[The Single Turbo Conversion Thread 2.0]

On 18/02/2009 at 3:07 AM, ReubenH said:

5.1 ECU.

The reason i said in the beginning, that this thread was for EJ20R legacy's only, is mainly because of this; the ECU wiring. You need only solder 4 wires, and you're done! Auto's have a single plug ECU that isn't compatible with any STi ECU, so you're buggered there. My official line on it is you should have got a bloody manual you pansy! Ha ha ;D (Just kidding, auto's are great.. i really mean it :) I am also unsure on the ECU's for the Manual EJ20H drivers... And BH/BE drivers. But what i have found out is the 4-plug EJ20H's are somewhat compatible with the 4Plug EJ20G's. I have posted a pinout for you guy's at the bottom of this thread. BE/BH drivers, V5/6 STi ECU's for the EJ208's, i have not seen pinouts for either, so up to you to research that one. But it has been done!

Anyway, the wiring for EJ20R drivers:

Wire A9 (loom) into A10 (ECU). Wire A22 and A23 (loom) into A9 (ECU). Ground B18 (ECU).

Swap A19 with A3 <- makes V3/4 ECU talk to the correct boost control solenoid.

And the not so technical drawing of the above description for us simple minded folk.

It's that easy.

If you compare the links below, you'll quickly find out V3's and 4's Just use a EJ20R loom! All the TT bits are blanks on the V3/4 ECU's.

here's some documents to back everything up

V3/4, Plug B137. Courtesy of http://www.northursalia.com/

V3/4, Plug B136 and B135. Courtesy of http://www.northursalia.com/

Twin turbo 3 plug pinout. Courtesy of UK Twin Turbo Legacy Register

5.2 Coil Pack Mod.

Hokay, quick addition to the conversion how too. I've been asked to do a write up on the coil pack mod, to rid ones self of the coil on plug system, and go to the sexy, cheap, and reliable coil pack system.

Eaaasssyyyy. You will need a Coil pack and leads off any Version 3 or 4 impreza, or N/A BG/BD. A matching 5 pin ignitor, and some additional wires and some actual loom stuff. Refer to the pictures to see what these look like!

For the wiring, I just spliced into the engine loom to get my power and ground, and 2 ignition signals. For the power, I think I just stole the 12v supply that goes to the coil packs, makes enough sense. And for the ground, there's a general ground wire you can tap into. Again, the pictures show which wires I used clearly. Then from there I just made a new branch off from the loom with some wires I had lying around, dedicated to the coil pack and ignitor. It's very strait forward! I think i'll let the pics and wiring diagram do the rest of the work for me.

for the ecu I have twin turbo wire loom and twin turbo ecu, if I’m putting single turbo ecu which wires need to be change please help thanks