How are stock GTR BOVs?

[Merli]

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?

[whatsisname]

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?

[Merli]

Thanks Matt, I'll send him a PM

[whatsisname]

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.

[Amaru]

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?

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.

[YRL05S]

I've got a set at home, if i hit them with compressed air would that tell me at what point it leaked? I'll give it a go and i'll let you know.

[Merli]

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

[NRB]

Ben (Racepace) assured me they're a bloody item. I had to search high and low to get my hands on the stockies as my car came with a dodgy HKS item.

I love the sound the stock units make too.

[YRL05S]

Merli

For pressue control on my compressor, watch and learn.

I'm going to do it now, it's raining so the neighbours won't complain about the noise.

[YRL05S]

Good and Bad News.

They can hold over 20psi, why i say that is that the boost guage is was using to measure runs out at 20psi. By the looks they start to open about 22 -24 psi, but i can't be sure, sorry.

[Merli]

That's awesome... Thanks heaps for that mate!

That's all I need to know

[whatsisname]

Looks like you guys have it sussed, good stuff! I'll still post my mates results once he's tested his BOV's, just for shits'n'giggles

[butthead]

Merli

What's the reason why you are going back to stock BOV's

[N/A®]

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.

[KamikazeR33]

as a question, if they leaked, couldnt u just replace the spring in them to a stronger one? or they dont have springs in them?

[Merli]

Whoa... this is an old thread!

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

[summoner]

i'll keep my stock bovs on my 26 then instead of moving my HKS SSQ over from old setup..

[butthead]

I've got the blitz bovs which vent to the air, might go back to the stockies if they dont leak.

[KamikazeR33]

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

[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