Coil Dwell Disassem and Denso Coil Behavior

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Sep 25, 2015, 08:58 PM

#31

mrfred

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Quote:

Originally Posted by Fireescape

Hey MrFred. Any chance of reposting the tables for 8859 from post 1. The EvoM code bug won't allow me to see it and a fix doesn't seem to be available. Not sure if there's some way of posting it up thay allows it to be seen, maybe a pm, hopefully there is. Thanks.

Quote my original post, and you'll see the tables in the quote region.

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Oct 3, 2015, 04:08 PM

#32

SkyNight

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Where is the "CoilDwellTimeUpperBoundPercent" scaling?

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Oct 3, 2015, 04:15 PM

#33

mrfred

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Quote:

Originally Posted by SkyNight

Where is the "CoilDwellTimeUpperBoundPercent" scaling?

Looks like those have been erased as a result of the forum software update. I'll add them back shortly.

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Oct 3, 2015, 04:47 PM

#34

mrfred

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Now updated.

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Oct 4, 2015, 12:05 AM

#35

georg1970

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Have you ever experienced any coil overheating with increased dwell time?

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Oct 4, 2015, 12:35 AM

#36

SkyNight

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88570008

Code:

  &lt;table name="Ign Coil Base Dwell-Time" category="Ignition - Coil Dwell" address="35fc" type="2D" level="2" scaling="CoilDwellTime"&gt;
  &lt;table name="Battery" address="5f00" type="Y Axis" elements="9" scaling="BatteryVoltage"/&gt;
  &lt;/table&gt;

  &lt;table name="Ign Coil Dwell-Time Reduction Start RPM" category="Ignition - Coil Dwell" address="1346" type="1D" level="2" scaling="RPMInverse-16"/&gt;

  &lt;table name="Ign Coil Dwell-Time RPM Reduction Factor" category="Ignition - Coil Dwell" address="360c" type="2D" level="2" scaling="Percent256-8"&gt;
  &lt;table name="Battery" address="5f00" type="Y Axis" elements="9" scaling="BatteryVoltage"/&gt;
  &lt;/table&gt;

  &lt;table name="Ign Coil Dwell-Time Upper Bound" category="Ignition - Coil Dwell" address="361c" type="2D" level="2" scaling="CoilDwellTimeUpperBoundPercent"&gt;
  &lt;table name="Battery" address="5f00" type="Y Axis" elements="9" scaling="BatteryVoltage"/&gt;
  &lt;/table&gt;

  &lt;table name="Ign Coil Dwell-Time Cranking" category="Ignition - Coil Dwell" address="35fc" type="1D" level="2" scaling="CoilDwellTime"/&gt;

  &lt;table name="Ign Coil Dwell-Time Cranking Upper Bound" category="Ignition - Coil Dwell" address="361c" type="1D" level="2" scaling="CoilDwellTimeUpperBoundPercent"/&gt;

Last edited by SkyNight; Oct 4, 2015 at 12:41 AM.

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Oct 4, 2015, 09:39 AM

#37

mrfred

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Quote:

Originally Posted by georg1970

Have you ever experienced any coil overheating with increased dwell time?

Not yet. I'm actually more worried about melting the ground wire. It seems to happen sometimes, probably from circuit course use where coil charging takes up a higher fraction of the time.

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Oct 13, 2015, 09:52 PM

#38

Eisen7

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Thanks for the info mrfred, Merlin and Aaron at ER in this and the other thread here (https://www.evolutionm.net/forums/ec...ecu-again.html)

I've just upgraded to a new COP kit similar to the Spoolinup one which uses new Denso/Yaris coils. Thought I'd post up some settings and results to show how it behaves. Still more changes to make to the reduction factor table by the looks as you can see it's dropping too much off the dwell as the rpms increase. Also not sure if I'm being too conservative with the dwell settings, but this is what the supplier recommended (~2.45ms @ 13.8v to keep the coils from overheating).

Here's an extract of a 3rd gear pull showing coil dwell and voltage. In the full log, you can see the dwell start to drop after it passes the dwell time reduction rpm at 2800.

Here's the settings I used in this log:

Attached is the full log. This was on Aussie 98 octane (similar to your 93) running BPR8ES plugs gapped to 0.65mm (25.5 thou).
EvoScanDataLog_2015.10.14_COPTest.csv

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Oct 14, 2015, 12:22 AM

#39

merlin.oz

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If you have the Denso/Yaris coils you can zero off the reduction table.

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Oct 14, 2015, 01:05 AM

#40

burgers22

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Did I miss the MUT request address to log dwell, or have I misinterpreted the method Eisen 7 used?

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Oct 14, 2015, 04:44 AM

#41

Eisen7

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Thanks Merlin, will try that. I'm actually getting a bit of spark breakup or something at peak boost around 4000rpm in that log, so maybe this is the cause. Will see how it goes

Burgers - here's the xml I added to my EvoScan 'Mitsubishi MUTII EFI.xml' to log dwell. Merlin posted it in the other thread, but the forum bug was hiding it, so I had to quote his post to see it. It's still doing odd things and won't let me post the code here, so hopefully it attaches instead.

CoilDwell.txt

Last edited by Eisen7; Oct 14, 2015 at 04:47 AM.

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Oct 14, 2015, 06:25 AM

#42

burgers22

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Cool, got it thanks.

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Oct 14, 2015, 08:58 AM

#43

mrfred

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Quote:

Originally Posted by merlin.oz

If you have the Denso/Yaris coils you can zero off the reduction table.

I think what allows this is the subsize wiring preventing full voltage from being reached at the coils, so even though EvoScan might say 14 V, the coil is seeing less, at least that's what I saw when I was monitoring voltage at the coil.

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Dec 8, 2015, 12:38 PM

#44

gtpumps

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With the Denso coil current limiting at around 2.5ms (according to mfreds graph) there is no point running anymore dwell than that you will not get anymore energy. However as mfred says if there is a current supply issue due to wiring issues it will need more time to reach the current limit.