They are actually closer to 100mJ. It's your thread though so I won't clutter it up.

 

OK, I found the specs for this coil and it is as follows:

Toyota 90919-02240 (Denso 673-1306)
Max Usable Dwell: 3ms
Dwell: 2ms/3ms
Primary Current: 6.5a/11a
Spark Energy: ~47mJ/~52mJ

In looking at the data I believe this was at 14V.

 

Where did that data come from?

I had found a datasheet on Denso's website about a year ago when I was looking at the COP stuff. Denso has 20 different websites and I don't recall which it was on so I wasn't successful with a quick search today. I'll see if I saved it on my home computer as it's not on my work computer.

You planning on doing anything in particular that could potentially need more spark then what the Densos can do? They’ve done 900HP on E85 when gapping down to 0.015-0.020”. Not exactly an easy task. There is definitely room for improvement on opening the gap up for low load drivability though.

 

I am trying to sure up the ignition in preparation for running the flex fuel setup in the Haltech. After I install my 10:1 CB 2L I will go down that path, but you need a good foundation.

50mJ of spark energy is a lot so don't get me wrong, but there is likely a benefit to 120mJ. Remember, the energy is not the peak output, but the total area under the curve. If I can extend the spark duration and increase peak output that potentially has added benefit to cylinder efficiencies. This is especially critical on a high compression - high boost application.

 

I searched through everything I have and did some more on the internet and I can't even find a site that looks familiar to where I found it a year or so ago. 50mJ will have to do as I can't prove other wise. HA

I did find a complete dwell time chart for them however.

 

that is actually a different part number as well as physically different...
90919-02230(angled plug) vs 90919-02240(straight plug)

However, I think those dwell times are correct. Although I say max usable dwell is 3ms, the graph I have actually shows the coil primary current goes flat from ~2.4ms to 3ms. From the dwell times you provided it shows 2.4ms @ 14v so that would match the data I have.

I am going to go with your numbers and see what happens.
8V 6.3 ms
9V 5.3 ms
10V 4.4 ms
11V 3.8 ms
12V 3.2 ms
13V 2.7 ms
14V 2.4 ms
15V 2.2 ms

 

Yeah, the coil above is the Corrolla S coil. I've had it side by side with the Yaris coil and I'd be pretty suprised if they are different internally as all the dimensions that would limit the internal coil geometry were the same. You are right though, different part number.

I did come across a thread where a guy ran the coil with like 3-3.5ms of dwell on a megasquirt and it burned them up. Something to keep in mind.


I thought somebody on this board actually had a test rig to test out dwell time? I've got access to everything I would need at work, but it might draw a little too much attention...

 

UPDATE:

I am just about done as the remaining plug wires arrived and I have verified fitment. I started the wiring harness and completed the coil side of all the connectors, but have to wait to finish. I ordered some of that fancy Mil Spec heat shrink tubing and wire covers so I can't finalize the wiring until that arrives. It is likely only 1-2hrs of work and I hope to have the stuff in by Thursday. If you are wondering about the copper bolt at the end of the mounting plate that is for the coil ground, which I will connect to the battery ground.

 

UPDATE:

The heat shrink tubing and wiring covers arrived today so I finished the harness. Installed the setup and downloaded the new dwell times. Car fired right up and runs well. Drove the car and all seems fine, but when I go into boost above 20psi the car breaks up badly.

I am unsure what the cause so I am going to swap to some copper plugs and see if that clears the issue. Only problem is that for the IX you only have a heat range of 6 available in copper (LFR6A-11). I will buy the plugs tomorrow to see if that solves the issue.

Suggestions are welcome for other things I should look into as to the cause of the severe misfires.

 

What are, and can you adjust, your max and min dwell?

 

Dwell is adjustable and I am running the recommended max. I did lower by 2ms across the board and the issue remained.

8V - 7.9ms
10V - 6.4ms
12V - 5.5ms
14V - 5.0ms
16V - 4.6ms

 

nvm

 

Watch out with those 6s. They will cause sever issues at high boost. Long ago I tested 6, 7, and 8 on the same day at the track. Found 4mph and far less tendency for detonation from the 6s to the 8s.

Just some thoughts:
1. Check for signs of external arcing on the plug wires.
2. Run a wire from the coil body directly to the head to ensure good grounding.
3. Add a noise filter to the power line.

 

Thank you for the input. For the EVO IX the only copper plug I found compatible was in a heat range of 6 (LFR6A-11) because they don't make an LFR7A-11. I will post picture later next to the ILFR7H.

For your recommendations:
1) no signs of arcing
2) each coil has a seperate ground wire that I have run to the battery ground
3) I will try a 1uF capacitor across the power/ground wire

 

this isn't like a stack of ring terminals under a bolt is it?