Quote Originally Posted by Kitch View Post
Hi Fast,
In your spark table screen shot what does the Equivalence Ratio refer to?

Air/Fuel ratio

The PE spark adder in a factory black box Vortec PCM is based off of Air/Fuel ratio and RPM.

Soichiometric /Equuivalence ratio =Commanded Air/Fuel ratio

14.1/1.2 = 11.75:1 and 14.1/1.15 = 12.25:1