I can bring my experience on the injection pumps mechanical timing advance centrifugal antipas, the start of injection and rpm increases....this system does not allow a calibration as the modern diesel engines with electronic, and then when you do a nice p? of diesel to not have high smoke; hence, and the temperature of the egt is very high advance physically to the injection pump by a few degrees only, that being the system to change fixed to a minimum I feel the engine beat, while at high speeds, this not happens and I get as far as wanted, i.e. lower smoke; hence, and egt in the norm now and the fact that with an ecu wishing we could play with the advance payments, for making a engine that we want to...the problem is in the get them and try,and try again, maybe better on a test bench,until the result does not satisfy us for? in this, according to me, mathematics is cipu? help for the less not to go crazy when you bring furi road with evidence of the bad practice..cio? if in a given engine the builder decreed that for brucire tot diesel we want tot advance why can't we use a p? his work calcolandoci the road from percorerre?