For the Love of Nissan Just recirculate the Bov

[jmac636]

For people that don't know:

Vented to atmosphere is not a good option for nissan tunes.
you will have running issues that can be easily remedied by a simple recirc hose.
believe me, i went vta at first and never again on the altima. reliability is on par with a non turbo setup, has great blow off sound still and runs like a champ - 11lbs all day long.
recirc it, youll be stubborn about it at first, but its the right thing to do and youll be much happier in the end.

this is stickied somewhere but here it is again.

From: "Ben Pila" <[email protected]>

To: <[email protected]>

Subject: Re: BOV Setup Information

Date: Mon 10/29/07 05:42 PM

At 05:35 PM 10/26/2007, you wrote:
Hey Ben, one more question I should have asked before... Is the JWT
tune designed with venting to atmosphere in mind or with
recirculation in mind? I currently have mine venting to atmosphere,
but Im hearing that I might have idle issues with that setup.
Thanks
Jay

Hi Jay,
The Nissan control system was not designed to run a BOV to
atmosphere. There is no way to make the ECU work with this as the
amount of air flow in the system that is lost if an atmospheric BOV
opens is an unknown amount to the ECU. Once the air flow comes
across the MAF sensor, the ECU expects all that air to be in the
system and adds the fuel based on this amount. So if you do not want
to have the stalling when coming to a fast stop and/or the rich
conditions between shifts, we recommend you run a recirculation type
valve (also known as a compressor bypass valve). It might be
possible to convert your existing valve to the proper type. Check
with the company that made your BOV for this. Note that the air flow
when recirculated, should dump back to the inlet side of the turbo
and ideally aim at the compressor wheel in the turbo inlet. This
also helps keep the turbo more responsive between shifts.

Best regards,
Ben Pila (Technical and Sales Support)
Jim Wolf Technology, Inc.
212 Millar Ave
El Cajon, CA 92020-4219
(619) 442-0680 Mon-Fri 8am-5pm PST
(619) 579-8160 24 hour fax
JIM WOLF TECHNOLOGY, INC. / NISSAN PERFORMANCE / NISSAN RACING /INFINITI PERFORMANCE (http://www.jimwolftechnology.com/)

[murda-c]

I don't need a bov cuz my belts screech when i shift at 6.5k so everyone at school thinks i'm turbo.

[s13 @ fullboost]

Wow reminds me of the DSM forums

[slider2828]

He wants that Ricey PPPOOOOOOOSSSSSSSSHHHHHHHHHHHHHHhhhhhhhhhh. what can we say....

[allntrlundrgrnd]

if you buy me the hks recirc adapter i will :love:

[rc1honda]

He wants that Ricey PPPOOOOOOOSSSSSSSSHHHHHHHHHHHHHHhhhhhhhhhh. what can we say....

QFT the sound is priceless. I think a lot of people beat the shit out of thier cars here and i don't really think a BOV will break something faster then driving the cars like we stole em.

[rps13sr20det]

in the long term...I won't see this making a difference :)

[ZX88]

i just put the jdm tyte kazoo adapter on my greddy. problem solved./

[HyperTek]

blow thru maf before the throttle body ftw.. vent ur bov all day every day

[Dutchmalmiss]

If I ran atmospheric, I'd make it blow bubbles everytime I shift.

[Flipzide]

my s14 that i bought for track use came with an atmospheric setup and i'm too lazy to recirculate it :-P

[allntrlundrgrnd]

lol my friend taped a duck call on his sr for shits and giggles

[LongGrain]

my car runs like a top with vta. i dont see any point in recircing it.

[WISH ONE]

there isnt no point to this thread.. this is all you will ever need.
http://i20.photobucket.com/albums/b243/mikeishellafresh/recircdraw.jpg

[MetricHotrods.com]

blow off valve? whats that? i just let it slam into the turbine at 1.2 bar. no, really. bov just leak boost and flutter. fuck em.

[YoungGun]

I have idle issues, but it sounds like my sr is cammed.

At stoplight

Mustang guy "That thing is pretty fast is it cammed?"

Me "No."

OMGLAWL

[bejota180sx]

blow thru maf before the throttle body ftw.. vent ur bov all day every day
aren't our mafs designed for draw-thru?? and using them for blowthru damages them? at least thats what ive read and heard from people who used to own blow-thru with z32 mafs...

