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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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  #132  
By Raider on 04-20-2007, 04:04 PM
Quote:
Originally Posted by bmwzimmer View Post
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?

Pinch the greyish arrow looking thingie, and turn it to the empty side of the hose...that will disengage the lock, then just pull it straight up...


LOL, this is the simplest part of it, can't believe u guys are having so much trouble....
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  #133  
By 533ogetnom on 04-20-2007, 05:23 PM
you rotate the grey part, not the hose itself, and it can take a bit of force, counter clockwise BTW, dont put your finger on top of the tabs btw, put them on the opposite side that your trying to turn it and push on the sides of the grey tabs
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  #134  
By bmwzimmer on 04-20-2007, 05:31 PM
Man, I think mine is stuck. I pinched the Arrow things and twisted and it won't come off. My fingers are all red ok. I'll try it again later.

Anyone here still has their BOV set up this way? Any long term results or feedback?
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  #135  
By boostedtwin on 04-20-2007, 05:33 PM
YOu should be fine using it with no ill to the car. I installed an AA BOV since I wanted more sound coming out of the turbos.
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  #136  
By jrios_jr on 05-01-2007, 01:31 PM
so i did it this morning, well only half way, but sadly i broke the grey-ish part. does anyone know the part # so i can go buy 2 just incase i break the other one? i was only able to to the front one i still need to do the back one. so far it sounds prett good, but i def. want to see how it would sound with the other one out as well.

some of you guys just press it with your fingers. i had to use a pair of players and still had a hard time with it. i can't imagine how someone would be able to just use fingers for something like this. thanx in advance
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  #137  
By jrios_jr on 05-02-2007, 01:06 PM
and what about the part where the sounds comes from? i know it sholdn't be coverd, but should anything at all be done to this??? could something find it's way inside???
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  #138  
By Jason on 05-03-2007, 09:09 PM
Added to DIY master list - http://www.e90post.com/forums/showthread.php?t=1721

Thanks for sharing.
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  #139  
By M3to335 on 05-04-2007, 12:22 PM
So, does that also mean installing a real BOV is going to ruin the car? The installation of the real one involves changing many of the same things as the free-bee.
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  #140  
By jrios_jr on 05-04-2007, 01:39 PM
damn im getting the 25.1.1 upgrade and i need to change everything back... anyone know the part # for the gray-sih arrows..i broke
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  #141  
By Kozmo86 on 05-13-2007, 01:29 PM
DAMN! this rear hose is driving me CRAZY! i already broke one of those cramp thingys and i still cant get it off! HELP!! i got the front one off easily, but i cant seem to get a good grip on the rear hose and i am dying to find out what this trick can really do!! any hints anyone?? please!
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  #142  
By M3to335 on 05-26-2007, 10:13 AM
I keep blowing my caps (not pipe caps, but a different kind) off the diverter hoses. The tape turns to GUM as soon as the heat hits it.

Last night we bought 3/4" pipe caps and for the life of me I cant get it to fit. Are you sure thats the right size? Regardless, i think its going to pop it out of the hole as soon as I get on it.

Cars throwing an engine malfunction light every day now. Oh, btw, I have BOV so maybe I can just hook the diverter hose back up again since the diverters are hooked to each other eliminating them from opening.

Any thoughts or responses to the questions?
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  #143  
By A418t81 on 05-29-2007, 06:12 PM
Quote:
Originally Posted by M3to335 View Post
I keep blowing my caps (not pipe caps, but a different kind) off the diverter hoses. The tape turns to GUM as soon as the heat hits it.

Last night we bought 3/4" pipe caps and for the life of me I cant get it to fit. Are you sure thats the right size? Regardless, i think its going to pop it out of the hole as soon as I get on it.

Cars throwing an engine malfunction light every day now. Oh, btw, I have BOV so maybe I can just hook the diverter hose back up again since the diverters are hooked to each other eliminating them from opening.

Any thoughts or responses to the questions?
OMG, I've lurked as long as I can stand it, you turbo newbs are blowing my mind.

First of all, if you have caps over ANY piping that sees pressure, you've done it wrong. It sounds to me like you have capped off the ends of the tubing that comes off the DVs themselves rather than the "nubs" of the intake piping that the DV hosing attaches to The hosing from the Diverter valves must be free to atmosphere, the caps are there to plug the holes where the hosing used to attach to the intake plumbing and nothing more.

Also, LOL @ the "BMW engineering" when it comes to DV venting on a MAP based car. Frankly, I think "BOVs" on a 50k BMW are the absolute ultimate in rice, but thats not the point. There's NO rocket science behind the very simple recirculation setup that BMW has on the car. In fact, I'm curious to see how long the Bosch valves make it, they like to tear diaphragms all the time on low boost 1.8Ts and the like.

