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Fuel injectors?

This is a discussion on Fuel injectors? within the Forced Induction forums, part of the LSx Technical Help Section category; Im planing for forced induction and decided that 42# injectors are plenty for power that i would like to see. ...

  1. #1
    Senior Member JoshuaGrooms83's Avatar
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    Fuel injectors?

    Im planing for forced induction and decided that 42# injectors are plenty for power that i would like to see. planning on 450ish range with room to see 600 later (in my dreams lol) now im just wondering, what brand of injectors are good?

    guess 60s are a better choice then lol
    Last edited by JoshuaGrooms83; 01-20-2011 at 12:21 PM.

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    I posted this in 35th's F.I. thread a while back. You can plug in your own numbers and double check the recomended injector sizing:

    Flow Rate = (HP x BSFC) / (# of Injectors x Max Cycle)

    BSFC is "Brake Specific Fuel Consumption and on a F.I. application is generally said to be 0.55. For N.A. the standard figure is 0.45. Max duty cycle on injectors should be no more than 80%, or 0.80.

    I think you said 600 hp? So your formula would be:

    Flow Rate = (600 x 0.55) / (8 x .080)

    Flow Rate = 330 / 6.4

    Flow Rate = 51.5625 lb/hr injectors


    Assuming the horsepower level is accurate, it looks like 60 lb/hr injectors would be more than adequate. Hope this helps.

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    Senior Member JoshuaGrooms83's Avatar
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    wow i hate math lol thanks for the formula though. 600 was my pipe dream number but 450-500 is more of a reality for me.
    So if i plug in the numbers as you said

    for 450
    Flow Rate = (450 x 0.55) / (8 x .080)
    low Rate = 247.5 / 6.4
    Flow Rate = 38.67lb/hr injectors

    and for 500
    Flow Rate = (500 x 0.55) / (8 x .080)
    low Rate = 275 / 6.4
    Flow Rate = 42.96lb/hr injectors

    so 42s would be the limit for a 500ish with everything working right and all supporting mods included right? so 60s would still be better than 42s? or would 42s be ok for shooting for 500?

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    TunedbyFrost.com Tuner Frost's Avatar
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    Get the 60s... they are easy to tune and have a ton more overhead room.

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    Senior Member JoshuaGrooms83's Avatar
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    Yeah I figured that would be a safer route judging by the formulas. Plus if i ever do want to go 600hp 60s would be right on the money.

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    TunedbyFrost.com Tuner Frost's Avatar
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    MM made 853 on 60's with higher base pressure. I have many cars in the 750-800rwhp range with them as well. Of course all of these cars have methanol systems.

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    Senior Member JoshuaGrooms83's Avatar
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    sweet! thanks frost. Definatly not ready or really even looking for that kind of power yet. 450-500 is plenty for me, after that ill meth it any brand in particular? Ive heard of Motron? or somthing like that, lucas?, fast, and of course bosch. Not sure what brands good.
    Last edited by JoshuaGrooms83; 01-20-2011 at 12:28 PM.

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    Get the Motron!!

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    Senior Member JoshuaGrooms83's Avatar
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    well for now the system im getting is coming with 42# injectors BUT i will install some 60# later. ill keep the boost at 5-6ish and aim for 450ish. they can manage for now.

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    Senior Member JoshuaGrooms83's Avatar
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    back at it again.
    72#er would definatly kep me in the clear right? lol

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    Moderator 35th-ANV-SS's Avatar
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    I have 62lb injectors and made 500rwhp on 8psi running methanol. Tuned by Frost. I went with Siemens Deka Mototron

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    Senior Member JoshuaGrooms83's Avatar
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    sweet, unfortunatly i fell asleep and lost the bid $150 for some 72# injectors was not a bad deal. guy was just had em laying around damn eurpean time lol
    oh well. Now im back to 60lbs lol but that will get me to 500hp no prob.. with good tune of course lol

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