EJ20G ignitor question

Splinter · Post by **Splinter** » Wed Jan 10, 2007 3:30 pm

For various reasons, I dont want to go coil on plug. I also have to put in an MSD DIS-2 system. So, anyone know how I would go about hooking the the EJ20G wiring harness and EJ22T ignitor up to the EJ22T coilpack, through the MSD?

Post by **Legacy777** » Fri Jan 12, 2007 12:58 am

Which ECU are you using?

Splinter · Post by **Splinter** » Fri Jan 12, 2007 1:09 am

Autronic WRX 94-96 replacement board

Post by **Legacy777** » Fri Jan 12, 2007 1:13 am

So you're still using the "stock" ecu which was 4-triggers....to run the ignition?

I'm not really sure how you'd convert that to a wasted spark setup...

mikec · Post by **mikec** » Fri Jan 12, 2007 1:36 am

Run the channels for cylinder 1 and 2 to the front half of the ignitor and coil, and run cylinders 3 and 4 to the other half. Stick diodes on the leads coming out of the ECU, to protect the drivers.

At least, that makes sense in my head.

Splinter · Post by **Splinter** » Fri Jan 12, 2007 1:41 am

What exactly does the ignitor do?

Matt Monson · Post by **Matt Monson** » Fri Jan 12, 2007 9:16 pm

Why aren't you using a DIS-4?

Splinter · Post by **Splinter** » Fri Jan 12, 2007 10:53 pm

Havent gotten the unit yet.

Would it make it easier?

Matt Monson · Post by **Matt Monson** » Mon Jan 15, 2007 11:10 pm

Yes. It's 4 channel versus 2 channel.

Splinter · Post by **Splinter** » Tue Jan 16, 2007 12:11 am

haha! I figure it out I think.

The ignitor basically just acts as a ground control box.

All the coils get a constant 12V+ supply. When the ecu fires a cylinder, it sends a signal level pulse to the ignitor, which opens a ground path for that coil.

Therefore, if I take the USDM coilpack, hook up the 1/2 coil to both the 1 and 2 outlets of the JDM ignitor, it'll ground whenever either path is activated, so it'll run wasted spark. Also do the same for the 3/4 signals

Matt Monson · Post by **Matt Monson** » Tue Jan 16, 2007 7:06 pm

Or you could run modern WRX coils, which have individual built in ignitors. This is what I am going to do long term on my car...

Splinter · Post by **Splinter** » Tue Jan 16, 2007 11:43 pm

Then I have to figure out how to wire them, and I have to buy the coils

I dont have the manifold harness for the EJ20G

legacycentral bbs

A forum for 89-94 BC-BF(BJ) Legacy Owners and Fans

EJ20G ignitor question

EJ20G ignitor question