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Thread: 99 6.0 21# injectors to 36#

  1. #1
    Tuner in Training
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    99 6.0 21# injectors to 36#

    hey guys!

    I'm defiantly still in the learning stage for tuning.. I've had multiple people help me along the way, this last tune file I've come up with from a very helpful guy in Michigan I've gone from 21# injectors to 12613411 stock used injectors, which I'm hoping are still good... we have recently tried to set it up for the more fuel in the engine to try and get a bit more power and smoothness out of the engine.. but it seems somehow we went backwards with the tune file? i have a few scans and files saved, is anyone able to point me in a direction to start adjusting? i think maybe more fuel? defiantly trying to keep it as low rpm and as smooth as possible for offroad.. is there a way to test for a failing injector?

    ls yj justin final 36lb injector.hptbigger toodle w no wire adapt feb 10th.hpl

    89 yj with a 99 LS 6.0 , 799 heads, BTR TN cam, headers, CA intake, 4l80e 1600 stall.60 psi rail pressure return less line, self regulating. high flow filter with performance pump. used only as a snow wheeler on long offroad trips fuel milage is important lol..
    89? YJ with a 2000 6.0LS - 4L80E
    Truck Norris cam- 799 heads
    Hd2 shift kit
    Tons w/5.38s
    49? mickey tompson proxs

  2. #2

  3. #3
    Tuner in Training
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    oh boy my parameters are no where near whats in that spreadsheet lol... i also dont see my injector number in there... i assume my 36# injector is like the 12594512 36# ?
    89? YJ with a 2000 6.0LS - 4L80E
    Truck Norris cam- 799 heads
    Hd2 shift kit
    Tons w/5.38s
    49? mickey tompson proxs

  4. #4
    Senior Tuner
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    blindsquirrel knows the injectors as well as anyone but https://www.psiconversion.com/tech/l..._injector.html shows them as cross referencing on the LC9 engines.

    12594512 for 2007-09
    12613411 for 2010-11

  5. #5
    Tuner in Training
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    ok sounds great, i now see ya they cross reference, thank you so i have inputted all this info into my parameters, i know this is a noob question but does having a cam and whatnot change these numbers? or does not affect the injector info?
    89? YJ with a 2000 6.0LS - 4L80E
    Truck Norris cam- 799 heads
    Hd2 shift kit
    Tons w/5.38s
    49? mickey tompson proxs

  6. #6
    Tuning Addict blindsquirrel's Avatar
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    12613411 is for sure in my sheet. Tabs at the bottom.

    screenshot.20-02-2024 17.57.09.png

  7. #7
    Tuner in Training
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    oh yup! im just blind, thank you blindsquirrel
    89? YJ with a 2000 6.0LS - 4L80E
    Truck Norris cam- 799 heads
    Hd2 shift kit
    Tons w/5.38s
    49? mickey tompson proxs

  8. #8
    Tuner in Training
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    i also noticed these parameters are quite a bit diffrent than the ones my tuner sent, should i be worried? haha
    89? YJ with a 2000 6.0LS - 4L80E
    Truck Norris cam- 799 heads
    Hd2 shift kit
    Tons w/5.38s
    49? mickey tompson proxs

  9. #9
    Tuning Addict blindsquirrel's Avatar
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    My method is shown here: https://forum.hptuners.com/showthrea...l=1#post700901

    Maybe your tuner could use some help if he's come up with different numbers.