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Thread: Fuel pressure vs ifr

  1. #1
    Tuner in Training
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    Sep 2019
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    Fuel pressure vs ifr

    Hello all!
    Having trouble trying to find an answer..I have a swap which is using a dead head system running 2000 LS1 injectors at 70 psi fuel pressure.. how would i adjust my ifr table to compensate with the higher fuel pressure ?
    Thank you for your help

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    Use a calculator, should be straight forward.

    https://www.witchhunter.com/injectorcalc1.php

    Put 58psi for old, 70 for new. The flow rate at 58psi, then hit calculate.

    I'd just run the GM spec fuel pressure so you don't have to change anything. Or get larger injectors if you are trying to squeeze more from small injectors. Running more fuel pressure could change how the injector works when that's 12-15psi over what they are rated for.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuner in Training
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    Sep 2019
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    Ok great thanks for the info

  4. #4
    Tuner in Training
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    Sep 2019
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    How would I scale that in the ifr table with a dead head system..? I find my new flow rate is 30.8lbs/hr which converts to 3.88grams/sec.. but i would need a linear scaling due to no frpr