E90Post
 


European Auto Source
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Bov- Blow Off Valve



Reply
 
Thread Tools Search this Thread
      02-12-2007, 10:35 PM   #1
335boosted2Dmax
Banned
5
Rep
323
Posts

 
Drives: Boosted
Join Date: Feb 2007
Location: Long Island

iTrader: (0)

Bov- Blow Off Valve

I hope people know that this car is a closed loop system, in which case a blow off valve will do damage to the car in the long run, what this system needs is a Diverter Valve which Diverts the air back into the system and does not release it..........I just hope people aren't just going out to get the BOV's just to get the noise.........just wanted to start a thread about this because people seem to be running out to get a BOV as soon as they get a 335i............
Appreciate 0
      02-12-2007, 10:41 PM   #2
SKBMW
Lieutenant Colonel
SKBMW's Avatar
No_Country
63
Rep
1,816
Posts

 
Drives: Bicycle
Join Date: Jan 2007
Location: 25 0′ 0″ N, 71 0′ 0″ W

iTrader: (0)

Send a message via MSN to SKBMW
Good info! BOV is totally unnecessary for that engine layout.
__________________
Appreciate 0
      02-12-2007, 10:55 PM   #3
SoCal335i
Banned
13
Rep
771
Posts

 
Drives: 2007 E92-TT Jet Blk Coral Red
Join Date: Jan 2007
Location: Cali

iTrader: (2)

Yes you are correct the bov does not do anything for performance. It is for the noise. Thats the only part im going to agree with you. Other than that it doesnt matter whether its closed loop or not, if you go with the right bov setup you will not cause surge and wont damage anything on the car. Furthermore when you blow off atmospheric instead of diverting you are running cooler because your not recirculating the uncompressed hot air thru the diverter valves, instead you are blowing it out. With the tial bov you might get some surge with the wrong spring and its a 50mm valve (the largest one in a bov) which is a little overkill. The hks is a well designed bov for this type of low boost setup and remains completely shut during idle because of the pull trigger type design and wont leak boost.
Appreciate 0
      02-12-2007, 11:07 PM   #4
335boosted2Dmax
Banned
5
Rep
323
Posts

 
Drives: Boosted
Join Date: Feb 2007
Location: Long Island

iTrader: (0)

The BMW turbo system is a closed loop system by which all unused boost that is spooled during off throttle and gear shifts must be re-routed within the system; it cannot be vented to the atmosphere due to the dependence on the MAF and ECU to properly read and interpret air flow dynamics within the intake tract. Therefore BOV's (Blow-Off Valves) are not used because they create a rich air/fuel condition (i.e. less air to fuel ratio) which will damage the catalytic converter, create soot on the exhaust pipes, and cause occasional misfiring (due to the purged air) which will result in ECU miscalculated timing adjustments and other errors.
Appreciate 0
      02-12-2007, 11:09 PM   #5
SoCal335i
Banned
13
Rep
771
Posts

 
Drives: 2007 E92-TT Jet Blk Coral Red
Join Date: Jan 2007
Location: Cali

iTrader: (2)

I heard that the sensors dont pick up anything from the diverters and that its on a map sensor system not maf??
Appreciate 0
      02-12-2007, 11:12 PM   #6
335boosted2Dmax
Banned
5
Rep
323
Posts

 
Drives: Boosted
Join Date: Feb 2007
Location: Long Island

iTrader: (0)

I'm not positive about that, I just assumed MAF.......
Appreciate 0
      02-12-2007, 11:15 PM   #7
SoCal335i
Banned
13
Rep
771
Posts

 
Drives: 2007 E92-TT Jet Blk Coral Red
Join Date: Jan 2007
Location: Cali

iTrader: (2)

If im right then it in fact doesnt do any harm to the car or affect the A/F ratio, And then you too will buy one
Appreciate 0
      02-12-2007, 11:17 PM   #8
335boosted2Dmax
Banned
5
Rep
323
Posts

 
Drives: Boosted
Join Date: Feb 2007
Location: Long Island

iTrader: (0)

The only problem, it is yet to be seen, I'm very iffy of the BOV with this closed loop system, I would rather put my money towards a TURBO back exhaust with a nice 3 inch wide Down Pipe
Appreciate 0
      02-12-2007, 11:21 PM   #9
SoCal335i
Banned
13
Rep
771
Posts

