Surging blow off valve noise on a diesel?!?

[enkeivette]

Had an interesting diagnostic day today. Ive had a P0299/ ETC light issue that Ive narrowed down to the electronic turbo actuator. (I think) Anyways, I drove it around after trying one last thing before I send the actuator out for a rebuild... and I heard what sounds like a BOV surge.

Now first of all, diesels usually dont have throttle plates and thus no need for a BOV. So what the hell is this?!?

I took a video at night while brake torquing, listen and let me know if you have any ideas/ an explanation.

http://s712.photobucket.com/user/enkeivette/media/5A1A477D-10BA-4EAC-B2C6-FE36EBB328F1-983-00000078D623A14E.mp4.html#/user/enkeivette/media/5A1A477D-10BA-4EAC-B2C6-FE36EBB328F1-983-00000078D623A14E.mp4.html?&_suid=1364548017989032810244451867515

[Shaolin Crane]

It's called turbo fart, my turbo made similar sounds at high boost and right before it exploded.

[enkeivette]

It's never done that before. And now it does it, when I'm having an issue? Can't be a coincidence.

[enkeivette]

I think the wastegate actuator is failing, causing it to stick open, producing too much boost which is trying to come back out the intake.