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Thread: Commanded AFR

  1. #1

    Default Commanded AFR

    Just out of curiosity, what are you guys with dashhawks seeing at idle.. when the car is warmed up.
    PID should be CMD AFR or commanded AFR from memory.

    I occasionally see 14.5.. but normally 14.6.

    Possibly its dropped into the 14.5's due to colder weather.. just something ive not noticed before

    My LTFT's are spot on at +1.6% -0.8% and -1.6% under light to moderate load
    0.0% under WOT obviously

    Thanks guys.. appreciate the heads up

    Doc

  2. #2
    Join Date
    May 2009
    Location
    Sunshine Coast Qld
    Posts
    749

    Default

    Doc u still running stock tune? . Will check later the CMD AFR on mine for u.
    Your LTFT figures are at idle i suspect, and if so they are great, Mine at idle are approx +7.5 to +5.5 . Yes your 14.5 should be due to denser air at the moment.
    My light throttle at say 90 to 100 klms are +4.9.
    Typical pig rich. Ha Getting a tune soon so then i can compare.

  3. #3

    Default

    im on the stock tune at the moment mate..

    LTFT at idel is +1.6%
    at light load its -0.8%
    and moderate (closed loop still) load its -1.6%

    open loop WOT its 0.0%

    would appreciate what your commanded AFR is..

    keep a note of it.. I want to see if it changes after Chris releases his gen 2 DP fix..

  4. #4
    Join Date
    May 2009
    Location
    Sunshine Coast Qld
    Posts
    749

    Default

    Doc mine are as follows, engine up to Temp 189F Idle speed 700rpm CMD AFR 14.3/1
    Your figures are bloody great.

  5. #5
    Join Date
    Nov 2008
    Location
    Brisbane
    Age
    47
    Posts
    3,387

    Default

    14.6 here

  6. #6

    Default

    thanks guys

  7. Default

    Why commanded?

    ISn't actual more important? Won't everyone running the stock ecu with all updates be running the same commanded AFR?

  8. #8

    Default

    commanded is usually actual.. but im looking into the reasons why it commands a richer idle.. i have a good theory which ties a few things together.. but ill talk about it when I have it all together..

    Doc

  9. #9

    Default

    I have commanded and actual on the same display and find they are almost always identical (presumably because the response to commands is rapid?). Anyway, last weekend it was 14.81 with the trims at 1.6 and 0.0 and today it was 14.46 with trims at 3.6 and 9.4 (I think, from memory). Engine was running sweet and pulling much stronger than usual today. Wish I knew why cos I'd keep doing it.

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