I was just wondering after looking at the NGK AFX AFR PID within the scan tool, does it need to be corrected for stoich value? My LS1 Vette has a stoich value of 14.63 and the wideband O2 has a stoich value of 14.57. I know the difference in reality is 0.4% but would that make a big enough difference? Should the following PID information for the NGK AFX be something like...

AFR = {EXT.AD1}*1.4+9 *(14.63/14.57)

Here is the default PID...


Wide Band AFR 1 - NGK AFX {CALC.AFR_NGK1}

Expression:
AFR = {EXT.AD1}*1.4+9
is VALID


Also, if I do need this change how can I edit the PID or do I have to recreate another PID for the NGK AFX AFR? Thank You!