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
It works, but not fine.The speed turns from +5 till -15 km/h when i accelerate.i cant use it with gear dependent boost, it jumps sometimes from 3. to 2. gear and so on.....What is to do Thomas