to BOV or not to BOV

lordtristian55 · 02-01-2008, 12:18 PM

anyone here experiencing major problems with their BOV? i am looking at getting one but i have herd good and bad rumors about putting them on these cars. and will it affect my PROcede v2??

HyperM3 · 02-01-2008, 12:29 PM

No major problems reported here, dont know where youre getting your information. Do a search, youll find many threads on the subject. No it wont affect your Procede.

lordtristian55 · 02-01-2008, 12:35 PM

what BOV would you recommend?

HyperM3 · 02-01-2008, 12:36 PM

The one that provides the sound you like the best. I had a TIAL on my car because I like the "woosh" sound rather than the "Squeek" sound some of the others provide. Its all personal.

lordtristian55 · 02-01-2008, 12:41 PM

anywhere you can think of that i can hear different sound clips for different ones?

!Xoible · 02-01-2008, 12:42 PM

i heard HKS BOV and fell in love with BOV... although i'd normally hate the ricer sound

e90AW335i · 02-01-2008, 12:50 PM

Quote:

Originally Posted by mantis

i heard HKS BOV and fell in love with BOV... although i'd normally hate the ricer sound

Do you have that on your current ride in your sig...

Calgary Agent · 02-01-2008, 01:02 PM

Quote:

Originally Posted by lordtristian55

anywhere you can think of that i can hear different sound clips for different ones?

This one is unique

lordtristian55 · 02-01-2008, 01:10 PM

thanks for the help guys, keep the info coming.

Sleepr335 · 02-01-2008, 02:06 PM

I've got AA's bov kit. I like it. Its kind of a mix between a whoosh and a whistle.

335ifiend · 02-01-2008, 03:11 PM

just bought the hks bov today actually...should be fine...

!Xoible · 02-01-2008, 03:13 PM

Quote:

Originally Posted by e90AW335i

Do you have that on your current ride in your sig...

well ihave to swap to manual first and then i'll get it. it's gonna be 4 speed manual transmission... triple clutch. go big or go home...

Mr. 5 · 02-01-2008, 04:00 PM

Quote:

Originally Posted by MarkNg335i

I heard that on the n54(335i ) engine you don't need a BOV because excess air are recycle in the intake valve. Install a BOV will reduce hp. Anyone every heard of this?

I've heard of this but I don't know if it's ever been proven.

HyperM3 · 02-01-2008, 04:07 PM

Quote:

Originally Posted by MarkNg335i

I heard that on the n54(335i ) engine you don't need a BOV because excess air are recycle in the intake valve. Install a BOV will reduce hp. Anyone every heard of this?

I dynoed the same before the bov and after the bov. There isnt a "need" for a bov ever really(except in extreme 1000hp supra engines etc.) so your information isnt necessarily right. Its just an add-on to make noise and brighten up your engine bay when you pop the hood.

335boosted2Dmax · 02-01-2008, 04:10 PM

The reason why people agree and disagree apon the issue of a BOV on a CLOSED LOOP system is because some people have issues and some dont. The only reason why you can run a BOV on this closed loop system is because it has a MAP sensor and not a MAF sensor. Preferably I would run a Diverter valve which would be better for the system because it is rerouting all the air back into the system. The only diverter valve being offered is through FORGE right now. But I know WALKEDU ran a BOV and had some problems and others did not have any.

A BOV will not lose HP normally, but it has happened before on closed loop systems...........a proper mod would be a DV instead, you will start to see more people with heavier mods going with a DV instead of a BOV.........

Rob@RBTurbo · 02-01-2008, 04:13 PM

From the technical diagrams, it seems there are two BOVs; one per turbo bank. The blown-off air is recirculated back into the turbo's induction, this helps keep things quiet and I believe also provides some dampening affect for the turbos rotational slow down as well. Personally, I would want to pressure test the BOV(s) and see if they are prone to be leaky at peak desired boost pressures. If its a pretty solid unit, can maintain boost pressure without turbo efficiency robbing leaks... then why waste the $$$ replacing it? By design, we have to assume its reactionary blow off attributes are in check. IMO Blow off sound is not grounds for replacement. Functionality, reliability, cost, and install cleanliness are what matters to me, so if the stockers can pass the functionality test we'd be good to go. I definitely wouldnt convert it to a single BOV open air release setup if I could all help it.

Rob

BoostedE90 · 02-01-2008, 04:31 PM

Coming from an Audi this was a huge discussion. Like 335boosted2Dmax said the N54 is a closed loop system. With a closed, MAF-based system venting to atmosphere will cause the motor to run rich. The ECU meters incoming air via the MAF, and using inputs from the MAF, TPS, MAP, RPM, O2 sensor(s) to determine how long to fire the injectors. If that metered volume of air is vented the ECU has already taken it into account, and will fire the injectors long enough to match the volume or pre-metered air which can result in a rich condition.

