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I forgot to add above that, with this type of boost controller, you must make sure the lever applies firmly on the limiting screw and not be "just at the limit" ( and therefore more than with a dawes -needle arrangement ). Reason being that, as soon as you press the throttle, the positive flow injected from the boost line will open the vanes immediately although the turbo has not really started to spin at the right speed. Closing a bit more the 'spool-up' side will allow this effect to be sort of "compensated".