Where would you put your BOV? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*NemeGuero* · 11-09-2006, 03:30 PM

Ok, so the dealio is I've heard various things about the best location for a BOV. Basically I'll break it down into:

1. on the cold pipe just before the TB
and

2. immediately after the compressor on the charged pipe

1 gives the best throttle response (or so I've heard) but blows off quite frequently

and 2 is best for turbo life and easiest in the event of recirculation.

So I ask upon you, my fellow zilvians, to give me your input/opinions/rude comments/flame/jealousy/newbish stupidity or any of the other things that makes zilvia great...

Also, please consider this is a MAFS setup.. not MAP. If you don't understand why that matters.. ignore it.

You may proceed.
<3 Nemo.

SoSideways · 11-09-2006, 03:36 PM

I will let you know how often the BOV opens once I relocate mine to the elbow right after the FMIC.

Loud and annoying coming right up!!

<3 Neme

*NemeGuero* · 11-09-2006, 04:17 PM

All these opinions without explanations? hmm...

EchoOfSilence · 11-09-2006, 04:26 PM

throttle responsssssse and recirc it. haha!

*Sil-Abc* · 11-09-2006, 04:39 PM

what is this... BOV?

g6civcx · 11-09-2006, 05:16 PM

Cold pipe, convert to MAP, and vent to atmosphere.

*NemeGuero* · 11-09-2006, 09:34 PM

Wish I could afford to convert to MAP.

TAMTANIUM · 11-09-2006, 09:55 PM

If it was my decision to put a bov on my car...
It would be on the cold pipe right after the throttle plate.
You will get a nicer response from the bov.
My friend put his bov there and it's a little better response.
Compare to my bov on the hot pipe, it's like whatever. By mean
sucky bov response...that i can still hear my waste gate.

EJ253 · 11-09-2006, 10:59 PM

cold pipe. recirc it.

SoSideways · 11-10-2006, 07:38 AM

So everyone who posted in the thread supported all the votes for the BOV being on the cold pipe right by the throttle body, but where are all those people who suggested the BOV be placed on the hot pipe? Where are their explanations as to why they chose that side?

smelly240 · 11-10-2006, 03:58 PM

i figure closest you can get it to the throttle body the better. The pressure in the pipe is jacked up because the throttle plate closed - so i imagine the pressure begins to increase there first, - plus it should be more responsive there - due to it having the earliest and largest pressure difference

supra guys have those super long TB's they weld a flange right to em - where the traction flapper thing is.

*drift freaq* · 11-10-2006, 05:02 PM

well for recirculation factor mine is on the hot pipe by the compressor. Why because RB's do not run for shit vented to the atmosphere. I also happen to believe in recirculating the blowoff to cut down on the amount of crap my car could possibly be putting out into the air. Thats me and some of you wil just why does it matter man. Well if you even have to ask that question you need to take a look at the world around you. hahahhahha.

yfz460 · 11-10-2006, 05:14 PM

Screw putting it on the piping... put it right on the intake manifold!

LoL.... but seriously, I say put it on the cold pipe, better throttle response is a must (imo...) for a turbo'd car on the street or track, especially if you're running a larger, laggier setup.

*drift freaq* · 11-10-2006, 05:20 PM

Quote:

Originally Posted by yfz460

Screw putting it on the piping... put it right on the intake manifold!

LoL.... but seriously, I say put it on the cold pipe, better throttle response is a must (imo...) for a turbo'd car on the street or track, especially if you're running a larger, laggier setup.

Throttle response? hehehehhe With RB and HKS GT2535 we don't need to worry about no stinkin throttle response. hahhahahhahhahhahha

yfz460 · 11-10-2006, 05:34 PM

Not all of us are so fortunate to be able to afford a beautifull piece of Japanese engineering freaq...

Oh, and I ran my BOV on my deceased car on my hotpipe vented to the atmosphere. It was the new version of the HKS SSQV (no adjustment on the back, and was authentic) and I had no problems with it stalling but it would sometimes go down to about a 100-200rpm idle for a second or two after pushing the engine.

