Sure. Remove cap on top of diaphram. Adjust screw clockwise a little at a time. Check for smoke at full throttle before boost comes on with the engine at full temperature. Adjust to the smoke level that makes you happy.....
It is a fairly safe adjustment as EGTs don't come high until you are full on boost.
Megatopic here: http://forums.lr4x4.com/index.php?showtopic=31&hl=
