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
The amount added is not in %, it addad pulse width so your 40 is an added 40ms pulse widthYes i too realised that the duration was in seconds, but i remember cliff or dnb saying something before i realised this, so at least i had it in the back of my mind.In comparison, the addad PW values i am using at 1.2s duration are 0.1, 0.2, 0.7 and 3.0, so it realy does depend on the required fuel calculation