Fluttering sound from around turbo?

[Anquetil]

As soon as I jumped in my car this morning there was a loud fast fluttering sound which seems to be eminating from around the turbo, it flutters only when revving and accelerating not on idle and the car as a whole seems allot more sluggish.

On Saturday I changed the oil & filter, all was fine on Sunday I did about 200kms with no sign of fluttering, Sunday I was also trying to setup my high setting on the dual stage boost controller that I had installed a month ago. But after adjusting and testing I could get no boost increase out of it so I carefully set it back to the original position to be safe.

I can also hardly hear the BOV anymore too. All valves and hoses around the boost controller seemed secure and tight. Leak maybe?

I know this isn't very descriptive but anyone got any ideas?

[GTS20X]

I don't know about the rest but it could be related, the noise sounds like an exhaust leak and as you mentioned it was sluggish its probably before the tubo, either the turbo gasket, exhaust manifold gasket and/or broken studs allowing the gasket to leak.

Carlos

[Anquetil]

Well I just turned the boost controller down as far as I could and took it around the block, it seems to be getting louder, and after sticking my head right in there it seems like the ticking is definately coming from the turbo or what I think is the manifold? It sounds like V6 carby engine when revving

Oh man, I'm wondering if i've overboosted it yesterday when fiddling with BC, though according to my boost gauge I didnt go over 6PSI

[qikr33]

rev the car and turn it off at the same time .if ticking continues and slows to a holt after rpm have dropped it can be none other than your turbo

if not it sounds like a exhaust leak.

if you cannot hear the bov .is the fluttering noisr only happening when you rev then let the foot off.It sounds also like the vacuume hose tthe bov has come off somewhere and is not actuating it to open hense the fluttering noise as the air is chopped up by the turbo when it hits the closed throttle butterfly and is forced back through the turbo.

But... is it a fluttering noise or a ticking noise..

fluttering=bov

ticking=exhaust

ticking with car off.=car bomb

[Anquetil]

I'll try the turning off thing tomorrow, bit late for the neighbours now.

It's probably more of a ticking sound, and after sticking my head right down its actually ticking on idle as well.

Thanks for the info.

[HKSgtst]

whats the ticking thingy all about ?

[qikr33]

leaking exhaust gasket.this is the sound it makes when it starts to leak or there is a crack in the exhaust

[Anquetil]

Certainly was louder this morning.

Anyhow, I'm taking it to the local workshop to see what they reckon today.

[Yakuza]

my car has a ticking sound thats on the passenger side of the engine , what does that mean ? thanks.

[Freebaggin]

Mine makes a ticking noise from the rear of the engine on the exhaust side and after I fitted an EBC and did some dyno work and a drag day I noticed a couple of rear exhaust studs had broken off. So now I have ticking and also the fluttering noise at idle, particularly when cold.

So it looks like you have same problem. The guys at RPM said not a big issue, but it will get worse. The heat cycling on the long steel exhaust manifold next to the alloy head causes bending and in the end the gasket and then the bolts give way.

Anyway, hopefully thats all it is mate. Might just need a new exhaust manifold gasket down the track.

[Anquetil]

Just got back from the workshop, and it is a damaged turbo gasket. He picked it in about 2 secs. Its pretty damn obvious once you look at it.

Basically the thin paper like seal between the turbo and manifold/engine. If that makes sense.

I'll post a pic tonight for reference,

[nitemare5]

Yeh, I had a very similar problem a few months ago. Was late at night, some bogan in a VT pulled up next to me and wanted a run, so i gave it to him then i realised next set of lights there is this flutter noise coming from the turbo =(. First thought was something wrong with the manifold, but turned out to be liuke yours, the gasket. Bought the gasket the next day and installed it myself with a friends help, was a ****en big job for someone that didn't know what we were really doing

[Anquetil]

http://members.optushome.com.au/shanepc/skyline/01.JPG

http://members.optushome.com.au/shanepc/skyline/02.JPG

Did you have to take the lines off? Or simply just unbolt it enough to slide in the gasket? I looks pretty easy but I bet its a prick to get too.

[Yakuza]

how much is the gasket + installation ?

[nitemare5]

I had to take the whole line off.