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  • Injector Calculator

    Thought you guys might be able to make use of this. Making EDUCATED guesses is the name of the game...Hope this helps out.

    INJECTOR CALCULATOR

    I calc'd my build out last night.

    I can't recall the % drivetrain loss there is for whp on FWD so I went with 15%

    480bhp(~408whp)
    BSFC = .65 (Turbocharged Motor)
    Duty Cycle = .65
    PSI @ Rail = 55psig (which I think we can do just fine since we sit @ like 40 I think)

    Injector Size = 1122cc (so a 1000 - 1100cc might work for the build if not bigger)

    INPUTS? Anyone?

    Tim

  • #2
    thanks for the link, i'm going to post that fucker in the Tech Articles
    [img width=600 height=150]http://www.sixthsphere.com/storage2/images/wejag665buljx09mu77e.jpg[/img]<br />99SL2 w/97SC2M Engine/Trans Swap, CAI, 2.25 Custom Exhaust

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    • #3
      See I AM good for something =)

      Comment


      • #4
        sooo, 1100cc for me. ian (qwksl2) here i come!!!

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        • #5
          thats half the part. now you need to figure out the rest of the fuel system.

          if it was me, i would increase pressure a bit more and increase the duty cycle to 70-75%
          Ian---The Fat Ass

          1995 SL2-High compression engine FOR SALE
          2010 Chevy Cobalt SS- tuned with plenty of goodness
          2002 SC2-New daily
          2017 Kawasaki Ninja 650 KRT- got a stupid deal
          2003 Ford Taurus SES- free daily beater

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          • #6
            I shot another set of numbers as such:

            480bhp~408whp
            BSFC = .65
            DC = .70
            Pressure = 60 PSIG
            right around 994 or 1000cc injectors

            Also shot this:

            425bhp = 361.2whp
            BSFC = .65
            DC = .70
            Pressure = 80psig
            765cc Injectors

            I'm not sure what a safe pressure is on the ECOtec fuel rail so I didn't go apeshit on the pressure. Oh yeah, also thought back on that comment about considering the rest of the fuel system. I'm going with a Walbro 255L/hour pump and an FPR from Aeromotive as well as some SS braided lines for the fuel movement, most likely going to convert it to a return style as well. So I have thought about the rest of it...just so happens that I posted this before I confided in you about the rest of the fuel system. [img]{SMILIES_PATH}/icon_razz.gif[/img]

            Tim

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            • #7
              cool. but i just looked in my gm performance guide book, and dont see anything about the fuel rail, which im sure can take like 60+psi. but i also noticed their fuel injector suggestions for certain power ranges, and for 400-600 they say to use 4 70lbs (like 735cc) injectors, tuning of course is the key to making certain injectors work.
              Ian---The Fat Ass

              1995 SL2-High compression engine FOR SALE
              2010 Chevy Cobalt SS- tuned with plenty of goodness
              2002 SC2-New daily
              2017 Kawasaki Ninja 650 KRT- got a stupid deal
              2003 Ford Taurus SES- free daily beater

              Comment


              • #8
                Hrmmm.../ponder

                Comment

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