I have been trying to find out more info on stock and STI ecus for the GC8s and what the diffrences and specs are..

Im hoping this might help others.. also would love to fill in more of the blanks with stock ECUs like the 8S and 6S.. Which i think are missing.. All this info was found on the net.. from lots of diffrent places...

U8, 2C - 1993/1994 WRX – TDO5-11.47PSI (0.8BAR) TO REDLINE -FUELCUT 14.5PSI (1BAR) - 240PS (237BHP)
W6 - 1993 WRX RA – TDO5- 11.47PSI (0.8BAR) -FUELCUT 14.5PSI (1BAR) - 240PS (237BHP)
W9 - 1994 WRX RA - 11.47PSI (0.8BAR) -FUELCUT 14.5PSI (1BAR) - 240PS (237BHP)
SA (STI CHIPPED) - VER1 STI (SEDAN AND WAGON)- 14.94PSI
SB (STI CHIPPED) - VER1 STI-RA - 13.64PSI
SC (STI CHIPPED) – SAME AS Z4 - VER2 STI WAGON - -12.7PSI (0.9BAR), DROPPING TO 11.7PSI (0.8BAR) @ 6600RPM
FUEL CUT 15.65PSI (1.08BAR)-260PS (256BHP) - 7250RPM
Z4 - 1995/1996 WRX – SAME AS SC- 12.7PSI (0.9BAR), DROPPING TO 11.7PSI (0.8BAR) @ 6600RPM
- FUEL CUT 15.65PSI (1.08BAR) - 260PS (256 BHP) – 7250RPM
Z5 - 1995/1996 WRX-RA - 12.57PSI
6K - VER2 STI SEDAN – SAME AS PRODRIVE-TDO5- 13.33PSI (0.92BAR) BUT PEAKS TO 13.6PSI (0.94BAR) @ 5600RPM, THEN DROPS TO 12.71PSI (0.87BAR) @ 6600RPM- FUEL CUT 15.65PSI (1.07BAR)-7500RPM-380CC
7K - VER2 STI-RA - 13.17PSI(0.9BAR) BUT PEAKS TO 13.64PSI (0.94BAR) @ 5800RPM- FUEL CUT 15.96PSI (1.1BAR)-

PRODRIVE UK ECU (PRODRIVE CHIPPED) – SAME AS 6K – 13.33PSI (0.92BAR) BUT PEAKS TO 13.6PSI (0.94BAR) @ 5600RPM, THEN DROPS TO 12.71PSI (0.87BAR) @ 6600RPM- FUEL CUT 15.65PSI (1.07BAR)-7500RPM-380CC

1C, 3B, V9, V5 , V9, 4B, ALL(?TBC) WRX WAGONS - 10.55PSI (0.7BAR) DROPPING TO 6.84PSI (0.5BAR) STARTS TO DROP @ 5000RPM – FUEL CUT 13.79PSI (0.95BAR) -

V7, 7D, 6D - 1993 TO 1996 UK/EURO - 11.4PSI (0.8BAR), DROPPING TO 9.4PSI (0.65BAR) @ 6600RPM – BOOST CUT 14.87PSI (1BAR)-

Classic import (saloon)- 92- 94
2C ECU code = 380cc injectors, 240ps TD05H turbo
W6 ECU code = 380cc injectors, 240ps TD05H turbo
U8 ECU code = 380cc injectors, 240ps TD05H turbo
SA ECU code = 380cc injectors 250ps TD05H turbo
SB ECU code = 380cc injectors 250ps TD05H turbo
Classic import- (saloon) 95-96
Z4 ECU code = 380cc injectors, 260ps TD05H turbo
Z5 ECU code = 380cc injectors, 260ps TD05H turbo
6K ECU code = 380cc injectors. 275ps TD05H turbo
7k ECU code = 380cc injectors, 275ps TD05H turbo
Classic import- (saloon) 97-98
IS ECU code = 440cc injectors, 280ps VF22 turbo
6S ECU code = 440cc injectors, 300ps VF23 turbo
75 ECU code = 440cc injectors, 280ps VF24 turbo
Classic import- (saloon) 99-00
A8 ECU code = 440cc injectors, 280ps VF22
A7 ECU code = 440cc injectors, 280ps VF22
J2 ECU code = 440cc injectors, 280ps VF28/VF29

NB all at stock fuel rail pressure of 43.5psi too)
Is your car over 5 years old? Yes – Replace the pump with an uprated pump, (Usually Walbro 255LPH), be careful of cheap or fake pumps that are not up to the job.

