Gtr Owners Question, Turbo Whistle/screaming Noise...

[gwin]

So i find that on boost, especially in the 5krpm+range my car screams like a mofo. Its a nice sound, but I would have thought a "stock" GTR wouldnt be that screamy! I don't think that its anything leaking because the car pulls, I also know for a fact that I have stock AR.42s.

Is this normal?....

If anyone has a 32 near Preston Melb and can let me sit in their GTR for comparison that would be great

[SiR_RB]

how much boost u running? i found the turbos to make a more high pitched induction noise when running 13psi then when i did on low boost 10.5psi....

[Trozzle]

it's either air being forced through a hole somewhere in your piping after the turbo/before head, or the suction is sucking some piping closed (not sure if the second one can happen on a GTR)

[gwin]

I'm on 14 psi, oh the only other non stock thing is twin blitz bovs. If there's any air leak, my boost pressure would be less than expected. hmmm I'll try and find someone with the same car and listen to theirs.

[R31Nismoid]

Boost pressure would not be less.

depends where the boost feed is coming from.

honestly its sounding like a boost leak, leaky BOVs or dying turbos.

Can't really be much else

[gwin]

hmm OK, I'll do once over with the pipes and see if somethings come undone

[The Mafia]

Last time I hopped in a Skyline with a "screaming" turbo, the turbo was stuffed.

Just be careful mate, I'd inspect it before doing anymore driving. A Stuffed turbo can equal engine failure.

[gwin]

Thanks for the reply guys

it ISNT like this though http://www.youtube.com/watch?v=UacMOiZ2YwM

I wish I could record the sound some how hmm

[gwin]

it's more like this...

I'm probably just paranoid... but having a stock setup that loud is questionable..

[SiR_RB]

turn the boost down abit and see if it goes away

its just induction noise...

[Duncan]

Standard stuff should not be making any sort of screaming noise. the only time I've heard somethign I would describe as screaming it was stuffed bearings in the turbo core. Next closest noise I've heard was a nasty manifold leak.

either way....they didn't leave the factory with any sort of "screaming" noise

[LANDSCRIBBLE]

ive been hearing a sort of high pitch whistling sound for a while also, though only when on full boost (was doing it before at 7 psi, but 10-12psi atm). me mechanics thought that maybe it was coming from the turbo itself (bearings/shaft play?), or possibly from the wastegate. ive read somewhere on here a guy had the same noise, turned out it was leaking on the turbo exhaust manifold join or something. im sort of dreading its the turbo, hope it can hold up for another 6+ months..