*NemeGuero* · 11-10-2006, 07:52 PM

I'm using the new SSQV too.. Courtesy of Ernest! (SoSideways)
But it seems mine will be on the cold pipe.. and quite possible have a huge tube going across the bay for recircing..

yfz460 · 11-10-2006, 08:07 PM

I'm not 100% sure how well it works, or how it works, but HKS makes (or made) a unit called the EIDS (electronic idle stabilizer) to aid in the idling of atmospheric bov systems on MAF cars. HKS claims it "buffers" signals from it which it could possibly do, I'm no electronic genius like those crazy HKS guys so I have no input on that one.

http://www.hksusa.com/products/?id=2175

^^ Info on the unit.

*NemeGuero* · 11-10-2006, 08:13 PM

Hmm.. cool link. Anyone tried these or have any more info on them?

*punxva* · 11-10-2006, 08:22 PM

u could also use an SAFC and use the decel air setting

***S14DB*** · 11-11-2006, 10:32 AM

Or just trash the BunkiROM and get an AEM EMS and convert to IAT+MAP.

But really there is a reason the s14SR moved the BOV to were it did. The Pressure wave that causes compressor surge starts at the TB. Most of the charged air is in the IC. Dumping it in the hot pipe causes the air to back flow. 1, loosing response and 2, the possibility of BOV induced surge.

Cold pipe is the only was to go.

*NemeGuero* · 11-11-2006, 01:47 PM

Yay, finally some factual evidence to base opinions off of.
Thanks AJ.

And If you'd sell me your EMS for $500.. I'd do it. HAHA

***S14DB*** · 11-11-2006, 02:49 PM

Sold it a month ago and my Power FC is on it's way.

SoSideways · 11-11-2006, 03:03 PM

Yeah my friend Brian who was stationed over in Japan for a long time and said he built a lot of S-chassis, also said something along the lines of what S14DB said.

Basically he said that the charged air is in the IC and cold pipe when you close the throttle plate, so it would make sense to put the BOV there to vent the air there to prevent it from going back into the compressor, where the initial compressed air from the compressor is still making its way out of the compressor outlet to the IC and cold pipe side.

*NemeGuero* · 11-11-2006, 10:51 PM

cool. So I guess that's where I'm putting it..

Recirc will depend on what my AFRs look like..

g6civcx · 11-12-2006, 07:25 AM

The S13 puts the compress bypass valve on the cold pipe of the sidemount. You can see it capped off below.

I moved it into the engine bay to keep it clean and for easier recirculating. Look how dirty the sidemount is.

The S14 moves it even further up the coldpipe. I think that's the right thing to do. Just make sure you route your hoses correctly.

Oh, and the pink slippers are not mine. I swear!

SoSideways · 11-13-2006, 03:58 PM

You know, now that you've brought that up g6civcx, the Skyline GT-Rs also have their recirc valves on the cold pipe, right in front of where the JDM driver's side front wheel is.

So it's settled, for performance's sake, BOVs should go on the cold pipe, as close to the TB as you can get it (although I've heard 6" from TB is the best spot for it?)

*NemeGuero* · 11-14-2006, 12:06 AM

Well I'll give it a few inches for hood clearance issues..

blu808 · 11-14-2006, 01:02 AM

Evan. Unless you are making hella hp, i would put it on the hot pipe. I would put it there because on a lower cfm car it is better to release the pressure before the intercooler, that way the ic can keep some pressure in it.

You dont want to drain all the pressure in your fmic then have to refill it before you feel the boost kick in. Yes i know even on the hot pipe it will drain the fmic, but not as bad as on the cold side.

Like my sig \/ haha

A-Tech_Weapons · 11-14-2006, 06:27 AM

Just to let everybody know, Wastegates make a PSSSHH noise too! >=D

Neejay · 11-14-2006, 11:07 AM

Quote:

Originally Posted by g6civcx

The S13 puts the compress bypass valve on the cold pipe of the sidemount. You can see it capped off below.

I moved it into the engine bay to keep it clean and for easier recirculating. Look how dirty the sidemount is.

The S14 moves it even further up the coldpipe. I think that's the right thing to do. Just make sure you route your hoses correctly.

....

Oh, and the pink slippers are not mine. I swear!

That is a very good point. I'd never thought about or noticed that. Would this also apply to a aftermarket fmic? Because blu808 brings up a valid point as well...

PS: Those flip-flops/slippers are yours and you know it!

