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Old 07-15-2002, 07:05 PM   #1
danc
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Default Experiences with USDM WRX engine into GC8?

Has anyone posted their experiences/impressions on the final result? I haven't seen a post like that. Very curious how it drives, how it compares with GD WRX, how the gear ratios feel with the 2.0T engine vs. the 2.5.

Thanks.
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Old 07-15-2002, 08:14 PM   #2
alfriedesq
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it feels great . . . its much lighter - - but its a big job
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Old 07-15-2002, 08:53 PM   #3
luvmyrs
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I love it. Wouldnt have it any other way.
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Old 07-15-2002, 09:34 PM   #4
christoph1371
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you can ask guys in the BAIC forum as well.
My OBS conversion is fine, drives well, and it's great to watch M3's expressions while my grocery getter swooshes by them,lol.

keep in mind "shooshes" is an embelishment. nevertheless it is wayyyy funny.
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Old 07-16-2002, 04:49 AM   #5
kaos200
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can someone explain what would need to be done with the wiring harness or who can do it?
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Old 07-16-2002, 01:00 PM   #6
christoph1371
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We can do it. We have done it 5 times and worknig on number 6.
you cannot make a harness to make it any easier. It is a lot of cutting and splicing and soldering.
It takes us between 17-22 hours depending on the car and the lack of sleep

chris

i-speedusa.com
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Old 07-16-2002, 01:02 PM   #7
HndaTch627
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Quote:
Originally posted by alfriedesq
it feels great . . . its much lighter - - but its a big job
hwo the hell do you figure?? the WRX power plant weighs damn near 400lbs the rs power plant weighs in at about 200...much lighter??
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Old 07-16-2002, 01:09 PM   #8
Shinji N
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I don't know about you, but I can easily notice a 300-400 pound difference.... (I'm talking about difference between a GDA with the 2L and the GC8 with a 2L.)


And about the wiring harness, I'm not asking for "trade secrets" exactly but why does the harness need to be spliced at all if you're using the wrx ecu and engine. Are there just a couple wires that aren't long enough or something? It's not like you're going to have more/less sensors if you're using both the ecu and engine from the same car.
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Old 07-16-2002, 03:11 PM   #9
HndaTch627
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Quote:
Originally posted by Shinji N
I don't know about you, but I can easily notice a 300-400 pound difference.... (I'm talking about difference between a GDA with the 2L and the GC8 with a 2L.)


And about the wiring harness, I'm not asking for "trade secrets" exactly but why does the harness need to be spliced at all if you're using the wrx ecu and engine. Are there just a couple wires that aren't long enough or something? It's not like you're going to have more/less sensors if you're using both the ecu and engine from the same car.
because you need a MAF sensor to make it work and their harnesses are different and the GC8 doens't have the wiring for that
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Old 07-16-2002, 03:19 PM   #10
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and what else doec the ecu control besides the engine? you'll need to get into those wires/plugs too like the maf...


woot - there is one difference...any others


to be more clear. the ecu controls more than the engine. If you want to maintain control you will have to integrate your old car to the new car.
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Old 07-16-2002, 03:45 PM   #11
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Quote:
Originally posted by christoph1371
and what else doec the ecu control besides the engine? you'll need to get into those wires/plugs too like the maf...


woot - there is one difference...any others


to be more clear. the ecu controls more than the engine. If you want to maintain control you will have to integrate your old car to the new car.
exactly, people don't realize that EVERYTHING is pretty much controlled thru the ECM/PCM, it's not just engine functions.

jeremy
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Old 07-16-2002, 04:17 PM   #12
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pretty darn near everything is right. That's exactly why the whole wiring dileo in a conversion/swap is a pain.
you have a new engine plus a new ecu and you need to make it all work in an old car with an old ecu.... aaackkk just the thought of it makes me wonder why i put myself through the torture.
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Old 07-16-2002, 06:30 PM   #13
garface
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I think alfried means the car is lighter than the GDA.
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Old 07-16-2002, 11:33 PM   #14
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so what about a link plug-in? would the wiring be a PITA with that also? since it replaces the ECU could you control the other functions with it also?
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Old 07-16-2002, 11:50 PM   #15
erice1984
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I have the same questions as Pappa Smurf. I am looking to do the swap and I have had my eyes set on the Link Plug-in ECU. Couldn't one just change the settings on what is needed since the whole damn thing is completely customizable and programmable?

