E90Post
 


GTB Performance
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > BOV, negative performance impact?



Reply
 
Thread Tools Search this Thread
      05-27-2011, 10:15 PM   #1
///M3THOD
Major
 
///M3THOD's Avatar
 
Drives: F06 GranCoupe, CLS63
Join Date: Dec 2009
Location: ATL/Buckhead

Posts: 1,473
iTrader: (26)

BOV, negative performance impact?

I have been wanting to pick up a charge pipe and BOV primarily because I am questing if my stock DV's are holding the boost my car is making on Map 2 w/ my JB4. When they vent they sound really "fluttery" for lack of a better description and my JB4 integrated boost on fuel is all over the place.

Anyway.. I was reading through the Procede website FAQ's and noticed the comment about BOV's, as follows;


"Q: I am very interested on installing a BOV (Blow-off Valve), is that going to be a problem?

A: It is best for one to resist the temptation of installing an aftermarket BOV as our cars were not designed to release excess boost pressure into the atmosphere. Doing so will effect the PROcede’s tuning and cause the car to run poorly. The car was designed to recirculate that excess air back into the intake system. Bleeding off the air that was accounted for by the MAF sensor will confuse everything."




With the majority of full bolted on people here running BOV setups that are not recirculated, I was wondering if any can actually quantify this?

I am definitely swapping my BOV's out, but now I am wondering if I should just get some Forge's and recirculate them.

Any insight appreciated.
///M3THOD is offline   United_States
0
Reply With Quote
      05-27-2011, 10:18 PM   #2
Forcefed3
Banned
 
Drives: 2008 335i
Join Date: May 2010
Location: South

Posts: 4,742
iTrader: (2)

Garage List
2008 335i  [0.50]
We dont have a MAF sensor. Who ever wrote that needs to reassess their statement. You will be fine.
Forcefed3 is offline   No_Country
0
Reply With Quote
      05-27-2011, 10:27 PM   #3
///M3THOD
Major
 
///M3THOD's Avatar
 
Drives: F06 GranCoupe, CLS63
Join Date: Dec 2009
Location: ATL/Buckhead

Posts: 1,473
iTrader: (26)

Quote:
Originally Posted by gbreeE90 View Post
We dont have a MAF sensor. Who ever wrote that needs to reassess their statement. You will be fine.
Straight off Vishnu's website.

Excellent then, BOV it is. Thanks for your reply.
///M3THOD is offline   United_States
0
Reply With Quote
      05-27-2011, 10:31 PM   #4
Forcefed3
Banned
 
Drives: 2008 335i
Join Date: May 2010
Location: South

Posts: 4,742
iTrader: (2)

Garage List
2008 335i  [0.50]
Quote:
Originally Posted by ///M3THOD View Post
Straight off Vishnu's website.

Excellent then, BOV it is. Thanks for your reply.
Maybe they were talking about the N55. No problem.
Forcefed3 is offline   No_Country
0
Reply With Quote
      05-27-2011, 11:11 PM   #5
Brey335i
Brigadier General
 
Brey335i's Avatar
 
Drives: e46 ///M3
Join Date: Oct 2009
Location: Austin, TX

Posts: 4,737
iTrader: (11)

Yeah I've read that too a while back... straight up ignore it
Brey335i is offline  
0
Reply With Quote
      05-28-2011, 12:26 AM   #6
Tzu
Major
 
Drives: 335i
Join Date: Jun 2010
Location: Toronto

Posts: 1,438
iTrader: (1)

Vishnu also told me a few days ago that the Procede does account for recirculation.

I dont believe that the recirculation is much to worry about with respect to what we perceive when we drive. I do think that the surge of air during shifts do help to keep the turbine spooled, but is probably only most effective when tracking, or serious time-trial driving.

Ultimate performance = DV's
Compromise = BOV

Just my opinion.
Tzu is offline   Canada
0
Reply With Quote
      05-28-2011, 12:31 AM   #7
NiVeDh
Major General
 
NiVeDh's Avatar
 
Drives: '08 E90 335i 6MT BSM
Join Date: Apr 2009
Location: Houston, TX & Atlanta, GA

Posts: 7,987
iTrader: (132)

Garage List
I'm pretty happy with my Forge DVs. I don't care much for the BOV sound, especially with the unwanted attention it might bring (car is loud enough as is). I've also heard that the Procede accounts for recirculation.
NiVeDh is offline   India
0
Reply With Quote
      05-28-2011, 12:33 AM   #8
Forcefed3
Banned
 
Drives: 2008 335i
Join Date: May 2010
Location: South

Posts: 4,742
iTrader: (2)

Garage List
2008 335i  [0.50]
Quote:
Originally Posted by Tzu View Post
Vishnu also told me a few days ago that the Procede does account for recirculation.

