To BOV or not to BOV

bonsai · 11-02-2010, 01:03 PM

what do you guys think about BOV on our cars? i know the stock setup just recycles the air into the intake. is that an issue for tuned setups? does a BOV actually make any difference for tuned cars?

if it's just for the sounds, how do you all feel about the BOV sound?

i ask because i'm considering jumping on the JBSpeed deal the sponsored deals section of e90post.

1997gtx · 11-02-2010, 01:33 PM

A BOV vents air to the atmosphere, whereas a re-circulating valve re-circulates the air back into the system. The sound from the BOV comes from the air venting.

I can't speak to how the BMW's engine in setup, as I'm more familiar with the Audi. In the Audi, it's necessary to re-circulate the air.

Kroy · 11-02-2010, 01:49 PM

it's really just for the sound. it's your car, so you decide if you like the sound or not. performance-wise it's basically all the same.

16M4 · 11-02-2010, 01:51 PM

Quote:

Originally Posted by Kroy

it's your car, so you decide if you like the sound or not. performance-wise it's basically all the same.

Performance is the same? Stock DV's vs aftermarket bov's or DV's?

1997gtx · 11-02-2010, 02:21 PM

Diverter Valves (DV) are NOT the same as a BOV.

If you buy a BOV and get a recirculating kit, then all you've done is make a DV.

JayKay335i · 11-02-2010, 02:22 PM

Its just for sound. People going towards stage 3 setups may choose to put one on because it will hold more boost than the diaphragm stock DVs. But, you could just buy upgraded DVs. Also, some dont replace them until their stock DVs leak which happens on some and not on others. Personally, I dont want to draw any unnecessary attention to my car. I'd go aftermarket DVs and recirculate them.

1997gtx · 11-02-2010, 02:33 PM

Doesn't the BMW computer throw an engine code if it doesn't get recirculated air back like it's expecting?

Tee212 · 11-02-2010, 02:35 PM

The sound is too ricey this day in age. Even non turbo cars find a way to achieve such rice melody.

CasperSYTFU · 11-02-2010, 02:37 PM

Quote:

Originally Posted by 1997gtx

Doesn't the BMW computer throw an engine code if it doesn't get recirculated air back like it's expecting?

No, as the N54 isn't a MAF based engine. The N55 will though (or just run like shit).

Personally I would go this route FTW:

Bimmer84 · 11-02-2010, 02:45 PM

LOL. EPIC! I want to do it now.

timmahh · 11-02-2010, 03:26 PM

E90 DUCK!

SV Concepts III · 11-02-2010, 05:31 PM

I love the sound, I miss my AA BOV- it was intoxicating.

forza1976 · 11-02-2010, 05:34 PM

don't do it... stick with DV's. That sound is not meant for german autos!

McMuffin · 11-02-2010, 05:39 PM

Do it!!

kanecvl · 11-02-2010, 05:43 PM

DV's. They still make a lil bit of noise. Ultimately whatever you like

Bakeme521 · 11-02-2010, 06:11 PM

I'm thinking about picking up the z shift bov kit. Pretty cheap so I i don't like it no biggie.

turb0mik3 · 11-02-2010, 06:14 PM

Quote:

Originally Posted by Tee212

The sound is too ricey this day in age. Even non turbo cars find a way to achieve such rice melody.

It really depends on which BOV you get and the design with the spring rate. You can't just throw out BOVs from watching the Fast and the Furious movies. Mine has a very short and distinct "psh" noise, not like these annoying HKS that seem to last forever and can be heard from 5 miles away. I believe the BOV is slightly more efficient and holds the boost better. Recirculating the air, although it seems in principle to be ok, just seems like extra work that has to be done.

Tee212 · 11-02-2010, 06:16 PM

lol sure, defend your bov to the death

its your life!!!

McMuffin · 11-02-2010, 06:19 PM

Quote:

Originally Posted by Tee212

lol sure, defend your bov to the death

its your life!!!

Gavin@MMW · 11-02-2010, 06:36 PM

Quote:

Originally Posted by CasperSYTFU

No, as the N54 isn't a MAF based engine. The N55 will though (or just run like shit).

