Defender 300 Tdi weird noises under boost

The first noise you hear on the video started a while ago, maybe back in May or June, but it goes away so quickly I never thought it to be an issue tbh thats more like a wooshing sound, but yesterday that high pitch noise (almost sounds a bit like speaker electrical buzz occurred) Only under high boost like when you plant your foot down to the floor If you drive it normal you never get it.

The turbo to me seems fine, video of the innards below little bit of side-to-side movement, but in and out movement is solid doesn't move at all. The hoses look all fine too most were upgraded to silicon when I first bought it. We did do the head gasket back in March and all other gaskets where replaced, so wondering if its the manifold gasket at this point? perhaps the new gasket has failed? What does anyone else think? The car still drives normally maybe a little bit more black smoke out the back if you thrash it, but nothing ridiculous and no real loss of power either.

Video of the noise here -

Video inside the turbo here -


Opinions I just don't know what the high pitched whistle is or the whooshing sound when accelerating

First video I cannot hear anything out of place, 2nd video says private?

lynall said:

First video I cannot hear anything out of place, 2nd video says private?

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Its very noticeable in the first video. If you are listening through a mono device that could be why it might not be heard?

The screechy whistling sound starts about 3 seconds in then again at 12 seconds in.

Second video plays fine for me though can anyone else confirm?

ryan_1993 said:

Its very noticeable in the first video. If you are listening through a mono device that could be why.

The screechy whistling sound starts about 4 seconds in.

Second video plays fine for me?

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2nd video now working.
If screeching then you have a gasket/hose/or split intercooler.
Quite a simple system so should not be hard to find.

As @lynall says there is a hole somewhere where the high pressure (compressed) air is escaping.
When mine did that it was the 90 degree bend hose clamp as it left the turbo, pushed it on a bit further and it's been fine since.

miktdish said:

As @lynall says there is a hole somewhere where the high pressure (compressed) air is escaping.
When mine did that it was the 90 degree bend hose clamp as it left the turbo, pushed it on a bit further and it's been fine since.

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Noticed until its not at temperature it doesn’t do it when its at temp the noise happens if this narrows it down?

ryan_1993 said:

Noticed until its not at temperature it doesn’t do it when its at temp the noise happens if this narrows it down?

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Yes to me that would indicate exhaust/inlet gasket failure.

Or it could even be the ex manifold slip joints themselves, if it is them there will be some black soot showing as evidence.

lynall said:

Yes to me that would indicate exhaust/inlet gasket failure.

Or it could even be the ex manifold slip joints themselves, if it is them there will be some black soot showing as evidence.

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Could it be the exhaust flexi hose section at all there is quite a bit of sooting on that to be honest and the mesh is breaking down

ryan_1993 said:

Could it be the exhaust flexi hose section at all there is quite a bit of sooting on that to be honest and the mesh is breaking down

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Could well be, I had the same on a td5 disco once, took me an age to suss the flex was duff.

lynall said:

Could well be, I had the same on a td5 disco once, took me an age to suss the flex was duff.

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I might just temporarily wrap it in aluminium foil tape or something see if the noise still occurs