Cat timing advance

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

  1. GP1500SC

    GP1500SC Light Load Member

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    Can anyone tell me how far the stock 6NZs timing advances?
    Would it advance comparably to a B model?
    Thanks
     
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  3. Far_Call

    Far_Call Medium Load Member

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    The B model has a Mechanical Advance whereas the 6NZ is an Electronic Engine.
     
  4. j-dawg

    j-dawg Light Load Member

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    Can it be manipulated with cat et?
     
  5. Far_Call

    Far_Call Medium Load Member

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    It is constantly being manipulated at many varying conditions proportional to RPM, Boost, Load, Throttle pos etc etc.
    Remembering the Cam timing is Fixed.. It the ECm that dictates the Injection timing.
    Like below from a C12.
     

    Attached Files:

    GP1500SC and beltrans Thank this.
  6. Far_Call

    Far_Call Medium Load Member

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    ET in its natural State cant change it but it can be influenced to a degree if you can edit the cfg and re-calc the Checksum. however that will be a Global change of the timing sensors only and to me not arguably of any great advantage. However done in the timing Maps its effectiveness is far greater as the degree of timing you may desire at no Load is very different to full load. along with RPM the timing is very different.
     
    beltrans, HISPEED428 and j-dawg Thank this.
  7. reincarnation

    reincarnation Bobtail Member

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    May 23, 2013
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    full load to the right, part load to the left?
     
  8. DannySyn

    DannySyn Bobtail Member

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    Far_Call I'm mapping a tractor and a peterbilt! I can pull, read, and edit the files, just not sure what maps to change. Can you help? looking to increase by only 20% the engines are gonna be fresh rebuilds.
     
  9. j-dawg

    j-dawg Light Load Member

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    You can change about anything you want but without the correct checksum calculator it's useless. This why I asked about doing it with et
     
  10. DannySyn

    DannySyn Bobtail Member

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    CAT ET is not an engineering tool. If you post your byte I'll gladly checksum it for you, thats if your able to help me out. Scratch my back and I'll scratch yours ;) For the pm you sent me on what I use, well I'm a professional tuner so, dynojet (dyno), dimsport, hondata, bdm100, k-tag, kessv2, efilive, etc there is lots out there and I only use genuine sw. I strictly do cars and bikes. Diesel trucks are new to me :/ If my dyno did big trucks I wouldn't be on here, as I would just dyno test my changes till i got what I was looking for. Can you share with me an original file and a dyno proven modified file? also the increase? THANKS :)
     
  11. GP1500SC

    GP1500SC Light Load Member

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    Thanks for the replies everyone!
    Greg how does that C12 map numbers relate to degrees?
    I was contemplateing getting my injector lobe reground on my 1000 shaft and was wondering how far advanced the ecm actually advanced the timeing on a 100% load?
     
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