early ej20g questions

[lJlDlMl]

i found a really good deal an early legacy jdm ej20g with the air/water intercooler set up and i have some questions
1. are parts of this older g engine interchangable with new ej20g ie. intercooler, tdo5 turbo etc?
2. this engine comes without harness. will the newer ej20g engine harness and ecu work on this engine?
3. will this engine bolt up with my 2.5 transmission for the time being?
3. anyone running this setup with pics and dyno charts?

sorry for the newbness but i want to be absolutely sure before i commit to it.

im only lookin for roughly 250-300hp out of it for mild autocrossing and spirited runs through the mountains.

[RallyColtTurbo]

Originally Posted by lJlDlMl

i found a really good deal an early legacy jdm ej20g with the air/water intercooler set up and i have some questions
1. are parts of this older g engine interchangable with new ej20g ie. intercooler, tdo5 turbo etc?
2. this engine comes without harness. will the newer ej20g engine harness and ecu work on this engine?
3. will this engine bolt up with my 2.5 transmission for the time being?
3. anyone running this setup with pics and dyno charts?

sorry for the newbness but i want to be absolutely sure before i commit to it.

im only lookin for roughly 250-300hp out of it for mild autocrossing and spirited runs through the mountains.

1. yes. The pistons and the heads are the major differences between Legacy and WRX EJ20Gs. Almost everything bolted to the longblock is interchangable. Legacy and WRX EJ20G heads use different coils and up-pipe support brackets however.

2. yes. There are slight differences, such as the type of crank and cam sensors, but the wiring "as a package" is interchangable. "As a package" means use all WRX wiring or all Legacy wiring. There are close enough to work with each other (if no other choice), but you will need to double-check the proper diagrams and move a few pins. WRX EJ20G ecus are a popular up-grade for Legacies in countries that got them with the EJ20G.

3. I am running a Legacy EJ20G using a USDM Legacy turbo harness, a WRX EJ20G Power FC, USDM Legacy coil pack and a SVX ignitor. It is using a WRX EJ20G TD04, black "slanty" intercooler and a USDM WRX downpipe. Other than a few electrical details it all bolted together. No dyno charts, but it does give you an idea of what is possible with the proper research.

[lJlDlMl]

thanks alot. are you running a jdm ej20g? and is the gd coil pack conversion for the ej20g still applicable to these engines?

[RallyColtTurbo]

I am running a JDM Legacy EJ20G. I am not using the coil-over-plugs system from that motor. I am using a USDM Legacy turbo coilpack and traditional plug wires.

The Legacy EJ20G heads (identified by 2 bolts holding each coil) do not accept GD coils without grinding them. You can make them fit if you want. Search over on RSLibertyClub to find examples.

[DHRDAN]

Originally Posted by lJlDlMl

thanks alot. are you running a jdm ej20g? and is the gd coil pack conversion for the ej20g still applicable to these engines?

sorry i'm going to go out a limb here, I could be TOTALLY wrong, but the newer USDM WRX's are not Ej20G's.


If you want 300hp at the crank or even the wheels, that's going to be a TALL order.

Am I wrong in asking this?


You seem to be wanting a lot of HP for the engine you describe.


Edit: SOunds like you want to drop in a JDM engine into your 2.5RS??????? Correct?

[Marnix]

300 hp at the crank is not difficult to achieve, the stock injectors just about max out at 1.2 bar boost.

Decent engines although lifters can be noisy. Some say stay away from those engines for that reason, but I do not agree.

There's a coil pack conversion thread stickied here so read away. And don't mind DHRDAN, he's just wasting band width.

[DHRDAN]

Originally Posted by Marnix

300 hp at the crank is not difficult to achieve, the stock injectors just about max out at 1.2 bar boost.

Decent engines although lifters can be noisy. Some say stay away from those engines for that reason, but I do not agree.

There's a coil pack conversion thread stickied here so read away. And don't mind DHRDAN, he's just wasting band width.

Kids talking about a 20g not even a 20k, good luck with a JDM wrx build to 300hp at the crank that is easy.


If this were true everyone would be doing it. No one would need the STI.

but again you're a fanboy, so i'm not too concerned.

[Marnix]

I'm a fanboy with first hand experience. Go figure.

[suberdave]

i am currently running a later (95-96) EJ20G, and have been for almost 5 years now.
it is 100% stock inturnals, with lots of bolt-ons and a ViPEC standalone ECU.
i am currently putting down 293AWHP 276AWTQ. this car is my daily driver and has never let me down. i take it to the race track a few times a year, and drive it hard daily.

i would can the AWIC and do the coil conversion, but then you should have a good little engine.

dont listen to the nay-sayers. I have proof that an EJ20G can be ran at 250-300HP all day long...



-=Suberdave=-
www.suberdave.com

[lJlDlMl]

superdave saves the day. ive done plenty of research on ej20g difference on wrx models and sti models. all is basically the same with forged internals. main difference on the g's wrx and sti is the piston, turbo and ecu. i just wondering because all the reseach i done was on the gc ej20g not the early legacys ej20g. but from the sound of it all things are relatively the same disregarding the cam or crankshaft sensor. how hard would it be to source a legacy ej20g harness and ecu? and if i cant find one would a gc ej20 harness work? and what pins need to be switched around for it to work on the legacy.

[RallyColtTurbo]

Either a Legacy or WRX EJ20G harness will work. WRX are easier to obtain in North America because of the number of imported "swaps", while Legacy motors tended to be imported (or at least sold) as "motors".

The layout of the harness is the main difference between the two. The actual sensors are virtually identical. WRX harness has the ECU under the floorboard and the cam, crank and knock sensors are part of the engine/intake manifold harness. The Legacy has the ECU under the dash and the cam, crank, and knock sensors have long leads that join the firewall/bulkhead harness. The ECU pinouts are virtually the same, with the Legacy having a few extra pins to support the A/W intercooler and the P/S on some models.

