Hiy,I'm building a zetec turbo engine and using a custom inlet,what I need to know is can I get away without using an idle control valve,I'm using omex 600 management,I have heard people mention drilling holes in there throttle flap,if this is recommend what size hole to start with?

 

0.5 mm at a guess. my zetec turbo dousnt have idle controll, but i made a bracke with a bolt to adjust the throttle to make it stay open a bit