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Thread: 2012 Chevy Sonic 1.8L (My daily MPG beater)

  1. #1
    Tuner in Training
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    Mar 2020
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    2012 Chevy Sonic 1.8L (My daily MPG beater)

    I've got a couple of questions, since I mostly deal with the LS based stuff. I thought about trying to minorly improve on things tune wise with the daily beater. I pulled the file, and noticed something odd.

    Anybody know why the Stoich scale goes from 14.31982 @ 0% to 9.38770 @ 100% alcohol content?

    Why is the high rpm disable on dynamic airflow @ 7000rpm? Limiter is 6750 (it's set up to never run maf only at high rpm, but rather dynamic the entire time)

    Is a 20% desired slip really necessary on the TCC? Thinking of lowering this for efficiency reasons, but I don't want to cause a shudder issue


    I have attached my stock file for review
    Attached Files Attached Files

  2. #2
    Senior Tuner cobaltssoverbooster's Avatar
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    Dec 2008
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    4,352
    because todays pump fuels have some small quantity of ethanol in them already they just automatically target the lower stoich particularly if the vehicle doesnt have a physical sensor and relies on fuel error to determine a virtual percentage. Likewise actually getting 100% is almost unheard of unless you make it yourself or buy it from a facility with high grade distillation practices. I make my own from home when the summer heat starts to target the 85* plus temp ranges. My race motor prefers a little splash of alcohol to cool it back off an maintain consistent power at the track.
    Ethanol-Percentage-Air-Fuel-ratio-table.JPG
    2000 Ford Mustang - Top Sportsman