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Re: Coil On Plug Conversion for Stock ECU

Posted: Wed Jan 13, 2021 8:53 pm
by p00t
Looks good, thanks for posting a picture of the setup! That jacket on the COP harness looks really durable.

Also I think you beat me to the 3D printed dizzy cap!

Mines waiting to go on:
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Re: Coil On Plug Conversion for Stock ECU

Posted: Thu Jan 14, 2021 10:18 am
by mfschoenberg6522
Yes, Wiring Specialties makes a very good product. Highly recommend them for harnesses & connectors on Nissan's.

I found another source for dust covers on ebay for slightly less than Xcessive with free shipping from the Midwest. These seem to be rapid prototpye style material, with a fairly high heat capability. Actually, I had a exhaust gasket leak on my CXRacing tubular header that melted my distributor and caused alot of problems (left me stranded). So I'm happy to get rid of the distributor & spark plug wires.

For whatever reason, the CXRacing tubular headers placed my turbo compressor very close to the dizzy, I had to rebuild the center section last year as a replacement T3/T4 from CXRacing didn't fit (Designed for S13 w/ shorter dizzy w/o internal coil). So that opens me up to a new turbo as well and is
on my 'to do' list.

I had my eye on a Nice Time Racing valve cover adapter w/o hardware for a Honda K coil, but these are $275. I used 2 part epoxy & M6 x 1 tapped bosses. This may be a temporary solution for now. Maybe a reason others could use LS coils. I still have a ROM tune S13 ECU, looking at a Nismotronic solution or possibly stand alone in the distant future now that I have a COP solution. I had looked into the SR20 ECU w/ adapter harness, but decided to go a different direction.

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Feb 05, 2021 12:08 pm
by BoostedB
Hey p00t! Joined just to solicit a message from you. I'd like to get ahold of one of these!

Re: Coil On Plug Conversion for Stock ECU

Posted: Sat Feb 20, 2021 1:41 pm
by Alonso
Wow I haven't been keeping an eye on the forums close enough! How much are these COP converters going for?

Re: Coil On Plug Conversion for Stock ECU

Posted: Wed Feb 24, 2021 3:55 pm
by p00t
Hey Alonso. I am selling them for $125 + shipping. Going to have to make more it seems!

You can thank Matt (mfshoenberg) for reviving this thread... and also special thanks to the bots for not having spammed this thread yet. I am a little jealous "ingoodpoo8" chose a different thread to comment in!

I was looking at the Maxima coils and it looked like three of them could use the existing valve cover bolt holes to hold them down. Maybe use a stud or a longer bolt with a spacer? I am not sure what options are out there for adapting them to the KA but if anyone has info we should update the Maxima coils thread.

Here's how the 01 Max coils fit FYI:
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Re: Coil On Plug Conversion for Stock ECU

Posted: Tue Mar 16, 2021 1:23 pm
by airman
Awesome seeing you legends still around. I hope with the new phpBB update and recaptcha v3 we will not see much spam.

Re: Coil On Plug Conversion for Stock ECU

Posted: Tue Mar 16, 2021 2:29 pm
by Alonso
I'd be willing to hang around more but every browser I use warns me that the connection to this site is not secure. What can one do about that, if possible?

Re: Coil On Plug Conversion for Stock ECU

Posted: Wed Mar 17, 2021 3:32 am
by airman
Ahh! Thanks for pointing that out - SSL certificate is renewed and https is now enabled.

Re: Coil On Plug Conversion for Stock ECU

Posted: Wed Mar 17, 2021 10:20 am
by Alonso
So after reading the manual, this unit would NOT be compatible with a stock ecu running nismotronic with spark cut limiter enabled?

Re: Coil On Plug Conversion for Stock ECU

Posted: Mon Mar 22, 2021 3:45 pm
by p00t
As it is coded now no it always expects a spark because the nissan ecu normally always sends one.

I have an idea of how to remedy that but I don't have an ecu with that feature to test and debug on.

Re: Coil On Plug Conversion for Stock ECU

Posted: Mon Sep 06, 2021 8:45 am
by ShinyWisenheimer
p00t are you still making these? Also, just out of curiosity, what’s the r&d been like? How many people are running these? Any issues? Not a whole lot of options out there for stock ecu coil on plug conversions.
I dropped a DE into a ‘73 Datsun 620 and decided to go with an auto trans so my options for stand alone ecu’s are basically zero 🤦🏻‍♂️

Re: Coil On Plug Conversion for Stock ECU

Posted: Tue Sep 07, 2021 7:16 pm
by p00t
I can make them. I need to order the PCB boards. I sold all the ones I had. I guess I should just order them so people don't have to wait.

