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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Thu Feb 10, 2011 10:09 pm 
First Gear
Joined: Thu Jun 26, 2003 5:44 pm
Posts: 183
Location: Puyallup WA
I updated the ignition part again.

-Rob


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Wed Jul 18, 2012 3:10 am 
First Gear
Joined: Tue Nov 17, 2009 8:27 pm
Posts: 112
Location: Kelowna BC, Canada
Works great, thank you for the writeup!!

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93 Turbo Wagon, 5mt swap, vlsd, sti slanty, vf10, alk, subframe lockout, gr2's, sti sways.
96 F-350 CCLB Powerstroke
89 Volvo 244, lsx swap


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Wed Jul 18, 2012 5:34 am 
First Gear
Joined: Thu Jun 26, 2003 5:44 pm
Posts: 183
Location: Puyallup WA
good to hear. Thanks for the feedback.


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Mon Jan 28, 2013 3:44 am 
Second Gear
Joined: Sun Jun 15, 2008 4:40 am
Posts: 305
Location: Ellensburg, Wa
So with the pin47-6 purge control being removed from this ecu, do you think it's possible to remove the charcoal canister to help free up some room under the hood?

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VF43 custom FMIC APEXI intake Invidia 3" TBE JDM Ver. 4 RA STi trans (4.44) SPT short shifter rear LSD WRX rear axels coilover suspension JDM 4-pot front brakes drilled slotted rottors Greddy EBC tuned 20G ECU sti 550cc injectors Jecs MAF walbro 255


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Mon Jan 28, 2013 8:04 am 
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Location: Des Moines, Wa
It is possible. I run a 2-port N/A canister instead. It could be my imagination, but the car seems to run better with it connected.

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1992 Legacy SS 5mt, reasonably modified ;)


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Mon Jan 28, 2013 3:56 pm 
Site Admin
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Location: Houston, Tx
Yeah, I'm running a 2-port non-turbo canister and haven't had any issues.

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Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Mon Jan 28, 2013 7:24 pm 
Second Gear
Joined: Sun Jun 15, 2008 4:40 am
Posts: 305
Location: Ellensburg, Wa
No, I'm talking about taking the canister out completely. Whether its 2 port NA or 3 port turbo the damn thing takes up equal amount of room. If the purge solenoid isn't being used, what's the point of having it?

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VF43 custom FMIC APEXI intake Invidia 3" TBE JDM Ver. 4 RA STi trans (4.44) SPT short shifter rear LSD WRX rear axels coilover suspension JDM 4-pot front brakes drilled slotted rottors Greddy EBC tuned 20G ECU sti 550cc injectors Jecs MAF walbro 255


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Mon Jan 28, 2013 8:27 pm 
Fifth Gear
Joined: Fri May 04, 2007 4:09 pm
Posts: 2232
Location: N. ID
Josh replied to your otherpost:

Legacy777 wrote:
You can remove it, but pressure will build up in the gas tank. The normal hiss you hear when opening the cap will become a hisssssssssssssss. I'm serious. I didn't run the canister for a while and at fill ups it hissed for a ridiculously long time.

Does the 20g ECU have any canister purge control pin? If so, I'd just repin that pin.

_________________
Turbo Subies:
'87 GL-10 Turbo 4WD Wagon (pre-Loyale) - SOLD
'90 BJ, EJ22T/DOHC and 5-speed swap - SOLD
'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
'02 WRX GG-SOLD
'96 BD - turbo'd-SOLD


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Tue Jun 30, 2015 9:26 am 
Third Gear
Joined: Wed Dec 06, 2006 11:24 am
Posts: 907
Location: Calgary, AB
Legacy777 wrote:
The MT harnesses should not have a wire there. If they do, I'm not sure where it would go. It should not be grounded though.

It's an input to the ECU. Grounding that pin tells the ECU whether the trans in the car is MT or AT. The ECU will alter idle speeds/loads and timing to properly adjust idle. There may by some additional minor stuff that the ECU changes, but I don't really have any info on that.

Subaru apparently put both sets of info/code into the ECU. When I did my AWD & 5spd swap, I was using my 90 AT ECU hooked up to a MT. All I had to do was snip that MT/AT identifier pin. Everything worked great.

One thing to note. The later first gen non-turbo legacies 92+ apparently had reversed AT/MT identifier pins. They were reversed from what the 90-91 MY's had, and were incorrect when compared to the factory manual. However, that issue does not affect the turbo ECU's, all years 91-94. I bring this up in the event someone is swapping in a turbo motor into a 92+ non-turbo legacy and keeps the existing harness.


rob wrote:
Thanks for the insight Josh. I removed the AT/MT pin concern from the list.


I have a 93 SS that was an automatic and has been swapped to manual. What does this mean regarding the MT/AT pn in this specific case.

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02 WRB WRX
93 White SS "Angel": 4EAT to 5MT 550 Robtune !SOLD!
̶9̶2̶ ̶W̶i̶n̶e̶s̶t̶o̶n̶e̶ ̶S̶S̶ ̶5̶M̶T̶ R.I.P.


