Setting series 60 injectors

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 1999blue, Apr 19, 2011.

  1. 1999blue

    1999blue Light Load Member

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    Today I went to a shop and they did a computer scan on my injectors settings. They went from 48 to 86. The programer said they should all be set at 99.
    The question was setting all the injectors at 99 , was it the right option ?
     
  2. Pablo-UA

    Pablo-UA Road Train Member

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    No. There is calibration number on every injector. If you wanna see cal. nambers, remove valve cover and read all calibration number and compare with stored in ECM EPROM. Wrong calibration numbers cause rought idling, bad fuel milage.
     
  3. stranger

    stranger Road Train Member

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    The injectors are set according to the number stamped on the injector. Usua;;y all 6 injectors will each have a different number to be stock. That being said, I have set all to a higher number, but was lucky that the truck still idled even.
     
  4. 1999blue

    1999blue Light Load Member

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    Mr. Hanney, Would you please respond to this posting?
    My engine is running smoother and the response is much quicker after changing the injector setting
    If I understand, setting the injectors to the cal stamp is the correct method, In reality then, You can "NOT" change the fuel flow of the injectors using the ecm ? If that is so ""then why have electronic injectors? Is this a EPA issue?
     
  5. Heavyd

    Heavyd Road Train Member

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    When injectors are made, no two injectors will every be exactly the same. They will never inject the exact same amount of fuel. Some will inject more, and some will inject less than the "average". Basically they manufacture a bunch of injectors and then conduct testing with them to see exactly how much fuel each injector injects. They will cycle them through hundreds of injection cycles and preciesly measure the total amount of fuel it injected and then divide that amount by the number of injection cycles. For the production run, they find injectors that inject the most and the least and then they start a fueling calibration table against how a "perfect" injector would perform. All injectors are tested and then measured to ensure the 6 that are in your engine are injecting the same amount. The injectors are give a calibration code depending how they performed on the fueling table. The ECM gets programmed with the complete fueling table values. They the ECM is programmed with injector calibrations and their location in the engine. What the ECM does is leave the injector solenoid energized a little longer or shorter to compensate that particular injectors to be "matched" to each other. The injector calibration codes tells the ECM how to modify the metering. With Detroits, the bigger the number does not mean you have "better" or "stronger" injectors. Detroit Diesel purposely randomized the numbers to keep the cowboys out of it! There is a number that allows for maximum fuel injector metering, I was always under the impression it was 75. I am sure there may be few "magic" numbers.
     
  6. stranger

    stranger Road Train Member

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    I set a couple of my trucks to .75 with good results in power and economy. Your results may vary.
     
  7. Pablo-UA

    Pablo-UA Road Train Member

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    it is a gamble to change injector calibration