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Old 08-31-2012, 05:52 PM   #1
2_Liter_EJTurbo
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Default 20k to USDM ecu convertion?

It was suggested to me that it may be possible to convert a USDM obd2 ecu to run a ej20k engine...

Sure the displacement is different and it would need a wasted spark to coil on plug conversion and a ton of rewiring...

Has anyone tried it? It would be easy to use a access port to then tune it without spending as much for a stand alone unit.
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Old 08-31-2012, 07:20 PM   #2
69subaru360
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Search. It doesn't work. We've been over this many times.
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Old 08-31-2012, 08:00 PM   #3
2_Liter_EJTurbo
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Quote:
Originally Posted by 69subaru360
Search. It doesn't work. We've been over this many times.
Well first off if we had discuses it why would I have bothered with this thread?

And there is no way it's impossible... I am under no grand illusion that it's not a plug and play matter. But anything is possible depending in how much u put into it.

An engine needs fuel, spark, and compression happening at the correct time for it to run that is it. So it an ecu can have its ignition timing and fuel adjusted then it should run.
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Old 08-31-2012, 11:14 PM   #4
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It really has been gone over many times. And a search really would bring it up.

Short answer....The cam and crank timing is very different and the proper sensors and cam gears are not a bolt on. Custom machine work would be involved to the point the general consensus is to just do a complete USDM swap as parts are now fairly cheap.
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Old 09-01-2012, 12:01 AM   #5
elislider
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there are no feasible or recommended ways, because phase 1 engines are very different than phase 2 physically and electronically.

possible ways:
- run a USDM EJ25D intake setup and then the EJ25D ECU and a piggyback
- somehow find a place for all the USDM WRX sensors and wiring on the EJ20K manifold, and run the USDM WRX cam/crank gears. this wont work without extremely customized work, because the idle air, throttle body, and egr are all completely different

only recommended way involves v5/6 EJ205/EJ207 swaps; you can run the USDM WRX intake manifold, and cam/crank gears. cant do the USDM WRX manifold on the EJ20K, bolt pattern is different
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Old 09-01-2012, 11:19 AM   #6
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ok not technically impossible

highly unfeasible
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Old 09-01-2012, 01:28 PM   #7
Sasksubie69
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Sounds hard. A fellow i know is going through the same dillema
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Old 09-01-2012, 01:36 PM   #8
69subaru360
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Get the new esl live board for the 20k and be done with it.
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Old 09-02-2012, 09:57 AM   #9
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in my searching today it seems that link released a plug in G4 for the ej20k that no one seems to have know about
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Old 09-02-2012, 12:22 PM   #10
2_Liter_Turbo
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What would be the point of converting it over? You just trying to find cheaper alternatives for user-programmable engine management?
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Old 09-02-2012, 01:33 PM   #11
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I have an 02 2.5 ts with a jdm v3 in it. is there anyway possible to run a usdm ecu and tune it for the v3? i picked up an entire 02 wrx bulkhead and ecu. Can i make this work?
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Old 09-02-2012, 03:04 PM   #12
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Quote:
Originally Posted by Jaxx View Post
in my searching today it seems that link released a plug in G4 for the ej20k that no one seems to have know about
I thought that was common knowledge.
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Old 09-02-2012, 03:15 PM   #13
vecon121
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what is the esl live board? is it an ecu replacement or piggyback? Does it add obd2?
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Old 09-04-2012, 02:00 PM   #14
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Quote:
Originally Posted by i_c_the_light View Post
I thought that was common knowledge.
The ESL live board is common knowledge. The issue is finding a supplier for the board and a local tuner. In BC, Oregon or Washington I am unaware of any suppliers or tuners for ESL live.
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Old 09-04-2012, 02:10 PM   #15
69subaru360
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Quote:
Originally Posted by TommyAtomic View Post
The ESL live board is common knowledge. The issue is finding a supplier for the board and a local tuner. In BC, Oregon or Washington I am unaware of any suppliers or tuners for ESL live.
ESL will sell you the board software and cable direct if you live in the US or Canada since they have no distributors. Tuning is straightforward if you can tune most common management you can tune ESL it's nothing special.
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Old 09-05-2012, 05:19 AM   #16
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Quote:
Originally Posted by 69subaru360 View Post
ESL will sell you the board software and cable direct if you live in the US or Canada since they have no distributors. Tuning is straightforward if you can tune most common management you can tune ESL it's nothing special.
The above is correct. Most US distributors think there would be insufficient volume for 92-98 Impreza, Forester and Legacy as I believe they were not available as official imports. I have no numbers for the volume of candidate Japanese imports and would be interested in opinions.

