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Fuel Injectors????

Discussion in 'Engine Building' started by gocivicls, Aug 14, 2003.

  1. gocivicls

    gocivicls Senior Member

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    My setup is an LS motor with all the stuff waiting to be installed!!!
    My cr should be around 11.4 to 11.7 when I finish depending on the head gasket I choose......Any way my question is, do I need more fuel? Bigger injectors that is.
    I got a good deal on an EK 9 Civic Type R fuel rail and Injectors, and I want my
    motor to look bone stock. So I figured they would be perfect! What psi should I run after I raise the compression and change the injectors? I know that my stock LS injectors suck after 35 psi and I start to loose power.

    :worthy: I need some facts or tips! :worthy:
     
  2. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    You really don't need to make any changes to your fuel delivery system if you're just bumping up compression on a non-VTEC B18... your stock injectors ought to hold up just fine. The part about your injectors "sucking" after 35psi might be from too much fuel. Go do yourself a favor and tune it on a dyno with an SAFC, Hondata or something else that you can use to have significantly more precision than an adjustable fuel pressure regulator.
     
  3. gocivicls

    gocivicls Senior Member

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    Thanks for the info, you are the man!!!!

    Why do the top fuel Sport Compact Cars that run in the 8's and 9's all have 8 injectors? I guess my question is what cases is more fuel delivery critical to the performence of the engine? I suppose you will say turbo, nitrous, or Supercharged engines mainly................Feed me some info!!


    Also Why do EK9 Civic Type R's have a higher cc fuel injector than an EK9 Civic Si?
    I would think because of higer revs, more aggresive cams and higher fuel curve from the JDM ecu, Am I right? So if I am correct than with the mods I want to do to my ride I could use the injectors for my bennifit..........Maybe, let me know!
     
  4. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Cars running 8s and 9s in the quarter use more injectors because they need that much more fuel- and tuning 8 separate injectors instead of just 4 really big ones is sometimes easier and more precise.

    You don't need bigger injectors because you're really not getting THAT big of a power increase from just raising compression.

    I'm pretty sure that all B series engines came stock with 240cc injectors. I know the ITR did, so why should the CTR be any different?
     
  5. JDMilan

    JDMilan Senior Member

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    A decent upgrade to CC's in honda injectors are the prelude units if you don't want to spend that much, they are 270cc. Kind of an inbetween from small RC's and B series stockers. YOu don't need larger injectors currently until you can find out if your current injectors are working a full capacity or duty cycle.


    Milan
     
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