Originally Posted by
joecar
You can define/add calc pids to an already saved log.
1.
there is a dx() function that is available for calc pi usage;
it calculates the numerical derivative/slope wrt time (i.e. rate of change) of the pid you specify;
e.g. dx({SAE.VSS.mph},6) calculates the rate of change of VSS over the last 6 data frames;
it is described in the scantool user manual pdf.
2.
look at the pid GM.INJFLOW.gps
I have a MPG calc pid: "{SAE.VSS.mph}/{GM.INJFLOW.lbpm}/{CALC.INJDC1}*100/60/8*6.073"
see attached calc_pids.txt file (rename it to calc_pids.txt and place in folder User Configuration, or otherwise merge into existing calc_pids.txt file there).