Fuel Injectors | Page 2 | Ford Escort Owners Association (FEOA)
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Fuel Injectors

Discussion in 'Engine Tuning' started by novanutcase, Sep 2, 2019.

  1. marclar

    marclar Administrator Staff Member

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    the factory fuel system even with 16# injectors is good for any bolt on-s. even in a turbo setup you can run 4psi or so depending on the turbo CFM capabilities with a draw-thru setup using stock injectors and maf.
    if you indeed are running or are going to run the 19# skinny 4 port injectors, you can just get a maf and connector from a 97/98 split port car and wire it in. some of the wires are backwards though. cant remember off hand which is wich but i think there is a writeup, or i can look on mine at home.
  2. 1993tracer

    1993tracer FEOA Member

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    What is OBD2 ST/LT? novanutcase is running a (2000?) Zetec motor that has OBD2. I have a similiar interest in this because I am running a 98 Zetec in my 98 Wagon and may eventually be looking at a throttle body upgrade. I already plan to change my injectors from the current single pintle to 4 hole of the later zetecs or I have a source that recommends a set from a Volvo app. that should work well.
  3. krux303

    krux303 FEOA Member

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    What about for a zx2? If you can shed some knowledge, can I pm you?

    Sent from my LG-H872 using Tapatalk
  4. marclar

    marclar Administrator Staff Member

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    obd2 has a better fueling algorithm than obd, also has ST short term, and LT long term fuel trims that are more expansive than obd.. obd is dumb, very dumb, but it works. obd2 is far superior, but still has limitations. it will pull the LT fuel trims as far back as it can while it 'sees' extreme rich conditions. either way, just throwing larger injectors in without the matching maf, or 'tune' wont make a bit of difference in performance.

    what do you want to know?
  5. krux303

    krux303 FEOA Member

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    I'm running an upgrade turbo intake cam, cam gears, upd, sct custom chip for advance timing, 4-1 header, full exhaust with no cat, bored throttle body and intake. i created a ported intake manifold, will I have enough fuel?

    Sent from my LG-H872 using Tapatalk
  6. madmatt2024

    madmatt2024 FEOA Member

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    Yes, you should. You are also probably hurting performance running a turbo cam on an N/A motor.
  7. novanutcase

    novanutcase FEOA Member

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    Not really a need. I installed a set of JY injectors I pulled from a car as a temporary measure but they seem to be holding up just fine. I was just anticipating them probably going bad sometime in the near future and I wanted to gather whatever information I would need to so I can swap them out quickly if in fact the 19lb injectors did offer an improvement. Now that Marclar schooled me on what will happen, if one or all the injectors go bad I know to replace them with the same Bosch style 4 port injector.

    How would this improve performance/mileage on a N/A car if the ECU is going to set the trim parameters negating any sort of gains or are you referring to a modified or turboed engine?

    John
  8. madmatt2024

    madmatt2024 FEOA Member

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    The 4 port injectors atomize fuel better than the single port injectors found on the 2nd gens, resulting in a more efficient burn. As I understand it, when the burn is more efficient/complete, you need less fuel to achieve the AFR that the ECU is looking for so your gas mileage can actually increase.
  9. novanutcase

    novanutcase FEOA Member

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    When I replaced the injectors I used the 4 port Bosch style ones so I guess I'm good as far as injectors go unless I decide to turbo the car down the line. Now that I have a definitive answer on this if the injectors decide to take a dump I can act quickly in locating what's needed without having any questions.

    Curious. You had mentioned in another thread that some of the TEAMZX2 forum guys had claimed better gas mileage and performance. That's what got me thinking about upgrading when the time comes. Not sure how trustworthy the info was but how, in your opinion, would this be possible? I ask because I know you aren't one to just throw out bogus info so if you posted it then I assume you found the info credible?

    John
  10. krux303

    krux303 FEOA Member

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    Its an old model turbo crane cam stage 2 which is more of a high torque cam for specs. Car moves very well being somewhere in 14s N/A and 13s on nitrous.

    Sent from my LG-H872 using Tapatalk
  11. marclar

    marclar Administrator Staff Member

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    its all about the atomization, liquid fuel does not burn as well. if you look at more modern injectors the emission is more of a mist than a squirt. the fuel particles need to be as small and evaporated as possible. due to the combustion time, liquid fuel will not burn completely during the burn time, this is what the CAT was designed for, is to have an area where the left over fuel can burn before going out the exhaust. if you ever been behind an old carbeurated vehicle and your eyes start to burn, its because of the wasted fuel.. same theory behind "rolling coal" is basically dumping extra fuel into the system to create smoke.

    so the original 1g injectors had 1 single hole that created a conical spray, ideally ... the transformation into 2g with the 4 nozzles gave it more finer sprays and thus better burn and better efficiency. gas is only about 20% efficient in its most ideal state, the other 80% goes into making heat. so by doing every possible thing to increase that thermal efficiency lessens the cost on the wallet.
  12. novanutcase

    novanutcase FEOA Member

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    Thanks! I'm aware of the advantages of fuel atomization. I was just curious if there was something beyond atomization that improved mileage/performance that I wasn't aware of.

    Thanks again for your information dissemination. It filled a few knowledge holes I had in respects to fuel injection.

    John

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