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Do I need bigger injectors?

This is a discussion on Do I need bigger injectors? within the Internal Engine forums, part of the LSx Technical Help Section category; Here is what I am got on my 03 Z06 currently: Kooks Long Tube Headers w/ high flow cats and ...

  1. #1
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    Exclamation Do I need bigger injectors?

    Here is what I am got on my 03 Z06 currently:

    Kooks Long Tube Headers w/ high flow cats and xpipe
    Vararam
    160 tstat

    Here is what I am getting ready to add:

    Futral Motorsport F13 Cam 230/232 .595/.585 112+4
    Patriot LS6 style 2.02"/1.6"/59cc Heads which will make compression 11:1

    Stock block and everything else.

    Thanks
    Ray
    Last edited by am.mscl; 02-16-2006 at 11:49 AM.

  2. #2
    Grand Imperial Wizard Sarge's Avatar
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    I doubt it.....actually...flat out no...your fine...injector cycles will be fine...

  3. #3
    Bombguy99Z28
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    If you have 28lb injectors, then it depends... my camaro with does around 400rwhp/tq and is at 100% duty cycle @ 6000 rpms w/ 28lb injectors.

  4. #4
    Senior Member ninobrn99's Avatar
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    all bore 370 Trans Am

    i would/ did. i went with the svo 42# injectors. Once you get your IFR's correct, you shouldnt be using that much injector. You will also have a cushion for future mods. If your continuously maxing out your injectors, they are prone to fail or loose some of their integrity.

  5. #5
    So I put it in her butt.
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    I would go ahead and put some 42s in. You know you are going to do more mods. Room to grow. Once you get the injector pulse worked out it is all gravey. That cam is mild enough that you shouldn't have to worry about a tune right now, but it would benefit you to get the most out of what you are running.

  6. #6
    Senior Member mrr23's Avatar
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    they will be fine. i have 26# injectors on both of my cars.

  7. #7
    Bombguy99Z28
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    What fuel pressure? What afr? What duty cycle? Its entirely possible to support over 400rwhp with 26lb injectors, with a leaner target afr (13.0+) and a very high duty cycle.

    I wouldn't make a statement like that to someone who doesn't want to run over 13.0afr and wants to keep duty cycle around 85% (recommended by virtually everyone).

    I highly doubt your cars are making 400+ rwhp with stock fuel rail pressure and 85% or less duty cycle.

    Quote Originally Posted by mrr23
    they will be fine. i have 26# injectors on both of my cars.

  8. #8
    Senior Member mrr23's Avatar
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    Quote Originally Posted by Bombguy99Z28
    What fuel pressure? What afr? What duty cycle? Its entirely possible to support over 400rwhp with 26lb injectors, with a leaner target afr (13.0+) and a very high duty cycle.

    I wouldn't make a statement like that to someone who doesn't want to run over 13.0afr and wants to keep duty cycle around 85% (recommended by virtually everyone).

    I highly doubt your cars are making 400+ rwhp with stock fuel rail pressure and 85% or less duty cycle.
    well, i can't verify the duty cycle, but i can verify i'm over 400 rwhp. both with entirely stock fuel systems.

    00 formula this was before the bassani tru-dual exhaust


    99 formula

  9. #9
    Senior Member mrr23's Avatar
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    so, i guess i can say he will be fine with his stock 28# injectors with the mods he has.

  10. #10
    Grand Imperial Wizard Sarge's Avatar
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    Quote Originally Posted by mrr23
    so, i guess i can say he will be fine with his stock 28# injectors with the mods he has.
    I love being called out dont you
    I put down over 500 RWHP and 600 RWTQ on stock injectors/fuel rails/fuel pump w/ Kenne Bell BaP.... untill a rod bolt let loose....FP was rock solid at 62lbs and AF was in the 11's throughout the rpm range....this with a wet shot @100HP....H/C and other goodies of course...

  11. #11
    Senior Member mrr23's Avatar
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    Quote Originally Posted by Sarge
    I love being called out dont you
    not really. then i come off as the butthead for proving otherwise,

  12. #12
    Grand Imperial Wizard Sarge's Avatar
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    Quote Originally Posted by mrr23
    not really. then i come off as the butthead for proving otherwise,
    If being accurate means being a butthead I'll take being a butthead 24X7.
    This is my signature. It is mine. Nobody else has one like it.

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