They ran in two of my cars for years. Still in my 240 and running great.

One person has posted his car running on max coils but that's the limit of outside feedback. I would't be offering them here if they didn't work :) I was learning stuff with microcontrollers on this project so there is more time in it than would ever make sense under normal circumstances. Surely a sane person would just get a standalone instead of working on something for a few years and keep his stock ecu with a 60 dollar daughterboard :confusion-seeingstars:

Re: Coil On Plug Conversion for Stock ECU

Posted: Wed Sep 29, 2021 2:05 pm
by ShinyWisenheimer
If you’ve got plans to make more definitely put me down for one :handgestures-thumbupleft:

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Oct 01, 2021 2:04 pm
by p00t
Yep just got 5 pcb boards in and will work on them soon!

Re: Coil On Plug Conversion for Stock ECU

Posted: Sun Oct 03, 2021 4:42 pm
by ShinyWisenheimer
What is required to have this setup work for different smart coils? Say I wanted to get the wiring specialties coil kit with the Honda K series coils and harness would they work? Or is it specific to LS or Maxima coils?

Re: Coil On Plug Conversion for Stock ECU

Posted: Sun Oct 03, 2021 6:51 pm
by p00t
It's just automatically mapped for LS and maxima coils so you just set it and go. You can run the K series coils with the fixed dwell setting since there is very little dwell change with voltage on those from what I see. You will be okay setting them to 3ms from what I see here: https://support.haltech.com/portal/en/k ... /thomas-te

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Nov 19, 2021 10:42 am
by mfschoenberg6522
Running a KA24DET with Maxima coils. Ended up getting a NiceTime Racing S14 timing cover bracket, designed for Honda K series coils, but fits the Maxima smart coils. This was not cheap. I have been offline for a while, the rings on #4 cylinder went out and now have a rebuilt engine. System provided plenty of spark on 'old' engine that was low on compression and had blow-by issues.

Eliminating the distributor provided more clearance a different CX Racing top mount turbo as well with new engine. Have to post pics soon. Always wanted COP like the SR20DET engines.

Re: Coil On Plug Conversion for Stock ECU

Posted: Sun Mar 06, 2022 3:56 pm
by ShinyWisenheimer
Time to revive this bad boy! Finished up all the wiring I was doing, installed the CoP setup, and fired her up! Runs pretty ok. Need to set the idle and timing and stuff but the CoP setup works great.
One thing I’m getting is a code for 21 which is ignition related. I’m also getting 34 which is knock sensor but I don’t believe that’s related.
So my question is since I’ve essentially taken away control of the ignition signal from the ECU is the 21 code normal? Or is it looking for something else?
I tee’d in to TDC & CAS signal and ran the IG sig direct from the ecu. In the process I removed all the other wiring for the ignition coil, igniter, etc
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Re: Coil On Plug Conversion for Stock ECU

Posted: Mon Mar 07, 2022 12:13 pm
by ShinyWisenheimer
After doing some thinking and a little research I’m thinking my timing may be too advanced. The box is set at 15° and to smooth out the idle I have the dist all the way advanced. I didn’t put a light on it, just did it by ear. I may drop the box to 10° and set the timing properly and see where that gets me.
To set the timing should I be able to just clamp on the #1 signal wire like you would with a spark plug wire or is there a different method with the coil packs?

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Mar 18, 2022 3:39 pm
by ShinyWisenheimer
Sorted out the code 34 problem, had my wires crossed for the knock sensor (oops). Still working on the 21

Also to set timing I was able to just put the clamp around the signal wire going to #1, if anyone is curious.

Re: Coil On Plug Conversion for Stock ECU

Posted: Sun Mar 20, 2022 4:31 pm
by ShinyWisenheimer
Does anyone know what type of signal pin 3 on the ecu is looking for. The input comes from the coil, feeds the collector of the power transistor, and through a 2.2k resistor. I tried to fake it with a 12v signal from the ignition but I’m still getting the 21. Not sure if it’s supposed to be pulsed or what.
Truck fires up every time & the timing is set properly.

Re: Coil On Plug Conversion for Stock ECU

Posted: Thu Mar 24, 2022 2:00 pm
by mfschoenberg6522
Been a while. I have a rebuilt engine in and bolted up to my bell housing w/ a new 'white bunny' clutch upgrade. I think there is typically a loop on #1 if you buy a harness from wiring specialties like I did for S15 smart coils (using maxima).

