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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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  #110  
By boostedtwin on 04-09-2007, 03:08 PM
Hey Alex, let me know if this actually changes the sound.
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  #111  
By M3to335 on 04-09-2007, 03:18 PM
I thought you said at the begining of the post to make sure to do both?
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  #112  
By boostedtwin on 04-09-2007, 03:22 PM
The TT makes the sound so much louder with the free BOV. No kidding, now I can hear some turbos.
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  #113  
By Red Star Rising on 04-09-2007, 05:01 PM
Quote:
Originally Posted by M3to335 View Post
I thought you said at the begining of the post to make sure to do both?
You have to cover the plugs left on the pre compression intake ducts when you remove the hoses. You have to leave the hoses open. They will release the pressure.

I am going to cover one to see if forcing all the air out of just one valve will make it louder or not.
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  #114  
By Red Star Rising on 04-09-2007, 05:02 PM
Quote:
Originally Posted by boostedtwin View Post
The TT makes the sound so much louder with the free BOV. No kidding, now I can hear some turbos.
More PSI = More sound.

Take me for a ride one of these days!
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  #115  
By ///Matt on 04-09-2007, 05:05 PM


have fun.
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  #116  
By boostedtwin on 04-09-2007, 05:11 PM
Will do.
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  #117  
By ulises 335i on 04-09-2007, 11:35 PM
hi any help on how to remove the diverter valves...i could'nt get them loose.
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  #118  
By teknochild on 04-09-2007, 11:38 PM
Quote:
Originally Posted by ulises 335i View Post
hi any help on how to remove the diverter valves...i could'nt get them loose.

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  #119  
By ulises 335i on 04-10-2007, 12:02 AM
Quote:
Originally Posted by teknochild View Post
then it wont be free.... i'll have to buy one of those.

never mind i got it off already....does'nt sound at all when i shift...mabe cuz i have an auto...but it sounds perty awesome when i let of the gas
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  #120  
By boostedtwin on 04-10-2007, 06:31 AM
if you shift without taking the foot out of the gas you won't hear anything.
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  #121  
By Red Star Rising on 04-10-2007, 04:54 PM
Quote:
Originally Posted by ulises 335i View Post
hi any help on how to remove the diverter valves...i could'nt get them loose.
Remember to only disconnect the hoses from the pre-compression sides!!!

You should hear it.
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  #122  
By Terry335 on 04-10-2007, 06:06 PM
Are the hoses crimped on to the diverter side?
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  #123  
By Red Star Rising on 04-10-2007, 07:12 PM
Quote:
Originally Posted by Terry Burger View Post
Are the hoses crimped on to the diverter side?
I believe they are not. They use the same connector as the other end.
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  #124  
By Terry335 on 04-10-2007, 11:44 PM
Hmm I can't figure out how to pop them off the diverter side. I'm tempted to just pry them with a screwdriver but I have a feeling it won't work.
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  #125  
By boostedtwin on 04-11-2007, 07:01 AM
Take your time and you'll be able to just turn them. It's kinda hard though at first.
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  #126  
By Raider on 04-11-2007, 07:53 AM
Quote:
Originally Posted by Terry Burger View Post
Hmm I can't figure out how to pop them off the diverter side. I'm tempted to just pry them with a screwdriver but I have a feeling it won't work.

Squeeze the white/greyish part and turn it clockwise, or to the side that have space in between them...the hose will pop out...


If you squeeze the whole thing it won't move, only squeeze the white part of the diverter's valve end and it'll just slide out...give it some force too.
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  #127  
By ulises 335i on 04-11-2007, 03:14 PM
you have to turn it counter-clockwise.
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  #128  
By Red Star Rising on 04-11-2007, 06:25 PM
Remember you do not disconnect it from directly under the DV!!! Disconnect where each hose meets the pre-compression ducts!
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  #129  
By teknochild on 04-11-2007, 10:05 PM
i did this to check it out today, see if the whole BO sound was as gay when its in your car as it is when you hear it on another peoples cars... i dont think its for me (especially since if your trying to cruis @ 60 you get a light woosh thats really annoying whenever you go from tiny bit throttle to none)

anyway, a few things occured to me, 1: the engine bay is hot, dont forget some materials will probably melt, i used 1 inch ID vinyl tubing and a pvc end cap (least ghetto i could think of, no electircal tape, i bet it would NOT do its job after heating up once or twice)

after that i noticed something else, between shifts it doesnt bleed all the pressure just a quick pop then it closes again, but if you leave it in gear it will stay open, seems like when its out of gear theres less vacuum as the engines reving down rather then being held at higher speeds by the wheels; and if this is true, then theres no way in hell its going to pen any other time and suck air in (that was pretty dumb idea in the first place)

besides that i liked it more than i thought i would, but not enough to keep it i dont think
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  #130  
By edgarj on 04-15-2007, 11:28 PM
Quote:
Originally Posted by teknochild View Post
i did this to check it out today, see if the whole BO sound was as gay when its in your car as it is when you hear it on another peoples cars... i dont think its for me (especially since if your trying to cruis @ 60 you get a light woosh thats really annoying whenever you go from tiny bit throttle to none)

anyway, a few things occured to me, 1: the engine bay is hot, dont forget some materials will probably melt, i used 1 inch ID vinyl tubing and a pvc end cap (least ghetto i could think of, no electircal tape, i bet it would NOT do its job after heating up once or twice)

after that i noticed something else, between shifts it doesnt bleed all the pressure just a quick pop then it closes again, but if you leave it in gear it will stay open, seems like when its out of gear theres less vacuum as the engines reving down rather then being held at higher speeds by the wheels; and if this is true, then theres no way in hell its going to pen any other time and suck air in (that was pretty dumb idea in the first place)

besides that i liked it more than i thought i would, but not enough to keep it i dont think
Teknochild, do you have PROcede, I cant recall? How does it compare in note to the TiAL and AA kits? can you actually hear it with the windows up without PROcede? The TiAl kit I have was practically forgettable untill I installed PROcede, now it's almost obnoxious as it's so much louder and sounds off under less that WOT and at lower rpm's.. My GF never even commented on the TiAl untill I nstalled PROcede, and then she instantly noticed the effect. I like it, but it may well get old quickly with the extra boost.

What's your theory on the valve dynamics you mentioned? Why would it behave differently than the aftermarket BOV's?
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  #131  
By bmwzimmer on 04-20-2007, 04:01 PM
Dang it, my fingers are getting jacked up from trying to pop off the diverter valve... The thing won't come off. I wanted to try this trick just for the heck of it. Do you pinch the Arrows or the tabs inside the slot opening?
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