View Poll Results: Where would you mount your blow off valve?
On the cold pipe, near to the throttle body	42	61.76%
On the charged pipe, nearest the compressor	20	29.41%
what is a BOV?	6	8.82%
Voters: 68. You may not vote on this poll

11-09-2006, 03:30 PM	#1
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 28 Posts: 8,257 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	Where would you put your BOV? Ok, so the dealio is I've heard various things about the best location for a BOV. Basically I'll break it down into: 1. on the cold pipe just before the TB and 2. immediately after the compressor on the charged pipe 1 gives the best throttle response (or so I've heard) but blows off quite frequently and 2 is best for turbo life and easiest in the event of recirculation. So I ask upon you, my fellow zilvians, to give me your input/opinions/rude comments/flame/jealousy/newbish stupidity or any of the other things that makes zilvia great... Also, please consider this is a MAFS setup.. not MAP. If you don't understand why that matters.. ignore it. You may proceed. <3 Nemo. __________________

11-09-2006, 03:36 PM	#2
SoSideways Post Whore! Join Date: Apr 2003 Location: 你老母 Posts: 4,386 Trader Rating: (4) Feedback Score: 4 reviews	I will let you know how often the BOV opens once I relocate mine to the elbow right after the FMIC. Loud and annoying coming right up!! <3 Neme __________________ SoSideway's iTrader Rating!! *SoSideways' Review Thread!!* http://sosideways.wordpress.com/

11-09-2006, 04:17 PM	#3
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 28 Posts: 8,257 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	All these opinions without explanations? hmm... __________________

11-09-2006, 04:39 PM	#5
Sil-Abc You're A Towel!! Join Date: Jul 2003 Location: Bayarea Age: 27 Posts: 2,551 Trader Rating: (13) Rides Gallery: Sil-Abc Feedback Score: 13 reviews	what is this... BOV? __________________ IM JON WAYNE ESQ.... bitch

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11-09-2006, 04:26 PM	#4
EchoOfSilence Nissanaholic! Join Date: Aug 2003 Location: Los Angeles/Berkeley, CA Posts: 2,235 Trader Rating: (1) Feedback Score: 1 reviews	throttle responsssssse and recirc it. haha!

11-09-2006, 05:16 PM	#6
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,767 Trader Rating: (5) Feedback Score: 5 reviews	Cold pipe, convert to MAP, and vent to atmosphere.

11-09-2006, 09:34 PM	#7
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 28 Posts: 8,257 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	Wish I could afford to convert to MAP. __________________

11-09-2006, 09:55 PM	#8
TAMTANIUM Zilvia FREAK! Join Date: Apr 2005 Location: Socal. wc Age: 26 Posts: 1,023 Trader Rating: (1) Feedback Score: 1 reviews	If it was my decision to put a bov on my car... It would be on the cold pipe right after the throttle plate. You will get a nicer response from the bov. My friend put his bov there and it's a little better response. Compare to my bov on the hot pipe, it's like whatever. By mean sucky bov response...that i can still hear my waste gate.

11-09-2006, 10:59 PM	#9
EJ253 Zilvia FREAK! Join Date: Oct 2006 Location: Salt Lake City Age: 24 Posts: 1,155 Trader Rating: (0) Rides Gallery: EJ253 Feedback Score: 0 reviews	cold pipe. recirc it.

11-10-2006, 07:38 AM	#10
SoSideways Post Whore! Join Date: Apr 2003 Location: 你老母 Posts: 4,386 Trader Rating: (4) Feedback Score: 4 reviews	So everyone who posted in the thread supported all the votes for the BOV being on the cold pipe right by the throttle body, but where are all those people who suggested the BOV be placed on the hot pipe? Where are their explanations as to why they chose that side? __________________ SoSideway's iTrader Rating!! *SoSideways' Review Thread!!* http://sosideways.wordpress.com/

11-10-2006, 03:58 PM	#11
smelly240 Nissanaholic! Join Date: Oct 2006 Location: Philaburbia Age: 35 Posts: 2,181 Trader Rating: (4) Feedback Score: 4 reviews	i figure closest you can get it to the throttle body the better. The pressure in the pipe is jacked up because the throttle plate closed - so i imagine the pressure begins to increase there first, - plus it should be more responsive there - due to it having the earliest and largest pressure difference supra guys have those super long TB's they weld a flange right to em - where the traction flapper thing is.