May need some wire splitting/cutting but not as near as much as the WRX ECU in the GC8 chassis.

-Eric
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Old 07-17-2002, 12:29 AM   #16
Marcin
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I suppose, even with Link, you need to splice the according sensors into the harnes to plug in the ECU

I would like to get my hands on a USDM EJ20 w/ ecu , and swap it into my RS, while keeping the RS tranny. Any potencial problems with keeping the RS tranny?

Last edited by Marcin; 07-17-2002 at 12:48 AM.
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Old 07-17-2002, 01:16 AM   #17
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you still need to re-wire the car to the WRX ecu even with the link. The link HAS to be reading something in order to manipulate the data.

the stock rs tranny is fine.
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Old 07-17-2002, 05:01 AM   #18
Shinji N
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Thanks for the answers. I see exactly what the shop manuals are needed for now. I also would like to say that the website looks like it's comming along very well and that I appreciate you putting out this information.
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Old 07-17-2002, 08:00 AM   #19
erice1984
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What sensors is the RS lacking that the ej20 needs?
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Old 07-17-2002, 12:05 PM   #20
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just a thought but would you consider selling a how-to manual christoph?

its a big country.. it shouldn't cut in to your business
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Old 07-17-2002, 12:52 PM   #21
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We thought about making a "kit" for conversions. However, Each MY has these little differences that makes the wiring a pain. You'd think that they would all be the same. But they are not. To give you an idea of Wierd sh it I have found ...I traced a wire (black) that eventually turned into brown then turned back in a loop, into itself. There were no connections or spawns. it was just like a freakin circle...WTH?!
I have seen subaru change wire colors, switch pin outs (yes I have seen this too), and even use the same colors for power and ground!?
All of this stuff keeps us from doing a "kit". we document each car and have yet to do a same MY to confirm all this wierd stuff. We want to eventually do a "kit" with a manual. But until we can be %100 certain that it will work, we will not put out anything.
Chris

side note: The more cars/wiring we get into we start to notice that all the MY changes coincide with Subaru Mgmt. changes, hahaha.
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Old 07-17-2002, 01:42 PM   #22
erice1984
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omg. that's messed up, no wonder the infamous grounding mod has helped some people...go figure

Sounds interesting, I have no problem with wiring, my dad was an electrical engineer and I learned a lot from him, but as the saying goes, "check twice cut once".

BTW, what kinda sensors is the RS lacking that the ej20 needs?
-I know one may be that pesky o2 sensor by the up pipe?
-but what else?

Thanks
-Eric
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Old 07-17-2002, 03:02 PM   #23
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just so you guys know, christoph can't give you all the answers for the same reason i can't, if he did then he and i would be out of a job....there are sensors that are missing...and FWIW a WRX swap with a WRX ECU is emissions legal, a WRX swap w/ standlone engine management is NOT emissions legal.

jeremy
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Old 07-17-2002, 04:15 PM   #24
ImportInvasion
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Thumbs up wiring

It is possible to swap a WRX motor into a gc8 impreza while maintaining the stock ECU and wiring. For example, I swapped in a ver4 WRX EJ20 motor from Japan into my 95 EJ18 L model and ran it with the EJ18 ECU and wiring harness. I had to use the EJ18 throttle body, idle air controller and maf, but most of the other electronics on the EJ20 engine are compatible with the EJ18 ECU. That being said, it is almost a worst case scenario. I ran all right, but it is not ideal. It did make the installation easier though. It would be best to keep the stock ecu and wiring to control everything but the engine, and use a aftermarket "wire in" ecu like the Link Plus wire-in to control the engine.

-NOah

p.s. thumbs up to i-speed for the valuable info! if i were out west i would get you to do the wiring for my swap
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Old 07-17-2002, 05:30 PM   #25
erice1984
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Now how would those two work together? I imagine the stock ecu would put up a fit when it cant control the engine anymore.

-Eric
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