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Thread: Injector duty cycle info please

  1. #1
    Join Date
    Jul 2008
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    The Garage
    Posts
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    Question Injector duty cycle info please

    Just wanted to know what kind of injector duty cycles the boosted guys are seeing with a given engine at a given amount of boost. For Example, here is my info

    4.8L
    11psi
    43#ers @ 84%

    I need all the info I can get, thanks in advance guys

    ~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~

  2. #2
    Join Date
    May 2007
    Location
    Phx ,AZ
    Posts
    218
    Quote Originally Posted by jetmech View Post
    Just wanted to know what kind of injector duty cycles the boosted guys are seeing with a given engine at a given amount of boost. For Example, here is my info

    4.8L
    11psi
    43#ers @ 84%

    I need all the info I can get, thanks in advance guys
    5.3
    10psi
    60# 82% (with no Meth)
    @ 6100rpms
    mpt70
    Truck 2002 Chevy with
    old setup KB turbo kit MP70 LS1
    New setup stock for now

  3. #3
    Join Date
    Mar 2006
    Location
    Mesquite
    Posts
    8,176
    I was:
    6.0l
    12psi
    60# injectors
    Walbro 255lph
    Hotwire Kit

    .....I can't remember what my IDC was

    What pump are you running?

  4. #4
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,038
    Farmtruc has:
    60lb. Badass fuel system consisting of a1000 and -10 feed lines. Rails and external regulator.
    Idc at 92% but fuel pressure is at 65psi
    made 891hp


    Dragalance has:
    stock fuel setup w intank walbro. 48lbers. 8psi turbo
    idc at 100%. Made 525hp
    just about right w a walbro and good fuel pressure


    Good fuel rails and an external regulator will drop idc significantly.

    Excuse the typing iPhone here

  5. #5
    Join Date
    Jul 2008
    Location
    The Garage
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    Quote Originally Posted by farmtruc View Post
    Farmtruc has:
    60lb. Badass fuel system consisting of a1000 and -10 feed lines. Rails and external regulator.
    Idc at 92% but fuel pressure is at 65psi
    made 891hp


    Dragalance has:
    stock fuel setup w intank walbro. 48lbers. 8psi turbo
    idc at 100%. Made 525hp
    just about right w a walbro and good fuel pressure


    Good fuel rails and an external regulator will drop idc significantly.

    Excuse the typing iPhone here
    What size engine does the dragalanche have?

    ~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~

  6. #6
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,038
    Quote Originally Posted by jetmech View Post
    What size engine does the dragalanche have?
    has a 6L w/ a small cam, I think around a 208 duration or something, I honestly cant remember.

    I was running it on 12psi when i first installed the kit, but never really stayed in it, the a/f ratio was ok below 5000rpms or so, anything after that, I had to let off, but felt a lot better at 12psi, night and day difference.

    When it was on 12psi during a dyno session, I saw the real time HP read show 584 around 5000rpms, so I was hoping it would hit 600hp with larger injectors and a better pump/regulator/rails.
    Maybe when I get time I'll pump it up some more, but I know the rearend won't hold up.

  7. #7
    casey23 Guest

    fuel system

    6.6L fuel cell 4303 magnafuel 18psi 83lb motrons 138% Base set from 40,45,50,60... swapped pumps to MUCH bigger race pump only to gain 30hp in the middle... This was my Third fuel system build... and i am SICK... going to a single -8 from the tank with a single 4 barrel and stand alone fuel cell

  8. #8
    Join Date
    May 2007
    Posts
    493
    5.7
    D1sc 23 psi
    Magnafuel 4303 pump at 60 psi base, 80 psi in boost
    60lb. injectors
    Alky Control Meth cranked all the way up, single M15 nozzle

    139% IDC!
    Quote Originally Posted by farmtruc View Post
    It's always a good big accomplishment to get such a big build running. So congratulations on that!
    However, you're already talking bs and the truck is on jack stands, lol.
    Get it on the track, run some respectable times, then say "to all the haterz" because that vid is weak lol.
    You got a long ways to go to compete with the turbos!
    Quote Originally Posted by 2boosted View Post
    Sorry dude....what I meant is that you are full of shit. Your supercharged turd wont ever make it to the 8's and your wasting energies as Casey did.
    Go turbo and be done with it.

  9. #9
    Join Date
    Mar 2010
    Location
    Tuscaloosa, AL
    Posts
    256
    5.3
    tvs1900 8.5psi
    motron 60lb
    intank walbro 255
    65% IDC at 6400rpm

  10. #10
    Join Date
    Feb 2010
    Location
    washington
    Posts
    309
    5.3
    mp42
    walbro in tank
    7psi 98 % idc
    42pound dephi injectors
    new pump and injectors are on there way
    Last edited by ss6speed; 05-17-2010 at 01:33 AM. Reason: forgot injector size

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