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Thread: Logging Cyl Air For SD Spark Tuning

  1. #1

    Logging Cyl Air For SD Spark Tuning

    I am having trouble with graphing spark. Trying to figure out how to get Cylinder Airmass calculated with no MAF present. I found some different maths provided by HPT and tried them. But I am either not doing it right. Or, it's not going to work correctly that way.
    Appreciate any help I can get.
    Thanks.
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  2. #2
    Senior Tuner mowton's Avatar
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    Log Dynamic Airflow and develop a cylinder charge parameter in User Defined math parameter slot. I call it Dynamic Cylinder Airmass or DCA. By the way, I use it all the time even with MAF as it is the final calculated airmass the PCM arrives at after filtering the MAF.

    Ed M
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  3. #3
    Ok does this look right?
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  4. #4
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    @mowton, he said SD, you're giving him MAF derived airmass. plus, might wanna mention that your conversion assumes number of cylinders.

  5. #5
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by redhardsupra View Post
    @mowton, he said SD, you're giving him MAF derived airmass. plus, might wanna mention that your conversion assumes number of cylinders.
    Afternoon Marcin, is not the Dynamic Airflow Parameter value developed as the final airflow value by the PCM and subsequently used to develop the cylinder charge value? If in SD and the MAF is failed, then I was led to understand the source of Dynamic Airflow parameter would be from the VE table. And yes, you are correct about the DCA, it is based on number of cylinders....guess I assume everyone has 8 :-) I take the HP Tuners developed ones in the Predefined math parameters and substitute Dynamic Airflow for MAF Airflow.

    Ed M
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  6. #6
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    You're right Ed. Or otherwise mine is pulling nonexistent MAF readings and showing them as dynamic airflow
    Post a log and tune if you want help

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  7. #7
    Ok I'm still having problems. I can get the graph to populate. But the DCA doesn't seem right. It actually goes to the lower scale at higher airflow? So I have attached the current file I am working in. Along with the layout I am trying to use. And the most recent log. You can see it picking up some KR and i would love to fix that.
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  8. #8
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by CRTD View Post
    Ok I'm still having problems. I can get the graph to populate. But the DCA doesn't seem right. It actually goes to the lower scale at higher airflow? So I have attached the current file I am working in. Along with the layout I am trying to use. And the most recent log. You can see it picking up some KR and i would love to fix that.
    Not sure why you were using WB in your spark graphs but I updated them. You may have to reload the DCA parameter in both as I am sure yours sits in a different Math Parametric slot than mine.

    Ed M
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  9. #9
    I really appreciate all the help guys. I have tried the revised layout. It appears to only populate the .08 cyl air row.
    Is the 3 bar SD causing issues?
    I was able to make an AFR error graph for the VE table. Still confused on the Cylinder Air vs RPM for the spark table.
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  10. #10
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    Dynamic airflow, make sure you are logging it. Add to channels list. I can't open log right now to check but that's the usual reason.
    Post a log and tune if you want help

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  11. #11
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by CRTD View Post
    I really appreciate all the help guys. I have tried the revised layout. It appears to only populate the .08 cyl air row.
    Is the 3 bar SD causing issues?
    I was able to make an AFR error graph for the VE table. Still confused on the Cylinder Air vs RPM for the spark table.
    As I said, take the attached Math parameter and save it to your Math folder (Documents>HP Tuners>VCM Scanner>Maths). Then, go to Tool>Math Parameters and go to User Defined...open. Go to first available slot (click on it) then go to the Folder icon (has a black fx on it) and double click it to open the Math folder. Find the DCA math you saved and double click it...this will load it to your Maths Parameter area. Then go to the Graph Row axis for both spark graphs and reload the parameter from the Math Parameters User defined slot you saved the DCA. Here it is again...

    Ed M
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  12. #12
    WOO HOO! Got it working finally. Thanks again so much!

  13. #13
    HP Tuners Owner Keith@HPTuners's Avatar
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    Ed, maybe we need to add this to the built in list?
    We got this guy Not Sure, ...

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    I recommend it

    And everyone knows how much weight my recommendations carry


  15. #15
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by Keith@HPTuners View Post
    Ed, maybe we need to add this to the built in list?
    Yes that would be great, thanks Keith. Been too busy to ask :-(

    And Marcins comment about number of cylinders is correct so we would need one for each # of cylinders like the MAF ones in the pre-defined now.

    Ed M
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  16. #16
    HP Tuners Owner Keith@HPTuners's Avatar
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    Quote Originally Posted by mowton View Post
    Yes that would be great, thanks Keith. Been too busy to ask :-(

    And Marcins comment about number of cylinders is correct so we would need one for each # of cylinders like the MAF ones in the pre-defined now.

    Ed M
    Can you whip up a few for each cylinder count?

    It's been so long since I've used dynamic cylinder air parameter, but with a name like that, you think it would be dynamic "per cylinder" air.. I'm a bet confused on the value being reported.
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  17. #17
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    Dynamic airflow is similar to MAF and VE airflow as far as units go, total airflow basically, not per cylinder
    Last edited by schpenxel; 11-02-2016 at 05:34 PM.

  18. #18
    HP Tuners Owner Keith@HPTuners's Avatar
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    maybe the parameter needs to be renamed to Calculated Airmass,....
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  19. #19
    Senior Tuner mowton's Avatar
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    Quote Originally Posted by Keith@HPTuners View Post
    maybe the parameter needs to be renamed to Calculated Airmass,....
    I use the name Dynamic Cylinder Airmass (DCA) only because it is derived from the Dynamic Airflow which in my world is the PCM's "final answer" for airflow. Calculated could be used as well but there is a cylinder airmass that most pcm's provide as well and believe they call that calculated cylinder aormass. Chris might be better suited to clarify if my understanding is correct. ...I would probably keep the chart name to DCA anyways as i have over the last 8 years :-)

    EdM
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  20. #20
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    what all changes in the math to log for a v6? is it just the number of cylinders?