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3rd Gear Chirper
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Discussion Starter · #1 ·
Hello all, I've searched here and on MD for info on the COP conversion and there are differing opinions on whether the coils should be wired in series or parallel.

According to my search results, it's okay to wire in series if you aren't making much more power than stock, but if so then the spark is too weak.

Parallel wiring will not provide enough power to fire the engine during cranking unless a MSD box is used...

So what should I do? I plan on installing a PI motor with the usual bolt-ons and possibly cam and valve upgrades for higher RPM use. It won't be seeing boost for a while. Will the series wiring still provide enough juice, or should I wire parallel and get the DIS 4 box?

Thanx!
 

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I have them wired in series, and have no problems at all. I talked with Guitar Maestro quite a bit and he has been running them in series for quite a while now with no problems.

Scott
 

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i've seen a lot of arguments, but no solid data to back it up.....i for one dont know how much HP a series arrangement will "support"......what i do know, is that im running ~10.5:1 compression via PI heads on NPI shortblock, Crower cams, PI intake, and all that good stoff in my sig, and using 0.062" spark plug gap, and have absolutely no spark blow out issues anywhere in the rpm operating range (currently shifting @ 6100-6200).....so i doubt that my spark is "weak" lol

one guy on MD says he has done several parallel installs with no problems....another says that a DIS 4 box is needed.......someone has to be wrong......but i doubt either one can disprove the other in any way


the only possible problem with parallel wiring is that it will present one-fourth the resistance to the EDIS (whether internal to the EEC or external like in the 94/95s) compared to running stock coil packs or series-wiring of COPs.......there are very few people who would know the actual electrical current limitations of the EDIS system, and the only ones who would, most likely work for SCT

i plan to get a SCT PRP soon and try out the parallel wiring....i have a spare EEC-V, so if i should happen to fry mine at any time, i can flash my spare and go back to series wiring......until then, its up to you to decide what you wanna do.......all i can do, is say that i dont know exactly how much HP i got, but im sure i got "a little" more than stock and have no problems and my car runs like a champ
 

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3rd Gear Chirper
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2,399 Posts
Discussion Starter · #4 ·
Well, I'll wire them in series then so that there's no chance of burning up my EEC. I'm going to run the new wiring in the existing harness, then recover it with fresh materials (plastic tubing and tape) so it looks good.
 

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I wired mine in series and had some issues, but I think they may have been caused by "leaky" boots... The car started hard (much more cranking than normal), once it started, seemed to idle ok, but had a miss under load... I have gone back to the coil packs for now until I can get newer boots and/or coils.
 
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