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Thread: lmm tuning timing fuel HELP

  1. #1
    Junior Member
    Join Date
    Nov 2018

    Default lmm tuning timing fuel HELP

    anything anyone can share to help with timing on duramax, I know ppl say its secrets but I just wanna know limits and guidelines and a kinda where to start and what all to change with timing, fuel, pilot fuel, what goes hand in hand,, what things do u need to change together, any info at all will help just don't wanna tear nothing up

  2. #2
    New Member
    Join Date
    Oct 2013


    7-9* in the cruise range (1400-2200rpms & 20-60mm3) seems to work good. Timing doesnt seem to be a smoking gun for MPG. Even the stock tune calls for 9* in areas, and going higher doesnt seem to help mpg.

    Use the timing calculator, but note to pay attention that the mm3 rows in the duration table does not match up to the table in the tune tool. Dont just copy/paste your duration table into the calculator. 45-50% timing works good. Dont go much over 1800us pulse with a stock trans. Look at pedal torque, see what WOT nets for a value, then drop down to torque based fuel to see what mm3 you will be at. You can then look at fuel pressure, see what pressure you'll be at AND THEN you can go to the pulse table and see exactly what pulse you'll be at (if limiters are not active).

  3. #3
    Junior Member
    Join Date
    Mar 2007


    Oder Starlite diesels tuning book. Zack knowes his 54it nuff said
    1972 Chevy Blazer, Twin Turbo Duramax 6.6
    69 Maro TT 427 LSX, Wayne due Vett frnt sub,
    Lateral Dynamics 3 link rear, D 60,
    T56, 18X10' 18X12 Boze Forged Speedsters,
    13" wilwood 6 pot fronts 13" wilwood 4 pot rears,
    (all Still under construction)

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