Thread: CNP/COP conversion for OEM ECU

Ohhhhh Nevermind ... I don't know what the hell I was thinking... Actually I was thinking something compleatly different !!! Don't wake up then post right away.. lol

Actually.. I was reading about fuel timing and such at the same time... I am sitting here trying to figure out how the hell I could have posted somthing like this... It makes since but still... Just funny how the brain works some times.

So what makes since here is that your using the CAS direct as a RESET on Leading & Falling edges from the inner ring and the Post Processor output for the timing table??????????

The water restrictions must be making you delirious. Yes the CAS signals are at the heart of the design. I process the signal and output them in the correct sequence and timing based on the ECU ign. Its been a rather complicated process, but there is actually more than one way to do this. I've developed three ways so far. And a fourth is in the works. But yeah its a lot of signal processing and one of my biggest hurdles is noise. There is so much noise!

Have you tried using a twisted &/or shielded cable coming off the dizzy/CAS ?

I have not. I have a few more setups to try to see what works best though. The glitch i'm running into is either wiring related or pcb related. Hopefully its just wiring.

Here is the latest board. Ive been working a lot on making it as small as possible, and this is pretty much it. Its just under 2 square inches. But a glitch has me bound up at the moment and I am waiting on my new oscilloscope before I can go further.

Once this glitch is figured out I'll start on making a thorough video for everyone showcasing the DIS-SR.

Looks great! Hopefully you can get it worked out

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Are you printing your own boards? Or did you turn over the design for manufacturing ? Because it looks really nice...


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I am using a professional manufacturing company. I did all the design and building. They simply printed the board and silk-screened. I really like the purple they use too. To be honest, printing them myself was a hassle. Some good equipment is needed to pull it off well enough to work with. So while it was good to learn and fun to do, I'll likely have them print anything I need in the future.

nice tantalum capacitors!

I wonder if going solid state caps would lower emi/rfi

Probably, but I am not sure if it would make a difference. It doesn't operate at a frequency that should be affected by it. SHOULD. However, I eliminated the 12v power supply and will be picking up 5v from the ecu. If I am right the noise is coming from the power supply upon the collapse of the IGBT (it controls the primary coil). I think this is doing one of two things, causing noise in an overlapping trace (design flaw) or back feeding into the IC and causing a reset (decoupling should take care of this). Since this does not happen on the bench, its hard to replicate. So with this design I incorporated a ground plane to help limit the noise and eliminate power trace and signal trace overlap.

EDIT: Just to clarify, this does not mean the boards do not work. On bench testing they work fine, the prototype works fine installed. This is a PCB design issue that I am working out.