Personally I would go this route FTW:

LMFAO! Ive never seen this.. but hilarious

Penn999 · 11-02-2010, 08:48 PM

Quote:

Originally Posted by Mflowt5

It really depends on which BOV you get and the design with the spring rate. You can't just throw out BOVs from watching the Fast and the Furious movies. Mine has a very short and distinct "psh" noise, not like these annoying HKS that seem to last forever and can be heard from 5 miles away. I believe the BOV is slightly more efficient and holds the boost better. Recirculating the air, although it seems in principle to be ok, just seems like extra work that has to be done.

I agree, I have the AA bov and I have loved it from the day I put it in. You can really notice a difference in when the boost kicks in with a tune rather than running stock boost. It blows off (the woosh sound) a lot sooner and in lower rpms with the tune. I would say that its mostly about sound but I believe that if you plan on running much over 15psi I would get a BOV. If money isnt an issue for you call asr and get their intake and BOV package...thats what im doing in the next couple months.

BrianMN · 11-02-2010, 09:14 PM

The problem with the Stock DVs' isnt' that they can't hold high boost...on a single gear dyno pull or street pull, it will not fail. However, where the stock DV's fail is re-sealing in a timely manner upon releasing/shifting. So in that sense...aftermarket DV's or a BOV will yeild better driving performance.

11-02-2010, 01:03 PM	#1
bonsai OG 3er 84 Rep 295 Posts Drives: 2016 F80 M3/2018 F82 M4 Compet Join Date: Sep 2007 Location: San Francisco, CA. iTrader: (0)	To BOV or not to BOV what do you guys think about BOV on our cars? i know the stock setup just recycles the air into the intake. is that an issue for tuned setups? does a BOV actually make any difference for tuned cars? if it's just for the sounds, how do you all feel about the BOV sound? i ask because i'm considering jumping on the JBSpeed deal the sponsored deals section of e90post.
	Appreciate 0 Tweet Quote

11-02-2010, 01:33 PM	#2
1997gtx Lieutenant 10 Rep 530 Posts Drives: 08 328xi \| 08 S5 \| 02 S4 Join Date: Oct 2010 Location: CT iTrader: (0)	A BOV vents air to the atmosphere, whereas a re-circulating valve re-circulates the air back into the system. The sound from the BOV comes from the air venting. I can't speak to how the BMW's engine in setup, as I'm more familiar with the Audi. In the Audi, it's necessary to re-circulate the air. __________________ 08 328xi - SOLD \| 08 S5 \| 02 S4
	Appreciate 0 Quote

11-02-2010, 01:49 PM	#3
Kroy Brigadier General 173 Rep 3,032 Posts Drives: E90 Join Date: Jul 2009 Location: Los Angeles, CA iTrader: (1)	it's really just for the sound. it's your car, so you decide if you like the sound or not. performance-wise it's basically all the same.
	Appreciate 0 Quote

11-02-2010, 02:21 PM	#5
1997gtx Lieutenant 10 Rep 530 Posts Drives: 08 328xi \| 08 S5 \| 02 S4 Join Date: Oct 2010 Location: CT iTrader: (0)	Diverter Valves (DV) are NOT the same as a BOV. If you buy a BOV and get a recirculating kit, then all you've done is make a DV. __________________ 08 328xi - SOLD \| 08 S5 \| 02 S4
	Appreciate 0 Quote

11-02-2010, 02:22 PM	#6
JayKay335i Banned 189 Rep 5,046 Posts Drives: ///M323 DCT Join Date: Apr 2009 Location: North Dakota; its best DUHHHHHH iTrader: (1)	Its just for sound. People going towards stage 3 setups may choose to put one on because it will hold more boost than the diaphragm stock DVs. But, you could just buy upgraded DVs. Also, some dont replace them until their stock DVs leak which happens on some and not on others. Personally, I dont want to draw any unnecessary attention to my car. I'd go aftermarket DVs and recirculate them.
	Appreciate 0 Quote

11-02-2010, 02:33 PM	#7
1997gtx Lieutenant 10 Rep 530 Posts Drives: 08 328xi \| 08 S5 \| 02 S4 Join Date: Oct 2010 Location: CT iTrader: (0)	Doesn't the BMW computer throw an engine code if it doesn't get recirculated air back like it's expecting? __________________ 08 328xi - SOLD \| 08 S5 \| 02 S4
	Appreciate 0 Quote

