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high vs. low impedance injectors

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  • high vs. low impedance injectors

    When going standalone is there any benifit on going one way over the other on a Z. I have done some research and found that both have some benifits, but over all is one actually better then the other? Any opinions or experience? Or is it just personal preferance?
    Injectors would be 550cc.
    So far here is what I have read.
    low impedance injectors have a shorter triggering time.
    low impedance injectors will often give a better idle quality.

    high impedance injectors produce less heat within the ECU.
    no external resistors.
    http://www.thegraphicshack.net

  • #2
    High impedence are more common therefor more universal incase you decide to use them in a different application later.

    think of it like subwoofers. if you wire subs in a parallel you drop the impedence which makes the amp push more power. this is the same thing that ecu's are doing. if you have a low impedence injector the injector driver is pushing more power and it may not be designed to do this causing it to heat up and eventually burn out.
    Some amplifiers are not designed to run in a low impedence situation. same with some ecu's(or standalones)

    If the standalone you are running can do both then knock yourself out with either.

    as far as the idle quality running 550cc injectors shouldnt be a problem with either low or high impedence. Its when you get to rediculous sized injectors like 800+ cc's that you gotta take idle into consideration. Because then the minimum turn on time the injector can do may still flow too much fuel at idle.
    85 Z31 6.0 LSX turbo 766whp/792wtq
    04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.

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    • #3
      SATAN wrote: as far as the idle quality running 550cc injectors shouldnt be a problem with either low or high impedence. Its when you get to rediculous sized injectors like 800+ cc's that you gotta take idle into consideration. Because then the minimum turn on time the injector can do may still flow too much fuel at idle.
      that's why formula one cars idle at like 3-5k rpm.
      Funny stories!

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      • #4
        Low-imp or injectors for peak and hold type drivers also supposedly tend to give much more precise control of pulsed fuel flow at higher ratings (over ~52lb/hr or ~550cc) yielding better precision at low pulsewidth (idle).

        High-imp injectors are also usually less expensive.

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