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Decapping injectors, what are the pros and cons

Discussion in 'EFI Tuning Questions and Engine Management' started by actmobmar, Mar 28, 2019.

  1. actmobmar

    Joined:
    Oct 9, 2010
    I have a fitech 1200 pa, and I'm going to need to upgrade the injectors for my power output. So what is the deal with decapping? Is it a worthwhile mod?
     
    actmobmar, Mar 28, 2019
    #1

  2. Mnlx

    Joined:
    Sep 20, 2009
    Not all can be decapped, and the main issue I see is that you may need numerous injectors to find a set that have matched flow rates. Some are very close, and i've heard others say they needed 2-3 sets to find 8 that were workable as a set.
     
    Mnlx, Mar 28, 2019
    #2

  3. fastspec2

    Joined:
    Dec 24, 2009
    I have a really nice injector flow bench and i have found that static open, decapped injectors have a pretty high likelihood of having a wider range of flow rates. Up to around 95% DC a very large portion of the injectors (LS gm injectors) I have tested are really pretty close.
     
    fastspec2, Mar 28, 2019
    #3
    actmobmar likes this.

  4. Mnlx

    Joined:
    Sep 20, 2009
    Good to hear, i'm just going on what I saw on a few boards, and from Sloppy Mechanics, and Eric Derr. I have access to a flow bench as well, and plan to decap, and test a bunch of ls injectors here in the next couple weeks.
     
    Mnlx, Mar 28, 2019
    #4

  5. actmobmar

    Joined:
    Oct 9, 2010
    I just talked to fuel injector clinic (our local shop), they apparently have a tool/machine to decap them and flow them, but needs to see them first. I don't think it would hurt it if the flows rates differ, as they are injecting behind a ring in each bore of the throttle body
     
    actmobmar, Mar 28, 2019
    #5

  6. Mnlx

    Joined:
    Sep 20, 2009
    That's a good point, one would think a tbi should be less of an issue.
     
    Mnlx, Mar 28, 2019
    #6

  7. actmobmar

    Joined:
    Oct 9, 2010
    I know there is something I have to change in the computer settings, I suppose I could average all the flow rates and input the number
     
    actmobmar, Mar 28, 2019
    #7

  8. westcoastwrenchin

    Joined:
    Oct 4, 2018
    I looked into decaps and theres a guy on ebay who sells some which have been flow matched. Honestly though you can get s good set of deka 80s for $250 used which is the route I went. Why chance it for a hundred bucks on such an important item?
     
    westcoastwrenchin, Apr 2, 2019
    #8

  9. Mnlx

    Joined:
    Sep 20, 2009
    They're much more cost effective if you have the used injectors laying around because you bought complete engines. The cost is pretty minimal at that point.

    With all the Deka copies (and others) out there be careful and do your research. I've run across a couple used sets on marketplace that i'm convinced were copies, and they were asking genuine prices..
     
    Mnlx, Apr 2, 2019
    #9

  10. 65ShelbyClone

    Joined:
    Mar 25, 2004
    65ShelbyClone, Apr 28, 2019
    #10
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