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#1
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99-00 GC8 Coil pack to GD Coil on Plug Conversion
After another failed attempt to get my car to behave on the dyno today, I'm in the process of setting up a waste spark coil on plug ignition system on my car using GD coils.
There's a couple of things to be aware of..... The 99-00 wiring harness has the following colours at the coil pack plug (engine harness side): Black= 12v+ Red/yellow trace = cyl 1 & 2 trigger Blue = Cyl 3 & 4 trigger Blue / black trace = Coil ground Interfacing to the Oem coil pack pig tail (cut off the old coil pack itself) the resultant wiring is: Black.......... -=becomes=-........Red/ Yellow = 12v+ to coils Red/yellow....-=becomes=-........Yellow = cyl 1 & 2 trigger Blue.............-==STAYS!==-......Blue = cyl 3 & 4 trigger blue/ black....-=becomes=-........black = coil earth So.... seeing as GC8's only have 2 ignition channels & I need to fire 4 coils (wasted spark)...We need to make up a harness. To fire the coils in pairs I made up two 'Y' harnesses to fire opposing coils (1 & 2 off the yellow wire, 3 & 4 off the blue), in pairs . Notes: Coil Power: All four coils are fed 12v+ from the red/yellow wire (which is powered off the fuel pump relay). Coil Primary Earthing:You can earth the coils individually through their mounting bolt (not a necessity - if using the factory harness). I used 5 core shielded wire to make the coil harnesses.....Be sure to use cable thick enough to prevent voltage drop at the coils. I've taken some pic's & I'll post them up once I have everything tidied up under the bonnet. Thanks to Prototype Rob for the GD coils & coil sub harnesses. This mod fixed all of my ignition issues - I'm currently (June, 2015) running E85 @ 1.6 bar on a TD05/20G on standard plug gaps with zero issues.
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[CENTER][SIGPIC][/SIGPIC][/CENTER] [CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER] Last edited by Rossco; 08-08-2015 at 01:25 PM. |
#2
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Awesome details.
Can't wait to get it on the dyno again. |
#3
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geeeeees Rossco you putting ideas in my head ,it looks nice and straight forward when you explain it like that.
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#4
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Wow awesome job Rossco. Can you please explain why there is no miss now with coil on plug? Is there more current to the plugs now?
Adi |
#5
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Nice work Ross. Worthwhile upgrade. Good luck on the dyno!
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www.racewars.com.au |
#6
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Awesome to hear Ross!
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I am only an asshole on the internet :) [SIGPIC][/SIGPIC] |
#7
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Quote:
Coil on plug eliminates another failure point (the leads themselves).
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[CENTER][SIGPIC][/SIGPIC][/CENTER] [CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER] |
#8
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total cost? want to do mine? lol
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[I]Personal chef[/I] |
#9
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Materials:
Coils (Off Proto-Rob) $200 2 x 6 way Narva plugs & terminals $15 2 m 5 core shielded cable $12 Total win of $227 I'm happy to guide you through yours Tris...... I just hate crimping & soldering 38 times - it does my head in... Ha ha!
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[CENTER][SIGPIC][/SIGPIC][/CENTER] [CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER] |
#10
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Worthwhile upgrade indeed!
Does it matter which coil on plugs or are they all the same type from JDM to ADM/Liberty to Impreza ?
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MY00 GT Forester with STi goodies |
Tags |
9900, coil, conversion, cop, gc8, gd, on plug, pack, plug |
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LinkBack to this Thread: http://www.perth-wrx.com/vb/mechanicals/42930-99-00-gc8-coil-pack-gd-coil-plug-conversion.html
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