What the hell is this.

[Squizz]

My GTR screams/whistles it's tits off when it comes on boost.

It's not the intake pipes, been checked.

It's not the Intercooler pipes, been checked.

It still boosts properly and is not down on power.

There is no extra exhaust noise.

There is no smoke, fuel or oil.

It still idles/drives perfectly except when you start to boost.

The noise is akin to a giant frog humping a Boeing 747.

Any ideas?

I was thinking a gasket around one of the turbos (hoping) or worst case, the turbo itself (which it won't be because I said so and I am not paying for new ones so they must be fine... )

[Terminal]

my car used to do this, i was still getting boost etc. turned out 2 of the studs that hold the turbo to the manifold had sheared off, and the manifold had warped slightly. not sure if this is the same noise though.

[666DAN]

The noise didn't start after you lent it to the other half did it?

[Squizz]

  666DAN said:

The noise didn't start after you lent it to the other half did it?

You could be onto something...

[KamikazeR33]

bov leaking a little? or else id suggest a manifold leak somewhere perhaps

[Squizz]

  KamikazeR33 said:

bov leaking a little? or else id suggest a manifold leak somewhere perhaps

Possibly but they on the other side of the car (although they do plumb back over to the other side) and the car isn't running rich so I can't see it being the pressure side of things.

[666DAN]

Honestly would have to hear if it's more of a mechanical squeel or a high pressure air-ripping noise.

Maybe that's that noise I heard at Griffitth the other day...and I thought it was Mothra and Godzilla fighting

[Squizz]

  666DAN said:

Honestly would have to hear if it's more of a mechanical squeel or a high pressure air-ripping noise.

Maybe that's that noise I heard at Griffitth the other day...and I thought it was Mothra and Godzilla fighting

Starts as a whirrrrrrr then an almight scream. When it's low it sounds mechanical-ish but but once it's screaming it's air and lots of it.

[666DAN]

So you've got both....that's just greedy

Hmmm sounds like a listen and point mission, just get someone to give it a good rev while you stick your head under the bonnet...once you've got a fairly localised point of refererence you can start arranging a bank loan to cover the faulty part

Not the water pump is it....I had one that sounded like a banshee?

[Squizz]

  666DAN said:

So you've got both....that's just greedy

Hmmm sounds like a listen and point mission, just get someone to give it a good rev while you stick your head under the bonnet...once you've got a fairly localised point of refererence you can start arranging a bank loan to cover the faulty part

Not the water pump is it....I had one that sounded like a banshee?

When it's free-revving it's fine, only under load and boosting it makes the noise.

[666DAN]

You're just making this hard now OK I give up what's the answer hahaha

[Squizz]

  666DAN said:

You're just making this hard now OK I give up what's the answer hahaha

I wish I knew...

[666DAN]

Yeah sorry, without being there I can't really start to make any more conclusions on it...being under load, you'd assume it must be turbo related....maybe a hose has got a slight leak...like the squeeling a balloon makes when you pinch the end of it????

[Squizz]

  666DAN said:

Yeah sorry, without being there I can't really start to make any more conclusions on it...being under load, you'd assume it must be turbo related....maybe a hose has got a slight leak...like the squeeling a balloon makes when you pinch the end of it????

That's what the exhaust shop said but be buggered if I can find it!

[TTT]

it's the gasket or gaskets between turbo and manifold.

happens if the bolts holding the turbo to the manifold come loose or off in my case.

I had one go missing and that corner started leaking and burnt through the gasket.

when you start accelerating, it is a whirr, then as boost goes up, so does the scream and pitch.

I didn't lose any boost or power at first but eventaully I could feel that it was slugish.

if you don't replace the gasket/s, it will eventually leak at idle and you will get like a chuff chuff sound sort of like a lawn mower at idle.

nissan turbo to manifold gaskets are not that expensive.. if I remember, on my r32 gtst, it was $27 from GCG turbo's in sydney.

that pack contained the gaskets between turbo and manifold and some smaller ones for the oil and water lines.

[Squizz]

  GTST said:

it's the gasket or gaskets between turbo and manifold.

happens if the bolts holding the turbo to the manifold come loose or off in my case.

I had one go missing and that corner started leaking and burnt through the gasket.

when you start accelerating, it is a whirr, then as boost goes up, so does the scream and pitch.

I didn't lose any boost or power at first but eventaully I could feel that it was slugish.

if you don't replace the gasket/s, it will eventually leak at idle and you will get like a chuff chuff sound sort of like a lawn mower at idle.

nissan turbo to manifold gaskets are not that expensive.. if I remember, on my r32 gtst, it was $27 from GCG turbo's in sydney.

that pack contained the gaskets between turbo and manifold and some smaller ones for the oil and water lines.

Ok, your explaination is winning so far! Sorry Dan :wassup:

[TTT]

if you can get your hands and the right tool down there, try to tighten (slowly) the bolts that hold the turbo to the manifold.

you might be able to have a temporary fix till you can be bothered to get new gaskets.

where are you located?

[Squizz]

I'm in Brisbane mate.

[TTT]

hmm.. perhaps mercury motor sports could arrange the gaskets for you..

I don't know of any other places up there..

and I've only hear GREAT things about them..

www.mercurymotorsport.com.au

good luck

TT

[TeamKrazy]

its your turbos jay, buy new big ones