MS2 with V3 board. I have turned the dwell way down (2.5) and the transitor still get hot.
Any ideas?

 

Needed to change ignition signal for normal to inverted, and the over heating issue went away.

 

What's your setup? Are you running leadings only and driving the coil directly from the 'Squirt?

After switching to inverted, make sure that your ignition timing is still where it should be.

 

Yes Aaron,
I am running the T2 coil off the squirt. Can you answer a question? Is the T2 coil a coil, or a pair of coils in one structure? I am using leading plugs only and as a wasted spark, and not sure if I should have the ignition setting as single coil or wasted spark.

Do I need to modify Q16 if I am using a wasted spark set up? Will that cause additional stress on the transitor?

Thanks ~ JEB

 

I'm even more confused now. You're running only trailing? Or the trailing coil as leadings? Why in the world?

The trailing coil assembly is an ignitor with two channels, and then two seperate coils. There is a line to select the coil to fire (toggle) and then another line to fire the selected coil (trigger).

Wait, or are you referring to using a set of TII coils?

Can you maybe post a bit about how it's set up? Are you using FC trailing and leading? Sounds like you aren't using ignitors?

 

I really did not give you much information there, my apologies.

My car is running on leading plugs only. I am using a leading coil from a Turbo 2, with a plug wire to each spark plug. I am using just the coil, not the igniter. In the past I have used this set up with an MSD, and fired the plugs in a wasted spark configuration.

Now the coil is fired from the igniter inside the Megasquirt (MS2 v3 – Megasquirt Extra). I was having issues with Q16 getting hot until I changed the ignition signal to inverted. Heat is no longer the issue.

Today my questions are around the coil, settings, and the igniter.

Is the T2 leading coil a single coil, or two coils inside of one unit? And, should it be set on the ignition screen as “single coil,” or “wasted spark.” I understand that if the internal igniter is set to fire wasted spark there is a modification that should be made to the igniter to help with the extra load.

I have also attached my msq file, would you take a look? Do you have any suggestions for me? Thank you for your time ~ JEB

 

You shouldn't be using Q16 at all with the ignitor.

You need to add a pullup resistor to each status LED as instructed here:
How To Megasquirt Your 2nd Gen RX-7: Building and/or Modding The Megasquirt

Then turn rotary mode on, select FC ignition, and connect your leading ignitor up to D14 as one would in a 2nd gen.

The leading coil is just one double ended coil.

I can't open your MSQ. It's not your fualt, I've just been having a real problem opening MSQs lately because I have no idea whether they are created in TunerStudio (seems to be a binary format) or MegaTune (XML) and neither one of those programs will open yours. Once unzipped the file has no extension.

 

The reason you had to switch the output polarity is b/c you're not using the stock ignitor. With the stock ignitor things are set up the way Aaron says. If you connect directly to the IGBT in the MS, you need to switch the output polarity and then recheck your timing.

Ken

 

Thank you gentlemen,
I appreciate your input. I am a strong learning curve and coming closer to an understanding.
Thanks again for your time ~ JEB