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DME Questions/Flash Tune

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Hi Guys,

I got some questions about the DME as it pertains to flash tuning. Posted it over at N54tech, but figured this would be a good place too:

Load:

  • How is load calculated? Does the DME use DME PSI and pedal position to infer
    load?
  • Is max load then equivalent to when DME PSI is at 9psi or so (stock max) and
    the pedal is floored?
  • Can load be logged by the JB4?
  • What happens when you exceed the max load in the tables (if possible)
  • What does the load target table refer to? Is that the max load target at a
    given rpm assuming WOT? If so is the load target then scaled down linearly with
    pedal or throttle?
  • What is the load to torque limits and why are there 3 tables when everything
    else is in pairs based on banks?
  • What is torque limit cap?


Advance:

  • What tables affect advance? Is it only load/rpm, open loop, and then the
    spool table, or are there others?
  • What determines when the other tables are active and when they are active is
    it that their values take over entirely, blend, or are added to the base
    ignition timing table? For instance if you are in spool does the DME add the
    spool timing to base timing, or simply switch from the base timing table to the
    values in the spool table?
  • How do trims change advance? I thought advance was load/rpm based (at least
    that's what the tables seem to show), but Terry made a comment that seemed to
    indicate trims were involved in timing advance.


AFR/Fuel:


  • What tables affect AFR besides bank 1 and 2 main fuel tables?
  • What is open loop, how does it affect fuel calculations, and when is it
    active?
  • I see fuel AFR max target is 14.7:1 or so, but I know the fueling goes
    leaner than that at times. What is driving this?


Lastly, is there a table that shows the calculations/formulas that link tables to each other? Its nice having the raw
data, but it would be great to know when one table is being called upon and when it is being ignored for something else.

Thanks!

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