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Thread: smec cal mechanical spark advance question

  1. #1
    Garrett booster
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    smec cal mechanical spark advance question

    So I was running through my cal and I found a setting that may be off, but I'm not sure.

    If you follow these tabs in MpTune

    Idle > special setup > Constant Spark advance when setting mechanical basic timing

    Mine is set to 6 degrees, and every cal I looked at is also set to 6 degrees. But in the table description it says that stock is 12 degrees. I'm curious if I need to bump that up to 12 degrees or just leave it alone.

    Also in the same special setup tab there is the table "open loop enrich factor when setting basic timing"
    Mine was set to 55 and the van always just billows black smoke. Is there any reason I can't just pull the enrichment factor down to the mid 20's, or even just to a zero reading?


    Thanks
    Joe

  2. #2
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: smec cal mechanical spark advance question

    That 6 degrees is crankshaft, which translates to 12* on the spark timing, or at least so I remember. Not sure why it is that way.
    Rob M.
    '89 Turbo GTC
    2.5 TIII swap is here!

    Project LookOwt
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  3. #3
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: smec cal mechanical spark advance question

    Joe there was a default coolant temperature that was set too low in my cal.
    I had a problem keeping Slug running when trying to set initial timing. With temp sensor unplugged it would stumble and run rich.
    You might check that, and make sure its set to around normal temp 195-200F.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.7786@113.04 mph! - Jan 15th, 2017 Fayetteville Dragway, NC)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
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  4. #4
    Garrett booster
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    Re: smec cal mechanical spark advance question

    Rob thank you, at least I know it's normal.

    Wayne, do you happen to remember where you found that table?

  5. #5
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: smec cal mechanical spark advance question

    Joe it was under /Utility/On-BoardDiagnostics/DefaultEngineTemp
    On my cal it had a value of 149F in there. On Rob's adice it was set to 200F
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.7786@113.04 mph! - Jan 15th, 2017 Fayetteville Dragway, NC)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

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