Turbo sound whoo diagnostic

Bikerguy

friend of mine has as well passat 1.9 tdi 105cv b6


And it does this sound on releasing the gas...doesnt matter if cold or hot..


No performance issues qhat so ever

https://www.dropbox.com/s/boika8o6y5m2f6s/hukacka.mp3


Is it normal?

Mjolnir

Bikerguy wrote: »

friend of mine has as well passat 1.9 tdi 105cv b6


And it does this sound on releasing the gas...doesnt matter if cold or hot..


No performance issues qhat so ever

https://www.dropbox.com/s/boika8o6y5m2f6s/hukacka.mp3


Is it normal?

Has he just recently got it?
Loads of lads love the aul choooooooo in a diesel
Same lads that drive up and down in their town all day everyday

Bikerguy

Mjolnir wrote: »

Has he just recently got it?
Loads of lads love the aul choooooooo in a diesel
Same lads that drive up and down in their town all day everyday

Nope he has it over year....


Is it a faulty turbo or just ok

rizzodun

Pigeon stuck in the engine bay.

They get drawn in there in those diesels by the smell of stale tayto and redbull emanating from the cabin.

Mjolnir

Bikerguy wrote: »

Nope he has it over year....


Is it a faulty turbo or just ok

Just sounds like a decat or straight pipe.
You'd know if there was a vacuum issue in the turbo there'd be an issue with boost.

Mjolnir

rizzodun wrote: »

Pigeon stuck in the engine bay.

They get drawn in there in those diesels by the smell of stale tayto and redbull emanating from the cabin.

you forgot they particularly enjoy the smell of John player, and get blinded by the black smoke emanating for the rear.

Bikerguy

Mjolnir wrote: »

Just sounds like a decat or straight pipe.
You'd know if there was a vacuum issue in the turbo there'd be an issue with boost.

Defo no straight pipe.... or decat....


Its like blow of valve...owl like..sound when turbo release presure.. as in the short sound clip....


So now on serious note... the car has no performance issue or oil consumption.... 0 just the sound....

Car is not smoking at all...

Mjolnir

Bikerguy wrote: »

Defo no straight pipe.... or decat....


Its like blow of valve...owl like..sound when turbo release presure.. as in the short sound clip....


So now on serious note... the car has no performance issue or oil consumption.... 0 just the sound....

Tdi never came with a blow off valve, be fairly easy spot if one was added to it.
Does it make the sound if reved and released while not moving

Bikerguy

Mjolnir wrote: »

Tdi never came with a blow off valve, be fairly easy spot if one was added to it.
Does it make the sound if reved and released while not moving

No..not at all...

Only when driving....under load....more in 2 and 3 gear...then higher speeds.

Mjolnir

Bikerguy wrote: »

No..not at all...

Only when driving....under load....more in 2 and 3 gear...then higher speeds.

not a blow off valve so it would do it when ever boost was built and throttle released .
Hmmm upgraded turbo by previous owner maybe, you should feel a vacuum leak if it was that.

Bikerguy

Mjolnir wrote: »

not a blow off valve so it would do it when ever boost was built and throttle released .
Hmmm upgraded turbo by previous owner maybe, you should feel a vacuum leak if it was that.

There is no power difference between stock...and his...i have b6 as well.... i drove it...mine is stock ....

No leak.... at all... i mean no sound on building boost...only when realeasing the pedal or changing gear...

jimgoose

That is the sound of gas passing the impellor of a variable-vane turbocharger when you lift off the accelerator - diesels don't have "throttles", BTW. Such sounds are largely tuned out by engineers, and sometimes tuned back in again via straight-pipe kits, as in your case. It's quite harmless.

Bikerguy

jimgoose wrote: »

That is the sound of gas passing the impellor of a variable-vane turbocharger when you lift off the accelerator - diesels don't have "throttles", BTW. Such sounds are largely tuned out by engineers, and sometimes tuned back in again via straight-pipe kits, as in your case. It's quite harmless.

Thank you very much

Mjolnir

Didn't they have an issue with sticking vanes actually.
Also we all know I meant the peddle when I said throttle like most Irish call it, same way an American would call it the gas.

jimgoose

Mjolnir wrote: »

Didn't they have an issue with sticking vanes actually.
Also we all know I meant the peddle when I said throttle like most Irish call it, same way an American would call it the gas.

A lot of modern-ish diesels do have these sorts of sticky-tar problems - give it a good shot of Dipetane and redden the hole of it. Also, would that "gas" be gasoline or exhaust gas?

deandean

If the car has been remapped, you can get a bit of a Coo out of it. No harm.