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Stock Gtr Bov Plumbing

BlackRBS13

By BlackRBS13,
in Engines & Forced Induction

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BlackRBS13 Contributor

BlackRBS13

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I was just wondering how the stock gtr bov's are plumbed. are they located on the side of the intercooler near the throttle body or the other side near the turbos. Also do they resirculate one to each turbo or how is it set up? I am wondering cause I am plumbing BOVs for my swap in an s13 and it did not come with any ic or piping. Thanks for your help guys any and all info will be usefull.

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TTT Grand Master

TTT

Posted
Posted

GTR has 2 bovs.

They are mounted on a single larger pipe (bit smaller than the intercooler piping) and are located in the drivers side kinda in the front air dam..

So if you are looking at a GTR front on, you will see the big space in the middle for the intercooler and the smaller space on your left (drivers side when looking front on) is where you will see the bovs.

The plumbing for it is like a Y pipe. 2 hoses join to become one and the one pipe goes all the way over to the intake pipe which is from the air box to the turbo’s.

Why it has 2 bovs?

Not sure.

I doubt it has anything to do with 2 turbo’s.

My guess is it has something to do with the fact that the rb26 has individual throttles.

It seems people who change the bovs to atmo ones on rb26’s have all sorts of problem with idle and turbo surge etc..

saliya Rising Star

saliya

Posted
Posted
Thanks. are they plumbed back before or after the mafs (afms)?

"after" - by 'after', I mean 'closer to the engine'. Air that's re-circulated is not supposed to be measured twice.

Just plumb your system back somewhere between your AFMs and the turbo inlet.

If you take a look at a diagram or pull a GT-R's inlet pipework to bits you'll see where the re-circulation pipe rejoins

the system. When you get all the bits onto the bench(es) you will not _believe_ that they all go back in that little tiny space :))

This is possibly why the pipework was not included :yes:

The valves are in parallel; so I'd guess that there are two simply to allow for more airflow when they are open while

keeping the response characteristics of a single smaller valve. They _may_ be sprung differently (I've never

tested) but they look identical.

Regards,

Saliya

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