I'm actually running an SR20DET ECU now w/ daughter board on my S14. I made an adapter harness similar to other threads on this forum for pinouts. Running SR20DET CAS wheel. May eventually go Nistronic system once things are back up and running.

Seems like there could be an ignition check signal that the ECU may be looking for if it is throwing codes. I had originally bought an XCessive external coil kit before I went COP system. s14 dizzy is different than an S13. I remember seeing documentation out there and maybe earlier in this thread?

Re: Coil On Plug Conversion for Stock ECU

Posted: Thu Mar 24, 2022 2:26 pm
by mfschoenberg6522
Not sure if this helps, but I was thinking about a couple of documents on JWT site about how the power transistor signal works:

http://jimwolftechnology.com/wolfpdf/MS ... 0240SX.PDF

http://jimwolftechnology.com/wolfpdf/DI ... SISTER.PDF

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Mar 25, 2022 11:07 am
by tuzzio
For those wondering, precision speed LLC makes billet K-series coil brackets and matching billet distributor covers.

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Mar 25, 2022 11:59 am
by mfschoenberg6522
@ tuzzio. Thanks, I was on the fence about the $129 Nice Time racing aluminum cover to replace the plastic rapid prototype style plastic part I had. I haven't been on the forum in a long time and I remember seeing that Nice Time (via instagram) had partnered with Wiring Specialties for the Honda K coil kit. I still like the heft of the NGK maxima coils compared to a used ebay honda coils I used for fitup and using all Nissan style connectors, etc.

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Mar 25, 2022 4:25 pm
by p00t
Shiny the install looks real clean!

The ECU will throw a code for ignition coil but it should not cause the light to be on. You are just seeing the code when you scan right? You are correct that it no longer sees the single coil go negative.

For timing the ECU has to go into timing mode to lock in 20°(warmup, pull TPS, rev 3 times, cross fingers...). It is kind of hit or miss so that is why there is a timing function on the converter. Normal idling the timing will go everywhere.

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Mar 25, 2022 5:12 pm
by ShinyWisenheimer
p00t wrote: Fri Mar 25, 2022 4:25 pm Shiny the install looks real clean!

The ECU will throw a code for ignition coil but it should not cause the light to be on. You are just seeing the code when you scan right? You are correct that it no longer sees the single coil go negative.

For timing the ECU has to go into timing mode to lock in 20°(warmup, pull TPS, rev 3 times, cross fingers...). It is kind of hit or miss so that is why there is a timing function on the converter. Normal idling the timing will go everywhere.
Thanks p00t. Yeah it’s just the scan code, no CEL. As long as it doesn’t affect how the engine runs or whatever I won’t worry about it.

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Mar 25, 2022 5:32 pm
by p00t
Good to hear. I was thinking it was setting the light after reading your post. It does not affect anything. It must have the most basic logic case to set that code... How would an engine run without the coil operating (besides a COP conversion)?

When I was a Nissan mechanic (for a brief moment in history) the older SR20 Sentras would frequently have that code hiding in the ECU even on perfectly running cars.

Also I don't think it is worth the effort but if you are really trying to get rid of that code it wants to see an inverted signal from the coil. So you would need a 12v inverting circuit that sends the opposite of the ignition signal.

Re: Coil On Plug Conversion for Stock ECU

Posted: Fri Mar 25, 2022 5:36 pm
by ShinyWisenheimer
mfschoenberg6522 wrote: Fri Mar 25, 2022 11:59 am @ tuzzio. Thanks, I was on the fence about the $129 Nice Time racing aluminum cover to replace the plastic rapid prototype style plastic part I had. I haven't been on the forum in a long time and I remember seeing that Nice Time (via instagram) had partnered with Wiring Specialties for the Honda K coil kit. I still like the heft of the NGK maxima coils compared to a used ebay honda coils I used for fitup and using all Nissan style connectors, etc.
That’s the kit I have. Really well made but definitely not easy on the wallet.

Re: Coil On Plug Conversion for Stock ECU

Posted: Tue Mar 29, 2022 8:26 am
by mfschoenberg6522
new_motor_29MAR22_cop.jpg
The NTR bracket is well built, but didn't know about other options at the time. There was some flexibility in terms of using different coil pack spacers. The better option seems to be PrecisionSpeedllc.bigcartel.com. I have a billet cover on order as it is a single piece with no welding. The Radium Engineering valve cover swivel adapter was another quality item that I had to have for the KA. I like the COP system and a CNP would have required a bracket as well including high quality Magnecor wires, but to each his own. Once I get my car up and running, I will start looking again into a Nismotronic board for real time tuning and integration of my AEM air fuel meter, boost controller solenoid, etc.