Info:

www.enduringsolutions.com/InfoSheet.pdf

Manual:

www.enduringsolutions.com/Manual.pdf

FB:

http://www.facebook.com/pages/Enduri...d/341833312224

Cheers

Andy
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Old 09-05-2012, 01:41 PM   #17
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Rob is doing a tune for the EJ20K.
Wait till he is done and youll have a reliable OTS plug and play ECU.
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Old 09-06-2012, 12:09 AM   #18
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oh my god my car does nor exist because it i cant possibly have been driving it for 2 years with the 1998 rs ecu running the 20k.
Has it been easy making it all work? no
Would i recommend it to someone else? no
Would i do it again? without thinking twice.
For about a year ive been using an emanage ultimate which made the car run far smoother.
The only sensor that didnt work with my 1998 rs ecu was the throttle body which the voltage was reversed. the front clip i got was a 1997 sti manufactured in early 1997 and my rs was made in late 1997 so that may be why my car just works.
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Old 09-06-2012, 05:28 AM   #19
stockhatch
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Quote:
Originally Posted by blessthekellen View Post
Rob is doing a tune for the EJ20K.
Wait till he is done and youll have a reliable OTS plug and play ECU.
Is this an EPROM board? i.e. Not mappable?
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Old 09-06-2012, 09:50 AM   #20
RallyColtTurbo
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Quote:
Originally Posted by turboaddiction View Post
oh my god my car does nor exist because it i cant possibly have been driving it for 2 years with the 1998 rs ecu running the 20k...........
Fair enough. My assumption was that the OP was refering to a USDM WRX ECU.

The EJ25D and the EJ20K are not that far apart (as you found out), with the major difference being the turbo.
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Old 09-06-2012, 11:56 AM   #21
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Quote:
Originally Posted by turboaddiction View Post
oh my god my car does nor exist because it i cant possibly have been driving it for 2 years with the 1998 rs ecu running the 20k
Again, in English please.
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Old 09-06-2012, 12:14 PM   #22
69subaru360
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Quote:
Originally Posted by turboaddiction View Post
oh my god my car does nor exist because it i cant possibly have been driving it for 2 years with the 1998 rs ecu running the 20k.
Has it been easy making it all work? no
Would i recommend it to someone else? no
Would i do it again? without thinking twice.
For about a year ive been using an emanage ultimate which made the car run far smoother.
The only sensor that didnt work with my 1998 rs ecu was the throttle body which the voltage was reversed. the front clip i got was a 1997 sti manufactured in early 1997 and my rs was made in late 1997 so that may be why my car just works.
98 is phase 1. 02 is phase 2

op is asking about AP, so phase 2

Which doesn't work.
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Old 09-06-2012, 12:37 PM   #23
turboaddiction
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Quote:
Originally Posted by 69subaru360 View Post
98 is phase 1. 02 is phase 2

op is asking about AP, so phase 2

Which doesn't work.
I did not catch the part about using access port which is the only hint that hes using a usdm wrx ecu. I was half asleep when i read and replied this post from my phone.
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Old 09-20-2012, 02:08 PM   #24
Kirrsace
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yes you can run your USDM ECU, With a stand alone engine management.

Thats what I am doing with my EJ20K. 98 Full harness with ECU. All stock and running engine management.
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Old 09-21-2012, 12:10 PM   #25
2_Liter_EJTurbo
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I am currently running the stick 97 WRX ecu with the 97 harness spliced into my 93 dash harness.

Obviously a stand alone unit would be the best option but being I'm a poor collage student dropping 1300+ on a ecu and another 900 or so on dyno time is a bit of a stretch if I still want to eat and stay warm over the winter.

I have a vf39 and 740cc injectors that would love to have proper engine management... Have a friend with a DSM who I autocross with and his car is ruffly the same speed and mine... Only he is one of the best drivers I have seen haha so I need more power!

I know opinions are like butt holes and everyone has one... But if you had to pick one single best option when considering cost an functionality what would it be?
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