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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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  #176  
By zke36 on 09-23-2009, 05:07 PM
not that im a tech, but from what i understand when the Diverter re-routes the air into the intake for the fraction of a second that it does, all that it accomplishes is relieves some of the vacuum pressure the engine is putting on the intake for that fraction of a second. Then the engine goes back to working as hard as it has been through the rev range to intake air.

So, correct me if im wrong, but by re-routing to atmosphere all we are doing here is not giving the engine/intake a little boost/break from vacuum pressure for a fraction of a second. I doubt this greatly hinders performance on a 300hp TT car.

So its noise vs. a very small fraction of a second faster (if anything)
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  #177  
By AWMSPORT on 09-26-2009, 02:12 PM
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Great Wrightup

Ive had this mod done for about a year now, and even at low RPM's you can hear them spool up and blow off- , one of my Favorite/ Cheapest Mods!!
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  #178  
By pc4400 on 11-09-2009, 04:43 PM
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I'm no expert but I do have a comment on this;

I came from a subaru so Im familiar with BOV's, more importantly the need not to use them. BOV's really are pointless unless you're swapping out for larger turbos.
But more importantly, the were issues with cars (subarus) with BOVs (atmospheric, not recirculating) cause the car to run rich momentarily slightly hindering performance. No known aftermarket remapping ever solved this problem. Most of the kids that put these units on didn't really care about the performance just sound. I couldn't imagine doing this to this car (335i). With so many fancy sensors and an iffy HPFP, why risk it?

Just thought I could give a little comment based on what I've learned.
Thanks
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  #179  
By Philritter21 on 11-19-2009, 11:32 PM
Ok, I can say that after several months of running my car like this, there were no apparent ill mechanical effects, BUT it sprays oil all over the engine compartment. It makes a mess.
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  #180  
By jaxxx on 11-20-2009, 08:42 AM
nice
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  #181  
By bimmertt on 12-30-2009, 10:02 PM
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Quote:
Originally Posted by Philritter21 View Post
Ok, I can say that after several months of running my car like this, there were no apparent ill mechanical effects, BUT it sprays oil all over the engine compartment. It makes a mess.
is this true of all BOVs or just if you use the stock dvs?
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  #182  
By craesq on 01-30-2010, 09:34 PM
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Lots of talk on this by people who are really just guessing. BMW bypass vales recirculate into intake tract for one main reason: so there is no blow off noise.

Pulling off the hose and plugging the intake gives you the noise BMW and other car makers engineer out. There is no significant negative effects of this mod.

There is a slight one: BMW has calibrated the a/f on these cars to very tight tolerances. If you do the mod, your car will run slightly rich for a split second after shifting. On Audis, it would actually trigger an engine check light, but I've never heard of this happening on BMWs.

One solution would be to cut the hose and add a plastic T, so that you have the noise and still some recirculation.
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  #183  
By Bcruskie on 03-19-2010, 09:14 PM
this is so confusing! can someone post some pictures for process ?
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  #184  
By burningchicken on 04-21-2010, 01:01 PM
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Quote:
Originally Posted by Bcruskie View Post
this is so confusing! can someone post some pictures for process ?
+1
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  #185  
By RUS0628 on 05-17-2010, 10:40 PM
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Quote:
Originally Posted by Bcruskie View Post
this is so confusing! can someone post some pictures for process ?
+ 1
I really wanna do this. Is there a video clip of the sound???
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  #186  
By burningchicken on 05-17-2010, 11:00 PM
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Quote:
Originally Posted by RUS0628 View Post
+ 1
I really wanna do this. Is there a video clip of the sound???
there is one on page 2 i believe. or 3
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  #187  
By RUS0628 on 05-19-2010, 05:01 PM
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Quote:
Originally Posted by burningchicken View Post
there is one on page 2 i believe. or 3
Yea I saw it. It sounds nice.
Does anyone has a picture of that 2nd hose that needs to be unplugged?
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  #188  
By KyLu II on 05-21-2010, 09:30 AM
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Quote:
Originally Posted by RUS0628 View Post
Yea I saw it. It sounds nice.
Does anyone has a picture of that 2nd hose that needs to be unplugged?
It's right behind the air box. Much easir if you take the cowel off
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  #189  
By Alexander on 06-05-2010, 02:51 PM
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Quote:
Originally Posted by KyLu II View Post
It's right behind the air box. Much easir if you take the cowel off
I just took the entire cowl and air box out.

I cannot hear mine!!!! At all!!! WTF.

I did it correctly and my plugs are tight. I'm kind of pissed, because I spent a lot of time on this with the cowl removal.
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  #190  
By prelude2perfect on 06-15-2010, 03:31 PM
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Just got done with this and I'm pretty happy with it. Not as loud as was hoping for but then again it isn't obnoxious which is great. You should definately be able to hear this if you did it correctly.

I did the electrical tape over the bung then screwed a plastic oil cap over it and taped over that just to be sure. I also pointed the hoses downwards in the bay to avoid getting oil over anything
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  #191  
By ZombiE92 on 06-23-2010, 07:44 AM
If someone decided to online and buy a legit BOV like a Tial or HKS (not AA, they're too proud of their product), what would be the cheapest place to get it?
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  #192  
By mac335 on 06-24-2010, 09:06 PM
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can you put more pics about this mod
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  #193  
By burningchicken on 07-07-2010, 08:26 PM
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Can someone post a picture of the plug secured in place?
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  #194  
By burningchicken on 07-11-2010, 03:33 PM
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  #195  
By Arnold_Powers on 08-01-2010, 06:05 AM
the tech at my local dealer even told me to do this. LOL i just used some plugs .. sounds sick with intake, jb+ and muffler cut. i like it
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  #196  
By crashcrf on 08-25-2010, 01:14 PM
I got my BMI DCI in the mail yesterday... so while i had the hood up did this mod.. its perfect jut enough noise so its not a ricer RFL BOV. Sounds great coupled to the DCI, you should hear it at 6500K when shifting!
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  #197  
By nestillo335i on 11-19-2010, 09:58 PM
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FYI: Did this mod like 2 months ago, car running perfect and I love the sound and the price LOL
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