11-10-2006, 07:52 PM	#16
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 28 Posts: 8,257 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	I'm using the new SSQV too.. Courtesy of Ernest! (SoSideways) But it seems mine will be on the cold pipe.. and quite possible have a huge tube going across the bay for recircing.. __________________

11-10-2006, 08:13 PM	#18
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 28 Posts: 8,257 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	Hmm.. cool link. Anyone tried these or have any more info on them? __________________

11-11-2006, 10:32 AM	#20
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 18,697 Trader Rating: (2) Feedback Score: 2 reviews	Or just trash the BunkiROM and get an AEM EMS and convert to IAT+MAP. But really there is a reason the s14SR moved the BOV to were it did. The Pressure wave that causes compressor surge starts at the TB. Most of the charged air is in the IC. Dumping it in the hot pipe causes the air to back flow. 1, loosing response and 2, the possibility of BOV induced surge. Cold pipe is the only was to go. __________________ Comments should be taken as Opinions not as Statements of Fact.

11-11-2006, 01:47 PM	#21
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 28 Posts: 8,257 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	Yay, finally some factual evidence to base opinions off of. Thanks AJ. And If you'd sell me your EMS for $500.. I'd do it. HAHA __________________

11-11-2006, 02:49 PM	#22
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 18,697 Trader Rating: (2) Feedback Score: 2 reviews	Sold it a month ago and my Power FC is on it's way. __________________ Comments should be taken as Opinions not as Statements of Fact.

11-11-2006, 03:03 PM	#23
SoSideways Post Whore! Join Date: Apr 2003 Location: 你老母 Posts: 4,386 Trader Rating: (4) Feedback Score: 4 reviews	Yeah my friend Brian who was stationed over in Japan for a long time and said he built a lot of S-chassis, also said something along the lines of what S14DB said. Basically he said that the charged air is in the IC and cold pipe when you close the throttle plate, so it would make sense to put the BOV there to vent the air there to prevent it from going back into the compressor, where the initial compressed air from the compressor is still making its way out of the compressor outlet to the IC and cold pipe side. __________________ SoSideway's iTrader Rating!! *SoSideways' Review Thread!!* http://sosideways.wordpress.com/

11-11-2006, 10:51 PM	#24
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 28 Posts: 8,257 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	cool. So I guess that's where I'm putting it.. Recirc will depend on what my AFRs look like.. __________________

11-12-2006, 07:25 AM	#25
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,767 Trader Rating: (5) Feedback Score: 5 reviews	The S13 puts the compress bypass valve on the cold pipe of the sidemount. You can see it capped off below. I moved it into the engine bay to keep it clean and for easier recirculating. Look how dirty the sidemount is. The S14 moves it even further up the coldpipe. I think that's the right thing to do. Just make sure you route your hoses correctly. Oh, and the pink slippers are not mine. I swear!

11-13-2006, 03:58 PM	#26
SoSideways Post Whore! Join Date: Apr 2003 Location: 你老母 Posts: 4,386 Trader Rating: (4) Feedback Score: 4 reviews	You know, now that you've brought that up g6civcx, the Skyline GT-Rs also have their recirc valves on the cold pipe, right in front of where the JDM driver's side front wheel is. So it's settled, for performance's sake, BOVs should go on the cold pipe, as close to the TB as you can get it (although I've heard 6" from TB is the best spot for it?) __________________ SoSideway's iTrader Rating!! *SoSideways' Review Thread!!* http://sosideways.wordpress.com/

11-14-2006, 12:06 AM	#27
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 28 Posts: 8,257 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	Well I'll give it a few inches for hood clearance issues.. __________________

11-14-2006, 01:02 AM	#28
blu808 Post Whore! Join Date: Dec 2002 Location: Campbell, Ca Age: 30 Posts: 4,978 Trader Rating: (3) Feedback Score: 3 reviews	Evan. Unless you are making hella hp, i would put it on the hot pipe. I would put it there because on a lower cfm car it is better to release the pressure before the intercooler, that way the ic can keep some pressure in it. You dont want to drain all the pressure in your fmic then have to refill it before you feel the boost kick in. Yes i know even on the hot pipe it will drain the fmic, but not as bad as on the cold side. Like my sig \/ haha __________________

11-14-2006, 06:27 AM	#29
A-Tech_Weapons Banned from the Marketplace Join Date: Oct 2006 Location: Bellingham, WA Age: 25 Posts: 479 Trader Rating: (0) Feedback Score: 0 reviews	Just to let everybody know, Wastegates make a PSSSHH noise too! >=D

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