Originally Posted by Kitch 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
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