3L CRD Turbo busted or leaking

[Hodge]

Since buying this car, it's had this extra noise on top of your normal clean turbo whistle. It's difficult to explain exactly how it sounds like, but it's more of a air gushing sound like it's got a high pressure leak or something like that. The car however, drives and feels fine, plenty of power. I haven't noticed any power loss or anything.
It happens when turbo spools up and under even a bit of load. I'm not 100% sure, but I "think" it happens when the car warms up a tiny bit. This may or may not be correct.
Now the interesting bit...
I've just had a 2. 75 beaudesert exhaust fitted, and noise is still present, it's not louder or quieter, but now somettimes just above 2000rpm, when I step off the foot, I can hear a howling type sounds, almost like a stretched out owl call. Mate reckons it's coming from the back of the car but unsure.

Had the guys who fitted the exhaust take it for a drive after and they cannot believe how much power the car has, but cannot put a finger on what and why that noise, over the turbo whistle is.
I'm gonna take it to a turbo place and put it on a dyno and they can listen with a steto, but just curious exactly what this could be.

Cannot tell you how happy I am about the power the exhaust gave the car. It's like a different car!!
But this noise now has me a tad concerned.

Any ideas ??? The cars only done 40k on clock, and drive like a new one.

[threedogs]

Does it sound like PITOOOooo. Mine made that noise. still drove ok just that annoying sound.
Ended up being cracked dump pipe just behind the turbo, you can check with torch

[Hodge]

Can't be dump pipe since it was there before exhaust and the whole system was just replaced including a new d pipe. Cannot explain how it sounds in words. It could be like air leak from a hose out of a compressor but not sure.

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[threedogs]

Ok are all your hoses connected as they should be IYO
or is it more on the exhaust side of it, just trying to trim it down
do you have locker fitted???

[Steve4wdin]

Have you got a snorkel fitted?

[threedogs]

What about a warped manifold, When you back off get a squealing noise ??
Edit re read your post and think your intake manifold is warped, as you mention it changes once warmed up.
And not uncommon on the ZD30 either

[Hodge]

Thanks for the ideas. Will get it all sussed out properly by the mechanics on dyno. Hopefully tomorrow afternoon.
As for your questions, yes I do have a snorkel. But the noise was there prior to it being fitted. Not long ago mate suggested it could be a exhaust leak on turbo side, so I waited for the exhaust to be fitted, which made no differerence.
Mechanic took it for a drive earlier as well and he reckons nothing to be worried about, but better to have a closer look.

[Hodge]

Sussed out whether it makes a difference once engine is warm, I don't think it does. It appears to be there from the moment you take off.

[threedogs]

Nothing to do with EGR piping?
Interested to find out what this noise is,
hopefully nothing major eh

[Hodge]

Yeh will be very interesting. Not sure to look or not to look forward to whatever the mechanic finds out.

Edit: I'm pretty confident it's something to do with the turbo spooling up, because the noise is very consistent with it spooling up and it goes in-line with the turbo whistle.

[Hodge]

OK just came back from having the patrol on the Dyno. They had a stethoscope all around the turbo and turbo seems and sounds just fine. Noise was so minute that it was very hard for them to pin point exactly where it was. If it was anything he reckons it would be a very tiny exhaust leak. Nothing of concern, but should be addressed if it gets any worse.

On a positive note, I can't describe how much more power and smoother spool up this thing has now. The exhaust gave this car a new life.

[threedogs]

What kinda KW you pumping out

[Alitis007]

Does the noise happen between shifts ?? I cant help but think its only the pressurized air from the turbo escaping when your foot is off the accelerator.

[Hodge]

Does the noise happen between shifts ?? I cant help but think its only the pressurized air from the turbo escaping when your foot is off the accelerator.

Definitely not during shifting George. Pretty much only during spool-up/turbo load. The other owl type noise that I described happens when I take foot of the pedal, but not the air-escaping noise.

[Steve4wdin]

Does the noise happen between shifts ?? I cant help but think its only the pressurized air from the turbo escaping when your foot is off the accelerator.
I agree with you on that. With new exhaust it may be even louder.

[threedogs]

I take it you never got a print out Strange

[Hodge]

I take it you never got a print out Strange

Nah mate. I don't think they even had the computer set to log data. Car was on the rollers purely to put under load so they can listen to things under the hood.

[Stropp]

Split in the intercooler

[Hodge]

Split in the intercooler

Now that would be bad. Water in engine and all...

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[Stropp]

nah mate if the intercooler is split just compressed air coming out which makes a whistleing sound or a air noise, no water in the intercooler unless its fitted with a water to air jobby.

[Hodge]

nah mate if the intercooler is split just compressed air coming out which makes a whistleing sound or a air noise, no water in the intercooler unless its fitted with a water to air jobby.

Understood mate, what I was more inclining to is, bonnet scoop, rain or car wash, water gets in through crack if any, and gets blown straight into engine. I was told generally there would be oil residue around where the crack/split is. There is none on my car at all. And the sounds is more sort of deeper/growling air type rather than high pitched whistling sound.

[Hodge]

Resurrecting this thread for further opinions as I'd like to get this issue sorted.
When I was over at Mudskis the other evening, he mentioned that there sometimes seems to be a tendency for the EGR tubes to warp on the Di's. I couldn't find any info on this happening on the CRD's.
But, I read somewhere there is a electrical EGR plug you can disconnect to test this ages ago, but I cannot find this thread now. Engine light will come on until it is reconnected.
Where is this plug and I'm assuming this controls the EGR valve, and leaves it in closed state if plug is off? Also I would get same results if the EGR was blocked off?
The EGR tube looks like a freakin' PITA to get to,let alone remove, so I'd love to test this theory before getting it looked at and/or ripped apart my self.

[kevin07]

when you take your foot off and it sounds like an owl hoot that's just the turbo breathing easier with the new exhaust

[Hodge]

when you take your foot off and it sounds like an owl hoot that's just the turbo breathing easier with the new exhaust

Yeh cheers mate. Was in an undercover car park the other day, and when it made that sound through the snorkel, it startled a few people near by. lol