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Thread: Economy tune / Lean TuNE V8 Gen5

  1. #21
    Advanced Tuner Obsolete489's Avatar
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    That sounds about perfect. Thanks
    2000 K2500 - 489 CI Vortec w/ comp XE270 cam - 0411 swap and rear mount turbo
    1972 M35a2
    2011 LML Duramax

  2. #22
    Tuner
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    Quote Originally Posted by Russ K View Post
    I lean out the closed loop AFR. Set the Max Rich/Lean to 200 MV (ECM 2519)

    Russ Kemp
    What are the downsides to doing this? Do you know what this approximately equates to for AFR?

    Thanks in advance!

  3. #23
    Senior Tuner TheMechanic's Avatar
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    Quote Originally Posted by lucas287 View Post
    What are the downsides to doing this? Do you know what this approximately equates to for AFR?

    Thanks in advance!
    16:1 or close to it. Downside is potential hesitation or even misfire if it gets lean enough.

  4. #24
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    ^Thanks! For the last couple days I've been rolling around with these settings:

    Lean.JPG

    I don't notice any adverse effects yet, just great highway fuel economy. Didn't see much KR. Averaged about 23 MPG vs the usual 20. (pretty good for a CCSB 4x4 L86)

  5. #25
    Did you retune maf a little bit on cruise and low throttle parts ?


    Quote Originally Posted by lucas287 View Post
    ^Thanks! For the last couple days I've been rolling around with these settings:

    Lean.JPG

    I don't notice any adverse effects yet, just great highway fuel economy. Didn't see much KR. Averaged about 23 MPG vs the usual 20. (pretty good for a CCSB 4x4 L86)