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Coil Dwell Disassem and Denso Coil Behavior

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Old Apr 4, 2016, 02:38 AM   #46
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PHP Code:
  scaling name="CoilDwellTime" units="ms" toexpr="x*0.064" frexpr="x/0.064" format="%.2f" min="0" max="16.32" inc="0.064" storagetype="uint8" endian="big"/>
  
scaling name="CoilDwellTimeUpperBoundPercent" units="% of Eng Revolution Time" toexpr="100*x/256" frexpr="256*x/100" format="%.1f" min="0" max="100" inc="1" storagetype="uint8" endian="big"/>
  
scaling name="Percent256-8" units="%" toexpr="100*x/256" frexpr="256*x/100" format="%.2f" min="0" max="99.609375" inc="0.00390625" storagetype="uint8" endian="big"/>
  
scaling name="RPMInverse-16" units="RPM" toexpr="7500000/x" frexpr="7500000/x" format="%.0f" min="0" max="10000" inc="60" storagetype="uint16" endian="big"/>
  
scaling name="Percent128" units="%" toexpr="x/1.28" frexpr="x*1.28" format="%.0f" min="0" max="100" inc="1" storagetype="uint8" endian="big"/>

  
  
  <
table name="Ign Coil Base Dwell-Time" category="Ignition - Coil Dwell" address="3cc6" type="2D" level="2" scaling="CoilDwellTime">
  <
table name="Battery" address="6f14" type="Y Axis" elements="9" scaling="BatteryVoltage"/>
  </
table>

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

  <
table name="Ign Coil Dwell-Time RPM Reduction Factor" category="Ignition - Coil Dwell" address="3cd6" type="2D" level="2" scaling="Percent256-8">
  <
table name="Battery" address="6f14" type="Y Axis" elements="9" scaling="BatteryVoltage"/>
  </
table>

  <
table name="Ign Coil Dwell-Time Upper Bound" category="Ignition - Coil Dwell" address="3ce6" type="2D" level="2" scaling="CoilDwellTimeUpperBoundPercent">
  <
table name="Battery" address="6f14" type="Y Axis" elements="9" scaling="BatteryVoltage"/>
  </
table>
  
   <
table name="Ignition Coil, Dwell Time Correction 2" category="Ignition - Coil Dwell" address="3ce6" type="2D" level="2" scaling="Percent128">
 <
table name="Battery" address="6f14" type="Y Axis" elements="9" scaling="BatteryVoltage"/>
 </
table

Last edited by conroe; Apr 4, 2016 at 10:34 AM.
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Old Sep 29, 2016, 08:27 AM   #47
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Quote:
Originally Posted by mrfred View Post
Thanks for doing 9417. A heavier gauge wiring solution would be a nice feature, but its not absolutely necessary. For the rpm range we run, the main issue with stock wiring is that it might get a bit warm, or even hot. A heavier gauge solution would eliminate this issue. Coil output would be the same either way as long as the dwell was increased for the stock wiring as noted in one of my earlier posts.
Mr Fred, you bring up an interesting point. I'm troubleshooting an ignition issue that only shows up once the car is fully warmed up and been driving for a while. Until that point, everything runs flawlessly. When it acts up, the car sputters all through the rpm range and is extremely sluggish. I can smell gas and it seems to be a cylinder mis-fire or no-fire.

My car was tuned on stock coils and a few months ago I upgraded to the Denso COP and haven't touched the tune. My plugs are stock and all gapped at .020" Should I start with increasing the dwell time slightly as you've mentioned in this thread? Do you have any other suggestions? Thanks.
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Old Sep 29, 2016, 09:26 AM   #48
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Quote:
Originally Posted by Hookah Bazooka View Post
Mr Fred, you bring up an interesting point. I'm troubleshooting an ignition issue that only shows up once the car is fully warmed up and been driving for a while. Until that point, everything runs flawlessly. When it acts up, the car sputters all through the rpm range and is extremely sluggish. I can smell gas and it seems to be a cylinder mis-fire or no-fire.

My car was tuned on stock coils and a few months ago I upgraded to the Denso COP and haven't touched the tune. My plugs are stock and all gapped at .020" Should I start with increasing the dwell time slightly as you've mentioned in this thread? Do you have any other suggestions? Thanks.
The fact that you are seeing issues across the rpm range suggests to me that additional dwell is not needed. Also, these Denso COPs function just fine on the stock dwell settings. So there seems to be an issue unique to your Evo. Assuming your Evo is not a rustbucket from the saltbelt where there is likely to be a greater chance of grounding issues, my first thought is that one of your Denso coils has gone bad. My suggestion would be to purchase a replacement coil and swap it out with the existing ones on a one-by-one basis. If no issues there, then my suggestion would be to trace down the coil power wiring and look for possible grounding issues or other oddities with the wiring.
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Old Sep 29, 2016, 10:08 AM   #49
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Quote:
Originally Posted by mrfred View Post
The fact that you are seeing issues across the rpm range suggests to me that additional dwell is not needed. Also, these Denso COPs function just fine on the stock dwell settings. So there seems to be an issue unique to your Evo. Assuming your Evo is not a rustbucket from the saltbelt where there is likely to be a greater chance of grounding issues, my first thought is that one of your Denso coils has gone bad. My suggestion would be to purchase a replacement coil and swap it out with the existing ones on a one-by-one basis. If no issues there, then my suggestion would be to trace down the coil power wiring and look for possible grounding issues or other oddities with the wiring.
It's been in the southeast it's whole life, so no corrosion issues there. I've got another coil on the way to test with. Thanks for the input
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Old Feb 23, 2017, 11:05 AM   #50
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the two cranking variables are defined to be the first cell in each table, or the 9.38v cell.
is that cell actually chosen exclusively during cranking or is the definition assuming 9.38v during cranking?
i replaced a dying little tiny battery with a good larger one and it messed up my cranking dwell pretty bad. im using d585 coils which auto-fire if they dwell too long so its advancing my timing and kicking back on my starter.

any help is appreciated.
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Old Feb 26, 2017, 04:23 PM   #51
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The dwell variables are selected based on the actual voltage during cranking. You can log battery voltage using Evoscan if you want to see what it is.
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