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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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  #154  
By danielg on 07-07-2007, 11:23 AM
That is a good question..

Why not only run one?
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  #155  
By danielg on 07-07-2007, 11:30 AM
and why is this thread on page 8, but i'm still posting on page 7.
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  #156  
By RiXst3r on 07-08-2007, 03:12 PM
Quote:
Originally Posted by danielg View Post
and why is this thread on page 8, but i'm still posting on page 7.
because there were lots of posts deleted by moderators because of foul language, and a bug in phpbb (the software this site runs) causes it do a pagecount function on the post count before deletion...
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  #157  
By grw245 on 07-09-2007, 12:15 AM
Well if your going to do this mod I would deff say go out and buy a real BOV not just have the stock DV sitting to open air and dust -n- sh*t. Plus it sounds better than some quiet ass psssshhhhhhhhh. I mean thats the whole point of f**kin with this mod anyway is to hear that sound.
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  #158  
By E90Russ on 07-14-2007, 08:28 PM
i did this mod today. for the price invested it's pretty sweet. i went to home depot and bought some 3/4" pipe plugs but they didnt fit at all so i ended up using a bottle cap which worked suprisingly well along w/ some electrical tape. i'd like to find a better solution for capping the ends. my ultimate plan is to get a real BOV though. i LOVE the sound!

I give this mod two thumbs up, thanks for putting it out there.
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  #159  
By RiXst3r on 07-17-2007, 09:51 AM


...
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  #160  
By slapmyfro on 08-24-2007, 11:24 PM
so whats the verdict on this mod

i have heard almost every positive and negative to this mod

1) will it throw an engine light?
2) do you need to do both lines?
3) will it hurt / hinder performance?
4) are there any negative effects to this?

all these posts and no definate answers. 1/2 say its ok and 1/2 say dont do it. i want to do it just to see the sound, but dont want to if any of the above will happen

can a real tech please answer this once and for all
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  #161  
By IS2000 on 08-25-2007, 02:27 AM
Question

OT: I was checking out the diverter valve hoses today (like the picture on the 1st page), and noticed some greasy residues on it. It looks almost like something is leaking out of it. Is this normal?
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  #162  
By slapmyfro on 08-25-2007, 12:05 PM
ok i got the first hose off in literally 2 seconds

that one is no problem

i have tried everything to twist the second one, and i have decided i just cant get it twisted. i cant seem to do it, and if im having this much trouble, then getting it twisted back on will also be a pain in the ass

i know exactly what i have to do i just cant get it done

so i was wondering if i can just do the front hose. what will happen?

i know your supposed to do both but i dont want to touch the back hose.

is this ok?

or you either do both or none.

please let me know
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  #163  
By RiXst3r on 08-29-2007, 01:05 PM
Quote:
Originally Posted by IS2000 View Post
OT: I was checking out the diverter valve hoses today (like the picture on the 1st page), and noticed some greasy residues on it. It looks almost like something is leaking out of it. Is this normal?
me too... see this thread...
http://www.e90post.com/forums/showthread.php?t=80769
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  #164  
By theprinceofpersia54 on 09-05-2007, 07:13 PM
if u open the air box of a turbo car it makes that same sound, so im geussing an intake is better than doing this risk stuff, i open the air box of a rental and it sounded amazing. you can actually see the air box bouncing becuase its open.

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  #165  
By BoostedBMW on 09-05-2007, 08:23 PM
Quote:
Originally Posted by theprinceofpersia54 View Post
if u open the air box of a turbo car it makes that same sound, so im geussing an intake is better than doing this risk stuff, i open the air box of a rental and it sounded amazing. you can actually see the air box bouncing becuase its open.

If that sounds amazing then I think I need to get my hearing checked.
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  #166  
By deck on 11-07-2007, 07:16 PM
After reading this thread, i believe it is safe to say that this 'mod' would not have an ill affect on the car. I am curious as to why nobody has brought up one point. Although this 'mod' shouldnt give the car any power, it is still removing that HOT air being forced back into our intake. Just comon sense tells me that it should benefit the car in some way (although prolly not enough to claim added power) by removing that HOT air from your intake. Just my 2cents.
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  #167  
By O-cha on 11-07-2007, 07:59 PM
Quote:
Originally Posted by RiXst3r View Post
Yea with those off all the oils going to be going in your engine bay instead of back into the system. I'll bet it would bleed it dry.
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  #168  
By infamous335i on 02-24-2008, 05:43 PM
does anyone know if only doing one valve and not the other will have a bad effect on the car?? i cant seem to get the rear one loose and i tried everything.
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  #169  
By Mattscott on 02-24-2008, 06:33 PM
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Quote:
Originally Posted by deck View Post
After reading this thread, i believe it is safe to say that this 'mod' would not have an ill affect on the car. I am curious as to why nobody has brought up one point. Although this 'mod' shouldnt give the car any power, it is still removing that HOT air being forced back into our intake. Just comon sense tells me that it should benefit the car in some way (although prolly not enough to claim added power) by removing that HOT air from your intake. Just my 2cents.
Because hot air is better then no air. If the air were released into the atmosphere it would drop the boost. The diverter valves help keep the turbo spooling inbetween gears.
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  #170  
By landon305 on 03-14-2008, 05:33 PM
how do you take the hose offff??????????? ive been trying all moorning/
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  #171  
By IslandTurbo on 04-02-2008, 07:20 PM
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This mod leaks air even before boost is made, Stock valves seem too loose to be running open atmosphere.
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  #172  
By infamous335i on 04-06-2008, 08:43 PM
how many have occurred problems with their cars after doing this little mod??? just wondering.
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  #173  
By DaleT on 09-01-2009, 08:05 PM
someone please post a picture of that second valve!
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  #174  
By Hecticrulerz on 09-01-2009, 10:01 PM
OK There is no real negative to do this mod. The oil residue you guys are seeing is the oil vapor which is all over our cars engine internals anyway. Only way to get rid of that is with a catch can. The diverter valves do seem to be leaking boost or just open when the car is idle in park? Maybe they are kept open on purpose.

To take the second hose off you have to take off the power wire holding tray thing on the top so you can get better grip I used a flat head to help me get more leverage and it goes back on easily just make sure you lock them back right.
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  #175  
By marconi118 on 09-02-2009, 07:56 AM
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can I suoress one of the 2 Diverter valves?

Why 2 on the same connecting pipe? One BOV is just needed...
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