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Thread: Some more flatline progress

              
  1. #1
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    Some more flatline progress

    Making some good progress on the flatline fix front. It's been countless hours logging and testing but have developed a solid understanding of the issue and how to work around it. Click here to enlarge

    These are from our previously flatline prone IJEOS 135i.
    Attached Images Attached Images   
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    very nice T!
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    I assume this is with meth and just not shown on the graph?
    09 e92 335i, 440HP/500TQ: SOLD
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
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    Making some good progress on the flatline fix front. It's been countless hours logging and testing but have developed a solid understanding of the issue and how to work around it. Click here to enlarge
    AWESOME news --- I called COBB on Thursday to see if any progress had been made & they said they've been actively working on it, but no timeline of when to expect a solution.
    COBB AP ProTune by Bren of ///Bren Tuning
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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
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    I assume this is with meth and just not shown on the graph?
    Running map 7, E40, and meth, for the last gas tank.
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    Click here to enlarge Originally Posted by benzy89 Click here to enlarge
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    AWESOME news --- I called COBB on Thursday to see if any progress had been made & they said they've been actively working on it, but no timeline of when to expect a solution.
    If they could locate and open up a few more tables it would make my life a lot easier! Click here to enlarge
    Burger Motorsports
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
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    Running map 7, E40, and meth, for the last gas tank.
    Anyway to squash meth undershoot? And congrats!

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    What is meth undershoot?
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    Good stuff..seems like cleaning up those WOT onset and post shift boost overshoots is the ticket here on the jb side


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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
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    What is meth undershoot?
    Its when you want to slam the entire syringe, but you pass out halfway through it.

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    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
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    Its when you want to slam the entire syringe, but you pass out halfway through it.
    Click here to enlarge
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
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    What is meth undershoot?
    I was referring to when the boost flatlines for a fraction of a second below finally rising to full target. Seems worse when meth is involved, just something I have noticed from looking at logs.

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    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
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    Its when you want to slam the entire syringe, but you pass out halfway through it.
    Hahaahahahha. Click here to enlarge

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    It appears you found a way to reduce the timing cut during an upshift as well.

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    Click here to enlarge Originally Posted by rudypoochris Click here to enlarge
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    I was referring to when the boost flatlines for a fraction of a second below finally rising to full target. Seems worse when meth is involved, just something I have noticed from looking at logs.
    Oh boost vs. target has to do with PID tuning, learned wastegate values, etc. I have not played with that in a long time. Once it gets within 1-2psi of target it relies on a small integral value to finally get up to target. Bumping up PID gain a bit will make the targeting a little more aggressive if that is what you are after. Down the road I'll probably revisit it.
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
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    Oh boost vs. target has to do with PID tuning, learned wastegate values, etc. I have not played with that in a long time. Once it gets within 1-2psi of target it relies on a small integral value to finally get up to target. Bumping up PID gain a bit will make the targeting a little more aggressive if that is what you are after. Down the road I'll probably revisit it.
    Yeah, I modified that for non meth, but see its worse in the meth logs I have looked at. I won't pass judgment until I personally try it though. The PID tweak may fix it no problem. Worst case the integral value just needs to reset when meth hits or something.

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
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    Oh boost vs. target has to do with PID tuning, learned wastegate values, etc. I have not played with that in a long time. Once it gets within 1-2psi of target it relies on a small integral value to finally get up to target. Bumping up PID gain a bit will make the targeting a little more aggressive if that is what you are after. Down the road I'll probably revisit it.
    Is boost overshoot post shift what's behind timing drops? I see, at least in these logs, boost on the upshift is cleaned up not to overshoot like before, but probably at the expense of some minimal lag...what if you bumped your pid gain and/or ran lag fix


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    No it has nothing to do with boost control. From the DME's perspective boost is always right on target unless we tell it to nudge the throttle, etc. There is an algorithm that tells it to report over target if JB4 boost is over target, so that the throttle safety remains active. And then there are some modifiers that determine how aggressive the JB4 is in closing the throttle if boost is over target. And other factors that determine how PWM is handled during shifts to avoid major overshoots. None of that has changed from the release of ISO. The flatline is a purely DME flash issue.
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
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    No it has nothing to do with boost control. From the DME's perspective boost is always right on target unless we tell it to nudge the throttle, etc. There is an algorithm that tells it to report over target if JB4 boost is over target, so that the throttle safety remains active. And then there are some modifiers that determine how aggressive the JB4 is in closing the throttle if boost is over target. And other factors that determine how PWM is handled during shifts to avoid major overshoots. None of that has changed from the release of ISO. The flatline is a purely DME flash issue.
    Ok cool. I know the flatline is some logic/table in the DME being tripped to cause it but I thought you fixed with JB4 only without needing any changes on the flash end.


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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
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    Ok cool. I know the flatline is some logic/table in the DME being tripped to cause it but I thought you fixed with JB4 only without needing any changes on the flash end.
    No, have not been able to fix it without a flash. I have some logic that sort of mimics what we're doing on the flash side and it's an improvement. But not a full fix.
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    Quick summary someone of this flatline issue please?

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    On some automatic cars when running higher boost levels timing drops dramatically after the shift due to some sort of internal DME torque reduction algorithm.
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
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    On some automatic cars when running higher boost levels timing drops dramatically after the shift due to some sort of internal DME torque reduction algorithm.
    Also happens on manual transmission cars.

    Neil

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
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    On some automatic cars when running higher boost levels timing drops dramatically after the shift due to some sort of internal DME torque reduction algorithm.
    And everyone experiences this?

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    Click here to enlarge Originally Posted by MDORPHN Click here to enlarge
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    Also happens on manual transmission cars.

    Neil
    The corrections seen on a 6MT are nowhere as bad as what the 6AT cars see. I know 6MT with NLS have a tendency to flatline though.

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