BOV Necessary?

E90Vader · 05-16-2011, 01:13 AM

Just wondering if an aftermarket BOV is necessary for our cars?
once COBB comes out with there stage 2 tune, the boost will be quite high! Will a BOV increase performance or help the car in any way? Or is it just a gimmick for sound?

Not sure if the sound would even be noticeable on a Steptronic tranny?

NiVeDh · 05-16-2011, 01:16 AM

You won't be able to hear it over your straight pipe exhaust anyway.

JayKay335i · 05-16-2011, 01:19 AM

get diverter valves

Penn999 · 05-16-2011, 07:29 AM

Quote:

Originally Posted by E90Vader

Just wondering if an aftermarket BOV is necessary for our cars?
once COBB comes out with there stage 2 tune, the boost will be quite high! Will a BOV increase performance or help the car in any way? Or is it just a gimmick for sound?

Not sure if the sound would even be noticeable on a Steptronic tranny?

Its really your preference, I just like the sound. Anything is bettee than stock, exspecially if you have a tune and are running 14+psi

X2Board · 05-16-2011, 08:30 AM

Quote:

Originally Posted by NiVeDh

You won't be able to hear it over your straight pipe exhaust anyway.

That was my first thought too.

Syndicategt · 05-16-2011, 10:21 AM

Either a BOV or upgraded DV's will be able to hold higher levels of boost better than the stock DV's. But to answer your question, No, just adding a BOV will not increase power. You will hear it on the AT when you let off the gas pedal.

Zeph · 05-16-2011, 10:42 AM

Quote:

Originally Posted by Syndicategt

Either a BOV or upgraded DV's will be able to hold higher levels of boost better than the stock DV's. But to answer your question, No, just adding a BOV will not increase power. You will hear it on the AT when you let off the gas pedal.

+1 stock DV's are plastic with rubber diaphrams... I wouldn't even trust them on stage 1 much less stage 2! BOV's for sounds are really more noticeable in manuals

I would upgrade the charge pipe though, either way you go. The metal pipes seem to help with throttle response as opposed to the stock rubber/baffled hose. .02

Willizm · 05-16-2011, 10:44 AM

Yep, got a Tial BOV for the sake of not having to worry about my weak DV's leaking. ETS didn't have an option for DV's or I would have probably gone that route. On an AT car the sound isn't noticeable unless you are purposely goosing it and letting off.

E90Vader · 05-16-2011, 08:35 PM

Was not sure if the stock BOV was sufficient or if I really should look into a new BOV.
Thanks for the info guys.

I read somewhere that Charge pipes were not necessary.. People are starting to think they are needed as well!?

Penn999 · 05-16-2011, 08:50 PM

Quote:

Originally Posted by E90Vader

Was not sure if the stock BOV was sufficient or if I really should look into a new BOV.
Thanks for the info guys.

I read somewhere that Charge pipes were not necessary.. People are starting to think they are needed as well!?

you read wrong, as i said..its been tested that anything over 14ish psi and you are going to have a slight leak from the stock DV's. they werent designed to hold boost over 6-8psi. If you have a tune you are asking them to hold twice as much psi as they were designed to hold...

Toker335i · 05-17-2011, 12:14 AM

I got a er charge pipe with hks bov and i love it! Get it!

Brey335i · 05-17-2011, 12:15 AM

My stock charge pipe and DV's leaked a little... no problem after I upgraded

E90Vader · 05-17-2011, 07:59 PM

Whats the difference between a diverter valve and a BOV? How much do Charge pipes cost + install?

PeteW84 · 05-18-2011, 12:36 AM

Quote:

Originally Posted by E90Vader

Whats the difference between a diverter valve and a BOV? How much do Charge pipes cost + install?

The main difference between the two is that DV's divert/dump the air back to the charge pipe, your stock set up. Blow off valves, on the other hand release/dump the air into the atmosphere not the charge pipe, creating the wossshh sound. Some people like the sound, some don't...

Zeph · 05-18-2011, 08:42 AM

Quote:

Originally Posted by Pete84

The main difference between the two is that DV's divert/dump the air back to the charge pipe, your stock set up. Blow off valves, on the other hand release/dump the air into the atmosphere not the charge pipe, creating the wossshh sound. Some people like the sound, some don't...

I love the sound of some BOV's, like the Synapse... I like them as long as they don't squeel! I also like getting rid of the hot air and not re-using it. My wife, on the other hand, liked it better when it was "quiet and tame". Fortunately, it is my car.

secretsquirrel · 05-18-2011, 09:22 AM

Quote:

Originally Posted by Zeph

Fortunately, it is my car.

Way to stand up for your man rights.

I'm also in the market for a BOV or DV. Sigh, more money..

domrep · 05-18-2011, 10:21 AM

+1 on on synapse. no ricey whine.

Brey335i · 05-18-2011, 11:59 AM

BOV sounds better IMO, but the price is astronomical for a good setup with a charge pipe.

Syndicategt · 05-18-2011, 12:04 PM

Quote:

Originally Posted by Zeph

I love the sound of some BOV's, like the Synapse... I like them as long as they don't squeel! I also like getting rid of the hot air and not re-using it. My wife, on the other hand, liked it better when it was "quiet and tame". Fortunately, it is my car.

