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Should I use 42 injectors

This is a discussion on Should I use 42 injectors within the Internal Engine forums, part of the LSx Technical Help Section category; at what point would you consider bigger injectors? I realize if you have a procharger or running turbos there is ...

  1. #1
    Member supaxero's Avatar
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    metallic pewter
    2000 Trans Am WS6

    Should I use 42 injectors

    at what point would you consider bigger injectors? I realize if you have a procharger or running turbos there is a need for more fuel. Is there a need with naturally aspirated motors?

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

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    SOM
    1998 T.A.

    If you have access to hp tuners or EFI live see what your injector duty cycle is. 80% is considered maxed out but some get by fine with more myself included.... I have seen 420hp motors max out a set of 28lb'ers and I have seen the same injector make 445 and be ok. I make almost 420 and and some 36lb'ers would be perfect with my setup or 42's woud also work well and I would have a little room to grow.... for that 383.....

  4. #4
    Member supaxero's Avatar
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    metallic pewter
    2000 Trans Am WS6

    Sorry, I don't have any dyno numbers. 2000 WS6 K&N filter, 85 throttle body with Typhoon intake, mild cam, headers with a flowmaster

    Thanks for the feedback. I guess the stocks will work for now.

  5. #5
    You want MuShu? Soul TKR's Avatar
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    Arctic White
    1999 WS.6 Trans Am

    I had my stockers (24# i think) till about a week ago... my tuner got me into a set of FAST 36#'s... he said that they'd be fine to around 515-520 rwhp... I don't think I'll be anywhere near that so...

    right now i'm at around 446 rwhp

  6. #6
    Member BDowning's Avatar
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    Blue
    2002 WS-6

    I have all the bolt ons and mild cam, with the stock injectors they are running @ 100% @WOT on the dyno. I need to step up to something bigger. I'm at 377 at the wheels now

    Bill

  7. #7
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    red
    TVR Cerbera

    I max'd the stock LS2 injectors at 440rwhp, I now have 42's and am max'd at 513/510 at 58 psi. HTH.

  8. #8
    JUISSED Midnight02's Avatar
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    2002 Camaro SS

    My tuner (a VERY reputable shop here in GA) indicated that the 2000 - 2002 injectors are typically good up to around 460 rwhp. Based on your mods, I would imagine you're good to go....might be a different story if you had a 1998 model.

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