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Thread: 2014 300c 5.7 dyno tune

  1. #1
    Senior Tuner 04silverado6.0's Avatar
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    2014 300c 5.7 dyno tune

    Trying to dyno tune a 300c. Baselined 338hp on a diablosport tune, going to the stock tune went up to 345hp, My best tune was 348hp. Where is the power at? Ive tried leaner, more timing, moving the exhaust cam both ways, everything looses power vs what i have.
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  2. #2
    Senior Tuner 04silverado6.0's Avatar
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    Forgot to mention, cai, shorty headers, catback.

  3. #3
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    what are you using for fuel?

    *email me a log if ya dont want to post it
    Last edited by LilSick; 4 Weeks Ago at 08:37 PM.
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    don tanklage

  4. #4
    Senior Tuner 04silverado6.0's Avatar
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    Running 93 octane. Ill get back with some logs.

  5. #5
    Senior Tuner 04silverado6.0's Avatar
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    The log with stock timing picked up about 2hp, tune 3 gained about 1hp more. Tune 2 had more spark advance and did not do as good as 3.
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  6. #6
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    you are not logging knock voltage or knock retard - very important to do so with a mopar hemi on pump gas

    the reason it made less power on "tune 1" is that dip in timing at high rpm

    looks like the pcm saw voltage there and pulled the timing back 4 or 5 degrees

    see the dip?


    compare that to the stock log... looks like it saw some voltage around 4600 in that one, pulled a couple deg there, then ramped them back in and the timing held til you lifted

    on the stock log the t stat was not open yet (its a 203?) and ECT was 190 at the hit... compared to the tune 1's higher temp

    closer to 210

  7. #7
    Senior Tuner 04silverado6.0's Avatar
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    I went back out this morning and checked my logs and noticed the coolant temp difference. Picked up 5hp peak and more through the curve.

  8. #8
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    your fan tune needs work... you have low speed fan at at higher temp than high speed fan!

    and there is no hysteresis for any of it

    i have seen fans fail because of that

  9. #9
    Senior Tuner 04silverado6.0's Avatar
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    Good catch on the fans. On my end it was showing around 32F for hysteresis. Aside from the enable temps being butchered the hysteresis was a hpt glitch.

  10. #10
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    you gotta use native values with dodge

  11. #11
    Senior Tuner 04silverado6.0's Avatar
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    This wasnt my first hemi maybe just the first time for this os. Still learning on these but not much info is out there compared to chevy. This was my first dyno tune on a hemi.