So you want to ditch your 30 year old coils and plug wires for something cleaner, but don't want the issues that come with running 300m coils in wasted spark, or the problematic CDI's that tie in with the 300m COP.
The EVO community has been using Denso coils for COP with great success in 800+ hp setups with no CDI required. They're a cheap, reliable and comparatitvely powerful coil to the stock DSM coils, however these can eliminate the factory ignition control module, factory coil packs, and the spark plug wires all in one.
If you're looking for an ignition improvement over the factory DSM coil packs, chances are these are not going to improve over good OEM coils.
There are a few guys that have been successfully running these in DSM's, but I have yet to find a good guide on wiring them and having proper tach functions as you will be eliminating the PTU at the same time. I like the cleanliness of COP and I will say in comparison they are a better setup all around, I run a sparktech kit using the same coils on the 2.3/FP black in my EVO and have had zero issues with it the past 8 or so years it's been on there.
The reason these work so much better than the 300m coils is due to the fact that the 300m coils have to be wired in series to be properly fired by the factory PCM. Wired in parallel has too much load due to their resistance and will either blow up the PTU or blow up the driver in the ecu. Wiring them in series however drops their output way lower than they would be if fired sequentially. The Denso coils have a built in igniter so the computer doesn't carry any of the load of the coil firing, which allows us to wire them "sequentially" but still fire them as a wasted spark coil like stock.
Into the guide, what you'll need:
4x Denso coils - Prius coils are what SparkTech uses for their Evo COP, however almost any 4 wire Toyota coil will work fine as long as it's the same style as the Prius coils. In my pictures I'm using some random Toyota coil packs that I had laying at work. You're looking for this style ideally
Next you need 4x matching connectors- Spoolin Up used to sell these as pin your own kits, you can also find these online from various vendors. I pulled mine from a junkyard Toyota. Just make sure they're 4 wire and you'll be good to go.
Next you'll need a small length of wire or if you're cutting out junkyard connectors remove as much of the harness as you can with them.
Next on the list is either a junk 2g MAF, like I used, or if someone knows where to get a male PTU connector as a pin-it kit I'll gladly edit that in. I asked ECMTuning, Ohm Racing, and a few other manufactures on obtaining a male either 2g MAF connector or the PTU connector and none of them got back to me on it. The 2g MAF uses the correct connector and they aren't too hard to gut out of the MAFs housing.
You'll need to figure out a mounting plate for hold the coils. I traced a plug wire cover onto a sheet of aluminum and cut mine out with an angle grinder. The plate is setup for Prius coils, however, since I didn't have Prius coils on hand when I assembled it for testing I had to put some nuts under the coils to mount properly. As far as I know no one makes a plate for these off hand.
Wiring for these is fairly simple, we'll go back to the picture posted above of the connector to start.
On the Coil Connector:
Pin #1 is the 12v feed.
Pin #2 is a tach output signal.
Pin #3 is the trigger to fire the coil.
Pin #4 is the ground.
On the MAF/PTU connector: (you'll have 8 male pin slots in the connector itself, but only 7 legs on the back side. The 2g MAF doesn't use pin 8 so go to the side of the connector with the missing pin and mark it so you know which side is pin 8.)
Pin #2 - Combine Pin #3 for Denso coils 2 and 3, these 2 wires will run to Pin #1 of the MAF connector. Trigger B
Pin #3 - Combine all of Pin #4 wires off the Denso coils, they all run to Pin #3 of the MAF connector. Ground
Pin #4 - Combine Pin #2 from Denso coils 1* and 2*, these 2 wires will run to Pin #4 of the MAF connector. Tach Output
Pin #6 - Combine all of the Pin #1 wires off the Denso coils, they're all going to be run to Pin #6 of the MAF connector. 12v coil feed.
Pin #7 - Combine Pin #3 for Denso coils 1 and 4, these 2 wires will run to Pin #7 of the MAF connector. Trigger A
*Note: These wires are the tach output, if you combine all 4 coils together you'll have double the RPM reading on your tach. We combine 1 and 2 as they're on opposite banks of the firing order. You can combine 1/2, 1/3, 2/4, or 3/4 and still get the same accurate RPM reading, 1/2 are just closest to the connector and require the least amount of wiring. If you don't have these combined properly you're tach will not work properly.
I used crimp on connectors and then solder them to the MAF connector. This isn't the most ideal way to do this and where a pin kit would be much nicer. It is solid and works fine though for now.
Loom the wiring, plug everything in, test to make sure it runs on all 4 cylinders and the tach is reading accurate. Then you can remove both the stock coil packs and the ignition module and enjoy the new COP setup.
I'm currently using these on my 91 galant with a 210K mile stock 6 bolt with an FP red and supporting mods. I didn't have any issues with my original coils, but I like that I was able to ditch a couple fail points of the stock ignition system. There's definitely cleaner ways to orient these, but the angle on these specific coils made it a pain.
This should work on a 90 as well, however, you'll need a different male connector and the wiring is slightly different. My 90 is currently still tore apart in the back corner of my garage, but I do plan to update this guide with the proper 1990 wiring specs.
