Ej20g engine, with ej22t wiring harness, and ej20g ECU??

[mexie-subie]

So i have been looking around and i have access to an ej20g ecu for cheap and i want to put it into my car to make my ej20g engine run a little better. i am just wondering what all do i need? i personally dont know much about wiring and everything, i do have basic electrical knowledge but nothing beyond that. have been reading and reading and i am wondering if i have all that i need:

Ej20g ECU 4 plug or 3 plug? i don't know.
Conversion harness (4-2)

i don't know much beyond that and i am not sure where to get the conversion harness.

if somebody could please help me out with this that would be greatly appreciated.

[mexie-subie]

i don't think i will need a tune because it is just a basically stock ej20g from a 94 wrx:
closed deck engine
intake
tmic
td04
TBE
pneumatic FCD (pushing 14 lbs)

[vrg3]

You have a North American Legacy turbo with an EJ20G engine swapped into it? This should be easy. I'm pretty sure all EJ20G ECUs were 4-plug. You'll just have to do some wiring for the ignition, because the EJ22T ECU has 2 ignition channels but the EJ20G has 4. Other board members have written about the process of adding the wires to the harness and adding the ignition components needed.

[prodrive]

You have a North American Legacy turbo with an EJ20G engine swapped into it? This should be easy. I'm pretty sure all EJ20G ECUs were 4-plug. You'll just have to do some wiring for the ignition, because the EJ22T ECU has 2 ignition channels but the EJ20G has 4. Other board members have written about the process of adding the wires to the harness and adding the ignition components needed.

any links?

[vrg3]

http://surrealmirage.com/vrg3/ecupins/
http://www.main.experiencetherave.com/s ... ual_scans/
http://bbs.legacycentral.org/viewtopic.php?t=37071
http://bbs.legacycentral.org/viewtopic.php?t=43959
http://bbs.legacycentral.org/viewtopic.php?t=35093

[Turboturd]

Only the v1, v2 Wrx and early legacy rs ecu's are four plug. Everything that point generally is the 3 plug. There's a couple little wiring differences with an ej22t harness, but those things have been covered.

[mexie-subie]

ok, so i came across a ej20t 4 plug ECU, now my questions is, before i spend money on it, if i know it was from an ej20t engine, and it is 4 plug, am i guaranteed that it will work? (of course if it isn't broken itself) and also would there need to have any MAF changes? i was reading on kimo's thread that he had problems with the MAF system. thanks guys for all your help! i will be purchasing this ecu and swapping it in w/out any robtune, and i just want everything to go smoothly ya know? thanks!

[mexie-subie]

i am heading down today to pick up the 20g ecu i just wanted to make sure.. or if somebody could answer the questions on the post above thanks.

[kimokalihi]

You'll want the JECS maf if you're running rob's tune. If not, I'm not sure.

[rob]

ok, so i came across a ej20t 4 plug ECU, now my questions is, before i spend money on it, if i know it was from an ej20t engine, and it is 4 plug, am i guaranteed that it will work? (of course if it isn't broken itself) and also would there need to have any MAF changes? i was reading on kimo's thread that he had problems with the MAF system. thanks guys for all your help! i will be purchasing this ecu and swapping it in w/out any robtune, and i just want everything to go smoothly ya know? thanks!

It needs to be an EJ20G ECU from one of the WRX variants (not a liberty/legacy or later Forester). If you can get the 2 digit ECU code I can confirm.

-Rob

[mexie-subie]

ok thanks rob, i will PM you the code to verify thanks!