Thread: Inductive coil tech, coil-on-plug (COP) tech and more.

Likely N/A V8 engines aren't going to have powerful individual coils. They don't need it. Each cylinder only makes around 35 HP when something like the RWD SR20 made around 55 HP per cylinder. But really that's just a guess.

2.5ms dwell for FULL charge. They are a little slower, but they have alot of punch behind them.

They work great and you can isolate from heat, but are expensive and bulky like I said.

Go with CDI box with COPs. It will work for sure.

Formula 1 engines use motorcycle style COP + CDI box.

but like you said they are not that much hp per cylinder. V12's with 600hp or so. This is rough estimate btw. Their engines are more about rev's than hp.

But hey i could be wrong.

Just need something with a strong output to keep misfire at bay.

CDI box with COPs is about as strong as it gets for output.

I cannot think of any combination of oem individual coils that could come close to the output of CDI box with COPs or true individual race coils. Pay to play, but you will have bullet proof ignition package with the CDI box and COPs... Bonus is that you can switch it over to alot of other motors and keep running it down the road.

I believe the turbo F1 cars from the 80's used the same tech. I could be wrong though.
Yah I guess you want to find out what the top fuel guys use... =P

No really, CDI + weak COP is plenty. The 2kHP Supras use it.

So the CDI box with some motorcycle COP's will work perfect then, or do you suggest an automotive COP over the motorcycle. I know the auto ones are a bit larger coils than the motorcycle ones but if they will produce a bullet proof spark with the CDI box i will go that route. Roughly $350 or so for a good ignition.

Im assuming your cdi box supplies your coils with a higher output voltage as well and i would assume your normal ecu coil triggers connect directly to the CDI box to trigger it.

I guess ill find out when i buy it and read through the directions.

Motorcycle COP with CDI box yes. Automotive (stronger) COP will either overheat quickly when driven by CDI or provide so much voltage that it becomes un-insulateable and goes wherever it wants.
(Motorcycles run CDI + COP and that's why their coils are "weaker" because they have CDI behind them. They are weaker for good reason.)

The CDI box supplies the coils with a higher input voltage and coils are just voltage multipliers so yes the output voltage is higher as well.

Yah, but the wiring changes a little if you're driving four coils instead of one. The CDI box needs four trigger inputs instead of just the one from your previous factory coil. So a couple more wires need to be run from the AEM EMS.


I really need to add a section at the beginning of this thread on CDI boxes.

yeah i got that. your ecu from the factory only has one coil trigger that runs from the ecu to the ignitor.

Im assuming with the use of the CDI box you no longer have a need for an ignitor, just run the 3 extra wires for coil triggers for each cylinder, 4 total triggers to the CDI box. Im guessing it acts as the ignitor from what im getting. Seems pretty easy to wire in. Im pretty dang good with electrical, but just trying to get a mental picture of how its gonna be wired in and operates lol.