The EVO community has been using Denso coils for COP with great success in 800+ hp setups with no CDI required. They're a cheap, reliable and comparatitvely powerful coil to the stock DSM coils, however these can eliminate the factory ignition control module, factory coil packs, and the spark plug wires all in one.
If you're looking for an ignition improvement over the factory DSM coil packs, chances are these are not going to improve over good OEM coils.
There are a few guys that have been successfully running these in DSM's, but I have yet to find a good guide on wiring them and having proper tach functions as you will be eliminating the PTU at the same time. I like the cleanliness of COP and I will say in comparison they are a better setup all around, I run a sparktech kit using the same coils on the 2.3/FP black in my EVO and have had zero issues with it the past 8 or so years it's been on there.
The reason these work so much better than the 300m coils is due to the fact that the 300m coils have to be wired in series to be properly fired by the factory PCM. Wired in parallel has too much load due to their resistance and will either blow up the PTU or blow up the driver in the ecu. Wiring them in series however drops their output way lower than they would be if fired sequentially. The Denso coils have a built in igniter so the computer doesn't carry any of the load of the coil firing, which allows us to wire them "sequentially" but still fire them as a wasted spark coil like stock.
Into the guide, what you'll need:
4x Denso coils - Prius coils are what SparkTech uses for their Evo COP, however almost any 4 wire Toyota coil will work fine as long as it's the same style as the Prius coils. In my pictures I'm using some random Toyota coil packs that I had laying at work. You're looking for this style ideally
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Next you need 4x matching connectors- Spoolin Up used to sell these as pin your own kits, you can also find these online from various vendors. I pulled mine from a junkyard Toyota. Just make sure they're 4 wire and you'll be good to go.
You must be logged in to view this image or video.
Next you'll need a small length of wire or if you're cutting out junkyard connectors remove as much of the harness as you can with them.
Next on the list is either a junk 2g MAF, like I used, or if someone knows where to get a male PTU connector as a pin-it kit I'll gladly edit that in. I asked ECMTuning, Ohm Racing, and a few other manufactures on obtaining a male either 2g MAF connector or the PTU connector and none of them got back to me on it. The 2g MAF uses the correct connector and they aren't too hard to gut out of the MAFs housing.
You must be logged in to view this image or video.
You'll need to figure out a mounting plate for hold the coils. I traced a plug wire cover onto a sheet of aluminum and cut mine out with an angle grinder. The plate is setup for Prius coils, however, since I didn't have Prius coils on hand when I assembled it for testing I had to put some nuts under the coils to mount properly. As far as I know no one makes a plate for these off hand.
Wiring for these is fairly simple, we'll go back to the picture posted above of the connector to start.
On the Coil Connector:
Pin #1 is the 12v feed.
Pin #2 is a tach output signal.
Pin #3 is the trigger to fire the coil.
Pin #4 is the ground.
On the MAF/PTU connector: (you'll have 8 male pin slots in the connector itself, but only 7 legs on the back side. The 2g MAF doesn't use pin 8 so go to the side of the connector with the missing pin and mark it so you know which side is pin 8.)
Pin #2 - Combine Pin #3 for Denso coils 2 and 3, these 2 wires will run to Pin #1 of the MAF connector. Trigger B
Pin #3 - Combine all of Pin #4 wires off the Denso coils, they all run to Pin #3 of the MAF connector. Ground
Pin #4 - Combine Pin #2 from Denso coils 1* and 2*, these 2 wires will run to Pin #4 of the MAF connector. Tach Output
Pin #6 - Combine all of the Pin #1 wires off the Denso coils, they're all going to be run to Pin #6 of the MAF connector. 12v coil feed.
Pin #7 - Combine Pin #3 for Denso coils 1 and 4, these 2 wires will run to Pin #7 of the MAF connector. Trigger A
*Note: These wires are the tach output, if you combine all 4 coils together you'll have double the RPM reading on your tach. We combine 1 and 2 as they're on opposite banks of the firing order. You can combine 1/2, 1/3, 2/4, or 3/4 and still get the same accurate RPM reading, 1/2 are just closest to the connector and require the least amount of wiring. If you don't have these combined properly you're tach will not work properly.
I used crimp on connectors and then solder them to the MAF connector. This isn't the most ideal way to do this and where a pin kit would be much nicer. It is solid and works fine though for now.
You must be logged in to view this image or video.
Loom the wiring, plug everything in, test to make sure it runs on all 4 cylinders and the tach is reading accurate. Then you can remove both the stock coil packs and the ignition module and enjoy the new COP setup.
I'm currently using these on my 91 galant with a 210K mile stock 6 bolt with an FP red and supporting mods. I didn't have any issues with my original coils, but I like that I was able to ditch a couple fail points of the stock ignition system. There's definitely cleaner ways to orient these, but the angle on these specific coils made it a pain.
This should work on a 90 as well, however, you'll need a different male connector and the wiring is slightly different. My 90 is currently still tore apart in the back corner of my garage, but I do plan to update this guide with the proper 1990 wiring specs.
You must be logged in to view this image or video.
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