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Thread: 25320287 21.8 lb injector with returnless/ vette style regulator flow rate vs kpa vac

  1. #1
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    25320287 21.8 lb injector with returnless/ vette style regulator flow rate vs kpa vac

    does anyone have injector data for these running a returnless setup? thanks

  2. #2
    Tuning Addict 5FDP's Avatar
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    Look up a stock 1999 Silverado file from a 4.8 or 5.3 truck in the tune repository. Those should come with those 22lb/hr injectors.
    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.

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    they do but they also have the vacuum referenced regulator on those trucks, they are 21.8 across the board. thanks for the reply

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    Tuning Addict 5FDP's Avatar
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    Off hand I am not sure there is a factory calibration with the data you want then.

    You can do what many do and just make your own and it'll be super close. Like mimmik the flow rate of like calibrations, say it started at 20.5 and ended at 23, then interpolate to get your values.

    For example my old 2006 sierra runs 25lb/hr injectors. The flow rate starts are 24.5 and ends at 27.1, the data in the middle is interpolated.
    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.

  5. #5
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    I was thinking that's going to be my only option, thanks for backing it up