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  1. #1
    Gatorcountry's Avatar
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    Fuel Injector Flow Testing

    While I'm waiting on parts, I sent out my fuel injectors for some cleaning and flow bench testing. MPS takes a before and after picture of the injectors on the bench - a great way to see what the injectors are actually doing.

    I am very happy with the work they performed, especially the detailed flow report. I gained at least 2% increase on each injector with the worst one improving almost 3%.

    They also replaced the o-ring and filter in each one. Much cheaper than buying new injectors - plus you get the benefit of seeing how they actually flow. I would like them to be matched better, but I'm thinking of moving the #1 injector to #3 cylinder - should be some extra fuel flow.

    One good thing - these injectors flow. They were tested @ the stock pressure of 45psi, but they easily flowed up to 65psi. The stock injectors should easily handle whatever mods we throw at them..

    We have Ross getting us more air flow, and others are working on better fuel delivery. Should be some interesting things coming up in the near future.
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  2. #2
    Chine Walker
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    Gator:
    What's the cost of the service? You may be better off not having all of the injectors equal, this way, as you said, you can put the higher flow injector on the #3 cylinder. The difference between the low and high flow #s, is 1.49%
    Here's an alternative shop, well known in the auto performance arena.

    http://www.rceng.com

    Regards,
    jp
    Last edited by jpa1300; 11-13-2007 at 07:16 PM.

  3. #3
    Gatorcountry's Avatar
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    The cost was $22.50 per injector. I checked out RC Fuel Injection but ended up going with MPS. Either one is a good choice.

  4. #4
    Chine Walker
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    Gator, any reason for not using RC?
    jp

  5. #5
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by Gatorcountry View Post
    The cost was $22.50 per injector. I checked out RC Fuel Injection but ended up going with MPS. Either one is a good choice.
    My place flow tests, cleans, and replaces the screens for around $20.00 each too. And yes run the best one on #3.

  6. #6
    Gatorcountry's Avatar
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    Quote Originally Posted by jpa1300 View Post
    Gator, any reason for not using RC?
    jp
    Just that MPS is in Florida not far from where I'm at, so I saved some on shipping. They also had one day turnaround.

  7. #7
    Chine Walker
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    Richard/Gator:
    Does it pay to have one injector flow a bit more to use in #3 cyl? Would a 5% increase suffice?
    Regards,
    jp

  8. #8
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by jpa1300 View Post
    Richard/Gator:
    Does it pay to have one injector flow a bit more to use in #3 cyl? Would a 5% increase suffice?
    Regards,
    jp
    #3 is and has always been the problem, cylinder especially on the EFIs. I would definately run the best flow on #3. 5% is huge if you could get that much more fuel in there. I have played around with a collar or insert for the inlet of #3 to restrict the air flow a bit. A little more fuel would be better.
    Last edited by WFO; 11-13-2007 at 07:50 PM.

  9. #9
    WATER WOODY's Avatar
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    Great post Gator!

  10. #10
    Chine Walker
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    Spoke with RC (MPS was closed for the day) and it's a different ball game if you want different rates. Some injectors allow machining the nozzle, but the GPR plastic ones may not. So it's up to the set you have wether you get one with a greater flow (normally you'd want equal flow).

    jp

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