I ran a GFB Stealth on my Audi set at 50/50 and the only time I saw my air/fuel ratio go rich was during shifts. So the "rich" time we are talking about is very minimal. So is it going to kill the car... probably not. But over time you might have some sensor(s) fail earlier due to running a little on the rich side.

HyperM3 · 02-01-2008, 04:34 PM

Quote:

Originally Posted by BoostedE90

Coming from an Audi this was a huge discussion. Like 335boosted2Dmax said the N54 is a closed loop system. With a closed, MAF-based system venting to atmosphere will cause the motor to run rich. The ECU meters incoming air via the MAF, and using inputs from the MAF, TPS, MAP, RPM, O2 sensor(s) to determine how long to fire the injectors. If that metered volume of air is vented the ECU has already taken it into account, and will fire the injectors long enough to match the volume or pre-metered air which can result in a rich condition.

I ran a GFB Stealth on my Audi set at 50/50 and the only time I saw my air/fuel ratio go rich was during shifts. So the "rich" time we are talking about is very minimal. So is it going to kill the car... probably not. But over time you might have some sensor(s) fail earlier due to running a little on the rich side.

However, the N54 isnt a MAF operated system like he also said. Therefore, theres no worry about making sure theres sufficient air recirculating through the system to correct the air/fuel compensation. It could care less if you vented 100% or 0%.

I335 · 02-01-2008, 04:34 PM

Not a BOV fan - don't like the idea of adding a new sound to my car. More exhaust sound sure, but an additional sound - just doesn't do it for me...

HyperM3 · 02-01-2008, 04:36 PM

Quote:

Originally Posted by I335

Not a BOV fan - don't like the idea of adding a new sound to my car. More exhaust sound sure, but an additional sound - just doesn't do it for me...

Which is an opinion and had nothing to do with the question from the OP. Theres enough threads on this forum filled with BOV opinions. Please try to keep them out of threads with valid questions.

BoostedE90 · 02-01-2008, 04:40 PM

Strictly an inquizitive question...

So what does the N54 measure air? It's definitely not a speed density system like the supra.

Quote:

Originally Posted by HyperM3

However, the N54 isnt a MAF operated system like he also said. Therefore, theres no worry about making sure theres sufficient air recirculating through the system to correct the air/fuel compensation. It could care less if you vented 100% or 0%.

Rob@RBTurbo · 02-01-2008, 04:40 PM

You are correct. Those who insist on the open air setups, most likely will see some rich spikes, which may or may not affect drivability. The air has already been metered, so technically fuel will be following to match that air. Recirculating it is going to be ideal, for sure. If its not hindering performance, look elsewhere for mods.

Rob

EDIT: I was under the impression this car is MAF based.