In a pinch a USDM '91-'94 Legacy turbo harness can be used to run a EJ20G.

[Matt Monson]

Unless you are putting this into a 1st Gen legacy and going RHD you don't care if it's a Legacy or Impreza wiring harness. Once it's stripped to it's basic elements you won't even know the difference. Get whatever you can find for cheap. Sometimes prestripped ones even come up in the classifieds.

I chuckle when DHRDan posts that 300chp from an Ej20G is a tall order. This is an engine that had between 240 and 260chp from the factory. A DP and exhaust is good for 20-25chp. Add another psi of boost over stock and BAM you're at 300chp. It's that easy. None of this "get a tune" crap. None of this maxxed out injector garbage. Dan's just bitter that he spent $5000 on his Ej257 swap and guys with $1000 Ej20G's and a boost controller can hang with him at the Saturday night drag races. He bashes anything JDM because he secretly wishes he had one but is bitter that he lives in CA and doesn't know the right people to get it past smog. Dan's just bitter in general.

[lJlDlMl]

the process of the wiring is the same as other jdm swaps am i correct by merging the current car harness to the jdm engine harness? would anyone have a pinout or diagrams for a ej20g either legacy or wrx? are the sf5 forester harness and 2.5rs harness are practically the same? i plan on buying both usdm and jdm harness to merge myself on spare time while keeping my car running for school and work.

[i_c_the_light]

Originally Posted by DHRDAN

sorry i'm going to go out a limb here, I could be TOTALLY wrong, but the newer USDM WRX's are not Ej20G's.


If you want 300hp at the crank or even the wheels, that's going to be a TALL order.

Am I wrong in asking this?


You seem to be wanting a lot of HP for the engine you describe.


Edit: SOunds like you want to drop in a JDM engine into your 2.5RS??????? Correct?

You have no idea do you.

[RallyColtTurbo]

Originally Posted by lJlDlMl

the process of the wiring is the same as other jdm swaps am i correct by merging the current car harness to the jdm engine harness? would anyone have a pinout or diagrams for a ej20g either legacy or wrx? are the sf5 forester harness and 2.5rs harness are practically the same? i plan on buying both usdm and jdm harness to merge myself on spare time while keeping my car running for school and work.

Yep, basically the same merge as any other swap. As Matt mentioned, the only really easy one to wire (AKA basically no wiring) is an EJ20G into a first gen Legacy.

Pinouts are available. PM me and I can email, but I believe links are posted if you search them up.

IIRC, Forester is more closely related to the V3-4 EJ20K motors. There is some grey area in those years. Subaru continued with the EJ20G nomenclature on lesser motors, but externally and electrically they are EJ20K motors. You can tell by looking for coilpacks, plug wires and under-the-manifold turbo inlet.

I know nothing about USDM 2.5Rs harnesses, sorry.

[sniper512]

Originally Posted by suberdave

i am currently running a later (95-96) EJ20G, and have been for almost 5 years now.
it is 100% stock inturnals, with lots of bolt-ons and a ViPEC standalone ECU.
i am currently putting down 293AWHP 276AWTQ. this car is my daily driver and has never let me down. i take it to the race track a few times a year, and drive it hard daily.

i would can the AWIC and do the coil conversion, but then you should have a good little engine.

dont listen to the nay-sayers. I have proof that an EJ20G can be ran at 250-300HP all day long...



-=Suberdave=-
www.suberdave.com

I am running Rob's 550 Tune at 18psi. I must be somewhere close to Suberdave's power. I to run daily and use launch control on a regular basis. Engine has not let me down yet just the drivetrain. I am now running a 6MT swap.

[suberdave]

here are a bunch of EJ pinouts, i put them togther for different swaps i did. and some i took from other docs...

EJXXX ECU pinouts.xls

-=Suberdave=-

[Jaxx]

Originally Posted by suberdave

here are a bunch of EJ pinouts, i put them togther for different swaps i did. and some i took from other docs...

EJXXX ECU pinouts.xls

-=Suberdave=-

parts of that look familiar

[eg33GC]

man this thread makes me want to ditch the eg33 for a 20g!

[lJlDlMl]

thanks guys i just went and bought the engine. i was able to strike a deal with him. i went over and checked the engine leak down test was in the green on all 4 cylinders. turbo had no shaft play. it was at 89xxxkm from an auto. now the next question is how is the vf11 turbo compared to a td04 (max power gain)?

[Matt Monson]

They are pretty similar if you are comparing the vf11 to a USDM td04. If you can get your hands on a JDM td04 it's got a little bit more to it. However, of the early 90 degree turbos, the td05 is the best bet if you can afford one.

[i_c_the_light]

Originally Posted by lJlDlMl

thanks guys i just went and bought the engine. i was able to strike a deal with him. i went over and checked the engine leak down test was in the green on all 4 cylinders. turbo had no shaft play. it was at 89xxxkm from an auto. now the next question is how is the vf11 turbo compared to a td04 (max power gain)?

Originally Posted by Matt Monson

They are pretty similar if you are comparing the vf11 to a USDM td04. If you can get your hands on a JDM td04 it's got a little bit more to it. However, of the early 90 degree turbos, the td05 is the best bet if you can afford one.

This is a 20G...not a 22T. VF-11 != VF-10.

[impreza_GC8]

Originally Posted by RallyColtTurbo

I am running a JDM Legacy EJ20G. I am not using the coil-over-plugs system from that motor. I am using a USDM Legacy turbo coilpack and traditional plug wires..

I have a similar setup to this.