E90Post
 


Extreme Power House
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > Yet another 3 dollar DIY BOV (get that woosh shift sound)



Reply
 
Thread Tools Search this Thread
      02-04-2013, 12:01 PM   #1
Evochuck
First Lieutenant
12
Rep
349
Posts

Drives: 335xi 09
Join Date: Jan 2013
Location: Montreal

iTrader: (2)

Yet another 3 dollar DIY BOV (get that woosh shift sound)

Since our cars are running with MAP sensors, its pretty safe to say the only reasons the air is plumbed back into the intake is for noise reasons (beacause a lot of ppl dont want a 55k car to woosh everytime they shift). FYI if you plan on installing an intake or DCI, it will make your install 2x easier

Before you stat the install you will need a few things:
-A good rachet kit
-7/8 rubber leg feets (7/8 is the inner diameter)
-1 inch worm clamps (for safety measures)



1) Unclip the top of your intake and remove it

2) Remove the air filter

3) Loosen the 2 worm clamps connecting the air box to the intake pipes(1), deattach the 3 cables running behind the box (2)(a nice upward tug will take em off), disconnect and move to the right the vac hose in front of the box(3).



4) Once this is all done, gently take unplug the 2 box outputs(filtered air) and the input (4)(i found that completely removeing that part made reinstallation easier, removed with 2 hex bolts on rad support)

5) Pull intake up and then towards you to remove it

6) You can now clearly see the DVs alonmg with their plumback tubes, disconnect the tubes from the piping by rotating the gray part of the connector and then pulling the tube.( stuffing you intake with rags is usualy a good idea since anything falling in there with go through your turbos)




7) Install rubber feet on tube end and secure it with worm clamp (realy not that necessary since there is no boost in those pipes, only vacuum.



8) Reinstall the airbox using reverse steps, make sure all clamps are properly secured.

9) You are done, enjoy the subtle woosh the stock DVs can provide (on stock boost that is)

It is probably safe to presume that you would be better off replacing them with forge DVs or BOVs if you want to run higher boost.
Appreciate 0
      02-04-2013, 02:32 PM   #2
BMW_Alex
Private
BMW_Alex's Avatar
United_States
-1
Rep
54
Posts

Drives: 2007 E92 335I 6MT
Join Date: Jan 2013
Location: Orlando, FL

iTrader: (0)

Can we get a quick vid to hear it. Thanks
__________________
07 E92 335I / 6MT /ALPINE WHITE & SADDLE BROWN / JB4G5 / BMS DCI / BMS DPs / BMS METH KIT / FSB / ETS CP / SYNAPSE BOV / BOOST GAUGE
Appreciate 0
      02-04-2013, 02:45 PM   #3
mrunella
New Member
mrunella's Avatar
1
Rep
23
Posts

Drives: 2007 BMW 335i
Join Date: Jan 2013
Location: AZ

iTrader: (0)

Sound clip and video?
Appreciate 0
      02-04-2013, 03:14 PM   #4
Evochuck
First Lieutenant
12
Rep
349
Posts

Drives: 335xi 09
Join Date: Jan 2013
Location: Montreal

iTrader: (2)




Done as we speak my jobs parking lot, the sound is ever so slightly louder with some load.
Appreciate 0
      07-09-2013, 11:16 PM   #5
_ink
Jedi samurai ninja turtle
_ink's Avatar
Australia
130
Rep
2,541
Posts

Drives: 335i 09' DCT M-Sport
Join Date: May 2012
Location: Sydney, Australia

iTrader: (0)

Awesome for those with Forged DV's looking for a change.
Appreciate 0
      07-10-2013, 04:42 AM   #6
RimasRS
Colonel
RimasRS's Avatar
49
Rep
2,419
Posts

Drives: 135i MT 2009 AW
Join Date: Sep 2010
Location: Europe

iTrader: (0)

I cant hear anything... sorry
Appreciate 0
      08-03-2013, 02:45 AM   #7
SINasTER
First Lieutenant
SINasTER's Avatar
Canada
9
Rep
306
Posts

Drives: 335xi 2008 E90
Join Date: Apr 2013
Location: Laval, Qc.

iTrader: (0)

Garage List
2008 BMW 335xi  [5.00]
Quote:
Originally Posted by RimasRS
I cant hear anything... sorry
+1

Doesnt seem any louder then stock.
__________________
Quote:
Logical thinking:
My GF hates my car... My car hates my GF...

