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Thread: hard start 18 zl1

  1. #1

    hard start 18 zl1

    having a hard time getting my 18 zl1 started and idleing. it has a ported blower, heads, cam, and 5in intake. i keep bumping up the base airflow, cranking fuel, and adding 20% from 5000hz and below for the maf scaling with little improvement. any tips or advice? its in maf only mode. will attach tune
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  2. #2
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    larger intake would mean the MAF frequency would decrease. Try going the other way

  3. #3
    Senior Tuner Ben Charles's Avatar
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    Larger inlet you INCREASE the MAF since it effectively lowers the Hz for a given volume.

    Cam setups need a lowered VT and VVE.. cranking VE as well

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  4. #4
    Quote Originally Posted by Ben Charles View Post
    Larger inlet you INCREASE the MAF since it effectively lowers the Hz for a given volume.

    Cam setups need a lowered VT and VVE.. cranking VE as well
    how does that play in to which parameters to change?

  5. #5
    Senior Tuner Ben Charles's Avatar
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    Decrease values in cranking VE
    Decrease VVE in idle regions
    Decrease VT below 1200rpms (this is vague but in the right direction)

    You mentioned you increased airflow (which is needed) but everything is calculated on this ECM so needs above adjusted

    Email Tunes, [email protected]
    96 TA Blown/Stroked, 4L80E/Fab 9
    15 C7 A8 H/C 2.3 Blower/PI
    14 Gen 5 Viper
    Custom Mid Engine chassis, AKA GalBen C

  6. #6
    Quote Originally Posted by Ben Charles View Post
    Decrease values in cranking VE
    Decrease VVE in idle regions
    Decrease VT below 1200rpms (this is vague but in the right direction)

    You mentioned you increased airflow (which is needed) but everything is calculated on this ECM so needs above adjusted
    what is vt?

  7. #7
    Senior Tuner Ben Charles's Avatar
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    You might be better off paying someone

    Email Tunes, [email protected]
    96 TA Blown/Stroked, 4L80E/Fab 9
    15 C7 A8 H/C 2.3 Blower/PI
    14 Gen 5 Viper
    Custom Mid Engine chassis, AKA GalBen C

  8. #8
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    Quote Originally Posted by Ben Charles View Post
    You might be better off paying someone
    LOL.

    And yeah, I had just got off work, wasn't thinking clearly