Whistling Noise On Boost

[Medium Dave]

Hey all, I just managed to get my car running really nicely, now after driving for about half an hour over the mountain I turned around at the bottom to go home and then on boost there was a slightly demented whistling noise that increases with more boost, like there is air excaping under the pressure. I have checked all the hoses and they are tight. I went for another drive and the whistle seemed to flutter when I went over a bumpy section of road, could this be the standard bov giving up? or could it be something else? -I had a turbo die rercently, and it sounds different, oh and I am running standard boost, any ideas much appreciated

[Dale FZ1]

Double check ALL hose clamps.

I had a similar experience. The clamps SEEMED to be firm, but after replacing the joiner hoses some months ago there was evidently some compression of the rubber that decreased the effective clamping pressure. Another half-turn on the clamps cured it.

Not coincidentally, I noticed the noise increasing when I bumped up boost from 10 - 14psi and began developing the fuel map to suit.

[Medium Dave]

Thanks Dale, I will take them all apart tonight, clean them up and re-assemble

Edit: Fixed, it was the turbo - the bolts attatching it to the manifold were a little loose, thanks guys

Edited November 23, 2006 by Medium Dave

[Mr Italy!]

Yeah mine has a nasty whistle on boost too - could be turbo dying, could be BOV leaking, could be pipes leaking...

[izataskyrine?]

ahh dont turbo's normally whistle? every turbo car ive been in with a pod filter you can hear induction noise (whistling)

[Willo]

Check your turbo gaskets. My 33 GTR had a whistle on boost and it turned out to be a dodgy gasket.

[drf76]

Check your turbo gaskets. My 33 GTR had a whistle on boost and it turned out to be a dodgy gasket.

definitely what he said, mine whistles (sounds more like a loud screech) onto sudden full boost like when your clutching it to take of hard, its the gasket that mounts the turbo onto the exhaust manifold, gas is trying to escape through a tiny passage somewhere in the gasket.

[Nabil]

Yep, same problem with my R33.

Took off the turbo last Friday for an upgrade and i realised the rectangular gasket from the collector to the turbo had may deep cracks in it.

Must of had one more thrashing in it left before it leaked constantly.

[Chris_R33GTSt]

Hi, my series 2 33 GTST has been developing the same problem. It makes a harsh screech as it comes on to boost (It does have a massive Blitz pod filter). I always thought that is was due to the nylon compressor wheel. If I was to do the gasket off the manifold to the turbo, would there be any other gaskets that would or should require replacement?

Cheers,

Chris.

Edited November 24, 2006 by Chris_R33GTSt

[drf76]

Hi, my series 2 33 GTST has been developing the same problem. It makes a harsh screech as it comes on to boost (It does have a massive Blitz pod filter). I always thought that is was due to the nylon compressor wheel. If I was to do the gasket off the manifold to the turbo, would there be any other gaskets that would or should require replacement?

Cheers,

Chris.

yeah thats pretty much the only one, not sure from memory if theres one at the down pipe from the back of the turbo just double check and theres one metal gasket on the outlet of the turbo(compressor side) but you can reuse that one for sure as i have many times

[(B1) MR_fanny]

yeah im pretty sure its the turbo/dump gasket. had a dodgy front pipe installed before with a leak that created the whistle sound. installed a proper dump pipe and the noise went away. scraped my cat on a speed bump which must have losened the joints and the whistle is back. gonna have to re-tighten the dump again when im free.

[recce]

I have the same problem too. Have a look at the exahust manifold and found 1 loose nut. Tru to tighten it but it would not tighten up. So I try the next one, same. Cannot tighten up. Does any of yours have the same problem?