VNT15 1.6td compressor surge? (video)

[hamradio]

So, I know, I know, supposedly compressor surge cannot happen on a diesel.  However, my turbo is making a not so awesome noise.  It is a chirping-barking-ish kind of noise if I rev it up a couple k to build some boost, and then let off, in neutral.  I can also hear it if I'm shifting from 1st to 2nd. 


My vanes are shut all the way until 15 psi, when they open.


The video.  Boost gauge is 0-25 psi.  Hopefully the sound can be picked out over the rattling of some trim.


http://www.youtube.com/watch?v=nUXKkoJ5BLE

[rabbitman]

I watched your video and couldn't hear anything abnormal, hopefully someone else will be able to hear it .

[carrizog60]

the only noise i hear is at idle...

[hamradio]

Ugh, I figured it would be like that.  I can hear it through headphones, but I also know what to pick out. 


I'll try to get something better tonight.  The engine kinda chirps a bit and you can feel it shake through the steering wheel as it goes back down to idle.

[OM617]

My vanes are shut all the way until 15 psi, when they open.

That is your problem. You need to make a system that moves the vanes progressively with the throttle or adjust the screw setting for minimum vane position.