Are these injectors ok??

Discussion in 'Technical' started by JEDI-77, Sep 6, 2011.

  1. JEDI-77

    JEDI-77 Jedi Master

    Planning for a plenum pull in the future, and while I'm there, I want to replace the 18 year old stock TT injectors. I was thinking of getting this kit below:

    Z1 Motorsports Injectors

    They are essentially TT 370cc injectors, of the newer design, with adapter collars to fit into the fuel rail. Can anyone see a glaringly obvious problem with these that I'm just not seeing?

    Cheers
     
  2. TWIN TERROR

    TWIN TERROR Well-Known Member

    They look fine , buuut why not go a bit bigger seeing how you are going to spend coin on new ones could be worth upping the size.
     
  3. beaver

    beaver southern zeds

    The kit is

    fine, only problem could be, you may have to file the plenum, do the injectors sit higher in the rail with the adapters collars. Your better off getting an a/m rail to suite the newer style injectors imo, or an a/m rail kit with injectors.
     
  4. JEDI-77

    JEDI-77 Jedi Master

    I had thought about that....

    but getting larger injectors then requires a dyno tune etc etc.

    I can change the K value in the ECU ROM quite easily to accommodate the larger injectors as I have a Romulator installed, but I assume the ECU would still need a proper tune to run nicely (I can change the K value easily as I have a Romulator installed).


     
  5. JEDI-77

    JEDI-77 Jedi Master

    Well....

    just by going by the info on their site, I assume that the injectors would fit no problems as the kit is designed to be a direct replacement and fit for the older style fuel rail. There does not seem to be any mention of needing to file the plenum.

    Also, I had thought about getting the newer fuel rail for these injectors, but apparently that also requires the newer style lower plenum or machining of the older style lower plenum for these to fit. Thats more work than I intended to do.

     
  6. AndyMac

    AndyMac Better than you

    Filing shouldn't be neccesary...SARDS fit with their massive collars, so these should be A-OK
     
  7. brisz

    brisz Well-Known Member

    Why don't you get you stock ones cleaned and flow tested for a fraction of the price ?

    What benefit will you get from paying 4 times as much ?
     
  8. beaver

    beaver southern zeds

    You

    can buy a/m rails to suite new style injectors that fit straight into an s1 lower plenum, only mod you have to do is change the injector connectors to the new style connectors. nothing else to do as far as fitting goes.



    Also, I had thought about getting the newer fuel rail for these injectors, but apparently that also requires the newer style lower plenum or machining of the older style lower plenum for these to fit. Thats more work than I intended to do.[/QUOTE]
     
  9. JEDI-77

    JEDI-77 Jedi Master

    That is true...

    however, getting the original injectors out and flow tested will cause at least a weeks down time, and finding two consecutive weekends in a row to work on the zed is difficult these days with family/kids duties etc etc.

    And having done a plenum pull and injector clean on my old NA, i've lost the passion to do it on the TT. So this is work that will be done by my trusty mechanic, and I want to have the injectors their and ready to go so he can just put them in with minimal fuss and downtime.



     
  10. JEDI-77

    JEDI-77 Jedi Master

    Do you know??

    where I can get these A/M fuel rails?? Either way, the result is still the same. Either use the stock fuel rail, with the new injectors, new connectors and adapter collars. Or use an A/M fuel rail with new injectors and new connectors.

    [/QUOTE]
     
  11. brisz

    brisz Well-Known Member

    I see what your saying, he should have a mobile guy that can ultrasonically clean and flow test and provide new o-rings.
     
  12. beaver

    beaver southern zeds

  13. Brock32

    Brock32 Active Member

    I have fitted series 2 injectors with this kit.

    There is no plenum grinding required. Really simple job.
     
  14. zed4life (zedcare.com)

    zed4life (zedcare.com) Ω vicarious zedder Ω

    Because many ~20+ year old injectors

    are nearing their shelf life, like many other electrical zed items. Been seeing more and more needing to be replaced lately during plenum pulls. If one is borderline, then the others won't be far off replacement. Cost of getting the plenum pull done by a mech means it is false economy not to replace them all now-especially for a daily driver.

     
  15. brisz

    brisz Well-Known Member

    I think that's a reasonable position for a $20 gasket but not for $800 worth of injectors.

    Mobile Injector specialist will charge about $150.

    If they OHM in range, have good spray pattern, flow equally and don't leak, far as I am concerned they are good to go.

    I don't see any false economy there that's for sure.

    Coils that fail in batches are usually exposed to high voltage or movement, even then its not really the coils themselves that fail. Fuel injector coils are exposed to neither.

    The closest thing I can find for MTBF figures on fuel injectors is 1 billion cycles (Bosch & Delphi), our cars are sequential so the injector fires once per cylinder per 4 revolutions.

    IE
    3000 RPM = 750 actuation's per minute = 45,000 per hour
    1 Billion = 22,222 hours @ 3000 RPM

    2 hours driving per day = 730 hours per year

    That's over 30 years, some 600,000 k's city driving or 2.2 million k's at highway speeds.

    I hope my maths adds up. :eek:

    Yes I realise MTBF doesn't mean they all will last that long, and this is in a perfect environment where fuel quality and a whole range of other factors come into play.

    The point is they last a very long time and servicing is a viable option.
     
    Last edited: Sep 7, 2011

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