11-02-2010, 02:35 PM	#8
Tee212 Banned 81 Rep 4,541 Posts Drives: yes Join Date: Oct 2008 Location: Riverside iTrader: (9) Garage List 2010 335 [8.00]	The sound is too ricey this day in age. Even non turbo cars find a way to achieve such rice melody.
	Appreciate 0 Quote

11-02-2010, 02:45 PM	#10
Bimmer84 Guardian of the Night 109 Rep 1,831 Posts Drives: 2010 335i M Sport Coupe Join Date: Oct 2010 Location: San Antonio iTrader: (5) Garage List 2010 335i E92 [7.50]	LOL. EPIC! I want to do it now. __________________ 2010 335i M Sport Coupe -- Black Sapphire Metallic\|Coral Red\|Loaded\|JB4 Stage 3\|BMS DCI\|VRSF DPs\|Camaross 6k AE\|Performance Gloss Black Grilles\|CF Performance Spoiler\|CF Quad Diffuser\|Double Layer Black Chrome Quad Tips\|CF Roundels\|Smoked Reflectors\|Red Cyba Scoops\|193s Painted Lamborghini Metallic Dark Gray
	Appreciate 0 Quote

11-02-2010, 03:26 PM	#11
timmahh ghey 483 Rep 2,041 Posts Drives: Viertürigen Fahrzeugs Join Date: Oct 2010 Location: Southern California iTrader: (1)	E90 DUCK! __________________ 21 G05 > 20 G05 > 17 G30 > 14 F30 > 08 E90
	Appreciate 0 Quote

11-02-2010, 05:31 PM	#12
SV Concepts III Lieutenant General 375 Rep 17,017 Posts Drives: BMW Duh Join Date: Apr 2005 Location: Santa Clara iTrader: (13)	I love the sound, I miss my AA BOV- it was intoxicating.
	Appreciate 0 Quote

11-02-2010, 05:34 PM	#13
forza1976 Major General 3398 Rep 6,589 Posts Drives: BMW Join Date: Aug 2007 Location: 49417 and 60610 iTrader: (13) Garage List 2022 BMW M3X [10.00]	don't do it... stick with DV's. That sound is not meant for german autos!
	Appreciate 0 Quote

11-02-2010, 05:39 PM	#14
McMuffin Lieutenant Colonel 104 Rep 1,549 Posts Drives: A Widebody 92 Join Date: Nov 2008 Location: Califas iTrader: (5)	Do it!! __________________ Embryo>e92
	Appreciate 0 Quote

11-02-2010, 05:43 PM	#15
kanecvl Lieutenant 22 Rep 586 Posts Drives: 15 535d Join Date: Aug 2009 Location: NC iTrader: (6)	DV's. They still make a lil bit of noise. Ultimately whatever you like __________________
	Appreciate 0 Quote

11-02-2010, 06:11 PM	#16
Bakeme521 Some say... 239 Rep 4,296 Posts Drives: Fresh Join Date: Mar 2010 Location: Baton Rouge n NOLA iTrader: (12) Garage List 2007 BMW 335i [8.24]	I'm thinking about picking up the z shift bov kit. Pretty cheap so I i don't like it no biggie. __________________ I have exhaust and an intake...
	Appreciate 0 Quote

11-02-2010, 06:16 PM	#18
Tee212 Banned 81 Rep 4,541 Posts Drives: yes Join Date: Oct 2008 Location: Riverside iTrader: (9) Garage List 2010 335 [8.00]	lol sure, defend your bov to the death its your life!!!
	Appreciate 0 Quote

11-02-2010, 09:14 PM	#22
BrianMN Banned 114 Rep 2,428 Posts Drives: 4 Door Family Sedan Join Date: Sep 2009 Location: Minneapolis iTrader: (7)	The problem with the Stock DVs' isnt' that they can't hold high boost...on a single gear dyno pull or street pull, it will not fail. However, where the stock DV's fail is re-sealing in a timely manner upon releasing/shifting. So in that sense...aftermarket DV's or a BOV will yeild better driving performance.
	Appreciate 0 Quote