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Stock Gtr Bov's Good For Atmo?

jeffworld2

By jeffworld2,
in Engines & Forced Induction

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jeffworld2 Veteran

jeffworld2

Posted
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hi was wondering if anyone has attempted to run stock gtr or gtst bov's venting to atmosphere. just did a whole lot of stuff to the car and for simplicity want an atmo bov, but i have a lot of stock ones sitting here doing crap all.

if they are ok to run atmo, i will weld those flanges on, but otherwise i have to buy a new bov.

turbos are twin gt-ss. any help appreciated

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted

They leak at idle.

So no, they will not work in ATMO format at all.

ps. ATMO BOV's are a waste, stock ones are good for over 600rwkw (tried and proven).

Without a tune your going to potentially have backfires, stalling, all sorts of drams

RB30-POWER Mentor

RB30-POWER

Posted
Posted

standard bov are designed to recirculate on idle, so no it will not work if vented as stated.

just run without a bov if its only a short term fix.

aftermarket bov have a massive spring in them to prevent manifold vacuum from opening them on idle, but it also makes them not as efficient as standard because they have a harder time opening when they do actually need to dump the air.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
whats wrong with the one on the car atm jeff??

Its possible to mount a factory GTR valve on the old GTS-t pipe where your current one is and run a plumb back return up into the bottom of the intake pipe.

Yeah, i have RB26 twin BOV's installed with my HR31/RB26 combo :laugh:

Same for R33, very much possible with not a lot of re-work, just move the BOV's to the passenger side and your laughing.

jeffworld2 Veteran

jeffworld2

Posted
  • Author
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current one is a china power trust copy..

when holding speed it just pops off every 2 seconds, works fine under load but yeah its chewing fuel and knocking a bit by screwing with the a/f. spring is as tight as possible, and it still blows off even at about -10pounds of vacum if i take my foot off. the constant surging type thing occurs when trying to hold 70+kmh and continues under light acceleration until the air is chewing the fuel turbos are making.

i know i can run it back up through to the intake but it is not acheivable by me at home and i would want to run 2 gtr bov's if i was going to plumb it back in.

i was looking at buying a trust type r or something but its a lot of dough when i have 5 bovs sitting here, and was also wondering if there could be a problem with the pressure feed the bov is getting from the manifold

Risking Grand Master

Risking

Posted
Posted

The problem you have is not a BOV issue. sounds like you have compressor surge now you've fitted the larger turbos. replacing the valve is not going to fix the issue.

I was actually wondering if the twins on an RB25 would cause similar surge problems to those that the RB26 suffers from.b

You seriously need to get off the run in tune and do it properly now.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
The problem you have is not a BOV issue. sounds like you have compressor surge now you've fitted the larger turbos. replacing the valve is not going to fix the issue.

It could well be actually.

RB26's do get a bit of 'shuffle' going on in twin setup with atmo BOV's due to the factory ones being open early and actually stopping the shuffle

jeffworld2 Veteran

jeffworld2

Posted
  • Author
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i agree, its very similar to what joeys car was doing in your driveway after his turbos went in, but its a bit constant. even if it was the bov, its caused by surging so i dont know why this thread is still going.. i just wanted to see my options and now we have. brad you have pm

jeffworld2 Veteran

jeffworld2

Posted
  • Author
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when you spend months building a motor that has a lot of custom piping etc, you dont want to spend more time fabbing up something so you can plumb a stupid bov in, you just do the easiest and quickest, trust me

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