Logic dictates to dump her, move on, find another trophy for the passenger seat 'cause finding another perfect car is near impossible !!
Appreciate 0
      08-03-2013, 09:23 AM   #8
Evochuck
First Lieutenant
12
Rep
349
Posts

Drives: 335xi 09
Join Date: Jan 2013
Location: Montreal

iTrader: (2)

I wasnt realy able to capture de difference on video, but its definitely there....
Appreciate 0
      08-05-2013, 11:01 PM   #9
COEHSP85
Second Lieutenant
COEHSP85's Avatar
United_States
4
Rep
216
Posts

Drives: 2015 BMW 320i Orion Silver
Join Date: Apr 2011
Location: 434

iTrader: (4)

Thank you for this DIY. Went to my local hardware store, picked up the plugs and removed the bypass hoses from the BOV. It sounds awesome now. Especially combined with un plugging the Exhaust Flap mod.
__________________
2007 E93 335i
Injen DCI & JB4
Appreciate 0
      08-05-2013, 11:29 PM   #10
StevenY.
///M
StevenY.'s Avatar
United_States
104
Rep
2,101
Posts

Drives: 10' SG e92 335i
Join Date: Aug 2012
Location: NYC

iTrader: (1)

Quote:
Originally Posted by COEHSP85
Thank you for this DIY. Went to my local hardware store, picked up the plugs and removed the bypass hoses from the BOV. It sounds awesome now. Especially combined with un plugging the Exhaust Flap mod.
Make a video if possible.
__________________
Appreciate 0
      08-07-2013, 08:49 AM   #11
zero2sixtyZ
Fighter Pilot
United_States
230
Rep
2,069
Posts

Drives: 6MT rickshaw
Join Date: Jan 2012
Location: Boston, MA

iTrader: (2)

Garage List
2007 335i Coupe  [5.00]
Any potential drawbacks to this? Error codes? I'm assuming there is no change to how the DVs operate / wear since this just plugs the reentry for the air.
__________________

07 E92 335i 6MT | MHD E40 v7.1 | BMS DCI | VRSF DP, FMIC & CP | PE Mod | Fuel-It Stg2 LPFP | Advan RS 18" | Fortune Auto / Swift | LUX 160 + Osram CBI | Dyno
Appreciate 0
      08-10-2013, 12:12 AM   #12
Jeffman
Lieutenant
Jeffman's Avatar
10
Rep
466
Posts

Drives: 2008 335xi E90
Join Date: Jul 2010
Location: Somewhere in America

iTrader: (1)

Garage List
I'm wondering whether there are any measurable performance gains? Maybe the excess boost air pressure can be released more quickly during shifts or throttle off?
__________________
MHD Self-Tuned E50 Map | Helix IC | Fuel-It Stage 2 LPFP + TBI | BMS DCI | BMS Thermostat Delete | CP-E Charge Pipe | Forge DV | Apex Arc-8 Hyper Silver | Michelin PSS | Cool Carbon Brake Pads | SS Brakelines | Z4 35is 2-Piece Front Rotors | Alpina B3 TCU Flash | KW-V1 Coilovers | Strut Brace | Lux Angel Eyes | CF Kidneys | Scoops | Rockford Fosgate P300-2 | Earthquake SWS-8xi | iStreamer DAC | BavSound Stage 1 Speaker Upgrade
Appreciate 0
      08-10-2013, 10:33 AM   #13
Evochuck
First Lieutenant
12
Rep
349
Posts

Drives: 335xi 09
Join Date: Jan 2013
Location: Montreal

iTrader: (2)

Quote:
Originally Posted by zero2sixtyZ View Post
Any potential drawbacks to this? Error codes? I'm assuming there is no change to how the DVs operate / wear since this just plugs the reentry for the air.

No codes will show up, nor performance gains, this is a strictly cosmetic mod.

I'll try to do a better video, its a pain to do with my JB4 WG setting, if I go too fast all you hear is wind on camera, if I go too slow, I cant get proper boost to vent....
Appreciate 0
      08-12-2013, 12:46 PM   #14
slowbmw
Enlisted Member
slowbmw's Avatar
0
Rep
38
Posts

Drives: 2007 335i Cpe, 2011 335XI Sdn
Join Date: Jul 2013
Location: Pittsburgh, PA

iTrader: (0)

No measurable performance gains, no codes, only POSSIBLE issue is that the DV valves are designed to work on DP. this means that the little diaphragm that is inside the DV will open based on MAP tube PSI-Charge pipe PSI=Diaphragm opening pressure. If there is no MAP tube pressure this means that the valve may open prematurely or open later than desired.

However, if the diaphragm is only designed based on force pressure (pressure in the charge pipe) then there is no worry at all because the only time the diaphragm flap will open is based on pressure shock...(when pressure is built (turbo spool) there is a small tube or channel that circulates around the diaphragm that presses the diagram closed under boost, and when you rapidly let off of the gas pedal (decrease in force pressure) the remaining pressure in that little channel will act as a low pressure venturi and suck the diaphgram open.

this is similar to how an expansion tank works in a hot water circulation system in a commercial building.
Appreciate 0
      08-13-2013, 10:16 AM   #15
mex2309
First Lieutenant
mex2309's Avatar
United_States
15
Rep
370
Posts

Drives: '10 335i MSport X-Drive AW
Join Date: Feb 2013
Location: PA

iTrader: (2)

Is this the same comparable noise you get from installing DCI?
__________________
M-Sport|OFT Tune|PE Exhaust|VRSF CP|Coded/Alpina Flash|15% Tint|Cyba 3.8 Chrome Tips|Splitters|Lux H8 160|M3 Spoiler Lip|Gloss Black Grille|12mm Spacers F/R
Appreciate 0
      08-13-2013, 03:04 PM   #16
Evochuck
First Lieutenant
12
Rep
349
Posts

