Hi guys,Was hoping some further progress might have been made on honing dual ignitor 4G63 ignition. My Eclipse has been on stands for approaching a year and a half with the intent of upgrading the cat-back exhaust and trying to install a higher flow larger than OE SMIC. Unfortunately...

Please let us know what you actually implement and how it works out. I think this thread and its readers are best served by the accumulation of trials and results. I've no problem with you achieving better results than I, just let us know -- thanks !

Kind of disappointed by the complete lack of response ! To be honest, it's not clear whether it's better to go dual OE transistor module or hot wiring from the battery to the COP primary. (An Intrepid tech with professed plenty of time behind a scope said that 8 Amps should be enough, but this...

Quoting TrevorS: Replaced the cracked rear transistor pack connector and returned the ignition transistor pack ground to the harness. Still draws more current at idle than OE (guess not a huge surprise), but not as bad as before. Got to scope it to see where I'm at!My neighbor was kind...

Quoting TrevorS: Took the car for a run and then measured the COP module temps. Coil 120F, COP plate 140F, valve cover 170F, outside ambient 85F. Typical COP temp rating seems to be 120C (248F), so I think the COP margin should be fine. However, I notice the battery is discharging faster than...

Quoting TrevorS: I've moved coil power completely out of the OE harness and with the heavier shorter wiring, there ought to be greater spark energy, so my main concern is operating temps. The heat sink assembly is clearly keeping transistor temps well down, but I still have to verify the COP...

Quoting Broxma:To ride along with one of the things you mentioned in the last post, about the way the Intrepid coils each see battery voltage...One of the changes I am going to do to the setup I run on the Nissan is run the power wire off a relay. Since the positive wire at the harness is...

Quoting TrevorS: If I can get a scope on the coil battery line I should be able to learn more about load behavior.Installed my curent sampling resistance at the relay today and idled the engine while trying to take measurements (the mosquietoes loved it ).I tried two different...

Quoting JNR: Thanks for the update and keep us posted on long term reliability and all that...The main reliability question for me was whether there might be issues associated with doubling up the transistor packs -- either at the packs or COP modules. However, the successful long term...

Thanks for posting JNR, I've found the level of participation in this thread discouraging. In fact, my continuance of it is entirely out of respect for "CheekyChimp", "Curtis", and yourself. I surely hope you find it helpful.The only significant wiring change is that associated with COP Vs...

Received another J722T, sanded it, and tested it in the car -- it works and I've installed both into a revised heat sink assembly with heat sink compound.Installed the transistor pack assembly, reconnected the COP and battery, and fired it up -- caught instantly (as in instantly )! Took it...

Picked up some 14AWG yellow and red wire today with view to possibly upgrading the primary drive from the transistor packs to the coils including the #2 to #3 wire (downside being it blows the OE harness color coding ). Trouble is, I really don't know where I'm at, only that with a single...

Just checked with Rock Auto and I'm seeing over $100 apiece -- far too much for me. Will just have to see how things go.

Unfortunately, retail is consistently much more expensive than used ! Surely there are enough discarded '91 through '99 transistor packs out there that an experiment of this sort shouldn't require an arm and a leg ! I've seen posts on this very thread where posters were willing to provide...

For whatever reason, I'm having trouble coming up with a second good J722T power transistor pack. In the interim, I've taken the opportunity to build a new heat sink assembly that provides 17% more mounting surface and 71% more fin area. I figure it can only help. Also, I'm trying to learn...

Just an update! I've so far purchased three "J722T" transistor power packs via Ebay, and including the one I just received today (which turned out to be actually a J702T ), I've exactly one that does the job. Seems pretty clear it's going to be about a week before I can hope to have another...

Power Transistor pack arrived today -- had a much better quality sanding result this time. Earlier I used all of vertical (mounting hole-to-mounting hole), horizontal, and circular strokes of the pack against stationary sandpaper -- this time I used only vertical. So if you sand yours, I...

Guess it can be hard to visualize this stuff, but I would've been interested in what you came up with ! My concern over coil heat may be misplaced, but given I'm trying to ramp up the current by some 25%, seems to me like it's not out of order. I'm thinking this is one of those situations...

Quoting JNR: I didn't run my wiring in-between as I didn't like the heat part of it, but the coils themselves wasn't too worried about since they are on the top and pretty much designed to run right on the covers. Perhaps there could be some benefit to keeping them cooler I suppose and something...

Just ran across an interesting Wikipedia article on wasted spark.</font><blockquote><font class="small">Quoting Wikipedia:</font><hr /> The wasted spark system is an ignition system used with some four-stroke cycle internal combustion engines. In a wasted spark system, the spark plugs fire...

True, the laminates are on top, but a good hunk of the wire is actually underneath. On the Intrepid, it really is entirely on the top surface (that being the valve cover), the 4G63 top plates I've seen instead have cutouts of varying depth. Thinking of the wires, the OE design also sandwiches...

I'm thinking there normally is airflow over the engine from the radiator (except with vehicle stopped), end so if there's an opening along the plate, otherwise trapped heat (pretty much like in an oven) will probably escape at the rear and be replaced by cooler air from the front. With the...

