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Thread: Exceeding Spark Airmass in tune

  1. #1
    Advanced Tuner NJ_Phil's Avatar
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    Exceeding Spark Airmass in tune

    First off, I'm assuming the cylinder Airmass channel in the scan = spark airmass in the tune.

    The only place I see in the tune that uses spark airmass is the spark table which I have scaled to max out at 1.52 g/s but I'm seeing 1.70+ in the scanner.
    I don't want to adjust spark beyond 1.52 and assume it will just maintain spark at the 1.52 setting but do other parts of the tune need to see it scaled higher?

    In other words, should I scale the vertical axis for the spark tables to 1.80?

    Thanks
    2012 C6 Base, Kooks 1-7/8" LT, Catted, NPP
    Novi 1500SL, 10% OD IW, Big Blower Cam, Flip Drive, 2x Alky, ID1000
    Nitto NT05R 305x19, 255x18 on CCW T10s
    Self built and tuned https://www.youtube.com/watch?v=Kod2UTqrVwM

  2. #2
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    i have the early e38 that cant change the airmass in the spark table im stuck at 1.36 and i see the mid 1.8's and havnt noticed any issues just sits at the final row values, reminds me i should update my ecu to one with more features

  3. #3
    Tuner in Training
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    I personally like to have control of my spark curve in the higher region of my cylinder airmass even if that means drawing out the intervals larger than in lower airmass areas.

  4. #4
    Advanced Tuner NJ_Phil's Avatar
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    Quote Originally Posted by CWG0816 View Post
    I personally like to have control of my spark curve in the higher region of my cylinder airmass even if that means drawing out the intervals larger than in lower airmass areas.
    Thanks... For now, I just "slid" the Airmass rows up 2 places and added 2 new rows at the bottom which get me to 1.80.
    Probably going to redo it as you said.
    2012 C6 Base, Kooks 1-7/8" LT, Catted, NPP
    Novi 1500SL, 10% OD IW, Big Blower Cam, Flip Drive, 2x Alky, ID1000
    Nitto NT05R 305x19, 255x18 on CCW T10s
    Self built and tuned https://www.youtube.com/watch?v=Kod2UTqrVwM

  5. #5
    Senior Tuner Lakegoat's Avatar
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    How do you "add" extra rows to get to 1.80 from 1.36 in my E40?
    2000 Camaro SS 2015 L83 port injected, Whipple 3.0, 4L80E, 8.8 Ford
    2013 Silverado 5.3, 6L80k 8.8

  6. #6
    Tuner in Training
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    You can't add additional rows- you can shift the y axis intervals to open up a row. ie. {1.36 1.28 1.2} Replace 1.2 with 1.25... replace 1.28 with 1.35 and then replace 1.36 with 1.5. etc... <---- Just an example- I would spend some time analyzing your data to best determine the intervals based on that specific build/tune.

    Quote Originally Posted by Lakegoat View Post
    How do you "add" extra rows to get to 1.80 from 1.36 in my E40?
    Last edited by CWG0816; 10-30-2017 at 01:01 PM.

  7. #7
    Senior Tuner Lakegoat's Avatar
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    Thanks!!
    2000 Camaro SS 2015 L83 port injected, Whipple 3.0, 4L80E, 8.8 Ford
    2013 Silverado 5.3, 6L80k 8.8