[HyperTek]

worked out great when i had my sr20
http://a633.ac-images.myspacecdn.com/images01/39/l_65921e5f551b797af4b43903bdad6208.jpg

[bejota180sx]

how did you run it like that? cause i want a blow-thru i just dont want to be burning up mafs regularly since z32 mafs are really hard to come by in PR and waiting for someone to post one up and hope its working fine is kinda shitty

[BoostedCoupe]

blow off valve? whats that? i just let it slam into the turbine at 1.2 bar. no, really. bov just leak boost and flutter. fuck em.
Im with this guy. I know alot of people on this forum dont run blow off valves either. To me aslong as you dont hit full boost than let off to let it surge over and over everyday than it wont hurt. Its those people that Hit boost in first gear in the middle of town just to let it surge that fucks their turbo's up.

[MetricHotrods.com]

most of the SR guys here just replace that one pipe you guys all attach the BOV to with a solid pipe, the upswept one on the side of the motor. sorry im not too SR savvy.

[allntrlundrgrnd]

i guess nissan and every other car manufacturer installed bypass valves for no reason?

get a clue

[96Turbo]

i guess nissan and every other car manufacturer installed bypass valves for no reason?

get a clue

tru dat

OEM manufacturers do their research....and if a BPV wasn't necessary then you bet your ass they'd ditch it to save a couple bucks on every unit

[jskateborders]

get an hks ssqv. Never have to worry about running atmospheric/stalling.

[96Turbo]

get an hks ssqv. Never have to worry about running atmospheric/stalling.

why? It's still just an atmospheric bov...

[ericcastro]

So no blow off,
but counter the anti rice effects of this by getting a electric blow off noise thing from pep boys??

[raz0rbladez909]

get an hks ssqv. Never have to worry about running atmospheric/stalling.

only if you get the recirc fitting, if not it's still going to stall no matter how minimal it is.

[LongGrain]

with the idle air hooked up you shouldnt have any trouble with stalling. my BOV has been vta since day 1 and the only time i ever had an issue was before i had the idle air tube hooked up.

now i have never once had an issue. runs like a dream.

[DisEpyon]

with the idle air hooked up you shouldnt have any trouble with stalling. my BOV has been vta since day 1 and the only time i ever had an issue was before i had the idle air tube hooked up.

now i have never once had an issue. runs like a dream.

im running a vta bov too, the only issue im having is that when coming to a stop my engine will start to bog down almost like the ecu wants to kill the motor, but then the engine will start to make its way to idle point, like mentioned above in the op email.

This idle air tube you are talking about, where is it located? (on the throttle body?) where does it hook up to? maybe this may solve my problem.

[LongGrain]

its a big tube, like maybe 1" or so, its on the TB i think, or maybe just the intake. i dont have my car here to look at it. but there should be a hose going from that to your cold pipe.

heres a pic of my motor, you can see the tube, just not really where it goes.

http://i34.photobucket.com/albums/d123/LongGrain/SR.jpg

[DisEpyon]

ahhh... i know that tube, it hooks to the iacv underneath the manifold (if you have a greddy). didnt really know the name of it. I see that your bov is on your hot pipe; whereas, mine is on my cold pipe, so that may be the reason im having idle issues when coming to a stop. The bov is probably letting out alot of air before the throttle body when shifting into neutral position. I have not other issues, the engine runs very strong.

http://i106.photobucket.com/albums/m271/disepyon/IMG_2042.jpg

[Sileighty_85]

Greddy Type R FTW. Ive never had a problem with mine.

I did notice somthing though, I recently had a S14 T28 on mine just upgraded to a GT2871R.

Now with my BOV and running the T28 I had to have the the BOV tightened about half way to prevent the idle drop. Drove fine never had an issue with idle

When I installed the GT2871R Im able to loosen the BOV so it opens softer.

My Version

the 2871R (or bigger) can push enough air at idle to where it wont affect idle at transfer to Neutral, but the T25/28's cannot push enough air to keep idle stablized at Neutral Revs and Neutral transfer.

I have noticed a trend of ppl complaining about Ide drops and the majority of these ppl only run T-25/T28's

So i dont think its a matter of the ECU not being able to handle a Atmos. BOV its that the Stock turbos cannot push enough air to keep the systems AFR's stabliized when vented.

Kinda like when you pull off a vacuum line when the engine is running.

