Jump to content
SAU Community

Recommended Posts

Andrew,

A good mate of mine up your way (his nick is 'third' on SAU) has been researching this exact topic recently! He has a '97 GT-R with a quite a few mods (311awkw SAS dyno) & at times runs 20+psi.

As you can imagine he's had a wide range of responses on the stock BOV topic. Jim from CRD seemed to think the stock BOV's weren't a problem even at mid 300kw levels (at wheels). We asked a few local Adelaide tuners & one of them said straight away that above 15psi & they "can" leak.

He is planning on doing a bench level pressure test to see exactly what psi his BOV's open, may have already done it?

No prob's mate. It 'may' take a little while for him to reply as he's not a frequent SAU user (posted twice in total) Tell you what, I'll give him a ring tonight & see what he's got to say.

Do they leak easily?

I'll be running upto 1.5  bar... Will the stock BOVs be okay? Or will they be leaking causing me to stress the turbos out unnecessarily to make 1.5 bar at the plenum?

Theyre crap, want to sell them to me or trade for Blitz DD setup? :):D

Being serious though, ive been told by many a shop they can hold decent amounts of boost without leaking (upwards of 1 bar). If you do take them off, send me a PM as ill be extremely interested in buying them. The Blitz ones are cool and all, but nothing compares to the woosh noise the stock ones make.

Hey, thanks heaps for the help guys!

Amaru: I'll probably end up replacing them with a single Trust Type-R BOV in a few months time... If I do, I'll send you a PM...

YRL05S: That would be great, but does your compressor have variable psi? If not, how will you know what pressure it takes before they open? Let me know how you go :)

  • 2 months later...

Merli,

I have used Blitz ones and they make the car run terrible. Boost isnt responsive and idle is horrible. On recommendation from HKS Japan, I have returned to the standard GTR ones. Even HKS do not recommend replacing the bov. Even if using a hks item.

Quote: "BOV changea.. noo good.." "Original good"

FYI: this was for a gtr running 2530's.

Whoa... this is an old thread! :D

Butthead: I'm not going back to stock BOVs, I have them on there at the moment, and I was worried that they would open prematurely and leak, causing my turbos to spin extra hard to make the 1.5-1.6 bar I want at the plenum... So I started this thread to see if I would need to change to a Trust Type-R or something like that... Seems like the stockies will work just fine!

Thanks N/A... Sounds like the stock bovs are going to stay! :(

Kamikaze: Not sure whether they're spring or diaphragm-type bovs... In fact I don't even know if there's a difference :)

Guest INASNT
we should ask leewah how they are as he still uses them on the 500rwkw plus gtr

the ice supra which has 400+rwkws runs these aswell aparently

niges supra is putting down 500rwkw with 2 bar boost now and still using stock GTR bovs just like Leewah, so i guess they aint that bad.

I got some in my car now as well and its holding 19psi and 280rwkw easily

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • What copper washer do you guys use on the bleeder bolts? The existing one I have I had no idea where to find it in a local store, I did buy some online but that are only 1mm thick whereas my old one is 2mm+ thick and when I put the new washer out and squeeze the top radiator hose I can hear a bit of air but not with the old one. Does this matter? The new one doesn't leak, but the inner diameter is a bit loose whereas the old one threads on the bolt.
    • Howdy all, after being out a few weeks ago on a spirited drive in my GTR I have 2 issues that oddly have appeared at the same time. Whilst accelerating quickly through the gears all of a sudden i’ve lost power at the top of third gear (below redline around 6000rpm) for no obvious reason.    From that point onwards the car has been running rich on idle, won’t really rev under load without a ton of black smoke and the odd backfire, and dying as a pull up to a set of lights unless I keep the revs up around 1500rpm. In addition when shutting down the car that same night (I was 10 minutes from home) I noticed one of the turbos was significantly noisy on wind down when shutting off the engine. After letting the car cool down overnight it starts up fine, although once it gets to temp the revs start to creep up and down, the exhaust is darker than it should be and it also sounds like it’s running rich (fat note) I’ve put a new set of plugs in it - no change, the old plugs all seemed OK with two of them being somewhat richer/fueled up than the other 3 with 1 being borderline. I’ve smoked tested the intake system via the front of the Turbos, found a split vacuum hose going to the factory boost gauge sender, which I have since replaced.  Also found another leak on the gasket coming off the rear turbo outlet, have also replaced this. After fixing both of these leaks - still have the running rich issue. I’ve also tried another pair of AFM’s - no change here After pulling off the front turbo intake pipes, there is obvious shaft play in the front turbo, which now hisses loudly on light revvs although I can’t see why this would make the car run funny even under idle. I’m curious to know why it’s running rich before I potentially replace/rebuild turbos. The car is completely stock <50,000kms  other than an exhaust. Oil and coolant are all clear. I haven’t bothered with coil packs as it looks like they won’t be the issue due to condition of the plugs. Any help appreciated as I cry myself to sleep!
    • No probs at all. I used to love trying to dig up obscure info for those in need where possible going back 20+ years on SAU.  I did have another look and couldn't come up with any closer match. I'm leaning towards those skirts in your first pic are custom fitments, cut down/extended or from another car entirely and modded to fit an R34 sedan. I would've thought someone in Japan had them and taken a photo at some stage over the last 2 decades but there's nothing. Someone out there must know surely.
    • Welcome mate. Any pics? Even with a DE I'd be well happy if I had that as a 1st car. 
×
×
  • Create New...