I dont believe that the recirculation is much to worry about with respect to what we perceive when we drive. I do think that the surge of air during shifts do help to keep the turbine spooled, but is probably only most effective when tracking, or serious time-trial driving.

Ultimate performance = DV's
Compromise = BOV

Just my opinion.
Thats not how it works.
Forcefed3 is offline   No_Country
0
Reply With Quote
      05-28-2011, 12:34 AM   #9
tibra1
Banned
 
Drives: 2011 ZCP M3 - 2007 335i crashd
Join Date: Apr 2009
Location: NYC

Posts: 6,777
iTrader: (4)

Quote:
Originally Posted by ///M3THOD View Post
I have been wanting to pick up a charge pipe and BOV primarily because I am questing if my stock DV's are holding the boost my car is making on Map 2 w/ my JB4. When they vent they sound really "fluttery" for lack of a better description and my JB4 integrated boost on fuel is all over the place.

Anyway.. I was reading through the Procede website FAQ's and noticed the comment about BOV's, as follows;


"Q: I am very interested on installing a BOV (Blow-off Valve), is that going to be a problem?

A: It is best for one to resist the temptation of installing an aftermarket BOV as our cars were not designed to release excess boost pressure into the atmosphere. Doing so will effect the PROcede’s tuning and cause the car to run poorly. The car was designed to recirculate that excess air back into the intake system. Bleeding off the air that was accounted for by the MAF sensor will confuse everything."




With the majority of full bolted on people here running BOV setups that are not recirculated, I was wondering if any can actually quantify this?

I am definitely swapping my BOV's out, but now I am wondering if I should just get some Forge's and recirculate them.

Any insight appreciated.
I would say Forge.. recirculation is the OE setup...unless u really want that BOV sound..i would rather every bit of air dumped back into the intake rather than vented..its a minscule amt but every bit helps
tibra1 is offline   No_Country
0
Reply With Quote
      05-28-2011, 12:35 AM   #10
Forcefed3
Banned
 
Drives: 2008 335i
Join Date: May 2010
Location: South

Posts: 4,742
iTrader: (2)

Garage List
2008 335i  [0.50]
Quote:
Originally Posted by tibra1 View Post
I would say Forge unless u want that BOV sound..i would rather every lil bit of air dumped back into the intake rather than vented..its a minscule amt but every bit helps
You would rather hot air be recirculated? What would that little bit help with? The turbo's are not starved of air as is.
Forcefed3 is offline   No_Country
0
Reply With Quote
      05-28-2011, 01:30 AM   #11
tibra1
Banned
 
Drives: 2011 ZCP M3 - 2007 335i crashd
Join Date: Apr 2009
Location: NYC

Posts: 6,777
iTrader: (4)

And the performance advantages of BOVs are what exactly?
tibra1 is offline   No_Country
0
Reply With Quote
      05-28-2011, 01:34 AM   #12
Forcefed3
Banned
 
Drives: 2008 335i
Join Date: May 2010
Location: South

Posts: 4,742
iTrader: (2)

Garage List
2008 335i  [0.50]
Quote:
Originally Posted by tibra1 View Post
And the performance advantages of BOVs are what exactly?
I didn't say there was a performance advantage. I was just correcting you. Unless you want to know the minuscule advantages such as not recirculating hot air and blow by.
Forcefed3 is offline   No_Country
0
Reply With Quote
      05-28-2011, 01:40 AM   #13
tibra1
Banned
 
Drives: 2011 ZCP M3 - 2007 335i crashd
Join Date: Apr 2009
Location: NYC

Posts: 6,777
iTrader: (4)

well my point is if its a choice between the OEM setup or a non OEM setup..i would pick the OEM (DVs)..especially if there are no performance advantages w the BOV..plus i find the sound annoying..but i understand there are some that like it
tibra1 is offline   No_Country
0
Reply With Quote
      05-28-2011, 04:35 AM   #14
Tim@EMSTUNING
 
