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Thread: Tune Not Following Tables

  1. #1
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    Default Tune Not Following Tables

    Can someone tell me why this tune is following the Non-DSP tables and if it is only an at idle thing? I've also noticed through logs that the timing in the DSP 1-4 tunes jumps around. At times it seems to follow the DSP 1-4 timing but at others it has jumped to the Non-DSP timing tables. I also noticed in the DSP 1-4 tables the fuel pressure info is wrong at least down low so it is probably good it is referring to the Non-DSP fuel because otherwise it would be idling at 60MPA. Any insight would be appreciated.
    Thanks.
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Name:	DSP2 Fuel Pressure Wrong.PNG 
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  2. #2
    Lifetime Member GMC-2002-Dmax's Avatar
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    Log the switch values, I have seen cheap switches have resistor values be off enough to flip flop between tunes, if that does not stay a stable voltage it will be jumping around.
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


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    Quote Originally Posted by GMC-2002-Dmax View Post
    Log the switch values, I have seen cheap switches have resistor values be off enough to flip flop between tunes, if that does not stay a stable voltage it will be jumping around.
    Thanks. The switch is good. Those screen shots are all from the same log. The only time my switch changes state is when I move it. The Fuel tables are all off compared to the Non-DSP table. Look at these 2 screenshots. The Fuel pressures are about 3 columns off most likely due to the scaling across the top. For example at 45mm3 and 12000 RPM the Stock Non-Dsp table is 80mpa the DSP 1-4 tables are 120MPA. The Entire tables are off that way.
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Name:	Non DSP Fuel Table.PNG 
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  4. #4
    Lifetime Member IdahoRob's Avatar
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    Its been that way since LMM tuning can out. It has been brought up in the past but nothing has been addressed. The RPM scaling is off in the DSP tables, you'll have to tune around it.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

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    Quote Originally Posted by IdahoRob View Post
    Its been that way since LMM tuning can out. It has been brought up in the past but nothing has been addressed. The RPM scaling is off in the DSP tables, you'll have to tune around it.
    Thank Rob. So just treat it like it's scaled like the Non DSP table?

  6. #6
    Lifetime Member IdahoRob's Avatar
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    Correct, the other issue you will run into is that the rail pressure at idle has a limiter somewhere and you cannot use the rail pressure table at idle to raise the pressure. It doesn't do anything unlike the earlier models. It can be done, but need to work around it with the other available base fuel tables.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  7. #7
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    Quote Originally Posted by IdahoRob View Post
    Correct, the other issue you will run into is that the rail pressure at idle has a limiter somewhere and you cannot use the rail pressure table at idle to raise the pressure. It doesn't do anything unlike the earlier models. It can be done, but need to work around it with the other available base fuel tables.
    Thanks for the tips Rob. I do have another issue I've been pulling my hair out on. Can I bug you some more?

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