different sound from turbo

[P.S.I]

Last night in Sydney was quite mild and I was driving home at about 10.00pm in my T and heard a sound that I have not heard before.

I was using the SSS and accelerated away from the lights in 1st but was forced to jump off the loud pedal ( at max revs ) due a car pulling out from a side street, this is when I heard the sound.

Is this the boost being dumped ??

Would the cooler dense air on a cold night cause this ? I tried to replicate it this morning and I could not.

There is no discernable loss of power or mechanical noises so I assume that everything is OK.

Any ideas

Cheers

PSI

[shadyxr]

Sounds like wastegate & BOV doing their job. You can hear it if you listen carefully with high revs on the gear change.

[Guest ADICTD]

P.S.I - every turbo car has a BOV to release the extra air, the standard ones jus dont make a noticable noise unless its really quiet>> e.g early morning or late nite like you said,

[aps]

Last night in Sydney was quite mild and I was driving home at about 10.00pm in my T and heard a sound that I have not heard before.

I was using the SSS and accelerated away from the lights in 1st but was forced to jump off the loud pedal ( at max revs ) due a car pulling out from a side street, this is when I heard the sound.

Is this the boost being dumped ??

Would the cooler dense air on a cold night cause this ?  I tried to replicate it this morning and I could not.

There is no discernable loss of power or mechanical noises so I assume that everything is OK.

Any ideas

Cheers

PSI

You may have hit the REV limiter if you were at max RPM, this will make the engine miss fire.......sounds really strange. :lol:

Peter

APS

[P.S.I]

Last night in Sydney was quite mild and I was driving home at about 10.00pm in my T and heard a sound that I have not heard before.

I was using the SSS and accelerated away from the lights in 1st but was forced to jump off the loud pedal ( at max revs ) due a car pulling out from a side street, this is when I heard the sound.

Is this the boost being dumped ??

Would the cooler dense air on a cold night cause this ?  I tried to replicate it this morning and I could not.

There is no discernable loss of power or mechanical noises so I assume that everything is OK.

Any ideas

Cheers

PSI

You may have hit the REV limiter if you were at max RPM, this will make the engine miss fire.......sounds really strange. :lol:

Peter

APS

:lol: :lol:

Peter I am pretty sure that it was not the limiter. That usaully involves feeling like a goose because you are still going forward whilst the car feels like it has stopped :lol:

PSI

[ms700]

If it sounded like a "flutter", it was the turbocharger's wastegate. Well actually its a lot more complicated than that, but that's the simplest way of explaining it.

Completely normal. And sounds I reckon!

[XRPhantom]

From what I can tell it is the BOV, I installed a K&N air filter on my T and you notice it twice as much. I love the sound when you give it a bootfull in manual mode of the SSS and let your foot of the gas.

[Goose]

Last night in Sydney was quite mild and I was driving home at about 10.00pm in my T and heard a sound that I have not heard before.

I was using the SSS and accelerated away from the lights in 1st but was forced to jump off the loud pedal ( at max revs ) due a car pulling out from a side street, this is when I heard the sound.

Is this the boost being dumped ??

Would the cooler dense air on a cold night cause this ?  I tried to replicate it this morning and I could not.

There is no discernable loss of power or mechanical noises so I assume that everything is OK.

Any ideas

Cheers

PSI

You may have hit the REV limiter if you were at max RPM, this will make the engine miss fire.......sounds really strange. :lol:

Peter

APS

:lol: :lol:

Peter I am pretty sure that it was not the limiter. That usaully involves feeling like a goose because you are still going forward whilst the car feels like it has stopped :lol:

PSI

Did someone say my name??

I wouldn't have thought it was the wastegate as the wastegate opens when you hit 6psi to let excessive exhaust gasses bypass the turbine to stop your car creating any more boost. Therefore in theory our wastegates are opening at say 2500-3000 rpm when we deliver boost and staying open.

I reckon it was most definately the BOV realeasing most pressure but if it was a flutter than some of the air in the system would have been going backwards through the compressor, and it hitting the blades giving the flutter, which I love.

Edited 08/04/04 07:15 AM by Goose

[ms700]

but if it was a flutter than some of the air in the system would have been going backwards through the compressor, and it hitting the blades giving the flutter, which I love.

that's what I was trying to say!

that's the noise I reckon it was.

[slapnut]

I sometimes get the BOV noise as well but most of the time I can't hear it, which is a shame.

I was thinking that something mut be wrong.