VER MODEL SPEC TRANS ECU ECU PART AFM MAP NOTES
--- --- --- --- --- --- --- ---
Ver 3 GC8 D WRX MT 1S AC721 D55 E AA271 Orange AA090 VF22 EJ20K Yellow Injectors
WRX AT 3S AC740 D34 AA090 TD04 EJ20G Grey Injectors
WRX-RA MT 1S AC722 D68 E AA271 Orange AA090 VF? EJ20K Yellow Injectors
STI MT 6S AD170 D35 E AA271 Orange AA090 VF23 EJ20K Yellow Injectors
STI-R MT 6S AD170 D35 E AA271 Orange AA090 VF23 EJ20K Yellow Injectors
STI-RA MT 6S AD170 D35 E AA271 Orange AA090 VF23 EJ20K Yellow Injectors
GF8 D WRX MT 2S AC730 D32 TD04 EJ20G Grey Injectors
WRX AT 3S AC741 TD04 EJ20G Grey Injectors
STI MT 6S AD170 D35 E AA271 Orange AA090 VF23 EJ20K Yellow Injectors

VER MODEL SPEC TRANS ECU ECU PART AFM
Ver2 GC8C STI-RA MT 7K AC710 D22 AA160 Green
7K = reference code for easy identification.
22611 AC710 = This is the Subaru Part number for this ECU.
22611 (ECU part category)
AC710 (Part revision)
A18-000-D22 = Unisia Jecs part number. (Jecs builds the ECU for Subaru)
D22 (Part revision) this number is usually found on a sticker on the socket. This ties the
case to the ECU board. [up to version 3 afaik]
5X11 = ECU serial number
note: sometimes the ECU revision may be out by a few numbers eg. AC710 -> AC711 This is the same ECU with a minor revision, possibly to the tune or maybe to correct a bug. only Jecs knows.

Impreza 1993-1996
Impreza 1993-1996 UK/GT/Aus WRX
ECU Code 7D or V7 : 11.47psi (UK Spec/Aus WRX)
ECU Code 6D : 11.47psi (GT/Euro model)
Impreza 1993-1996 UK Prodrive upgrade
ECU Code 7D or V7 : 13.64psi (actually the STi 2 6K map)
Impreza WRX 1993-1994
ECU Code W6, U8 or 2C : 11.47psi
Impreza WRX RA 1993-1994
ECU Code W9 : 11.47psi
Impreza STi 1 1993-1994
ECU Code SA : 14.87psi
Impreza STi RA 1993-1994
ECU Code SB : 14.87psi dropping to 13.64psi (very lean fuelling )
Impreza WRX 1994-1996
ECU Code Z4 : 12.7psi
Impreza WRX RA 1994-1996
ECU Code Z5 : 12.7psi
Impreza STi 2 1994-1996 (inc 555 Sp.Ed)
ECU Code 6K : 13.64psi
Impreza STi 2 RA 1994-1996
ECU Code 7K : 13.64psi
Impreza WRX Wagon 1993-1996
ECU Code 1C, 3B, V9 : 10.5spi (peak) dropping to 6.8psi
Impreza WRX Wagon/Saloon Auto 1993-1996
ECU Code B4, V5 : 10.5spi (peak) dropping to 6.8psi
Impreza STi Wagon 1994-1996
ECU Code SC : 12.7psi (actually the Z4 Map from saloon, as has TD05)
Impreza 1997-1998

nice post!

__________________

Long live the WRC

Yes.. It took ages to find all the info... Still needs a few of the stock non-sti 3 plug yellow connectors.. I think all the 4 plug yellow ECUs are there..

I'm trying to go for a STI "75" blue ECU.. Haven't pluged it in... But think i need to add air box temp sensor. Not sure if any other pins need to be moved.. And re-coding for Key chip i guess...

Turbo and injectors as well... Lots to do!

Greart info. ! Thanks Guy !!
And Do you know that can I use AD170 instead of AD722 directly without other modification ?
Thanks again!!
Kelven

This looks promising. This looks like the right place to ask this question.

I have a (possibly) JDM engine and ecu that I (an American) bought from a Canadian "JDM import" company. I have an ecu with a really big "E6" and some other numbers and "AE831" which may or may not be helpful in identifying what car it came from. The engine code on the timing cover of the engine was EJ205DWZKE-019 (and other numbers as well)...

So I'm trying to figure out (on multiple forums, mind you) where did these things come from, did they come from the same car, and if not, how fucked am I?

EJ205 is a 2 litre WRX (not STi) engine. Cant narrow it down much more than that.

Ask a Subaru dealer to search the engine number, they may be able to tell you what it was originally in.

__________________
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Oh yeah, I figured out that my engine, trans and ecu that I bought are actually from a '99 turbo forester. The car runs and drives, but I have a code 45 for the pressure exchange solenoid and the problem appears to be that the ecu isn't switching the circuit to ground.

The dealer probably isn't going to be able to help much since none of these parts are from the USDM range of vehicles.

But does anyone have any ideas about what wrx ecus (Subaru factory ecus or aftermarket) would be compatible with my new engine?

Hi,

Been looking at the info you posted above very interesting.

Im after a little help not sure if you know the info. My car has a 8S ECU Standard. I have bought a 6S ecu with ESL Is there any pin outs I need to do to get this to run on the car or does it need any coding to the car?
Any help would be good thank you.