Zd30 VNT Notchy?

[big_fletch]

Over the last couple of days I have developed a problem with my 01' troll.*
Currently I have the vnt screw down a 1/3 of a turn with a moderate spool rate. Whilst driving the boost comes up as normal and stops around 2000-2200 rpm at around 6 psi and the power flatspots. I can hold the throttle flat and will continue like this for a couple of seconds then all of a sudden 12psi and off we go again ( not limp as I don't have too reset the pedal). Egt's haven't changed.
I have replaced the leaking intercooler with an Adrad welded replacement and checked for boost leaks.
I removed the actuator off the turbo and found the vnt arm to be quite 'Notchy'.
Could the actuator be hitting a Notchy point while accelerating and having too build up enough vacume to lift over it which would give me the sudden jump from 6 psi to 12ish where it normally sits? Seems like the turbo vanes are abit sticky if this is possible?

Fletcha

[Sir Roofy]

If its notchy would you be able to see it stick while adjusting
the needle valve and if the vanes seem abit sticky ?might be lack of oil
or pressure just a stab in the dark mate

[big_fletch]

If its notchy would you be able to see it stick while adjusting
the needle valve and if the vanes seem abit sticky ?might be lack of oil
or pressure just a stab in the dark mate

Yer adjusting the needle valve adjusts where the boost freezes in the Rev range which is why I'm thinking it's possibly a sticky vnt

[Rumcajs]

You need to check if at idle the arm moves up to its max position and stays there. If it fluctuates you have vac leak somewhere.

Regards

[Sir Roofy]

Yer adjusting the needle valve adjusts where the boost freezes in the Rev range which is why I'm thinking it's possibly a sticky vnt

has turtle still got his pinch for a day and swap parts