So i think its only a problem with stock turbos

[jmac636]

Sileighty 85, You bring up a good point. I like your theory and I think you're right. I installed an sr t25 on my KA and I have a greddy rs bov. I have adjusted it open atmosphere extensively. When I recirculated the bov my stalling and backfiring went away and my bov can still be heard loud and clear. It's the cat's meow for people with smaller turbo's on the KA. I wondered why some Sr's have a problem open atmosphere and some don't. My buddy is running open atmos bov with sr20det w/upgraded t25 and has no problems.There are definately benefits to recirculation. Plugs last longer due to not running rich when coming off boost. I wanted open atmosphere, so I tried that first then I had slight problems so I had an intake fabbed for recirculation and now I'm finally content.

[yokotavia]

i dont see a reason to running a BOV, ive ran no bov on my t28 for over a year at 1.1bar and it still pulls strong. never going to spend money on a bov, just gives you idle problems and makes lame sounds.

when cramming 1.1bar of boost into your t28 makes a WAY cooler sound than a 250$ hks ssq.

LOL

just my 2 cents; no need for a bov when using a oem turbine.

[SoSideways]

i dont see a reason to running a BOV, ive ran no bov on my t28 for over a year at 1.1bar and it still pulls strong. never going to spend money on a bov, just gives you idle problems and makes lame sounds.

when cramming 1.1bar of boost into your t28 makes a WAY cooler sound than a 250$ hks ssq.

LOL

just my 2 cents; no need for a bov when using a oem turbine.

Are you going on/off throttle on that turbine in a drift type situation at least 3 times a month?

[xplicit240]

the japanese dont really like BOV's. lol

yeah the point argued when not running a bov is that the turbo will die out. i dont think so.

the greddy EP3 street challenge car ran with no bov. and the turbo had no problems. i would know =)

and the response was great. there was barely any lag at all.

[Nduggs]

I have had a Greddy RS and HKS SSQV on an sr redtop. Both vented no problems.

[JeremyR]

i've got a hks ssqv. ran it vta for about a year. car would run super rich between shifts. got a recirc fitting and tied it to dump back between the maf and turbo. no more rich condition.

better to be safe than sorry.
and with something you invest alot of moeny and time into, it only makes sense to try and protect it. seriously. if it wasnt needed, than they wouldnt of came with them from the factory.

[bkfill]

i agree recirculate is the way to go no bogging no nothing just runs normal

[holybushoffire]

I run an HKS SSQV, and after I had my IACV hooked up properly I haven't had a single idle/stalling problem like LongGrain.

I used to run extremely rich between shifting and I had slight idle problems at first. After I got my AFC and hooked up my IACV my wideband read properly all the time.

I honestly don't see the problem with running VTA for these engines.

[niSm095]

SR + 2871r + TiAL50mm BOV + Correct spring for BOV + EnthalpyTune = no problems at all with idle or running issues. VTA FTW.

[usdm180sx]

I have the new HKS ssqv. My car only stalls .000000001% of the time

[allntrlundrgrnd]

can we let this thread die please

[aNskY]

Greddy Type R FTW. Ive never had a problem with mine.

I did notice somthing though, I recently had a S14 T28 on mine just upgraded to a GT2871R.

Now with my BOV and running the T28 I had to have the the BOV tightened about half way to prevent the idle drop. Drove fine never had an issue with idle

When I installed the GT2871R Im able to loosen the BOV so it opens softer.

My Version

the 2871R (or bigger) can push enough air at idle to where it wont affect idle at transfer to Neutral, but the T25/28's cannot push enough air to keep idle stablized at Neutral Revs and Neutral transfer.

I have noticed a trend of ppl complaining about Ide drops and the majority of these ppl only run T-25/T28's

So i dont think its a matter of the ECU not being able to handle a Atmos. BOV its that the Stock turbos cannot push enough air to keep the systems AFR's stabliized when vented.

Kinda like when you pull off a vacuum line when the engine is running.

So i think its only a problem with stock turbos

lol

Sileighty 85, You bring up a good point. I like your theory and I think you're right. I installed an sr t25 on my KA and I have a greddy rs bov. I have adjusted it open atmosphere extensively. When I recirculated the bov my stalling and backfiring went away and my bov can still be heard loud and clear. It's the cat's meow for people with smaller turbo's on the KA. I wondered why some Sr's have a problem open atmosphere and some don't. My buddy is running open atmos bov with sr20det w/upgraded t25 and has no problems.There are definately benefits to recirculation. Plugs last longer due to not running rich when coming off boost. I wanted open atmosphere, so I tried that first then I had slight problems so I had an intake fabbed for recirculation and now I'm finally content.

lol



just run a blow through like the dude posted already or run a map ecu. its all about metered air.