Drives: 335xi 09
Join Date: Jan 2013
Location: Montreal

iTrader: (2)

Quote:
Originally Posted by mex2309 View Post
Is this the same comparable noise you get from installing DCI?
No, a DCI will give you a louder spooling sound and a tiny blowoff sound, this on the other hand greatly increases the blowoff sound
Appreciate 0
      08-14-2013, 09:03 AM   #17
zero2sixtyZ
Fighter Pilot
United_States
230
Rep
2,069
Posts

Drives: 6MT rickshaw
Join Date: Jan 2012
Location: Boston, MA

iTrader: (2)

Garage List
2007 335i Coupe  [5.00]
Did this over the past weekend. Not noticeable unless under decent load, or WOT then shift. Not a bad sound, but I may reverse this based on slowbmw's assessment.
__________________

07 E92 335i 6MT | MHD E40 v7.1 | BMS DCI | VRSF DP, FMIC & CP | PE Mod | Fuel-It Stg2 LPFP | Advan RS 18" | Fortune Auto / Swift | LUX 160 + Osram CBI | Dyno
Appreciate 0
      08-14-2013, 12:10 PM   #18
Evochuck
First Lieutenant
12
Rep
349
Posts

Drives: 335xi 09
Join Date: Jan 2013
Location: Montreal

iTrader: (2)

Quote:
Originally Posted by zero2sixtyZ View Post
Did this over the past weekend. Not noticeable unless under decent load, or WOT then shift. Not a bad sound, but I may reverse this based on slowbmw's assessment.
Thats is normal, your BOV will not vent boost unless you are creating some (wich incidently only happens under moderate to heavy load)
Appreciate 0
      08-15-2013, 03:30 PM   #19
Evochuck
First Lieutenant
12
Rep
349
Posts

Drives: 335xi 09
Join Date: Jan 2013
Location: Montreal

iTrader: (2)



Still does not do justice to the mod, but still a tiny bit better, id need my gf to film it from the outside to get a proper sound.
Appreciate 0
      08-23-2013, 10:29 AM   #20
bnd
Private First Class
bnd's Avatar
United_States
9
Rep
165
Posts

Drives: E92 N54 335xi
Join Date: Jul 2013
Location: Columbus, Ohio

iTrader: (3)

Quote:
Originally Posted by SINasTER View Post
+1

Doesnt seem any louder then stock.
I have both tubes disconnected and can clearly hear the blow off with no problem(under driving load), but thankfully it's not obnoxiously loud. Drive the car in 3rd gear up to 50-60mph and let off the accelerator, you should hear it blow off, if not you probably did this mod wrong. I did this mod to decrease the oil re-circulation more than the sound. You will see a small amount of oil blow off into the engine bay near the tubes, but just clean it up every other week or when you wash the car. Also, may want to point your pipes to an area that's easy to clean up.

In case anyone is wondering, until I could access the rear diverter, I only unhooked the front diverter and the car drove fine/could hear the blow off.

Also wanted to share an option for plugging the intake pipe holes. I used a $3 part from jegs which came in silver, blue or black. Thought the blue looked good... http://www.jegs.com/i/JEGS-Performan...00302/10002/-1 Not sure if this is the exact part size since I threw out the packaging(sorry), but it looks exactly like this. May be the -4AN size...






Last edited by bnd; 08-23-2013 at 10:41 AM.
Appreciate 0
      09-10-2013, 12:40 PM   #21
BMW-SRT
Second Lieutenant
United_States
28
Rep
219
Posts

Drives: 335i
Join Date: Jan 2011
Location: Fresno CA

iTrader: (0)

Quote:
Originally Posted by bnd View Post
I have both tubes disconnected and can clearly hear the blow off with no problem(under driving load), but thankfully it's not obnoxiously loud. Drive the car in 3rd gear up to 50-60mph and let off the accelerator, you should hear it blow off, if not you probably did this mod wrong. I did this mod to decrease the oil re-circulation more than the sound. You will see a small amount of oil blow off into the engine bay near the tubes, but just clean it up every other week or when you wash the car. Also, may want to point your pipes to an area that's easy to clean up.
Would it help to put the pipes in a container, empty Gatorade bottle or something, to collect the oil that comes out?
Appreciate 0
      09-10-2013, 01:58 PM   #22
bnd
Private First Class
bnd's Avatar
United_States
9
Rep
165
Posts

Drives: E92 N54 335xi
Join Date: Jul 2013
Location: Columbus, Ohio

iTrader: (3)

Quote:
Originally Posted by BMW-SRT View Post
Would it help to put the pipes in a container, empty Gatorade bottle or something, to collect the oil that comes out?
It's more of a vapor spray, not a drip or anything significant(for my car)... I guess you could put something to catch the excess, but a Gatorade bottle sounds a bit ugly for my taste. I'm personally okay with just cleaning it up every so often. IMO, you may want to monitor how much oil is coming out before you do anything and go from there.

Also, I'm installing an oil catch can this weekend, so I'll post back if that reduces the amount of oil spray coming out of the DV hoses.
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 09:33 PM.




e90post
e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST