no problems.
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  #15  
By lE92l on 12-18-2011, 05:06 PM
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Quote:
Originally Posted by blk08e92 View Post
do you have to do 2 BOV or can you only do one???
You can run just one I did for couple days then ended up putting both what I did is left one stock diverter valve and one bov. Didnt see any issues just had the second one sitting there went ahead and put both.
Last edited by lE92l; 12-18-2011 at 09:41 PM.
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  #16  
By lE92l on 12-18-2011, 05:07 PM
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Quote:
Originally Posted by nitehawk View Post
+1. Does it make make a high pitched squeal like the HKS or a rattle snake "pffft" as the Tial? :P
This not an actual video of them but it sounds exactly like this video. Same loudness and same pfft sound.Next time I hang out with my friend I'll make an actual video of the setup.

Last edited by lE92l; 12-18-2011 at 05:21 PM.
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  #17  
By nitehawk on 12-18-2011, 06:54 PM
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Thanks OP. I also found the following plug kit on the adapter site you listed, although pricier:

http://www.atpturbo.com/mm5/merchant...ry_Code=BMW335
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  #18  
By Ridehard335 on 12-21-2011, 11:18 AM
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Great post! what are the advantages of having 2 BOV. Would like hear the difference between single or double bov.
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  #19  
By E90 ME on 12-24-2011, 10:50 PM
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Does it sound similar to this? (not my car BTW)
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  #20  
By lE92l on 12-25-2011, 04:18 PM
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Quote:
Originally Posted by Ridehard335 View Post
Great post! what are the advantages of having 2 BOV. Would like hear the difference between single or double bov.
No real advantage I think just sense the stock chargepipe has two outlets and the outlets diameter is smaller that a traditional bov flange I would think you need both to release boost correctly. However I'm totally guessing you might be fine with just one.
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  #21  
By lE92l on 12-25-2011, 04:24 PM
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Originally Posted by E90 ME View Post
Does it sound similar to this? (not my car BTW)
Actually no when the car is not moving it's one loud whoosh. In low rpms you'll notice a small separation in the whooshes but alot quicker than the video. In high boost/rpms it's one loud whoosh. I really have to make a video having gave the setup to my friend it's harder to make. I'll have to try to have one up by next week.
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