Recently I've been having some issues with my Bushur C.O.P. system. The car would run fine for a while and then shut off completely. Subsequent diagnosis determined that the CDI box was not providing spark. After it sat for a little while, it would then fire up and run normal. This problem was intermittent. I did contact Nick@BuschurRacing and he told me to send the unit back, so he could ship it to M&W for repair. I held off in sending the unit and started to investigate whats out there!, since there appears to be more options available for COP ignition.

I ended up getting my hands on another brand system and in comparing the two systems there's some important differences that I've found that I thought I'd share.

I noticed that in my system, there was only one ground wire was connected to box. The other system had two grounds going into the CDI.
The wiring on my system was not twisted like the other.

I downloaded the M&W instruction manual which includes the wiring diagram to the CDI box. I read in the instructions that the wires to the coils should be twisted to minimize electrical interference.
I was a little confused, when I found that the ground wire was supposed to be connected to the box at pins #7&8. On my system, it's only connected to pin #7. In reading the instructions, I also learnt about the two available power modes, HIGH POWER & MULTI-SPARK. For my application, high power seems to be more suited. But my system was in multi-spark.

My last record of 9.21 @ 153 with 75shot could have possibly been better had it been in High Power Mode? Are the other drag Evos out there running in Multi-Spark? Or am I the only one with a system wired like this making this power? I've spent a lot of money over the years trying to go fast with various vendors and Bushur's parts have always worked well. I am only discussing what I found due to my recent ignition problem.

PS I am not trying to bash anyone , I just want to share this important info

see it your self





Hummm?

 

Im running Buschur COP w/o any issue to date..

BTW.. factory cars dont have the wires twisted and they dont have a problem.. interesting..

 

My question is are the other drag Evos out there running in Multi-Spark?
do you know if your set up is in multi-spark or in HIGH POWER ?
I just want to share this info because it is a fact !

 

Factory car are not high voltage like the signal form the CDI box is. So the wiring separation and setup is more critical.

 

The wires being twisted won't make much difference, as long as you don't have them run next to any important wires. Even then, I wouldn't worry TOO much. I may be mistaken, but I believe there may be an Australian law regarding this. I think the M&W instructions even refer to this.

The multispark would make the box run warmer than a single spark, because it is putting out the same amount of power per spark, and just increasing heat generated in the box. What you are describing(runs for a while, shuts off, then will restart after a bit) sounds like a heat related failure in the box. Shutting off multispark would probably make it work more consistently. Putting the high power back on might bring the problem back.

 

Interesting. I am wondering if the wire wisting is for noise suppression, as it is done with "twisted pair" wiring (telephone, Ethernet)

I see a 2.5 meter length restriction in the instructions... sounds like plenty to get it inside the car... I do like that feature.

 

looks like craig from sparktech ''ebay c.o.p.'' did not copy davids c.o.p. system after all. clearly they are to different units from wiring to many options. seems like the one that was wired wrong was b/r unit. guess some people dont know what there looking at.

post 12
https://www.evolutionm.net/forums/sh...d.php?t=276104

 

The reason why one would, Sparktech in this case, twist the wires is because it is both what M & W says to do and also to help cancel out the electrical frequency coming directly from the CDI. It is a way to prevent any interference with the ECU and/or injector pulse, for example. Will twisting these wires prevent any interference on our particular application?? I'm not sure, but I'm glad to know it's done to M & W specifications.
The Sparktech COP really surprised me aesthetically. I don't think Craig could do a better job with all the wiring, harnesses, and the etched plate that he uses for the coil packs. Craig will also set your CDI to either high output or multi-spark mode before he sends it out. Otherwise he will instruct you on how to switch modes quite easily.

 

I would like to know why Buschurs was set up that way also, but its prolly some "secret" so I doubt hell post it publicly.

 

Well a quick test to see if the extra ground wire matters would be to check the resistance between pins 7 and 8 on the plug on the M&W unit. If it is very low resistance(around 0 ohms), then it probably means they are tied together in the box.

I'd bet M&W have 2 12V wires, and 2 ground wires, to handle the current capacity. So they tie the 2 wires together inside the box. Using just a single wire for each will probably still work just fine. But it might be outside the spec of the wire, connector, or something else. Many connectors like that have a rating of only a few amps per terminal. Most other CDIs feed power and ground into the box through a much larger wire, so they don't have to deal with this.


Also, xiaoni420, the Sparktech still isn't following the M&W specification precisely, just much closer than Buschur. On the sparktech harness pictured, there doesn't appear to be the grounded shield to the cables. Not that it will make a difference, but then again, I doubt the twisted cabling makes a difference in how the system performs either.

 

I could be totally wrong but i would think that you would need in in Multi Spark Mode to work with the stock ECU.

Either way though most of you guys are using the Pro 12 CDI box which is only a 2 channel box anyways. It would be smart to move to the Pro 14 CDI box to have 4 channels for true individual coils but hey what do i know?

Chris

 

I just spoke with my brother, Daniel, so I can address the questions of the first post.

First off, the secondary ground is not needed, that is direct from our distributor AND M&W. The coiling of the wiring is also NOT needed unless you have some type of electrical interference, which has NEVER been an issue, this is also per our distributor AND M&W direct.

Also, every single CDI/COP we ship from here is set up with multi spark. At low speed cruise/idle the multi spark runs better. Obviously it works well at high boost/rpm too, even your beautifully built, heavy pizza delivery EVO ran 9.21 on NOS. We wanted to make sure the pepperoni's stayed on the pies and to do this we set it up on multi spark so the car would run so smooth.

The Pro 14 has 4 inputs, the stock ECU has 2 outputs, so we use the Pro 12 box because it can be used with the AEM, stock ECU or any other EVO fuel management.

 

Our systems have 2 grounds and will continue to do so as per M & W instructions/diagrams. Extra precautions like twisted paired wiring is used for noise cancellation and neatness.
We've found that HIGH POWER MODE to be best suited for over 900whp. We wire these per customer application no one size fits all. Multi-spark works great with stock ecu and daily driven applications. Our systems are 100 % plug and play

 

I have cleaned this thread up a bit until to remove some of the hostility and what appear to be odd agenda pushing

 

Please do not turn this into a vendor war. If this erupts, both will be facing consequences. We have two products that both seem to work and both have proof that they work. Question was answered to the best it will be, so I am locking it before it turns into a mess