I've been looking into r35 and r8 coils specifically since they are supposedly stronger than the factory system without a cdi and they just plain look cleaner. In ecmlink you can't adjust the spark dwell in any way that i know of so I was wondering if anyone has some knowledge on the factory dwell perimeters? More specially the time at 14 volts just to ballpark it.

Be aware that those are smart coils, they have built in dwell maps that can vary, they also are in no way plug and play with the Dsm engine management.

That's good to know, I appreciate your input. I'm just looking for a potential way around a cdi when it comes time, I'd rather not waste money on something that has been known to take a dump in a couple months.

3.5ms is quoted in this thread, and he has info on some of the other coil options.

Post #4

https://www.dsmtuners.com/threads/diy-cop-kit-with-denso-honda-coils.491594/

I don't know if 2g is the same as 1g but I'd bet they're similar.



These dwell times are huge compared to many modern coils. For example they're like double the denso coils I use, so I had to figure out some circuitry to compensate and make them usable with ecmlink, but I can tell you it's doable. I can't tell you if the system is better than stock because both stock and my system work for my use case, but my spark needs aren't very special with an 8.8:1 compression ratio, max 28psi boost, and only ~380whp. I only use it for weight savings, as well as simplicity (cleans up the engine bay and fewer pieces to worry about with no PTU in how I designed the system).

@TSiAWD666 did you also have a write-up on your coil setup? I've been fighting some ignition issues on my 90 laser, and was contemplating doing a COP, but didn't want to for the inherent issues without a cdi (and cost/issues with cdi boxes).

No, sorry I didn't and won't write my design up. I gave Spoolinup rights to produce it as the company sponsors me and provided the coils, wiring, and plate for me to test my theory. So if you want a non-300M COP that eliminates the PTU buying one from Spoolinup is an option.

If the ECU is a logic level output, you could just use a single Iogic-level inverter IC.

I actually did a similar thing on an old Subaru. I had installed a WRX ECU that expected 4 COPs, but I still had the 2x wasted spark NA coil. So I built an AND Showbox jiofi.local.html tplinklogin gate with diodes to fire the NA 2x coil when either of the appropriate COP outputs went high.

Worked great except when it got wet .

roukyweal20 said:

If the ECU is a logic level output, you could just use a single Iogic-level inverter IC.

I actually did a similar thing on an old Subaru. I had installed a WRX ECU that expected 4 COPs, but I still had the 2x wasted spark NA coil. So I built an AND gate with diodes to fire the NA 2x coil when either of the appropriate COP outputs went high.

Worked great except when it got wet .

Click to expand...

No, a set of logic inverters, or even some in combination with AND gates, is not enough for this. It's not a logic problem, it's a signal timing problem. Sure, there is propagation delay in logic circuits but not on the scale we're dealing with here without using an absurd amount of them.