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Thread: Spark drop?? 2012 Coyote

  1. #1
    Advanced Tuner
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    Aug 2006
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    Spark drop?? 2012 Coyote

    Got a buddy that asked me to log his run for him, and captured what seems to be some sort of spark advance drop. Anyone every see anything like this? PCM is suppose to be commanding 24* in these areas, but the spark advance completely drops off during the 3-4 shift, then slowly rises. I posted the log to give you guys a visual of what is going on. Any info is greatly appreciated.
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    2009.5 PBM G8 GXP M6 W/Roof-Self tune, OBX LTs, Kooks axleback, LSA blower, cam,
    Monster LT1-SC clutch, flex fuel, 12 psi [email protected] 1,800 D.A
    2007 TBSS-Self tune, bolt ons [email protected], 1,900 D.A
    1991 GMC Syclone- Self tune/catback 12.8@104, 4,200ft D.A

  2. #2
    You're most likely dropping out of the optimum power table and into other tables that command less spark during the shift. My car does the same thing. You'll need to log those mapped points to see for sure but that is most likely what is happening.

  3. #3
    Senior Tuner SultanHassanMasTuning's Avatar
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    spark drops due to cam timing drops
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