This is going to be a 4 part series explaining Idle Routine and how to calibrate it on the Gen IV GM controllers.
Idle Routine Tables Explained (Gen IV E38 / E67)
Preface:
This post is a breakdown of how the idle routine tables work, specifically for Gen IV E38 / E67 controllers. The same logic often applies to E40 and E92. Screenshots are from EFILive, but the tuning suite does not matter — we are working with the controller itself.
Idle Torque / HP concepts
Torque output at idle follows this rule:
Torque Produced − Torque Load = Torque Output
More torque + less load = higher RPM.
Torque = Airflow + Fuel (adjusted by ignition timing).
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