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Fuel injector

Discussion in 'Wrangler TJ (1996-2006)' started by Adam39601, Feb 2, 2018.

  1. Feb 2, 2018 at 11:14 AM
    #1
    Adam39601

    Adam39601 [OP] Well-Known Member

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    Would like to hear some thoughts on fuel injectors. I thinking about going to change out my stock to a 4 hole injector thoughts annnnnd go.........
     
  2. Feb 2, 2018 at 11:25 AM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Unless you are supercharging, or turbo charging, I think the OEM are fine
     
  3. Feb 2, 2018 at 11:58 AM
    #3
    OFFGRID

    OFFGRID Well-Known Member

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    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    I agree with Chris. You need to increase you need for more fuel before you dump more fuel...I'm not very familiar with the different injectors out there but, If the 4 hole injector is rated for the same flow rate as a 1 hole injector I could see where it could create more atomization of the fuel thereby burning better, but I would think if you changed nothing else the benefit would not be much noticed if at all. If you do it come back and let us know what you come up with. Also get real numbers; before and after. Get something like this that Prerunner turned me on to: https://www.amazon.com/dp/B005NLQAHS?ie=UTF8&psc=1 . It links your cars computer to your smart phone and gives you real time information 0-60 times etc. You have to download torquelite app to use it.
     
  4. Feb 2, 2018 at 12:04 PM
    #4
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Supposedly smoother idle and better off the line throttle response.
    Is the cost worth it?
    If you found the appropriate 4 hole injectors in a junk yard and could clean them yourself maybe.
    There are guys going to 12 hole injectors..

    This guy sells both, can't vouch for him or his products.
    https://www.ksuspensionfab.com/store/c1/Featured_Products.html
     
  5. Feb 2, 2018 at 2:31 PM
    #5
    mudbug85603

    mudbug85603 Active Member

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    I agree with the rest of the comments. Stock motor = stock injectors. The Mopar injectors have worked in many of our motors for decades and up to 300 + thousands of miles.

    4 hole injectors won't do much of anything, maybe a smoother idle, that's about it.
    If there is an improvement, it's likely from changing out worn and dirty for rebuilt and clean.
     
    Last edited: Feb 3, 2018
  6. Feb 2, 2018 at 7:14 PM
    #6
    JKBob 25

    JKBob 25 Well-Known Member

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    Interesting read. Leaned me something. Very cool to know. Thanks guys.
     
  7. Feb 18, 2018 at 9:46 AM
    #7
    mudbug85603

    mudbug85603 Active Member

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    @Adam39601

    Because of this thread and out of curiosity I purchased and installed a set of Ford 19#4 hole injectors from the folks at K Suspension in the link posted in this thread. The first set I received from them had one dead injector, with an email explaining the facts they quickly sent out another set, the next set arrived and worked just fine.
    The results I see/feel with these injectors installed is
    1. a smoother idle
    2. quicker throttle response off idle and only idle
    3. absolutely no gain in power

    After doing some research I've found that the stock injectors 53030778 are rated at 23.2 # with a flow rate of 243.8cc when tested with the fuel pressure of 49#
    While the Ford 4 hole 0-280-155-710 which I received from KSuspension are rated at 18.25# with a flow rate of 191.8 when tested with a fuel pressure of 43 #. When the fuel pressure is jumped up to 49 # like our TJ's should run theses same injectors will produce very close to exactly the same pressures and flow rates of the stock injectors.
    Going to run these injectors to see if there is any adverse effects until I can have the stock injectors rebuilt and flow tested.

    IMO I wouldn't waste the money on the Ford 19# 4 hole injectors from any source, although I already did. Just take the stock injectors to a shop that has the ability to do a ultra sonic cleaning, rebuild and flow testing. It will be about the same price as the Ford 19# are selling for and much cheaper than buying a set of Siemens Deka 53030778.

    Hope this helps
     
    Last edited: Feb 23, 2018
    Prerunner1982, JKBob 25 and OFFGRID like this.
  8. Feb 20, 2018 at 10:07 AM
    #8
    mudbug85603

    mudbug85603 Active Member

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    UPDATE: After a highway run in the foothills of the Smoky Mountains, a route that I normally run, I've noticed that the Ford 0-280-155-710 19# 4 hole injectors actually reduce upper throttle range performance. The TJ wouldn't pull hills at the same speed as it would with the stock injectors This leads me to believe that they are causing a lean run condition.
     
  9. Feb 24, 2018 at 8:00 PM
    #9
    SmittyJeeper

    SmittyJeeper Well-Known Member

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    5" lift, 4.11 gears, tru-trac limited-slips, winch, bumbers... you know the rest.
    I figured I would through my 2 cents in for what it’s worth. I have built many Jeep 4.0 motors over the years in my shop from stock to stroker and all in between. I have an 06 tj myself and run ford 22lb 4 hole injectors with that said I’ve noticed it’s smoother and about 2-3 mpg in stock form also seat of the pants power gains at 3/4 plus throttle. I have the advantage of watching fuel trims among other things on a snap-on scan tool while driving. I have no dyno run to back up any such power gains but I put these in all the EV6 style motors I have built with great results. Check out RockAuto some time they have great prices for just about everything.
    A154A898-C387-43F6-A0CA-4F15D44A8D11.jpg
     
    Last edited: Feb 24, 2018
    aggrex and JKBob 25 like this.
  10. Feb 25, 2018 at 9:08 AM
    #10
    2oldjeeps

    2oldjeeps Well-Known Member

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    98 and 2000 xj's 99wj
    98 lifted, 00 stock 99wj just beautiful
    in 16 months and 8000 miles in my 2000 4.0 i have not had to floor it once. more power than i need and runs smooth, as long as i dont mess with whats working great,,,stock.
     
    JKBob 25 likes this.
  11. Feb 25, 2018 at 5:24 PM
    #11
    mudbug85603

    mudbug85603 Active Member

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    A fuel injector gives an increase of 2-3 MPG ????

    If that is true, wonder why the engineers at Chrysler didn't install these to meet and exceed the federal emission requirements also would have been a great selling point for the TJ to get 20+/- mpg, after almost a decade of 15-17MPG
     
    Last edited: Feb 25, 2018
    JKBob 25 likes this.
  12. Feb 25, 2018 at 8:40 PM
    #12
    2oldjeeps

    2oldjeeps Well-Known Member

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    98 lifted, 00 stock 99wj just beautiful
    it seems that no matter what we do with gas and air delivery, the computer will attempt to maintain the designed air fuel ratio. same discussion goes on in hummer forums.
     
    JKBob 25, chris4x4 and mudbug85603 like this.
  13. Jul 17, 2019 at 3:23 PM
    #13
    Jeep Sheep TV

    Jeep Sheep TV New Member

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    31" Tires 1.5" lift
    Hey guys just to tack on, I also installed the K-suspension injectors and have had no issues as of yet.
    I made a video where I try to determine if they improved my engines performance through a some tests.
    my data shows that they improved my jeep by a small amount, trust my data or don't but I hope you enjoy the video:
    https://www.youtube.com/watch?v=4yMUMKJky4g
     
  14. Jul 18, 2019 at 6:03 PM
    #14
    JKBob 25

    JKBob 25 Well-Known Member

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    2" Superlift kit. 315/ 70/17.
    Welcome to the forum @Jeep Sheep TV . Although this thread died bout 17 months ago. Video might respark interest. :jerkoff:
     

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