[MetricHotrods.com]

i guess nissan and every other car manufacturer installed bypass valves for no reason?

get a clue


oh great argument (insert sarcasm). anyone who says "well the factory put it on there" has not been modifying cars very long. worst argument ever.

so sir, lets all just drive stock cars since thats how nissan designed them and changing anything is just stupid right?

i will reitterate. the bypass valve is there to preserve the stock turbo, while not confusing the ecu/maf. HOWEVER, if your car is modded, and you have a quality, ballbearing turbo, then not running a BOV isnt going to hurt it much. and if it does, you put another one on there.

running a bov is like saying "hi, i would like a boost leak. and i want it riiiight heeerrree"

[garbury]

Sileighty is right in some way I feel. Old t25 used to stall all the time back in the day. the 2871r only has issues due to the injector size and its only on cold starts. I never stall after its warm with the bigger turbo. Though it could just be that you can tune for it too, and eliminate that rich point.

[allntrlundrgrnd]

oh great argument (insert sarcasm). anyone who says "well the factory put it on there" has not been modifying cars very long. worst argument ever.


your right i have not been modifying cars for a relatively "long" time, but id rather spend 200 bucks on a quality bov that does not leak at idle or give me any problems whatsoever than replace a turbo that took a shit on me unnessecarily.

once again, can we let this thread die please

[moses]

I dont know, I got a Greddy RS bov vta and it doesnt give me any problems. But I think I will recirculate my bov just because it is better. It does help with spool so there is no bad things that could happen exept the cool sound. IMO why not?

[MetricHotrods.com]

your right i have not been modifying cars for a relatively "long" time, but id rather spend 200 bucks on a quality bov that does not leak at idle or give me any problems whatsoever than replace a turbo that took a shit on me unnessecarily.

once again, can we let this thread die please

the part youre not getting is the "quality" doesnt matter. they just leak. period.

if i was to run a BOV, which when i put together my twin turbo set up, i might, it will be dual greddy type R bovs and it will sound like the hammer of Thor.

problem is, they dont pass JCI

[98koukile]

If they leak you're doing it wrong... I know plenty of people running high psi on big turbos with no boost leaks (known to them)

[ryangreg]

surge sounds 20 times better than a bov, I run 1.5 bar on my BB turbos, no issues.

full boost in 1st gear with quick lift off the throttle for added surge every shift.

I love when people dont have a clue and still have to flex their e-muscles real quick with uninformed posts because they are subscribed to super street.

you guys ever stop to think alot of the shit the aftermarket is saturated with, isnt for your benefit or your cars, rather the manufacturers bottom line?

[yokotavia]

Are you going on/off throttle on that turbine in a drift type situation at least 3 times a month?

about 4 times a month.

i was tboned in touge a while ago. so i have some down time atm.

but, before the crash i was going to a 6 corner touge road, then went to the Ebisu circuit drift matsuri (festival) where i was beating on my turbine for literally 25 hours straight and stopped for nothing except food, tires, and gas.

turbine is still pulling hard with no BOV.

[usdm180sx]

surge sounds 20 times better than a bov, I run 1.5 bar on my BB turbos, no issues.

full boost in 1st gear with quick lift off the throttle for added surge every shift.

I love when people dont have a clue and still have to flex their e-muscles real quick with uninformed posts because they are subscribed to super street.

you guys ever stop to think alot of the shit the aftermarket is saturated with, isnt for your benefit or your cars, rather the manufacturers bottom line?

That's until your turbo blows. Hope you have deep pockets or a sponsor to pay for a new one when it blows.

[WILDACEX187]

i've heard of turbos lasting 2 years on no bov

[SoSideways]

i've heard of turbos lasting 2 years on no bov

And it probably would have lived a bit longer if it had a BOV.

All speculation though, unless it's the same turbo on the same car tested with and without a BOV strapped to it, which is pretty much impossible to do that test, seeing as if it's on 2 different cars, then it wouldn't be an accurate enough test.

$200 for some peace of mind? Sure, I can afford that.

[WILDACEX187]

in 2 years time u either wanna upgrade or sell the car :-/