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Originally Posted by sperry
I hope you didn't pay him hourly... 'cause all that "fine tuning" is worthless the next day you drive the car, since the temperature is different. Or a month later, since the VE of the motor has changed a little due to wear. There's a reason the ECU has learning algorithms... it self fine-tunes.
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That's a very simplified descripiton. You and I both know the ECU is given targets to hit for AFR's, timing, and boost. Fine tuning those targets is the difference between a tune that is constantly causing knock or a lean condition, and one that the engine responds magicly too...regardless of the environmental conditions.
Just let go of the hate.