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Fuel Injectors - So many options, Need help!!

Discussion in 'Forced Induction' started by rfrumusa01, Jan 7, 2008.

  1. rfrumusa01

    rfrumusa01 Bean Cakes

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    My 97 Civic Turbo is probably in the 300hp range @16psi (fully built), with OBD 1 Conversion. Right now, I am using DSM 450cc injectors on the stock rail and FPR, but a walbro 255lph pump, wired with the 10ohm resistors.

    Is this setup correct? or can I unlock more power with larger injectors/higher fuel pressure? I was looking at injectors, if I were to upgrade, what size and saturated or peak and hold? There are so many out there, I am totally confused. Hondata claims my size injector is not good at all considering the power range.

    TIA..
     
  2. purpleh22

    purpleh22 New Member

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    The Hondata folks probably meant that it sounds like you may be operating at the upper limits of your injectors. If you are going to change injectors anyway, go with a 750 to 1000 setup. They cost about the same and give you lots of capacity for future boost increases if you decide to turn up the pressure. Tuned properly, they idle and run as well as the smaller capacity injectors. As usual, make sure your timing and afr is dialed in, if you want it to last.
     
  3. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Go with the size you need, not some large arbitrary number. If you have lots of unused capacity on your injectors, you lose a lot of resolution when you tune.
     
  4. purpleh22

    purpleh22 New Member

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    Sorry to hear that you have resolution problems. It hasn't been an issue for me. Don't know what is different about what we are doing?
     
  5. Briansol

    Briansol Admins Admin VIP

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    ehh, maybe for muscle cars that may be accurate....

    How to size fuel injectors.
     
  6. rfrumusa01

    rfrumusa01 Bean Cakes

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    Well that helps... not sure what BSFC or margin is, but using the numbers you gave me and my estimated 300hp, looks like after converting lb/hr to cc, I need roughly a 660cc injector.

    As for the fuel pressure, whould I need to alter the fuel pressure at all? When I install the new injectors, would it be beneficial to change my FPR and re-tune the ECU? I'm a little sketchy on messing with the fuel pressure. Mainly, I would like to know if new injectors requires a re-tune. I know I will need to re-tune if I change the fuel pressure.
     
  7. xlx_mr_honda_civic_hb_xlx

    xlx_mr_honda_civic_hb_xlx Junior Member

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    im at 233whp and using 450cc's im doin my upgrade within a month and ill b around 350-380 and im using 750cc's u should b good with the 660 u said u need. are u tuing ur car or taking it to a shop to have it done? i would say after any upgrade it needs to be retuned. depending on what turbo u have im surprised that u dont have more whp with being fully built. but if ur guessing then u dont know for sure. how come u havent had it dyno?
     
  8. rfrumusa01

    rfrumusa01 Bean Cakes

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    I'm just guessing with lower numbers so I'm not dissapointed when I get it dyno tuned this spring... but the car has already been street tuned using crome, seems it was done very well. I do see most people with my setup with 750's, i will stick with around 660cc and go from there. Do I need saturated or peak and hold??
     
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