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Thread: Boosted LQ4 with 80 Lb Deka 110324 injector help

  1. #1

    Boosted LQ4 with 80 Lb Deka 110324 injector help

    Hello All, I have an LQ4 with ECS 1500, LS6 intake and 80 Lb Deka 110324 injectors, I am not boost referenced. I am having an issue with running out of fuel (exceed 80% of injector at 5663 RPM AND 100% AT 5980 rpm) log attached). I'm looking at the injector data details in the tune and am not sure my tuner scaled it correctly looking at the IFR vs KPA table. Tune attached. Can someone tell me if this current tune is correct as I have 58 PSI at the rail, and it looks like this config is for 43 PSI.

    Any help appreciated.
    Attached Files Attached Files

  2. #2
    Senior Tuner
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    Injector data is important but isn't going to cause it to act like its out of fuel.

    I'll just about guarantee this is actually out of fuel pressure. Tape a fuel pressure gauge to the windshield and run it to WOT to check for sure. That linear climb in AFR is a very solid tell that it's loosing fuel pressure.
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  3. #3
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    The data:
    https://forum.hptuners.com/showthrea...l=1#post796064

    Set Fuel>Transient>MinFuelMg to 0.010. >Fuel Delta Min Increase to 0.0012. >Fuel Delta Limit to -0.0015.

    58psi.

  4. #4
    I do have the ECS Stage 1 380LPH fuel pump operating off a hob switch. This should be good to over 850 RWHP. Im going to take the Left wheel well liner out and check the vacuum and power and see if I have a problem. Im also looking at fuel pressure sensor i can plug into my Holley Fuel rail and run it to a gauge with a min max hold feature.

  5. #5
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    Quote Originally Posted by [email protected] View Post
    I do have the ECS Stage 1 380LPH fuel pump operating off a hob switch. This should be good to over 850 RWHP. Im going to take the Left wheel well liner out and check the vacuum and power and see if I have a problem. Im also looking at fuel pressure sensor i can plug into my Holley Fuel rail and run it to a gauge with a min max hold feature.
    This type of thinking is flawed. It has x pump so it should be enough doesn't account for issues with the install or bad parts.

    You will not know until you directly test that it has fuel pressure at WOT/heavy load.
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    Email tuning!!!, Mail order, Dyno tuning, Performance Parts, Electric Fan Kits, 4l80e swap harnesses, 6l80 -> 4l80e conversion harnesses, Installs

  6. #6
    I said i was going to install more than just a gauge on my fuel rail. Im going to put a sensor there and run it to an electronic gauge in the cockpit. This will show me FP at WOT.