When asking for technical help at the very least let us know the version of firmware you are running.Cliff's Calibration (Mapping) Guide is a MUST READ: http://www.vemssupport.com/forum/index.php/topic,97.0.html
Now at 1.5bar it´s also now got the variable boost control function working nicely.a 0-5k ohm resistor with a 5v feed makes adjusting boost real nice and easy from inside the cockpit.