The vast majority in this thread need to learn a LOT more before they go running around giving "advice" to others.
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  #144  
By M3to335 on 05-30-2007, 05:56 PM
I never came back and corrected this post. I started a new one and made clear that the verbage was incorrect. Im capping the "inlet" side where the diverter hose was plugged in.

They arent blowing off, I suppose they are just POPPING off when the tape heats up. Then, it leaks, and I throw a light. The question was to those who have capped this. How are you capping it and keeping it sealed?

The diverter valves are free to the atomsphere but are NOT functional right now. They dont need to be since the BOV is doing its job. The vacuum line off one diverter is plugged into the vacuum line on the other rendering them useless and keeping them from opening. No problemo there.

I understand the concept, I just dont understand how these people think tape and a 52c pVC cap are the answer

Quote:
Originally Posted by A418t81 View Post
OMG, I've lurked as long as I can stand it, you turbo newbs are blowing my mind.

First of all, if you have caps over ANY piping that sees pressure, you've done it wrong. It sounds to me like you have capped off the ends of the tubing that comes off the DVs themselves rather than the "nubs" of the intake piping that the DV hosing attaches to The hosing from the Diverter valves must be free to atmosphere, the caps are there to plug the holes where the hosing used to attach to the intake plumbing and nothing more.

Also, LOL @ the "BMW engineering" when it comes to DV venting on a MAP based car. Frankly, I think "BOVs" on a 50k BMW are the absolute ultimate in rice, but thats not the point. There's NO rocket science behind the very simple recirculation setup that BMW has on the car. In fact, I'm curious to see how long the Bosch valves make it, they like to tear diaphragms all the time on low boost 1.8Ts and the like.

The vast majority in this thread need to learn a LOT more before they go running around giving "advice" to others.
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  #145  
By A418t81 on 05-30-2007, 06:03 PM
Ok, gotcha. I was seriously cracking up here imagining the caps in the DV vent tubes themselves Glad you got it taken care of.
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  #146  
By AKbmw on 05-31-2007, 06:57 PM
any pics of the 2nd hose u have to cover?!?!?
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  #147  
By trick50 on 06-01-2007, 01:19 PM
I think I might give this one a whirl this weekend. Will post pics when I am done and if possible a vid.
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  #148  
By AKbmw on 06-06-2007, 12:21 AM
will this work on an AUTO tranny...?
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  #149  
By IslandTurbo on 06-19-2007, 03:30 AM
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Ive tried it, it makes a sound. I used a rubber pipe cap and clamped it, but i only removed the front one not the rear,

Anydownside?

Does anybody Engine light appear when doing this, mine didnt but i only drove it around the block.

The idle seems to dip down and up, and it seems like the valve is constantly leaking at the end of the hose even at idle..

If this is messing somthing up some please tell me so i can plug it back in.


thanks
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  #150  
By de.abeja on 06-25-2007, 01:55 PM
Free bov, sounds only just loud enough. Stoked on the DIY
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  #151  
By Doss on 07-05-2007, 01:25 PM
Quote:
Originally Posted by E92!Dreier View Post
Attention : Anyone adding this noise-maker mod is not only risking their investment in and ruining the engineering of a 50,000 car, they are IMHO retarded.
You always get what you pay for.
The diverter valves are included in the 50K you've already paid for them.

Its an internal combustion engine not rocket science. People modify Porsche, Ferrari whatever, its all relative.

I'm gonna try this today nice DIY thanks Red Star Rising.
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  #152  
By Doss on 07-07-2007, 02:30 AM
Great Mod, I disconnected the front hose only, sounds great.
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  #153  
By 533ogetnom on 07-07-2007, 10:49 AM
Quote:
Originally Posted by Doss View Post
Great Mod, I disconnected the front hose only, sounds great.
im not sure about that...

on one hand it shouldn't really make a difference even if the other is opening and recirculating air into turbo #2s intake since they both charge the same piping so theres no pressure difference between the cylinders

but on the other hand, i just wouldn't want it happening

but after the thread about the BOV adapters, this brings up something, why not disconnect and cap the vacuum line too the other one and leave it connected and just DC the one hose; one louder/longer noise, more primal lion growl


might make it easier for people like (i forgot who) who end up with boost leaks after proceed to only have to switch out one spring, bleh which reminds me of another question
Last edited by 533ogetnom; 07-07-2007 at 11:26 AM.
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