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Thread: 2003 CM845 Final Timing Correction & Master Fuel Correction Reason

  1. #1

    2003 CM845 Final Timing Correction & Master Fuel Correction Reason

    Still new to HP tuners and trying to learn all the ins and outs. I am having a few limiters on this truck and was wondering if anyone new the different Fuel Corrections and different Timing Corrections? This would help me look at my logs and lead me to the correct limiter in my tune file. For example I have Final Timing Correction Reason of "Four D". I have looked in the tune file and shut one thing off at a time, but have not been successful at getting it to go away.

    Is it strange that under Main SOI Timing There is only Transient and Low Air Dens.? I am in the Idaho area and we are at 13.4psi but the truck would only respond to timing I put under Low Air Dens. HP tuners says that is for High Altitude, but we are not high altitude. Any thoughts on that? Thank everyone.

  2. #2
    Advanced Tuner MAIDENCR's Avatar
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    Four D is the main table
    03 cummins,175% flux injectors,dual cp3,s467.7/83 1.00
    Nv5600 with valair triple disc clutch

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    Yep, just means it?s running normal.

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    Quote Originally Posted by Sschulte16! View Post
    Is it strange that under Main SOI Timing There is only Transient and Low Air Dens.?
    What?s strange about it? That?s all that?s in those ECM?s.

  5. #5
    Low air density table is for high altitude timing, but i am at a low altitude. Should it be running me off of transient or the low air density table?

  6. #6
    Advanced Tuner MAIDENCR's Avatar
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    In my tune both table have the same value
    03 cummins,175% flux injectors,dual cp3,s467.7/83 1.00
    Nv5600 with valair triple disc clutch

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    Quote Originally Posted by Sschulte16! View Post
    Low air density table is for high altitude timing, but i am at a low altitude. Should it be running me off of transient or the low air density table?
    Look at it this way, transient and steady state and it'll make more sense. You'll pretty much rarely ever meet the conditions to hit the "transient" table and what HP Tuners labeled as "Low Air Density" is flat out wrong.
    Last edited by Jim P; 08-30-2020 at 11:16 AM.

  8. #8
    That is what I was confused about. I didn't think that was right at all. Thank you. Have you ever seen a manual truck at 100% TPS in 2nd and 3rd gear pop at 2500 rpm? It is much worse in 2nd. Thought maybe rail was to low, but I raised it with no help. It wants to retard timing for a misfire condition. It did this with the previous tuning and is still doing it to me. If you run a stock file it does not pop, but you can hear the exhaust not change. The log I just did I accidentally did not save. How do you add a log file?
    Attached Files Attached Files

  9. #9
    Advanced Tuner MAIDENCR's Avatar
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    Its pilot related...put pilot timing to 15-18? should fix it
    03 cummins,175% flux injectors,dual cp3,s467.7/83 1.00
    Nv5600 with valair triple disc clutch

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    Like said above, pilot timing related

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    Advanced Tuner MAIDENCR's Avatar
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    my timing table look like thisUntitled.jpg
    03 cummins,175% flux injectors,dual cp3,s467.7/83 1.00
    Nv5600 with valair triple disc clutch

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    Not much point in sloping it down to zero on the high end, main timing just pushes it back up if it?s too close.

  13. #13
    Advanced Tuner MAIDENCR's Avatar
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    I used this method to make sure it doesnt pop
    03 cummins,175% flux injectors,dual cp3,s467.7/83 1.00
    Nv5600 with valair triple disc clutch

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    Just saying... if you put pilot timing lower than main timing then main timing will push pilot timing back above main timing so the minimum separation value is maintained.

  15. #15
    Even if pilot timing is zeroed out here? Is it still active in the tune? Annotation 2020-08-30 131010.png

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    Advanced Tuner MAIDENCR's Avatar
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    but pilot timing is timing before main.....so its always main degree plus pilot degree...until pilot shut off
    03 cummins,175% flux injectors,dual cp3,s467.7/83 1.00
    Nv5600 with valair triple disc clutch

  17. #17
    Jim P are you saying you should change Min. Pilot to Main Time to zero so that the computer doesn't try to move it back to 250us?

  18. #18
    I thought if you zeroed out pilot mm3 it would no longer use pilot at those rpms and main mm3?

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    Quote Originally Posted by Sschulte16! View Post
    Even if pilot timing is zeroed out here? Is it still active in the tune? Annotation 2020-08-30 131010.png
    Thats pilot injection quantity...

    To shut off pilot injection yes you zero out there but as an FYI the cells with zeros in them that are beside cells with a value higher than zero can still have some pilot fuel injecting due to interpolation of cells.

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    Quote Originally Posted by Sschulte16! View Post
    Jim P are you saying you should change Min. Pilot to Main Time to zero so that the computer doesn't try to move it back to 250us?
    Not what i said at all.