R34 Gtt - Pop Then High Pitched Whine When Accelerating

[flashy]

Hi all, I recently bought another skyline, an r34 gtt.. it's been driving beautifully until tonight.

I was on the way home and gave it a bit of a squirt, nothing crazy, but a reasonable amount of go.. when I shifted and revs came down to 'normal', there was quite an audible pop.

Following the pop, for the next 5 minutes home, under any acceleration there was a high pitched whine from the engine bay.

I didn't hammer it after this as I was bloody scared (I still am) that something has gone horribly wrong, but the turbo seemed to be spooling up okay, although from my boost controller it seemed to be coming up a little slower than normal (ie, under minimal load it would sit around 0, now it was sitting around -5 if that makes sense).

When its light in the morning I'll check if any vacuum hoses have popped off.. seriously hoping that is all this is?

What else could it be? Although I know it most likely is.. please don't say dead / dying turbo... How much is a replacement going to cost me? -_-

[SargeRX8]

Sounds like a gasket somewhere either mani to turbo or turbo to dump. Could also be a hose so check those first.

[flashy]

Sounds like a gasket somewhere either mani to turbo or turbo to dump. Could also be a hose so check those first.

Cheers for the quick response! Will definitely check all hoses in the morning. I'm *hoping* after seaeerching / reading around that it could just be an FM intercooler pipe that popped off? Would explain the pop and the noise.. fingers crossed.

If not, how would I check the gaskets? Off to the mechanics I'm assuming?

[Sinista32]

Ceramic Turbo wheel off the spindel

[flashy]

Ceramic Turbo wheel off the spindel

Does that mean a turbo rebuild / replacement?

I didn't get a chance to look over it this morning but will this arvo. Either way I've got it booked in with the mechs for Thursday morning to be safe.

Will keep this thread updated!

Edited September 10, 2013 by flashy

[RBSpud]

Does it have a fmic, if so check all the hoses and jubilee clamps. Very common to pop under boost if under tensioned or poor quality. Hopefully a simple fix.

[SargeRX8]

Ceramic Turbo wheel off the spindel

Would he still be able to boost though? He said he can just its lazier than usual.

Pull off your intake pipe and give the compressor wheel a good jiggle see if it moves at all, side to side/back and forwards.

[Plattsy]

id say you hvae a boost leak or loss of pressure somewhere. blown turbo would not make boost.....

[Sinista32]

Both of you are spot on. There would be no boost / positive boost pressure if the Turbo had failed.

I should pay attention when skimming through

what thru me was "Following the pop, for the next 5 minutes home, under any acceleration there was a high pitched whine from the engine bay"

when I have popped an IC pipe in the past I have not had any noise after the initial "pop". to have a noise it may not be off completely or a smaller hose somewhere.

Plus - I did my OP6 Turbo a few weeks back. I heard a PoP and any acceleration I received a whine noise . But your right the gauge did not go over Zero......

[jjman]

what thru me was "Following the pop, for the next 5 minutes home, under any acceleration there was a high pitched whine from the engine bay"

when I have popped an IC pipe in the past I have not had any noise after the initial "pop". to have a noise it may not be off completely or a smaller hose somewhere.

depending on the joiner or hose (or gasket) to go there can be a range of noises the motor can make as its forcing the air out through the leak.

To OP, start the deductive process of elimination my friend.

Also just because something 'looks sealed' doesn't mean it is. I popped the seal on my crossover pipe before and I couldn't tell it was the problem upon visual or feel inspection.

[suwidji]

same thing happened to me when i didn't tighten the silicon joiners on my intercooler pipes tight enough. Popping noise was the cooler piping coming loose (and even open one time lol), and whenever i accelerated there was a high pitch whine, audible from inside the cabin.

Un-did all IC piping joints, and put it all back together nice and tight. fixed it up fo rme!

[Blackkers]

When I popped an intercooler pipe the car wouldn't run much higher than idle and there was huge amounts of black smoke coming from the exhaust; the car was undrivable.

I figured the turbo was still sucking air through the AFM but it was just leaking into the atmosphere, the ECU was trying to use way to much fuel for the amount of air actually going into the engine.

I unplugged the AFM and the car still ran like a dog but made it home easy.

without sealed IC piping, car barely runs at all

[GTSBoy]

Yeah, but there's popped and there's popped. Popped open means a massive air leak either inwards or outwards depending on whether you can get it to boost. A little pop might mean that it doesn't allow much/any to get sucked in, so you don't have a bypass of the AFM and hence lean running, but put a bit of pressure inside and it opens up and screams. Plenum gaskets are the poster boy for that noise.

[BMX666]

When you hear a pop and then a whine when it should be boosting, this is probably what you've done. This happened to me yesterday. Shaft is bent along with the destruction you see.

[GTSBoy]

For the benefit of future generations.......Can you quickly outline, what turbo, what engine, what history, what boost led to that death?

[Sinista32]

@ #flashy Any update?

@ #@GTSBoy

my Turbo failure - wheel off spindle

2001 R34 GTT Neo (s2), 130k kms, OP6, Auto, daily street driver - no abuse since owning last 3 years, stock boost.

cant really say how it was treated prior to my ownership, however the condition when I purchased the 34 was - very well maintained. (a heck of alot better than the other 7 looked at)

(pod, return flow fmic and aftermarket exhaust)

[jjman]

its all age and luck with these things now.

My '93 S1 GTST's turbo was still fine, n I ran it for 2 years at 15psi...

Ended up swapping it out for a HKS turbo cos I wanted more power. the stock turbo was still going strong though. Go figure.