Cat timing advance

Discussion in 'Trucks [ Eighteen Wheelers ]' started by GP1500SC, May 28, 2013.

  1. Far_Call

    Far_Call Medium Load Member

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    The ECM decides what part of the lobe to use as the Cam Injection lobe is driving a PUMP not an injector. Grinding the Cam lobe will have no real affect on timing at all.
     
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  3. Far_Call

    Far_Call Medium Load Member

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    Yes directly related to Boost in this instance.
    Wrong quote sorry see below.
     
    Last edited: May 29, 2013
  4. Far_Call

    Far_Call Medium Load Member

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    Yes,
    Directly related to Boost in this instance.
     
  5. reincarnation

    reincarnation Bobtail Member

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    May 23, 2013
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    some strange jumps in a couple of areas, other than that looks normal. What emission engine it is from? I've heard a rule of thumb that you should have about 1 degree/100rpm, if those are degrees then it is about 10 degrees retarded from optimal at 100% load
    .
     
  6. GP1500SC

    GP1500SC Light Load Member

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    I finally got by a computer as I can't post with my phone.
    I am still waiting on my cam profile, but will spill more of what I am try to accomplish because the lack of being able to change the base fuel table when you put a c16 file, bigger injectors, and a cam in you get smoking issue.
    also the power gets to aggressive to run the cruise.
    The injector lobe never changes in relation to the piston so as the ecm advances the timing it gets closer to the base of the lobe, why not cut the stock injector plunge rate on the top half of the 1000 shaft say starting at 15 degrees so at 25 degrees or whatever the full advance is at 100% load you get the full 1000 shaft affects, and still have the stock cam idle and at light loads?
    and yes it should be done in the ecm not on the cam!
     
  7. allan5oh

    allan5oh Road Train Member

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    Winnipeg, mb
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    Somewhat related question:

    On older engines, did "nox tunes" mostly ###### timing? If so, how much?
     
  8. ecmguru

    ecmguru Bobtail Member

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    Jun 1, 2013
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    you need to change the injector calibration map and smoke limiter map to get smokeless and well behaving engine, that is hat good tuners always dose.All electronic engines are low nox, at least 5 degrees retarded.
     
  9. allan5oh

    allan5oh Road Train Member

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    I'm talking about the late 90's early 2000's tunes that engine shops were required to put in trucks on the road after the EPA lawsuit. These tunes are known as "low nox tunes" and kill power and mpg.
     
  10. dieselroarmt875b

    dieselroarmt875b Medium Load Member

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    the injection timing is changed by controling the spill valve in the unit-injectors,when its closed the injection starts.The only way to change the timing as you wish is to reprogram the ecm
     
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