OMG I get into this argument every time she's in my car. "Your exhaust is too loud.....wah wah wah!" "Why would you do this to your car?"

I told her if I wanted a quite car I would have bought a Prius, silent under 5 mph

FYI, my exhaust isn't even loud.

PeteW84 · 05-18-2011, 08:14 PM

Quote:

Originally Posted by Zeph

I love the sound of some BOV's, like the Synapse... I like them as long as they don't squeel! I also like getting rid of the hot air and not re-using it. My wife, on the other hand, liked it better when it was "quiet and tame". Fortunately, it is my car.

The synapse sounds good, not too loud but definitely noticeable. Love mine, got the full synpse kit...

D335NUTZ · 05-18-2011, 08:56 PM

I got a Tial 50mm BoV for the sound. There's no performance difference between bov and dv.

Brey335i · 05-18-2011, 09:01 PM

Quote:

Originally Posted by Wilazn

I got a Tial 50mm BoV for the sound. There's no performance difference between bov and dv.

+ 1. Completely subjective

05-16-2011, 01:13 AM	#1
E90Vader Banned 47 Rep 631 Posts Drives: 2007 335i Join Date: Apr 2011 Location: Calgary iTrader: (0)	BOV Necessary? Just wondering if an aftermarket BOV is necessary for our cars? once COBB comes out with there stage 2 tune, the boost will be quite high! Will a BOV increase performance or help the car in any way? Or is it just a gimmick for sound? Not sure if the sound would even be noticeable on a Steptronic tranny?
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05-16-2011, 01:16 AM	#2
NiVeDh Major General 422 Rep 8,003 Posts Drives: '08 E90 335i, '99 E36 M3 Join Date: Apr 2009 Location: Houston, TX & Atlanta, GA iTrader: (132) Garage List 2008 BMW 335i Sedan [8.66]	You won't be able to hear it over your straight pipe exhaust anyway.
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05-16-2011, 01:19 AM	#3
JayKay335i Banned 189 Rep 5,046 Posts Drives: ///M323 DCT Join Date: Apr 2009 Location: North Dakota; its best DUHHHHHH iTrader: (1)	get diverter valves
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05-16-2011, 10:21 AM	#6
Syndicategt Brigadier General 153 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	Either a BOV or upgraded DV's will be able to hold higher levels of boost better than the stock DV's. But to answer your question, No, just adding a BOV will not increase power. You will hear it on the AT when you let off the gas pedal. __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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05-16-2011, 10:44 AM	#8
Willizm Captain 24 Rep 610 Posts Drives: 2009 335Xi and 01 Trans Am WS6 Join Date: Oct 2009 Location: Joliet, Il iTrader: (0)	Yep, got a Tial BOV for the sake of not having to worry about my weak DV's leaking. ETS didn't have an option for DV's or I would have probably gone that route. On an AT car the sound isn't noticeable unless you are purposely goosing it and letting off.
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05-16-2011, 08:35 PM	#9
E90Vader Banned 47 Rep 631 Posts Drives: 2007 335i Join Date: Apr 2011 Location: Calgary iTrader: (0)	Was not sure if the stock BOV was sufficient or if I really should look into a new BOV. Thanks for the info guys. I read somewhere that Charge pipes were not necessary.. People are starting to think they are needed as well!?
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05-17-2011, 12:14 AM	#11
Toker335i Captain 65 Rep 854 Posts Drives: 335i/Sold--10" GTR Join Date: Oct 2010 Location: Socal iTrader: (2)	I got a er charge pipe with hks bov and i love it! Get it! __________________ 10' Solid Red GTR 08' 335i 6MT - Sold 92' NA 300ZX 5speed - Sold 06 IS350 - Sold
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05-17-2011, 12:15 AM	#12
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	My stock charge pipe and DV's leaked a little... no problem after I upgraded
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05-17-2011, 07:59 PM	#13
E90Vader Banned 47 Rep 631 Posts Drives: 2007 335i Join Date: Apr 2011 Location: Calgary iTrader: (0)	Whats the difference between a diverter valve and a BOV? How much do Charge pipes cost + install?
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05-18-2011, 10:21 AM	#17
domrep Captain 42 Rep 993 Posts Drives: AW E93 335i Join Date: Mar 2009 Location: Toronto iTrader: (3)	+1 on on synapse. no ricey whine.
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05-18-2011, 11:59 AM	#18
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	BOV sounds better IMO, but the price is astronomical for a good setup with a charge pipe.
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05-18-2011, 08:56 PM	#21
D335NUTZ The Blue Beast 142 Rep 5,665 Posts Drives: 2008 E92 335xi in Montego Blue Join Date: Jan 2011 Location: Queens, New York iTrader: (8)	I got a Tial 50mm BoV for the sound. There's no performance difference between bov and dv. __________________ Cobb AP Stage 2+ \| BMS DCI \| UR Catless DP \| UR Chargepipe \| Tial BV 50mm \| BSH OCC \| ETS FMIC \| Eisenmann Race Exhaust \| KWv1 Coilovers \| Volk TE37 TC Kline Ed.
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