Thread: Secondary turbo shut off valve

Has anyone had an issue with their P/N LR043939 Compressor shut off valve, otherwise know as the Secondary Turbocharger Recirculation & Shut off valve?
On the 3.0 D4 Secondary Turbo.

My problem is that when accelerating briskly, as soon as I reach 2400 rpm when the 2nd turbo comes in I hear a one-off loud very short/quick/brief cracking noise identical to the noise a whip makes when cracking it.
It appears to be accompanied by a very brief hiss rather like when a wastegate on a "hot" Subaru WRX goes off.

I need to confirm which I'll do in next few days, but I think that by accelerating gradually I can 'drive through' the rev range and get over 2400 without the whip crack. Either that or the noise is not so prominent as opposed to accelerating briskly when overtaking a vehicle or changing down to go up a hill which quickly sends the rpm over 2400.

FYI, I finally got to the bottom of the problem.

The exhaust pipe exiting the 2nd turbocharger has a crack around its flange.

Stainless steel so not worth risking a repair as no one will guarantee it.

Ordered a new pipe assembly, the Genuine was cheaper than aftermarket.
Not too bad a job to do considering.....

Approx $1300 ex LRA Melbourne.