1 Or 2 Gtr Bovs?

[JoELMaN]

well guys, ive purchased a pair of gtr bovs and the assembly and was going to put them on my s14, just a few questions

why is there 2 on a gtr?

wat is the little 2mm or so hole that vents to atmophere in the side of the bov?

will i still get that cool "chooo" sound if i only use one? (blumbed back of corse) because fitting 2 in my engine bay might be abit harder than i thought it was going to be

also what do they bovs sound like when they vent to atmosphere?

thankx guys, any help appriciated

[R31Nismoid]

You can use one if you want. I was.

You will get a little noise if you have a pod. airbox, not so much.

They are not an ATMO BOV. Dont try to use it as such

[JoELMaN]

thanks man

also what makes it a plumb back or at atmo bov?, are they actually designed differently? i thought one just had a place to adapt a pipe?

[R31Nismoid]

IIRC GTR BOV's are open @ idle

[paulr33]

2 bovs as there are two inlets, two afms, two turbochargers

each has its own recirclation valve and airflow meter reading so you need two

[JoELMaN]

but its goin on a single turbo s14...does that mean i can only use 1 anyway?

[paulr33]

well you only have one recirculation line so most likely yes but i know people that run the twin bovs on a single turbo car still so not sure

[JoELMaN]

yeah, well ill see how i go, theres what looks like 2 vacuum line comming out of the plenum, both with screws in them . maybe i could use them,

anyway thanks for ya help guys

[JoELMaN]

while we are on the topic of gtr bovs, does the gold bit on top screw off or what?

[R31Nismoid]

2 bovs as there are two inlets, two afms, two turbochargers

each has its own recirclation valve and airflow meter reading so you need two

Nah, its actually one pipe, nothing to do with 2 turbos/afm's. Leewah/nige/ben all use big single's remember

If you look the stock crossover pipe thing they two BOV's join into the one hose.

well, thats what i thought from briefly looking @ my two im using on my next project

[Ryosuke Takahashi]

just a question...do you "have" to have these 2 bovs on a RB26 since its using 2 afms ?

what happens if you dont have bovs on a gtr thats using a stock ecu and stock afm's?

thanks.

[JoELMaN]

I dont own a gtr but i think after the bovs come together that pipe splits into 2 again and one comes in infront of one turbo and the other the other turbo right?

i recon using one would be fine aslong as you have a splitter at the end so equal air is put back infront of each turbo, also only having one means only 1 vacuum line, so one of the existing lines would have to be blocked off

[saliya]

well guys, ive purchased a pair of gtr bovs and the assembly and was going to put them on my s14, just a few questions

why is there 2 on a gtr?

Flow area - you could achieve the same effect by having a single larger one with the same flow

area as the two added together, but there are probably good reasons why Nissan went

with two smaller ones rather than one larger one that I'd hesitate to guess at. If you've got

the whole assembly you'll see that they join back to a single recirc pipe which then splits

back into two under the stock airbox and rejoins basically just before the inlet side of

the turbos.

wat is the little 2mm or so hole that vents to atmophere in the side of the bov?

no idea; having not pulled one apart I'd assume it's to permit air equalisation between the

atmosphere and the bit 'between the diaphragm and the valve itself'...

will i still get that cool "chooo" sound if i only use one? (blumbed back of corse) because fitting 2 in my engine bay might be abit harder than i thought it was going to be

The sound's related to the volume of air and the speed it moves at - you might find that

one is louder/higher pitched than two together because the air will have to move faster

through a smaller total orifice and for longer to get rid of the same volume of air.

I've never tested the difference, so that's pure conjecture.

also what do they bovs sound like when they vent to atmosphere?

Probably very similar to any other VTA BOV. It's just air moving around, after all.

Some BOVs have funny characteristic sounds, but I doubt that the GTR ones

will... suck it and see

Regards,

Saliya

[Mik]

2 bovs as there are two inlets, two afms, two turbochargers

each has its own recirclation valve and airflow meter reading so you need two

<{POST_SNAPBACK}>

No they don't. The BOVs are just in parallel.

[saliya]

just a question...do you "have" to have these 2 bovs on a RB26 since its using 2 afms ?

what happens if you dont have bovs on a gtr thats using a stock ecu and stock afm's?

thanks.

<{POST_SNAPBACK}>

You mean if you take them off or replace them with a different single recirc BOV will the

car suddenly stop working ? No. My car doesn't have the BOVs; I removed them to

put an oil cooler in. It works fine.

But BOVs are supposed to have tangible benefits; one of them being that of less turbo

wear at gearchanges due to the turbos not 'running into a solid wall of air' if that makes

sense. And you'd need a fairly large single to give the same flow area as the twins;

I don't think I've ever seen one that big. _Someone_ probably has, though

Regards,

Saliya