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Thread: What size injectors?

  1. #1

    Default What size injectors?

    What size fuel injectors would I need for a dry EFI Pro Fogger kit like #04470NOS? The instructions say "a general rule of thumb is an extra 30 lbs per 100 HP shot".
    I am using an HP ECU. I have a purpose nitrous built LS3 based engine, which originally used 42 lbs injectors, and I want to shoot at least 300 HP.

    1) Would I need 120 lbs injectors?

    2) If this was an E85 car, would I need to go to a 16 injector set up for a 300 shot?

    3) What is the largest injector I can run on the street without running into "driveability" issues?

    Thank you, Scot

  2. #2
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    Default

    Quote Originally Posted by Scotty View Post
    1) Would I need 120 lbs injectors?
    Need more information.
    How much horsepower is the engine naturally aspirated?
    How much total horsepower (with N2O) will the engine produce?

    2) If this was an E85 car, would I need to go to a 16 injector set up for a 300 shot?
    I seriously doubt it. Provide the horsepower figures from question #1, then read these links:
    http://documents.holley.com/techlibr...l_injector.pdf (Selecting a Fuel Injector)
    http://www.injectordynamics.com/HPCalculator.html (Injector Dynamics BSFC Guidelines)
    https://www.injector.com/injector_selection_guide.html (Marren Fuel Injection Calculator)

    3) What is the largest injector I can run on the street without running into "driveability" issues?
    With sequential injection, you should be able to run the 120 lb/hr fuel injectors on the street (at 43 psi fuel pressure):
    http://forums.holley.com/showthread....amp-Paired-EFI (Sequential EFI vs. Bank-to-Bank & Paired EFI)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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