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Thread: Cruise Timing

  1. #1
    Lifetime Member
    Join Date
    Feb 2013

    Default Cruise Timing

    So how much timing at cruise is too much? I've added about 10 deg to my cruise timing cells so it's now in the 35-38 deg range, and there was a negligible increase in the average MPG at cruise (64-66mph). I'm logging MPG with a calc pid. The increase was about 0.4 MPG which could be caused by other variables. I did however drive the same exact route at the same speed, roughly same outside temp, etc.

    I made a map of MPG versus RPM and grams/cyl airflow (same as spark tables) and filtered out non-cruise data. Is there a better way to see the change in fuel consumption?
    2001 Silverado 5.3L ECSB 2WD T56:
    T76 turbo, Meth injection, 72# injectors, 799 heads, 212/212 114LSA cam, Built 4L80E, 3.42's
    EFILive V1 Commercial, COS5 2-bar SOLSD, AEM wideband

  2. #2
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003


    If you doing lean cruise, take a look at the Holden tunes.

    Map+filter is a good way.

    Also make a map of MPG x LOAD (i.e. engine load) to see if that reveals anything.

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