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Wed Jul 01, 2015 5:39 am 
Fifth Gear
Joined: Fri May 04, 2007 4:09 pm
Posts: 2232
Location: N. ID
Dynamic Entry wrote:
I have a 93 SS that was an automatic and has been swapped to manual. What does this mean regarding the MT/AT pn in this specific case.


Should not be an issue.

Are there any issues w/your car related to the trans swap? If the car ran fine on the stock ECU after the swap, the EJ20G shouldn't matter, as long as the EJ20G-specific wiring is addressed.
TD

_________________
Turbo Subies:
'87 GL-10 Turbo 4WD Wagon (pre-Loyale) - SOLD
'90 BJ, EJ22T/DOHC and 5-speed swap - SOLD
'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
'02 WRX GG-SOLD
'96 BD - turbo'd-SOLD


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Sun Jul 05, 2015 3:42 am 
Third Gear
Joined: Wed Dec 06, 2006 11:24 am
Posts: 907
Location: Calgary, AB
wtdash wrote:
Are there any issues w/your car related to the trans swap? If the car ran fine on the stock ECU after the swap, the EJ20G shouldn't matter, as long as the EJ20G-specific wiring is addressed.
TD


No, the trans swap is complete with no issues.

The thing is that I never really ran it on the stock ECU, it was always piggybacked or otherwise.

The reason I asked is because it seemed like a unique combination of variables that I have that most others don't. Everything is running great, I just didn't want to miss anything.

Thanks!

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Andrew

02 WRB WRX
93 White SS "Angel": 4EAT to 5MT 550 Robtune !SOLD!
̶9̶2̶ ̶W̶i̶n̶e̶s̶t̶o̶n̶e̶ ̶S̶S̶ ̶5̶M̶T̶ R.I.P.


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Sun Jul 05, 2015 4:07 am 
Fifth Gear
Joined: Fri May 04, 2007 4:09 pm
Posts: 2232
Location: N. ID
FWIW, many have done the swap and then upgraded to the Rob Tune/RT...I got there by doing the RT b4 the 5-speed swap, but no issues.

Have fun!

_________________
Turbo Subies:
'87 GL-10 Turbo 4WD Wagon (pre-Loyale) - SOLD
'90 BJ, EJ22T/DOHC and 5-speed swap - SOLD
'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
'02 WRX GG-SOLD
'96 BD - turbo'd-SOLD


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Wed Jan 18, 2017 9:32 pm 
In Neutral
Joined: Sat Apr 05, 2014 12:12 am
Posts: 39
Location: Denver-Front Range
Ok well this is a serious amateur question, could someone please explain what is meant by merging the pins for the ecu? Cut solder? Seperate from pins then join together. Im slightly confused as i have never done anything like this.


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Thu Jan 19, 2017 6:02 am 
Fifth Gear
Joined: Fri May 04, 2007 4:09 pm
Posts: 2232
Location: N. ID
Use a Scotch-lock or similar connector ( I like the T-taps).

DE-PIN the B48-5 from the ECU harness plug and connect the wire to the B48-21 w/the T-tap, Scotch-lok, etc.

B48-21 needs to stay connected 'as is' so the ECU can use it.

That help?

Google any 'how tos' if want to see it.

This SVX video is almost identical to the '90-'94 Legacy ECU connectors for a How To on De-Pin: https://www.youtube.com/watch?v=ayxEfRvhLEE

GL,
TD

_________________
Turbo Subies:
'87 GL-10 Turbo 4WD Wagon (pre-Loyale) - SOLD
'90 BJ, EJ22T/DOHC and 5-speed swap - SOLD
'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
'02 WRX GG-SOLD
'96 BD - turbo'd-SOLD


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Thu Jan 19, 2017 2:41 pm 
In Neutral
Joined: Sat Apr 05, 2014 12:12 am
Posts: 39
Location: Denver-Front Range
Thats perfext, thanks. I just wanted to make sure i was reading the instructions right. Everything is in place just had to double cbeck.


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Sun Jun 18, 2017 12:08 am 
In Neutral
Joined: Sat Jun 17, 2017 11:56 pm
Posts: 1
I just got my ej20g ecu and I have two ignitors to wire in, this is a great write up and thanks for the help. I do have a question though; why can't I just merge the trigger pins from the ecu before the ignitor instead of wiring in two ignitors and merging the coil triggers? Does it hurt the ecu to back feed the signal? Will it mess with timing control or dwell? I read this article http://www.rs25.com/forums/f106/t64017- ... h-etc.html (sorry for linking to another site if it is forbidden) and this is exactly what supermoose did. It seems like a very simple solution but I'm sure there are good reasons not to do it this way or it would have been recommended already over here. Maybe I could put a couple diodes in there to avoid ecu damage? If that is the worry? I know rob has spent a lot of time doing developing his methods and I completely trust them, I'm just lazy and looking for shortcuts, hahaha.

Thanks,
Alex


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 Post subject: Re: Adapting an EJ20G ECU
PostPosted: Mon Jun 26, 2017 5:39 pm 
Site Admin
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Joined: Tue Oct 15, 2002 11:37 am
Posts: 27105
Location: Houston, Tx
Welcome to the BBS.

I would think if you keep from back feeding signal to the ECU I would think you'd be ok, but it'd probably be good to get some additional feedback. Worst case, you give it a try and let us know. :)

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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