Wastegate question

[Jettage1]

On my ECO K14 turbo setup, there's no BOV, but I believe there is a wastegate - down below the turbo.  It has a threaded shaft with a hex (allen key) opening on the end of it and a locknut.  If I wanted to increase boost (raise the wastegate opening pressure), am I correct that I need to turn the threaded shaft inward (clockwise) ? 

If so, I assume that  when one can't turn it further in, it is essentially locked closed (max boost, no relief) Is this right?

Thanks!

[anto]

Yes thats how i do it on my k14.

[Jettage1]

Okay, not too be too clueless here, but is it actually a locknut on the threaded shaft?  I tried pretty hard to loosen it while holding the shaft with the allen wrench, but nothing.

More elbow grease?  or am I doing something wrong?  (I've learned to double-check before blindly charging ahead...)

Thanks in advance.

[anto]

Is there an alternative i could use to regulate boost further?

At the minute i have the threaded shaft all the way in, 26psi max on a 1.9 turbo diesel peugeot 306.

Ive noticed what you descirbe andrew but until now i hadnt understood why it did it, i thought it was designed to do that. Previously had it around 21psi but in 5th flat out it would rise to 23psi, something it wouldnt do in 2nd/3rd for example, was i experiencing what you describe?