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Thread: AC kills my idle

  1. #1

    AC kills my idle

    So I finally have the idle dialed in my fresh h/c/i engine. It's an LS2 with the auto 4 speed.

    Anyway I took it for a test drive today and enjoyed a very smooth idle for the first time, but as soon as I put the AC on it all went to shit. The RPMs were swinging wildly from the 500s to over 800 (700 commanded idle).

    I'm relatively new to tuning, but have figured out how to get the cammed idle to settle down with timing and RAF tables but now am stumped how to dial in when the AC kicks in. I see there are some "AC airflow" tables but don't know how those work. Are they similar to the main RAF table or what? What should I do?

    I've attached 2 logs, one idling with the AC and one without.

    Thanks
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