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Thread: Scaling Injectors?

  1. #1
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    Default Scaling Injectors?

    Heres the issue, I had a tuner send to me injectors, I ordered 42lbers. I scaled my Injector Flow Rate {B4001} accordingly however at idle I was maxed +25 LTFT with the following

    LABELS Injector Flow Rate (Lbs/Hour)
    Manifold Vacuum inHg Value
    0.0 42.659334
    1.5 42.969358
    3.0 43.279383
    4.4 43.465397
    5.9 43.775421
    7.4 44.085446
    8.9 44.271460
    10.3 44.581484
    11.8 44.767499
    13.3 45.077523
    14.8 45.263538
    16.2 45.573562
    17.7 45.759576
    19.2 46.069601
    20.7 46.255615
    22.1 46.565639
    23.6 46.751654

    Too get the LTFT at idle in check I scaled them back to the following.

    LABELS Injector Flow Rate (Lbs/Hour)
    Manifold Vacuum inHg Value
    0.0 32.614549
    1.5 32.862568
    3.0 33.110588
    4.4 33.234597
    5.9 33.482617
    7.4 33.730636
    8.9 33.854646
    10.3 34.102665
    11.8 34.226675
    13.3 34.474694
    14.8 34.598704
    16.2 34.846723
    17.7 35.032738
    19.2 35.218753
    20.7 35.404767
    22.1 35.652786
    23.6 35.776796

    I am just not certain what injectors they sent me, and they can't remember anymore what they shipped. I looked at a bunch of tunes from HP Repository and it looks like all 42lb injectors are in the 44-49INHG

    Is there anyway to tell what injectors I have? Whats the proper way to scale IFR {B4001} if you don't know what flow rate they are? By LTFT's at idle? Any help or links are appreciated.
    2000 Corvette Twin Turbo
    2004 CTS-V TVS 1900
    2006 TBSS TVS 1900

    All Tuned by
    Rad Tunes by Troy
    aka Vetteboy2k

  2. #2
    Lifetime Member mistermike's Avatar
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    Is it possible that your fuel pressure is higher than the pressure specified for the injectors?
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  3. #3
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    Default

    That is definitely a possibility, but I don't know that for 100% certain.

    What is the best way to go for scaling the injector flow rate?

    Do what I did and just scale them till ltft's are 0 to -1 at idle?

    Just say my fuel pressure is higher than the injectors were tested at, it made my scale lower, shouldn't it make it higher?
    2000 Corvette Twin Turbo
    2004 CTS-V TVS 1900
    2006 TBSS TVS 1900

    All Tuned by
    Rad Tunes by Troy
    aka Vetteboy2k

  4. #4
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    you dont scale them, you calculate them. go to pcm section on ls1tech and in the stickies there's a spreadsheet that will give it to you right. i've done over a dozen of cars with it, and it works perfect.

  5. #5
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    RedHardSupra,

    That is how I came up with my original figures in the first table. I used the excel table that was modified by you. Attached are some pictures that I found of the injectors and a sheet that came with them. I have a Corvette C5 2000.







    2000 Corvette Twin Turbo
    2004 CTS-V TVS 1900
    2006 TBSS TVS 1900

    All Tuned by
    Rad Tunes by Troy
    aka Vetteboy2k

  6. #6
    Lifetime Member SSpdDmon's Avatar
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    Well, you just posted the problem. Those injectors are flowed at 43.5psi and I believe LS1's run 58psi (4bar). See http://www.ls1tech.com/forums/showthread.php?t=326601 for more info.

  7. #7
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    vetteboy2k - Email me your tune w/ a complete list of mods and I'll setup tables over the weekend for you. It's not just one injector table that you need to modify.

  8. #8
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    Email Sent. Thanks.
    2000 Corvette Twin Turbo
    2004 CTS-V TVS 1900
    2006 TBSS TVS 1900

    All Tuned by
    Rad Tunes by Troy
    aka Vetteboy2k

  9. #9
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    Doing some more research, I found the part number of my injector.

    Part # 01D030B

    It's a Lucas based fuel Injector flowing 440cc@3Bar. Using a Calculator for cc->lbs
    440cc=41.904761904761905lb's

    Then calculating flow rate @43.5psi -> 58psi
    41.904761904761905=48.387451132082916

    So basically I have 48lb injectors.

    What doen't make sense to me is that the figures I entered into {B4001} were for 42lbs, and it was showing an extremely lean condition at Idle (pegged at +25 LTFT's). I can recalculate my injector numbers, but what other table do I need to change so that everything is scaled accordingly?
    2000 Corvette Twin Turbo
    2004 CTS-V TVS 1900
    2006 TBSS TVS 1900

    All Tuned by
    Rad Tunes by Troy
    aka Vetteboy2k

  10. #10
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    Recal {B4001} my table looks like the following

    LABELS Injector Flow Rate (Grams/Second)
    Manifold Vacuum kPa Value
    0 6.096126
    5 6.134119
    10 6.171878
    15 6.209407
    20 6.246711
    25 6.283794
    30 6.320659
    35 6.357310
    40 6.393751
    45 6.429986
    50 6.466017
    55 6.501849
    60 6.537484
    65 6.572927
    70 6.608179
    75 6.643244
    80 6.678125

    I will post back later today what my ltft's look like at idle this time around.
    2000 Corvette Twin Turbo
    2004 CTS-V TVS 1900
    2006 TBSS TVS 1900

    All Tuned by
    Rad Tunes by Troy
    aka Vetteboy2k

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