Am considering installing grommets, perhaps with inner sleeves, in the COP plate mounting holes. Purpose being to allow a little air flow under the edges of the plate (otherwise ventilated only via the cable opening at the timing cover). Just thinking it would help with cooling the underside...

Well, that's fun, just did some troubleshooting and it turns out the rear transistor pack doesn't work. I ohm'd out the harness contacts and the problem is definitely the pack. So, it appears my impressions above are specific to a single transistor pack, not two in parallel. Does anybody by...

Wrapped the harnesses, put everything together, and fired it up. Started immediately (after I remembered to connect the battery ground ) and took if for a brief spin -- no problems.Frankly, my initial impression regarding performance, COP doesn't appear to buy anything -- it's either...

Quoting toybreaker:... please be sure to insulate that female terminal/connector where it plugs onto the condensor body well! A little heat shrink over the whole terminal will do the trick.Stopped by Home Depot for some heat shrink today (couldn't find my old ) and applied a little to...

Seems like the downside is the physically smaller the spark, the less uniform the combustion (resulting in more uncombusted gasses). A larger spark is likely to achieve better combustion, however, it's also more likely to be extinguished under high compression !

Quoting toybreaker: Please keep the thread updated with your progress!Just an update on wiring progress. I originally purchased a pre-wired COP assembly and have made modifications to that, plus I've finished the harness mods. However, I don't have the needed harness wrap tape yet, so...

Quoting TrevorS: it's been suggested I should proceed with leveling the heat dissipation surfaces of the transistor power packs. As I mentioned, I tried that manually with 600 grit and accomplished little. Do you by any chance know if this is practical? I can't afford to damage the packs...

To be fair -- from what I see with the Intrepid/300M plug conditions, we're talking resistor plugs and non-turbo. I just meant that the Intrepid/300M coils are capable of significant spark energy in their native environment.

Quoting belize1334: As for the igniters. I think it's just a matter of having the total impedance such that there is sufficient energy in the spark and not too long of a charge time. After that it's a matter of not overloading the power circuit, facilitated by running twin igniters with a...

Quoting JNR: Just wanted to second that the heatsink compound (paste) works really well and I was amazed on my CPU at home the difference a little bit of that stuff made on the processor to heatsink. I bought it at the local electronics supply house (not radio shack) and it was pretty $$ there...

Quoting toybreaker: Quoting TrevorS: it's been suggested I should proceed with leveling the heat dissipation surfaces of the transistor power packs.I would not recommend that.Those wiley engineers put that recessed area in there for a reason ... maybe to allow for expansion/contraction...

By the way, I'm a little uncertain whether to call you John or Jon. If Jon is correct, please accept my apology !

Just want to comment that I've had some positive responses and interesting inputs via PM and I'm appreciative. If I can be more fully responsive to questions (or perhaps just empathize ), please feel free to post accordingly. My purpose is only to build on what was already provided within the...

In case anyone's interested, here's the OE Intrepid and 300M 2.7L and 3.5L ignition capacitor, one of which mounts adjacent a COP module on each of the two cylinder heads.The printed rating is identical to the one in the OE coil-pack assembly (.47uF/250V), but the package is different...

Quoting toybreaker:The ignitors make some pretty substantial amounts of heat during operation, so while this might work ok for testing, I would try and mount the ignitors individually in the factory configuration with each of their backs against their own heat sink. Some heat...

Quoting toybreaker:Nothing is more satisfying than hearing a motor run for the first timeHoping to be there with my ignition mods pretty soon.

Yeah, time goes by ! As far as COP working, I read of lots of people saying otherwise. Of course, the most obvious reason is not having the wiring correct for the model year, but I also see people reporting misfire issues at both casual throttle and boost. Seems like the typical solution is...

Greets all ! I continue to thank Roger and Brox for their genuine contribution to the community. Unfortunately, it would appear the community has minimal interest ! Unless I see a significant turn around in interest in this forum, I'll be taking my further posts elsewhere. But to Roger and...

A very interesting article that was pointed out to me !click

Just a follow up, Mitsubishi consistently describes the transistor power pack as a power transistor. I'm aware of two fundamental power transistor technologies, field effect and bipolar. Given the earlier 6A measurement of .2V (9A at .5V), I'm suspecting these transistors are bipolar and the...

Ran across an interesting article dealing with coil wiring and direction of current flow. Seems to support the idea of the primary and secondary being isolated from the case and having a common terminal (though it could be either). It also points out that the coil functions as an AC...

It's not clear to me others are genuinely interested in this topic. Lack of interest would explain the unfortunate lack of participation. For myself, I'm always looking at further possibilities to modestly improve my Mitsubishi. Moving to COP seems an interesting possibility, 'course, in...

Quoting belize1334:If you say that you had issues with wiring one of the coils backwards then I SUSPECT that it was a wiring problem. Notice that the Intrepid coils on have three available terminals. For simplicity lets call them T1, T2 and SP. Normally you hook power to T1, ground to T2, and...

Just want to say thanks to Roger and Brox for the thought and effort they put into this. It's a shame that nobody else appears to have pursued it, but personally, I'm very interested (just found this thread today).I own a 1990 Eclipse GSX on which I've been making modest mods for about four...