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Thread: so is 138% injector duty cycle bad?

  1. #1
    Member ace68's Avatar
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    Default so is 138% injector duty cycle bad?



    poor guy :roll:

  2. #2
    EFILive Developer Site Admin Blacky's Avatar
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    Yes, anything over about 90% is bad.
    Paul

  3. #3
    Senior Member VortechC5's Avatar
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    Hmm, I guess that I need to consider getting larger injectors. My 42s are currently hitting 90 - 93%.


    Quote Originally Posted by Blacky
    Yes, anything over about 90% is bad.
    Paul
    02 C5 Coupe - LS7, TSP 265 LS7 heads, ARH, Z06 cat-back, HREs, 3.73 gears, Wilwood brakes, DeWitts radiator

    15 C7 Z5 1 Coupe - stock for now

    12 Avalanche - tune, Corsa Touring

  4. #4
    Lifetime Member mistermike's Avatar
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    How's your fuel pressure holding up? Mine blows, so I'm hitting IDC in the 90's with 60 Lb injectors, where a friend of mine making similar power is in the 40's with a properly functioning fuel system. That having been said, if you're running a Vortech w/ heads+cam etc., I'm guessing you're well over 500 RWHP, so 60 Lb'ers with lots of fuel pressure are probably worth trying. Racetronix.com has a pretty good deal on a matched set of 60 Lb high impedance Mototrons. They can also specifically "mismatch" a set to get about 5% more fuel into #7 and #8 cylinders that tend to run lean with centrifugal blowers and turbos.
    World's First Twin Screw Pontiac GTO
    2004 GTO. Blown H/C 408, stage 3 keyboard, billet tires
    2017 Chevy SS with dead hooker is spacious trunk
    2014 Chevy Cruze. MPG queen with my balls in spacious glove compartment.

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  5. #5
    Senior Member VortechC5's Avatar
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    My fuel pressure is fine. I have replaced my stock pump with a Racetronics pump. I normally see 58 to 63 psi even under full boost.

    I have not dynoed my car. I am guessing that I am putting out about 450, maybe 475 RWHP at my altitude (7000 feet). That corrected to sea level is somewhere in the 610 to 635 RWHP neighborhood.

    The only reason that I can even run 42s at all is because the altitude eats up so much power.
    02 C5 Coupe - LS7, TSP 265 LS7 heads, ARH, Z06 cat-back, HREs, 3.73 gears, Wilwood brakes, DeWitts radiator

    15 C7 Z5 1 Coupe - stock for now

    12 Avalanche - tune, Corsa Touring

  6. #6
    Lifetime Member mistermike's Avatar
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    Wow, having lived most of my life at Lake Erie level, I never realized altitude eats up that much power. Racetronix is great stuff. Unfortunately, there isn't enough GTO business to provide Jack a "carrot" to make a good fuel system for us. It's much worse than the fuel system on the pre-VZ Monaros.
    World's First Twin Screw Pontiac GTO
    2004 GTO. Blown H/C 408, stage 3 keyboard, billet tires
    2017 Chevy SS with dead hooker is spacious trunk
    2014 Chevy Cruze. MPG queen with my balls in spacious glove compartment.

    www.aussiemotive.com

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