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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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  #220  
By NoPwrOvrMe on 07-12-2012, 12:21 AM
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Quote:
Originally Posted by E90Company View Post
When you are removing the dv hose from the intake nipple, do you twist? how is it done? The gray thing isnt moving and I think I broke it...
You twist the grey part in the opposite direction or whichever way it makes the middle nipple pop out and the DV hose will just pull right out, might have to put some force in it when you're pulling.

When I did it i couldn't get the rear grey part to twist, so because I can, I twisted the whole damn hose until the grey nipple popped out and then was able to pull the hose off and then twisted the grey part with more free room.

You can do what I did at your own risk, I am not responsible if you break your hose.
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  #221  
By E90Company on 07-12-2012, 12:32 AM
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Quote:
Originally Posted by LBCC562 View Post
You twist the grey part in the opposite direction or whichever way it makes the middle nipple pop out and the DV hose will just pull right out, might have to put some force in it when you're pulling.

When I did it i couldn't get the rear grey part to twist, so because I can, I twisted the whole damn hose until the grey nipple popped out and then was able to pull the hose off and then twisted the grey part with more free room.

You can do what I did at your own risk, I am not responsible if you break your hose.
The only thing I am worried about is busting the nipple it connects to. Did you snap the plastic off when you twisted yours? I dont care if the hose breaks, I care more if the intake nipple breaks...
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  #222  
By NoPwrOvrMe on 07-12-2012, 01:56 AM
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Quote:
Originally Posted by E90Company View Post
The only thing I am worried about is busting the nipple it connects to. Did you snap the plastic off when you twisted yours? I dont care if the hose breaks, I care more if the intake nipple breaks...
I did not snap or break anything. I suggest you to warm up your car first if your car wasn't warmed up in the first place. Cold engine bay = cold parts = less malleable.

For me what I did was after pulling the front DV hose off I looked at how the grey part functioned, and seeing how it's only a small dimpled clip, I just twisted the ENTIRE pipe(not the grey clip) until the grey nipple popped and just yanked the hose off.

And again, i am not responsible for any damages if you proceed with my recommendations.
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  #223  
By EuroE92 on 07-16-2012, 07:08 PM
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I did this today.

However, like a few other people I couldn't get the back plug undone. I put a ton of pressure and still wouldn't budge. With both cower on and off. I stopped after a while because I feared breaking it.

Is there any harm that can happen from just being on one?

Please comment and let me know
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  #224  
By kpjo4 on 09-09-2012, 02:21 AM
When car is not in boost, how come there is still air pressure coming out of these diverter valve lines that are supposed to vent into the atmosphere? I figured only air would come out during boost and when the throttle plate closes.
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  #225  
By nnguyen04 on 10-02-2012, 01:29 PM
lollol just did this mod. nice! so easy! all you do is twist the two outer tabs so the inner tab moves to the opposite end and pull. dk why you guys are having a hard time. you can also remove the wiring assemble on top for more clearance.
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  #226  
By byoung8 on 11-01-2012, 02:56 AM
Just to be clear, only the tube connected to the intake side to be removed? Sounds easy enough. Could the entire tube be removed so its not just hanging around or is that impossible? Just want to make sure im not forgetting to unplug a tube when I try this out and hear the results. I want to see what im working with before heading out to home depot and buying the pipe caps (3/4") and 2 of them, right?
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  #227  
By dreweezy on 11-23-2012, 09:56 PM
everyone is bagging one everyone, haha
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  #228  
By stl335is on 11-10-2014, 01:11 PM
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Engine Malfunction - Reduced Power

I know this is an old thread, but in case someone else wants to try this, a word of caution. I tried this on my 2012 335is over the weekend (N54 engine), and got an "Engine Malfunction - Reduced Power" error after about 10 minutes of driving. Luckily reversing the mod cleared the error and I didn't have to take the car to the dealer. Maybe they added a sensor or something that wasn't there before.
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  #229  
By Vish8895 on 04-13-2015, 03:45 PM
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Did this to my car today, drove around for about 10 minutes and ran diags with 0 codes. Sound is there but the turbos seem really loud now. Also getting a bit of WG rattle and there was 0 before.

Anyone noticed the louder turbo spooling? Almost sounds like the pressures being dumped as it's being built, like holding the trigger on a air compressor gun.
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  #230  
By Sgop335 on 04-13-2015, 07:42 PM
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Quote:
Originally Posted by Vish8895 View Post
Did this to my car today, drove around for about 10 minutes and ran diags with 0 codes. Sound is there but the turbos seem really loud now. Also getting a bit of WG rattle and there was 0 before.

Anyone noticed the louder turbo spooling? Almost sounds like the pressures being dumped as it's being built, like holding the trigger on a air compressor gun.
Do you have factory dv or aftermarket?
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  #231  
By Vish8895 on 04-14-2015, 04:19 AM
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Quote:
Originally Posted by Sgop335 View Post
Do you have factory dv or aftermarket?
Hi thanks for the reply, i thought this thread might have been dead and gone!

Yes as far as i am aware the DV is stock, whole car is stock from what i can tell, only got it a week or so ago .
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  #232  
By Sgop335 on 04-14-2015, 06:52 AM
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Quote:
Originally Posted by Vish8895 View Post
Hi thanks for the reply, i thought this thread might have been dead and gone!

Yes as far as i am aware the DV is stock, whole car is stock from what i can tell, only got it a week or so ago .
Depending on the miles, your stock dv could be leaking or not holding boost quick enough. Thats one "benefit" of the closed loop system where leaks go un noticed as it is sucked back to the turno intake. I have data on stock and hyperboost dvs that show that.
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  #233  
By Vish8895 on 04-14-2015, 07:03 AM
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Quote:
Originally Posted by Sgop335 View Post
Depending on the miles, your stock dv could be leaking or not holding boost quick enough. Thats one "benefit" of the closed loop system where leaks go un noticed as it is sucked back to the turno intake. I have data on stock and hyperboost dvs that show that.
Hi bud,

It's done 76K miles over the last 8 years. Couldn't see any cracks but didn't feel around the joints/underside of the charge pipes.

The noise has gone since i put all the engine bay cowl back together so could well have been something else.

Would any codes have been thrown as i checked after the 25 mile trip to work and there were none .

Also, how can i best diagnose a cracked DV/Chargepipe.
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