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General High Z vs Low z

Posted by Mattjaye2198, Jun 17, 2019

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  1. Mattjaye2198

    Mattjaye2198 Proven Member

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    Louisville, Tennessee
    What kind of difference is there between the injectors when tuning? I’ve currently running a Walbro 255 but upgrading to a Walbro 450 or something similar. I’ve read a lot about the efficiency but the price difference is huge. I’m not saying I’m definitely buying Low Z but I’d like to get some feedback from anyone that might know firsthand
     

    Street Build 1K  7

    1998 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. motomattx

    motomattx Proven Member

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    wampum, Pennsylvania
    High impedance injectors generally idle and start better, they dont require a injector resistor box, and they are all around easier to tune with/more linear.
     

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    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  3. Brando_DSM

    Brando_DSM Probationary Member

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    Joined Jul 6, 2017
    Wesley Chapel, Florida
    ^high impedance has become much more favorable with growing injector technology.
     
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  4. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Joined Nov 14, 2013
    Independence, Kansas
    Large low z injectors have a hard time transitioning between low pulse widths and WOT situations. My 1650 low z's gave me that problem and I couldn't tune it out so I put in Hi z 2150's and they were so easy to set up and dial in.
    Agree that the Hi z are much easier to tune, at least for what I do.
     

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    1967 Chevrolet Camaro RS
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    1992 Eagle Talon TSi AWD
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    1990 Eagle Talon TSi AWD
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  5. lasthope05

    lasthope05 Proven Member

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    Philadelphia, Pennsylvania
    Basically low z for injectors under 1100cc and high z for anything above.
     
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  6. Mattjaye2198

    Mattjaye2198 Proven Member

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    Joined Jul 26, 2015
    Louisville, Tennessee
    Awesome I know which way I’m going
     

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    1998 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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