Whiterabbitrexy Posted September 10, 2022 Report Share Posted September 10, 2022 Hi everyone i have a 1998 wrx GF8 ej20 Manuel and the factory ecu has wasted spark.....my new g4x plug and play ecu has the option to change in the software from what i know...but how will i go about to change this ? i want to use Toyota prius coils because the 2jz guys use this for there 1000hp engine builds. Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 10, 2022 Report Share Posted September 10, 2022 Do you have a WRX6X ecu? Or the V3/4? Quote Link to comment Share on other sites More sharing options...
mero Posted September 11, 2022 Report Share Posted September 11, 2022 Following as I'd also like to convert to direct spark COP. V5-6G4X PnP ecu. Quote Link to comment Share on other sites More sharing options...
Whiterabbitrexy Posted September 11, 2022 Author Report Share Posted September 11, 2022 20 hours ago, Adamw said: Do you have a WRX6X ecu? Or the V3/4? crap sorry my bad i cant belive i didnt put that in my first post.....Yes it is a V3/4 part number 227-4000 Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 11, 2022 Report Share Posted September 11, 2022 On this ecu the Ign 3 &4 drives are used for 2 radiator fans originally (Pin 31&39). So what I would do is get an expansion loom, this has Ign 7 &8 drives on it, you can snip the fan wires off Ign 3 &4 and connect to Ign 7 & 8 instead. Then run two new wires from pin 31 & 39 to the new coils on Cyl 3 & 4. Coils for Cyl 1 & 2 will be connected to Ign 1 &2 that are going to the original wasted spark coil. Quote Link to comment Share on other sites More sharing options...
Hurtenstein Posted August 20, 2023 Report Share Posted August 20, 2023 I'm about to undertake this also. PNP V5/6. Do I have to mess around swapping the factory wiring, or can I just get the ECU to fire 1,2,7,8? (7/8 being the expansion loom). Ign 3 is currently a factory thermo output and Ign 4 was a second fan, but been changed to a second, staged, fuel pump. Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 20, 2023 Report Share Posted August 20, 2023 You need to use Ign 1-4. Quote Link to comment Share on other sites More sharing options...
Hurtenstein Posted August 20, 2023 Report Share Posted August 20, 2023 Yeah ok, spew. Just out of curiosity, which outputs are Ign 5/6? The pinout doesn't say, just 7/8 in the expansion loom. Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 20, 2023 Report Share Posted August 20, 2023 There are no pins for Ign 5 & 6 on that ecu. Quote Link to comment Share on other sites More sharing options...
Hurtenstein Posted November 15, 2023 Report Share Posted November 15, 2023 Just found this brilliant table for anyone else looking to convert to COP on a GC8 (or others). Saves having to chop up or De-pin your connectors when using the expansion loom. dx4picco 1 Quote Link to comment Share on other sites More sharing options...
koracing Posted November 16, 2023 Report Share Posted November 16, 2023 This is only new with the most recent software released in September. Quote Link to comment Share on other sites More sharing options...
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