Fuel Injector Servicing

Discussion in 'For Sale by Businesses' started by pennyarvs, Feb 2, 2012.

  1. pennyarvs

    pennyarvs New Member

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    Time to get those injectors tested and cleaned after 20 odd years of fueling up our cars. We all know how vital it is to keep a healthy and ample supply of fuel to our very own engine. Flow testing is beneficial before & after having them cleaned so as to be able to:

    1. establish a baseline
    2. come up with an injector diagnosis
    3. create a strategic plan on how to address issues if there are any
    4. compare the pre- & post- test results
    5. and finally conclude if goals are met or not.


    Old, brittle and defective o-rings as well as the pintle caps need to be changed once and for all to lower the risk of having leaky injectors. A complete service offered here generally includes, but not limited to:

    1. physical inspection
    2. external surface cleaning
    3. ohm resistance checking
    4. leak testing
    5. spray pattern checking
    6. flow volume testing
    7. ultrasonic bath/cleaning
    8. back flushing

    9. repeat of steps 4, 5 & 6
    10. data collection
    11. replacement of o-rings & pintle caps




    I wouldn't go into further details regarding the processes involved. Just send in your injectors to my postal address (will be disclosed through email/PM) as securely packed as possible and we'll go from there. It will be a forum charge of $25/injector, excluding postage back to the owner.

    On the other hand, a $19/injector special forum charge is at stake for the FIRST 10 members who would contact me in the next couple of days. This will still include the whole complete process as above as well as new upper o-rings, new lower o-rings, new pintle caps and a written summary/report of the whole procedure. I'd be putting down a list below so as not to cause any issues with the "first in, best dressed" promo. After which, price will go back as per previously mentioned.


    I can be best contacted through email for further queries. Happy to discuss anything regarding such matter. My email address is:

    pennyarvs@yahoo.com




    I work full time from 9am 'til 5pm so please be patient. Rest assured, I'll get back to you as soon as my schedule permits.



    Happy zedding everyone...


    Arvin :br:






    $19/injector



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  2. pennyarvs

    pennyarvs New Member

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    9 slots to go:


    1. N/A91zx
    2.
    3.
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    5.
    6.
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    10.


    AAA :zlove:
     
  3. pennyarvs

    pennyarvs New Member

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    UPDATE: 7 (?) slots to go...


    1. N/A91zx (2 sets)
    2. ABZ300 (1 set)
    3. zed4life (1 set of S15 injectors) ?
    4.
    5.
    6.
    7.
    8.
    9.
    10.


    AAA :zlove:
     
  4. DVIOUS

    DVIOUS a.k.a TZA

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    Put me down

    Put me down

     
  5. pennyarvs

    pennyarvs New Member

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    SMS sent with my address.
     
  6. pennyarvs

    pennyarvs New Member

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  7. pennyarvs

    pennyarvs New Member

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    UPDATE: zed4life confirmed + gmbrezzo. 5 slots to go...


    1. N/A91zx (2 sets)
    2. ABZ300 (1 set)
    3. zed4life (1 set of s15 injectors)
    4. Dvious (1 set)
    5. gmbrezzo (3 injectors)
    6.
    7.
    8.
    9.
    10.


    AAA :br:
     
  8. pennyarvs

    pennyarvs New Member

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    Almost finished. 4 slots to go...


    1. N/A91zx (2 sets)
    2. ABZ300 (1 set)
    3. zed4life (1 set of s15 injectors)
    4. Dvious (1 set)
    5. gmbrezzo (3 injectors)
    6. Dodgey (1 set)
    7.
    8.
    9.
    10.


    AAA :br:
     
  9. pennyarvs

    pennyarvs New Member

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    Last 3 slots left before we wrap this up...


    1. N/A91zx (2 sets)
    2. ABZ300 (1 set)
    3. zed4life (1 set of s15 injectors)
    4. Dvious (1 set)
    5. gmbrezzo (3 injectors)
    6. Dodgey (1 set)
    7. syntax_X (1 set)
    8.
    9.
    10.




    Anyone else got their engine out or their zeds garaged for the meantime... this could probably be the best time to get those injectors revived. Feel free to send me a PM for any queries. Happy to discuss anything regarding the processes involved for you's to have a better understanding of what this procedure is all about and what benefits it brings to our babies...


    AAA :br:
     
  10. mikemd

    mikemd New Member

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    I presume you mean last three spots at the special reduced price? Service will be still available in the future, I hope...?? Good to see it's going well, Arvin, certainly a well-needed service and one all Zed owners should consider...
     