 
Drives: 2007 E92-TT Jet Blk Coral Red
Join Date: Jan 2007
Location: Cali

iTrader: (2)

It is on map sensor check this post out. I hear what you are saying but im spending a lot of money on this car so a $450 bov isnt going to stop me from getting anything else. You're not going to be able to fit 3" downpipeS on this car... Not enough room... they would hit each other where they connect to the turbos.

http://www.e90post.com/forums/showth...hlight=e92+map
Appreciate 0
      02-12-2007, 11:28 PM   #10
335boosted2Dmax
Banned
5
Rep
323
Posts

 
Drives: Boosted
Join Date: Feb 2007
Location: Long Island

iTrader: (0)

I still think the car is going to run rich even though you may not get any CEL's or error codes.....i don't know we will see eventually
Appreciate 0
      02-13-2007, 02:01 AM   #11
jp335i
First Lieutenant
17
Rep
380
Posts

 
Drives: 2013 M3 DCT
Join Date: Sep 2006
Location: Atlanta GA

iTrader: (3)

Quote:
Originally Posted by 335boosted2Dmax View Post
I'm not positive about that, I just assumed MAF.......
You should not make such a bold statement as your OP and then later say you are "Assuming" anything. System is MAP based.

Whether you would install a BOV or not is one thing but to tell others they are damaging their vehicle when you do not have all the facts is irresponsible.

Use the search, it's been discussed.
Appreciate 0
      02-13-2007, 02:04 AM   #12
wj4
Major General
United_States
120
Rep
7,723
Posts

 
Drives: E90 manual 335i
Join Date: Nov 2006
Location: Burbank, CA

iTrader: (8)

Send a message via AIM to wj4
Quote:
Originally Posted by jp335i View Post
You should not make such a bold statement as your OP and then later say you are "Assuming" anything. System is MAP based.

Whether you would install a BOV or not is one thing but to tell others they are damaging their vehicle when you do not have all the facts is irresponsible.

Use the search, it's been discussed.
Plus 1,000,000. How are you going to make such a bold statement based on assumptions. And the 335i is NOT a MAF system. My current car is a MAF system and you can't even run a VTA BOV, it will stall on you at random times.
Appreciate 0
      02-13-2007, 02:22 AM   #13
purplewidow
Lieutenant Colonel
purplewidow's Avatar
United_States
26
Rep
1,928
Posts

 
Drives: e92 335
Join Date: Feb 2007
Location: Chicago

iTrader: (2)

here is the best sounding one that i have heard!!!!!still i would never rice my beamer!!!! tune but not rice!!!



________
Volcano Vaporizer

Last edited by purplewidow; 03-29-2011 at 07:20 PM.
Appreciate 0
      02-13-2007, 02:34 AM   #14
SoCal335i
Banned
13
Rep
771
Posts

 
Drives: 2007 E92-TT Jet Blk Coral Red
Join Date: Jan 2007
Location: Cali

iTrader: (2)

Quote:
Originally Posted by purplewidow View Post
here is the best sounding one that i have heard!!!!!still i would never rice my beamer!!!! tune but not rice!!!


That one has the Greddy type rs bov on it... Thats pure rice buddy. Its not good for this car i dont think, i saw that you can buy an extension for it, you screw it on the front and makes it like a pull trigger type like the hks so it stays closed in idle so it doesnt make your rpms fluxuate at a red light. It might not sound the same with that extension on though.
Appreciate 0
      02-13-2007, 02:51 AM   #15
wj4
Major General
United_States
120
Rep
7,723
Posts

 
Drives: E90 manual 335i
Join Date: Nov 2006
Location: Burbank, CA

iTrader: (8)

Send a message via AIM to wj4
Just my 2cents, but the Greddy BOV's really suck. I've had 2 myself and the diaphragm on both went out causing a major boost leak...from 24psi to about 13psi. 4 of my friends also had the diaphragms on their type s and rs ripped.

