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Thread: Flow Rate Kpa question

  1. #1
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    Flow Rate Kpa question

    2004 Z06

    Was switching to new injectors and saw that they were only 24lb injectors, these were the settings for flow rate 82.7 82.7146849934888 83.1487200721652 83.5207501396022 83.5827551508417 83.9547852182787 84.1408002519972 84.4508253081947 84.4508253081947 84.5748353306737 84.6988453531527 85.0088704093501 85.0708754205896 85.0708754205896 85.0708754205896 85.1328804318291 85.1328804318291 85.1328804318291.

    That cant be correct , what issue would this cause?

    Also attached datalog and tune
    Attached Files Attached Files
    Last edited by JS61; 05-27-2021 at 09:14 PM.

  2. #2
    Tuning Addict 5FDP's Avatar
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    All the fueling would be wrong.

    What injectors did you install??

    You need larger than 24lb/hr injectors for a corvette like that.

    The PE table needs to be fixed too. You can't ask for 1.400 EQ ratio, that would be 10.4 AFR.
    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
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    Quote Originally Posted by 5FDP View Post
    All the fueling would be wrong.

    What injectors did you install??

    You need larger than 24lb/hr injectors for a corvette like that.

    The PE table needs to be fixed too. You can't ask for 1.400 EQ ratio, that would be 10.4 AFR.
    This was the tune installed on the vehicle when I purchased it. He was running the 24lb injectors, I am going with deka 60s. Car is also boosted so that needs addressing. Supposedly this was a dyno tune he got at a local reputable shop

  4. #4
    Tuning Addict 5FDP's Avatar
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    Yeah, you'll need to find the proper injector data for those then.

    Then I highly suggest you install the 2 bar OS so you can tune the VE for boost. I'd ditch the MAF sensor and just run speed density only. Then use a 2 bar map sensor.
    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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    It's very possible that those are decapped injectors. You'll need to have them flowed in order to determine the exact flow of them.

  6. #6
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    Quote Originally Posted by kevin87turbot View Post
    It's very possible that those are decapped injectors. You'll need to have them flowed in order to determine the exact flow of them.
    Swapping them out anyway for the 60s

  7. #7
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    Quote Originally Posted by 5FDP View Post
    Yeah, you'll need to find the proper injector data for those then.

    Then I highly suggest you install the 2 bar OS so you can tune the VE for boost. I'd ditch the MAF sensor and just run speed density only. Then use a 2 bar map sensor.
    I updated the eq ratio to 1.25 all the way across, tuned idle and airflow for cam. I have the injector data now but not sure what do with it? New to tuning. These flow at 72lbs at ls fuel pressure

  8. #8
    Tuning Addict 5FDP's Avatar
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    The injector data tells you what it's for.

    There should be data for the Injector Flow rate, Min Injector Pulse, Short pulse adder and the Offset vs volts data. Change all that and you should be set for injector settings.
    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.