  11. pennyarvs

    pennyarvs New Member

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    Thanks for the kind words, Mike. Yes, just for the reduced price. Will definitely stay and continue servicing for the forum. Got heaps of pending jobs from outside to be done at the moment so will keep me busy over the rainy weekend...


    AAA
     
  12. Z32 TT

    Z32 TT Active Member

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    Just wanna say that i checked out your thread and you work looks quality well done.
     
  13. pennyarvs

    pennyarvs New Member

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    Thank you, mate...


    AAA :zlove:
     
  14. brisz

    brisz Well-Known Member

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    Nothing to consider, if your doing a plenum pull and the injectors have not seen a clean for a few years, if not 20, even if the car seems to run well, you should have your injectors cleaned and tested for even flow rate and pattern.

    That is if you are interested in perfomance, reliability and fuel economy.

    Particulalrly with some of these cheaper injectors coming to market I would have brand new injectors flow tested and then fit in ascending order of flow to the engine to have the one flowing the most in cylinder 6.

    The flow sheet that the cheaper injectors come with isn't worth squat IMHO.

    If this service was available when my engine was built I would of tested the brand new Nismo 555's and fitted as per above.
     
  15. pennyarvs

    pennyarvs New Member

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    Very interesting. :)

    Mind elaborating why it should be that way, mate?


    AAA
     
  16. brisz

    brisz Well-Known Member

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    Good street injectors (Nismo) will/can vary 2-3%, cheapy Chinese will/can vary 5% plus.

    The rear cylinder (6) is most prone to detonation and the demise of many a VG30DETT an engine, the theory is that it runs the hottest due to being at the end of the cooling circuit.

    More fuel will minimise this situation.

    I also like the idea of fuel equals power produced and the closest matched injectors/cylinders are firing in order, something peculiar to the VG30DE's firing order 1-2-3-4-5-6.

    Akin to balancing the engine, the engine runs in the smoothest fashion possible, promoting overall power production and longevity.

    Just another refinement IMHO.
     
    Last edited: Feb 13, 2012
  17. pennyarvs

    pennyarvs New Member

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    Very informative. Thanks for your opinion. :)

    So, how is this percent variation tehnically measured?

    1. Flow test the six injectors 'til one or more reaches 100ml then compare?
    2. Flow test for 30secs then multiply by two to get the ml/minute and compare?


    AAA
     
  18. brisz

    brisz Well-Known Member

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    The larger amount of fluid the more accurate because of averages and rounding the measurement.

    Those electronic flow testers usually have several routines for lower to higher rates of flow and routines that run across the duty cycle range.

    I would experiment to see if the flow order is maintained at low med and high rates of flow and compare to order of flow from the varied routine.

    But high flow order is probably the most applicable.

    I am not 100% sure but I would think percentage is in relation to the injectors rating and plus or minus.

    So a HUGE potential difference between a 2% quality injector and a 6% shitter.

    A 2% 555cc injector could be between 544cc and 566cc.
    A 6% 555cc injector could be between 522cc and 588cc.

    I would want to reference the flow test against the injector rating to confirm I didn't have 6 bad ones from a batch, IE are the injectors what they are supposed to be, or what injectors are they.

    A 555cc flows 555cc per minute at 43.5 PSI pressure, so at 80% duty cycle theoretically it should flow 444cc, but it will probably flow a little less due to latency.

    So depending on the limitation of measuring cylinders on the machine you will be able to run a time and duty cycle based test to determine the actual flow rate of the injector.

    So once you work out how to rate unknown injectors you will be able to test known injectors and compare the flow rate to what it should be.

    I am sure this and more or better strategies using the machines functions will be in the machines instruction book.
     
  19. pennyarvs

    pennyarvs New Member

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    Thanks heaps for all these pieces of information, mate! These will truly benefit the whole forum for a better and more systematic method of servicing for our members' injectors...


    Arvin :zlove:


    P.S. Where is that "43.5 PSI" value regarding 555cc's flow rate derived from?
     
  20. brisz

    brisz Well-Known Member

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    43.5 PSI equals 3 Bar, its is the "widely accepted" EFI pressure, I do not know why.

    I would say it could get confusing if Porsche rate an injector at a certain models fuel rail pressure and then it is used on a differnt pressure, as long as your aware and keep an eye out for oddities it should'nt be a problem.

    Our FSM rates our fuel pressure regulater at 43.4 PSI have no idea why not 43.5, 3 bar dosnt even round that way when converted.

    Heres a good refrence: http://users.erols.com/srweiss/tableifc.htm
     

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