02-01-2008, 12:18 PM	#1
lordtristian55 Private First Class 8 Rep 113 Posts Drives: 07 335i e92 Join Date: Oct 2007 Location: vegas iTrader: (1)	to BOV or not to BOV anyone here experiencing major problems with their BOV? i am looking at getting one but i have herd good and bad rumors about putting them on these cars. and will it affect my PROcede v2??
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02-01-2008, 12:29 PM	#2
HyperM3 Too many Alex's, from now on, call me Beaufort 353 Rep 6,188 Posts Drives: See Sig Join Date: Feb 2007 Location: Lawrenceville, NJ iTrader: (8)	No major problems reported here, dont know where youre getting your information. Do a search, youll find many threads on the subject. No it wont affect your Procede. __________________ 13 HD FatBob 17 A4 Glacier/Black 1st Edition/Pre+/Sport/EurocodeTMD/Racechip 16 S6 (gone),14 S6 (gone),14 S6 (gone),13 S6 (gone),10 S4 (gone) 07 335i(gone)
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02-01-2008, 12:35 PM	#3
lordtristian55 Private First Class 8 Rep 113 Posts Drives: 07 335i e92 Join Date: Oct 2007 Location: vegas iTrader: (1)	what BOV would you recommend?
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02-01-2008, 12:36 PM	#4
HyperM3 Too many Alex's, from now on, call me Beaufort 353 Rep 6,188 Posts Drives: See Sig Join Date: Feb 2007 Location: Lawrenceville, NJ iTrader: (8)	The one that provides the sound you like the best. I had a TIAL on my car because I like the "woosh" sound rather than the "Squeek" sound some of the others provide. Its all personal. __________________ 13 HD FatBob 17 A4 Glacier/Black 1st Edition/Pre+/Sport/EurocodeTMD/Racechip 16 S6 (gone),14 S6 (gone),14 S6 (gone),13 S6 (gone),10 S4 (gone) 07 335i(gone)
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02-01-2008, 12:41 PM	#5
lordtristian55 Private First Class 8 Rep 113 Posts Drives: 07 335i e92 Join Date: Oct 2007 Location: vegas iTrader: (1)	anywhere you can think of that i can hear different sound clips for different ones?
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02-01-2008, 12:42 PM	#6
!Xoible Banned 875 Rep 46,010 Posts Drives: .... Join Date: Nov 2006 Location: . iTrader: (4) Garage List 2008 M3 [4.00] 2007 335i [9.00] 2008 528i [8.00] 2006 Infiniti - G35 ... [8.00]	i heard HKS BOV and fell in love with BOV... although i'd normally hate the ricer sound
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02-01-2008, 01:10 PM	#9
lordtristian55 Private First Class 8 Rep 113 Posts Drives: 07 335i e92 Join Date: Oct 2007 Location: vegas iTrader: (1)	thanks for the help guys, keep the info coming.
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02-01-2008, 02:06 PM	#10
Sleepr335 Private First Class 9 Rep 159 Posts Drives: 07' 335i Sedan; 04' VW Gli Join Date: Feb 2007 Location: North Lauderdale, FL iTrader: (4)	I've got AA's bov kit. I like it. Its kind of a mix between a whoosh and a whistle.
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02-01-2008, 03:11 PM	#11
335ifiend New Member 0 Rep 5 Posts Drives: 07 bmw 335i Join Date: Nov 2007 Location: hamilton ontario iTrader: (0)	just bought the hks bov today actually...should be fine...
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02-01-2008, 04:10 PM	#15
335boosted2Dmax Banned 12 Rep 323 Posts Drives: Boosted Join Date: Feb 2007 Location: Long Island iTrader: (0)	The reason why people agree and disagree apon the issue of a BOV on a CLOSED LOOP system is because some people have issues and some dont. The only reason why you can run a BOV on this closed loop system is because it has a MAP sensor and not a MAF sensor. Preferably I would run a Diverter valve which would be better for the system because it is rerouting all the air back into the system. The only diverter valve being offered is through FORGE right now. But I know WALKEDU ran a BOV and had some problems and others did not have any. A BOV will not lose HP normally, but it has happened before on closed loop systems...........a proper mod would be a DV instead, you will start to see more people with heavier mods going with a DV instead of a BOV.........
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02-01-2008, 04:13 PM	#16
Rob@RBTurbo Lieutenant Colonel 390 Rep 1,571 Posts Drives: '08 335I AT, '14 M6 DCT Join Date: Jan 2008 Location: St. Louis, MO iTrader: (5)	From the technical diagrams, it seems there are two BOVs; one per turbo bank. The blown-off air is recirculated back into the turbo's induction, this helps keep things quiet and I believe also provides some dampening affect for the turbos rotational slow down as well. Personally, I would want to pressure test the BOV(s) and see if they are prone to be leaky at peak desired boost pressures. If its a pretty solid unit, can maintain boost pressure without turbo efficiency robbing leaks... then why waste the $$$ replacing it? By design, we have to assume its reactionary blow off attributes are in check. IMO Blow off sound is not grounds for replacement. Functionality, reliability, cost, and install cleanliness are what matters to me, so if the stockers can pass the functionality test we'd be good to go. I definitely wouldnt convert it to a single BOV open air release setup if I could all help it. Rob
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02-01-2008, 04:31 PM	#17
BoostedE90 Lieutenant Colonel 60 Rep 1,690 Posts Drives: e90 335i 6MT Join Date: Nov 2007 Location: Tampa/Gainesville, FL iTrader: (5)	Coming from an Audi this was a huge discussion. Like 335boosted2Dmax said the N54 is a closed loop system. With a closed, MAF-based system venting to atmosphere will cause the motor to run rich. The ECU meters incoming air via the MAF, and using inputs from the MAF, TPS, MAP, RPM, O2 sensor(s) to determine how long to fire the injectors. If that metered volume of air is vented the ECU has already taken it into account, and will fire the injectors long enough to match the volume or pre-metered air which can result in a rich condition. I ran a GFB Stealth on my Audi set at 50/50 and the only time I saw my air/fuel ratio go rich was during shifts. So the "rich" time we are talking about is very minimal. So is it going to kill the car... probably not. But over time you might have some sensor(s) fail earlier due to running a little on the rich side.
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02-01-2008, 04:34 PM	#19
I335 Brigadier General 126 Rep 4,248 Posts Drives: '08 335i Coupe Join Date: Jan 2008 Location: New England iTrader: (11)	Not a BOV fan - don't like the idea of adding a new sound to my car. More exhaust sound sure, but an additional sound - just doesn't do it for me...
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02-01-2008, 04:40 PM	#22
Rob@RBTurbo Lieutenant Colonel 390 Rep 1,571 Posts Drives: '08 335I AT, '14 M6 DCT Join Date: Jan 2008 Location: St. Louis, MO iTrader: (5)	You are correct. Those who insist on the open air setups, most likely will see some rich spikes, which may or may not affect drivability. The air has already been metered, so technically fuel will be following to match that air. Recirculating it is going to be ideal, for sure. If its not hindering performance, look elsewhere for mods. Rob EDIT: I was under the impression this car is MAF based.
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