BOV, negative performance impact?

///M3THOD · 05-27-2011, 10:15 PM

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.

Forcefed3 · 05-27-2011, 10:18 PM

We dont have a MAF sensor. Who ever wrote that needs to reassess their statement. You will be fine.

///M3THOD · 05-27-2011, 10:27 PM

Quote:

Originally Posted by gbreeE90

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.

Forcefed3 · 05-27-2011, 10:31 PM

Quote:

Originally Posted by ///M3THOD

Straight off Vishnu's website.

Excellent then, BOV it is. Thanks for your reply.

Maybe they were talking about the N55. No problem.

Brey335i · 05-27-2011, 11:11 PM

Yeah I've read that too a while back... straight up ignore it

Tzu · 05-28-2011, 12:26 AM

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.

NiVeDh · 05-28-2011, 12:31 AM

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.

Forcefed3 · 05-28-2011, 12:33 AM

Quote:

Originally Posted by Tzu

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.

tibra1 · 05-28-2011, 12:34 AM

Quote:

Originally Posted by ///M3THOD

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

Forcefed3 · 05-28-2011, 12:35 AM

Quote:

Originally Posted by tibra1

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.

tibra1 · 05-28-2011, 01:30 AM

And the performance advantages of BOVs are what exactly?

Forcefed3 · 05-28-2011, 01:34 AM

Quote:

Originally Posted by tibra1

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.

tibra1 · 05-28-2011, 01:40 AM

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

Tim@EMSTUNING · 05-28-2011, 04:35 AM

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.

**335i** · 05-28-2011, 07:31 AM

Quote:

Originally Posted by tibra1

And the performance advantages of BOVs are what exactly?

only sound

forza1976 · 05-28-2011, 07:36 AM

Bov = boy racer wet dreams.

TheKuz · 05-28-2011, 10:05 AM

NiVeDh..I love your suspension...what are you running?

Forcefed3 · 05-28-2011, 10:24 AM

Quote:

Originally Posted by TheKuz

NiVeDh..I love your suspension...what are you running?

Tzu · 05-28-2011, 12:25 PM

Quote:

Originally Posted by gbreeE90

Thats not how it works.

Elaborate?

NiVeDh · 05-28-2011, 01:13 PM

Quote:

Originally Posted by TheKuz

NiVeDh..I love your suspension...what are you running?

Bilstein PSS9.

Forcefed3 · 05-28-2011, 06:51 PM

Quote:

Originally Posted by Tzu

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.

Tzu · 05-28-2011, 08:16 PM

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.

05-27-2011, 10:15 PM	#1
///M3THOD Lieutenant Colonel 117 Rep 1,625 Posts Drives: 991.2 GTS Join Date: Dec 2009 Location: ATL iTrader: (30)	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. __________________ 2014 Individual /// M5 Competition AW/AB \|\| Vorsteiner FF-103 \|\| BMS JB4 \|\| Meisterschaft GTC \|\| RPI \|\| IND \|\| Challenge \|\|
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05-27-2011, 10:18 PM	#2
Forcefed3 Banned 127 Rep 4,732 Posts Drives: 2008 335i Join Date: May 2010 Location: South iTrader: (2) Garage List 2008 335i [1.00]	We dont have a MAF sensor. Who ever wrote that needs to reassess their statement. You will be fine.
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05-27-2011, 11:11 PM	#5
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	Yeah I've read that too a while back... straight up ignore it
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05-28-2011, 12:26 AM	#6
Tzu Lieutenant Colonel 29 Rep 1,551 Posts Drives: 335i Join Date: Jun 2010 Location: Toronto 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.
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05-28-2011, 12:31 AM	#7
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]	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.
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05-28-2011, 01:30 AM	#11
tibra1 Banned 127 Rep 6,773 Posts Drives: 2011 ZCP M3 - 2007 335i crashd Join Date: Apr 2009 Location: NYC iTrader: (4)	And the performance advantages of BOVs are what exactly?
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05-28-2011, 01:40 AM	#13
tibra1 Banned 127 Rep 6,773 Posts Drives: 2011 ZCP M3 - 2007 335i crashd Join Date: Apr 2009 Location: NYC 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
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05-28-2011, 04:35 AM	#14
Tim@EMSTUNING 0 Rep 15 Posts Drives: A BMW on Boost.... ;) Join Date: May 2011 Location: Miami 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.
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05-28-2011, 07:36 AM	#16
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]	Bov = boy racer wet dreams.
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05-28-2011, 10:05 AM	#17
TheKuz Private 6 Rep 79 Posts Drives: 2007 BMW 335i Join Date: May 2011 Location: Charlotte, NC iTrader: (0)	NiVeDh..I love your suspension...what are you running?
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05-28-2011, 08:16 PM	#22
Tzu Lieutenant Colonel 29 Rep 1,551 Posts Drives: 335i Join Date: Jun 2010 Location: Toronto 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.
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