Tim@EMSTUNING's Avatar
 
Drives: A BMW on Boost.... ;)
Join Date: May 2011
Location: Miami

Posts: 15
iTrader: (0)

The Purpose of the Blow Off Valve is help eliminate "Kompressor Surge" which is pressurized air that is recirculating back to the turbos and depreciating the life of the Kompressors Units. The Factory diverter valves are designed for the "standard boost pressure" to help recirculate the vented air and reduce the sound of the pressurized air that is released. Hopefully this information will be helpful to the OP and those who needed clarification.
Tim@EMSTUNING is offline   Denmark
0
Reply With Quote
      05-28-2011, 07:31 AM   #15
**335i**
Colonel
 
**335i**'s Avatar
 
Drives: TOYOTA & 2008 E92 335i 6MT
Join Date: Jul 2007
Location: Swiss-Lithuania

Posts: 2,258
iTrader: (4)

Garage List
2008 335i  [4.50]
Quote:
Originally Posted by tibra1 View Post
And the performance advantages of BOVs are what exactly?
only sound
__________________
E92 335i Black Saphire 6MT PROcede V5, BMS DCI, Big Tom IC, AR CL-DP's 3", AR Design OC, Forge DV's, OEM M3 side skirts, BMW Performance Wheels 19 inch 269 Black Gloss+Continental ContiSportContact 5P (400hp and 550nm) Next: QUAIFE LSD
**335i** is offline   Switzerland
0
Reply With Quote
      05-28-2011, 07:36 AM   #16
forza1976
Brigadier General
 
forza1976's Avatar
 
Drives: 2014 A6
Join Date: Aug 2007
Location: Denver CO

Posts: 4,523
iTrader: (11)

Garage List
2014 Audi A6  [5.00]
Bov = boy racer wet dreams.
forza1976 is offline   United_States
0
Reply With Quote
      05-28-2011, 10:05 AM   #17
TheKuz
Private
 
Drives: 2007 BMW 335i
Join Date: May 2011
Location: Charlotte, NC

Posts: 79
iTrader: (0)

NiVeDh..I love your suspension...what are you running?
TheKuz is offline  
0
Reply With Quote
      05-28-2011, 10:24 AM   #18
Forcefed3
Banned
 
Drives: 2008 335i
Join Date: May 2010
Location: South

Posts: 4,742
iTrader: (2)

Garage List
2008 335i  [0.50]
Quote:
Originally Posted by TheKuz View Post
NiVeDh..I love your suspension...what are you running?
Forcefed3 is offline   No_Country
0
Reply With Quote
      05-28-2011, 12:25 PM   #19
Tzu
Major
 
Drives: 335i
Join Date: Jun 2010
Location: Toronto

Posts: 1,438
iTrader: (1)

Quote:
Originally Posted by gbreeE90 View Post
Thats not how it works.
Elaborate?
Tzu is offline   Canada
0
Reply With Quote
      05-28-2011, 01:13 PM   #20
NiVeDh
Major General
 
NiVeDh's Avatar
 
Drives: '08 E90 335i 6MT BSM
Join Date: Apr 2009
Location: Houston, TX & Atlanta, GA

Posts: 7,987
iTrader: (132)

Garage List
Quote:
Originally Posted by TheKuz View Post
NiVeDh..I love your suspension...what are you running?
Bilstein PSS9.
NiVeDh is offline   India
0
Reply With Quote
      05-28-2011, 06:51 PM   #21
Forcefed3
Banned
 
Drives: 2008 335i
Join Date: May 2010
Location: South

Posts: 4,742
iTrader: (2)

Garage List
2008 335i  [0.50]
Quote:
Originally Posted by Tzu View Post
Elaborate?
The little bit of hot air being recirculated is not going to keep the turbo spooling. Exhaust gas is what powers the turbo, not intake charge.
Forcefed3 is offline   No_Country
0
Reply With Quote
      05-28-2011, 08:16 PM   #22
Tzu
Major
 
Drives: 335i
Join Date: Jun 2010
Location: Toronto

Posts: 1,438
iTrader: (1)

My mistake. I just took another look at the recirculation diagram. I thought the recirculated air was pumped back into the intake tract a little closer to the impeller.

Either way, shoving a bit more air back into the intake cant hurt either. Not to say that would prevent me from getting one. I'm still considering options myself.
Tzu is offline   Canada
0
Reply With Quote
Reply

Bookmarks

Tags
bov, negative impact

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 -5. The time now is 03:49 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, 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