Originally Posted by
blueskies85
but he says its struggling after 5.5k, wouldnt a bigger turbo take longer to spool up but keep pulling till redline?
Yes it would!
What exactly do you mean by struggling after 5.5k? If the boost is dropping off it could be your actuator is weak, if it's cutting in and out again i'd change the actuator and make sure your Amal valve is working (if you still have one).
Coming in late could be the timing, it will need to be set for the Kent Cam not your usual 12degress BTDC.