I must be one of the few who thinks that the 335i has an integrity level it should maintain. And I'm almost certain those who go with VTA will get bored of the sound extremely quick. Everytime you let off the gas, you will hear it.
Appreciate 0
      02-13-2007, 11:24 AM   #16
Ultimate Racing
Lieutenant
Canada
18
Rep
469
Posts

 
Drives: 335i, Evo VIII, WRX, STi, 350Z
Join Date: Jan 2007
Location: Toronto, Canada

iTrader: (2)

Send a message via ICQ to Ultimate Racing Send a message via AIM to Ultimate Racing Send a message via MSN to Ultimate Racing
Quote:
Originally Posted by 335boosted2Dmax View Post
I still think the car is going to run rich even though you may not get any CEL's or error codes.....i don't know we will see eventually
The engine runs speed density (MAP sensor based). The engine will not run richer as the metering is done post BOV.

Darryl
www.ultimate-racing.com
Appreciate 0
      02-13-2007, 01:27 PM   #17
A. Hansen
Private
A. Hansen's Avatar
Germany
0
Rep
55
Posts

 
Drives: 997turbo
Join Date: Jan 2007
Location: Gremany

iTrader: (0)

The 335i uses bosch diverters

They choose them because of enviorment and noise.
So it's no problem to blow to air.

With a maf (VAG cars) only closed loop works because it's measuring mass air
Appreciate 0
      02-13-2007, 01:31 PM   #18
SoCal335i
Banned
13
Rep
771
Posts

 
Drives: 2007 E92-TT Jet Blk Coral Red
Join Date: Jan 2007
Location: Cali

iTrader: (2)

I love being right!!
Appreciate 0
      02-13-2007, 01:41 PM   #19
CASHBY
United_States
60
Rep
2,117
Posts

 
Drives: E90 335 "done up"
Join Date: Dec 2006
Location: GARAGE

iTrader: (2)

so would 2 forged 004 BOVs work, or would you need the new pipe to only have one BOV?

right now i run a Forged 004 BOV on my A4.... i have no issues with it and its runs a MAF.

Here is the 004 Valve



Made from billet aluminium, this atmospheric diverter valve dumps the charge-air to atmosphere creating the "Whoosh" sound when the throttle is lifted. This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably.

Unlike single piston or diaphragm diverter valves, this uses counter balanced springs and dual pistons to prevent the valve from leaking air into the intake system at idle. This prevents our diverter valves suffering any of the failures associated with single piston and diaphragm type diverter valves.

http://www.ecodetuning.com/shop/cart...t_detail&p=436
Appreciate 0
      02-13-2007, 02:33 PM   #20
schneid4323
Banned
United_States
52
Rep
1,134
Posts

 
Drives: 335i, M6
Join Date: Dec 2006
Location: Dallas TX

iTrader: (0)

Send a message via AIM to schneid4323
Quote:
Originally Posted by CEA 3 View Post
so would 2 forged 004 BOVs work, or would you need the new pipe to only have one BOV?

right now i run a Forged 004 BOV on my A4.... i have no issues with it and its runs a MAF.

Here is the 004 Valve



Made from billet aluminium, this atmospheric diverter valve dumps the charge-air to atmosphere creating the "Whoosh" sound when the throttle is lifted. This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably.

Unlike single piston or diaphragm diverter valves, this uses counter balanced springs and dual pistons to prevent the valve from leaking air into the intake system at idle. This prevents our diverter valves suffering any of the failures associated with single piston and diaphragm type diverter valves.

http://www.ecodetuning.com/shop/cart...t_detail&p=436

I wanna hear a video before I jump the gun on this...
Appreciate 0
      02-13-2007, 03:23 PM   #21
CASHBY
United_States
60
Rep
2,117
Posts

 
Drives: E90 335 "done up"
Join Date: Dec 2006
Location: GARAGE

iTrader: (2)

I have it on my A4...it isnt like a BOV sound...its more of a WOOOOOOSHH sound.

I like how it sounds though.

but i am not sure if it will even workwith our cars... you would have to run 2 of them.
Appreciate 0
      02-13-2007, 04:40 PM   #22
A. Hansen
Private
A. Hansen's Avatar
Germany
0
Rep
55
Posts

 
Drives: 997turbo
Join Date: Jan 2007
Location: Gremany

iTrader: (0)

Hi,

Who did your tuning on the a4 ?

It's possible to reprogram the motronic ECU
then the MAF sensor is shut off... the injection /ignition etc... is pure lambda based.

Only a few companys do this.

If they didn't do this you get 100% SURE CeL'S (CHECK ENGINE LIGHT)
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 -5. The time now is 08:37 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