LOUD Whistling/Whining 1.9 130PD

[EdButler]

Hey Peoples - Im posting this on behalf of T. Spark

Basically his car is Whistling/Whining VERY loudly which pitch and amplitude corresponds to the turbo spooling... There is also a degree of power loss (~45bhp) - it is slightly faster than a non-remapped 130PD when his is Phase one with Exhaust and FMIC. Sounds like a broken turbo yes? However!!

• The Turbo seems to be boosting fine (see logs below)
• VAG-COM shows no faults at all

Here is a log of his - looks pretty fine to us! Its Custom Code Phase1

We also did a few little vids so you can hear what it sounds like - its best approximated to a HUGE supercharger - it does sound mint i must admit
http://s46.photobucket.com/albums/f120/eddamoo/?action=view&current=MOV02E.flv
http://s46.photobucket.com/albums/f120/eddamoo/?action=view&current=MOV02F-1.flv

Any ideas? Could it be the turbo, or perhaps a hole somewhere downstream? Cheers!

 

[maxcars1]

does it do it at idle to

 

[EdButler]

No, its in-audible behind the clatter...

Give it a few rpm's though and it whines

 

[gazjones]

i want that problem it sounds ace
could be dodgy turbo or high pitch leak but its not losing boost

 

[maxcars1]

Wonder if theres too much play in turbo shaft

 

[muddyboots]

There is also a degree of power loss (~45bhp)

That's some degree of power loss !

Remember - the boost logs look fine, but any air being lost AFTER it's passed the MAP sensor might not affect the reading, and also the MAF would still be reading a reasonable amount of air going past (just not reaching the engine though).

So perhaps you have a post-MAP sensor boost leak.

The EGR valve is one of the last things in the inlet pipework before the manifold itself. Perhaps the EGR is leaking boost into the exhaust, this might account for the amplified whine as you're hearing it from both inlet and exhaust turbines (this will also be accentuated because of the mufflerectomy...) and also some loss of inlet air flow.

If this was the case, I would expect to see a lot of smoke...

 

[muddyboots]

PS Maxcars1 has a spare EGR but I just bought it off him yesterday

 

[muddyboots]

Also thinking - surely it can't just be an exhaust leak somewhere, as that wouldn't cause such a big power loss...

Oooh I do enjoy a good techy problem to theorise about

 

[T. Spark]

Dont we all! Yes, the car is damn slow but sounds the bomb, im gutted due to lack of power, but it turns sooo many more heads...

Didnt think it would be exhaust problem, as said surely I wouldnt lose so much power? Ive been trying to drive without the turbo incase it blows up! But it sounds mint

Arrrrhhh anymore for anymore?

 

[muddyboots]

I still reckon it might be your EGR.

Do you get any more smoke than normal ?

 

[T. Spark]

I still reckon it might be your EGR.

Do you get any more smoke than normal ?

Nope, my car never really smoked alot in the first place, and Ive been told its like usual, just a little (to show its a derv )

 

[Niall]

How come there is an overboost at +/- 2100 rpm?? Is the difference between requested and actual not a bit high. When my car was mapped, actual and requested where just about the same value.

 

[EdButler]

How come there is an overboost at +/- 2100 rpm?? Is the difference between requested and actual not a bit high. When my car was mapped, actual and requested where just about the same value.

I think the spike is quite normal - its not 'too' spikey, but it does indeed drop after that...

I was thinking the same as you and Muddy though, a slight leak after the MAP could explain that SMALL difference in REQUESTED and ACTUAL boost, but not enough to warrant a Fault Code.... However it doesnt smoke at all really, which has got me really confused!

Just to add - the whine only seems to come from the engine bay area (when its stood still at least) so im assuming something must be leaking somewhere. How about the wastegate not actuating properly?

I know my car produces 1.6 bar near enough on Phase 2, however im sure the older CC1/2 maps were a lot higher boosting than that (wasnt it Stoneyfords that was hitting 1.8/1.9 bar??)

 

[UncleFester]

That sounds exactly like mine did when i ran it around with no backbox and no cat, just straight pipe ....... i'd go with the leak somewhere too.


if you find it and it's not causing serious problems, could you document it so we can all do the same mod? Maybe so we don't lose 45bhp too though

 

[muddyboots]

I was thinking the same as you and Muddy though, a slight leak after the MAP could explain that SMALL difference in REQUESTED and ACTUAL boost, but not enough to warrant a Fault Code.... However it doesnt smoke at all really, which has got me really confused!

Just to add - the whine only seems to come from the engine bay area (when its stood still at least) so im assuming something must be leaking somewhere. How about the wastegate not actuating properly?

Very odd...doesn't add up.

Just to get a complete picture, I'd log:
MAF readings
Fuel & coolant temps
Driver, MAF & Fuel map IQs (might show if fuelling is being limited, and why)

So - if you rev the car with the bonnet up, you only hear the whine from the engine bay, not from the back of the exhaust ?

And the whine lags behind engine speed, rather than follows it exactly ? (IE It's nothing belt driven...)

And finally.....have you checked the oil level ??!!!!

 

[MATT RILEY]

Sounds like a broken turdo fin to me,when you give it a rev does the rubber intake hose try and collaps insted of push out?

 

[devonmikeyboy]

Yep sounds more like the turbo to me. Either a damaged or stuck fine or the bearings starting to go/cease. Check the pipe as already stated plus that there is a good supply of oil going to the turbo. Just a guess mind you but take it in to JBS and let them have a look quick if i was you as if it is the turbo you don`t want metal fragments going though your engine if the turbo does go bang.

 

[T. Spark]

The whine does only seem to be in the engine bay, and even just revving it will whine, not as much as driving.

Does seem to lag a little yes, then hits a peak and stays there (maybe when turbo is fully going for it!?)

Ive lost around 45bhp but it turns loads more heads

 

[muddyboots]

If it's a duff turbo, how come it's still producing enough boost, yet power is down significantly ?

 

[JBS Sales]

I say a damaged turbo blade/fin!

I would have a word with the dealers mate as yours has always had more of a 'whistle' than mine and Eds.