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Old 10-14-2003, 06:02 PM   #1
Aspen_2.5RS
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Post Swap entire WRX harness or splice into 95L harness?

Hi,

I'm trying to decide what would be best. I have an entire 02 wrx harness (still in the car). Some people say it would be best to strip my 95L wagon and put the wrx harness in. Others think splicing into the 95L harness would be better.

I plan on using the gauges from the wrx with some fabricating. I've seen it done by another member, forgot who. Also the 95L does not have power windows, power door locks, or cruise control.

Thanks,

Cam
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Old 10-14-2003, 09:24 PM   #2
Homemade WRX
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I still say make it easy on yourself and install the WRX harness with it's electornics. Take out all the extra stuff that doesn't apply.
Take it easy, Micah
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Old 10-15-2003, 11:04 AM   #3
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Just do a little searching. This has been covered quite a few times now.

The most consistant decision is that of mating the WRX engine harness and some parts of the BWH with the existing cars harnesses.

-Jon
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Old 10-20-2003, 08:27 PM   #4
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does anyone know the differences between an rs harness and a wrx harness?
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Old 10-20-2003, 10:48 PM   #5
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Default Re: ?

Quote:
Originally posted by raydadick
does anyone know the differences between an rs harness and a wrx harness?
A lot. RS has 3 plugs going into the ECM, the WRX has 5.

I think splicing the two together is a much better way to go. Because I see no reason why you should pull appart the entire car to put the whole harness in. I've done the splice method and so long as you label your wires properly you shouldn't have any issues, unless you are really bad at soldering.

Z
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Old 10-20-2003, 11:01 PM   #6
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I'm glad I stifled the sarcastic remark. What Zephyr said was well put.

They are different enough that you can't just fudge it in, however they are similar enough that many things can be reused by a simpler merger of harnesses.

-Jon
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Old 10-20-2003, 11:25 PM   #7
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Well, I don't have an RS. My 95L is OBDI and I'm not sure how easy it would be to convert that. I'm also planning on using the wrx cluster. I'm not even going to attempt to sound like I know what I'm doing when it comes to the wiring portion, b/c I don't.

AWJunkies, who has actually done an engine swap with the wiring said he thought it would be best to keep the harness for the rear of the car and swap out everything in the front. The fuel controller would still have to be integrated.

Right now I'm trying to sort through all the misinformation that people post who "think" they know about these swaps, but actually are just guessing. You know who you are.

My car is driveline less now, with parts everywhere, so I don't want to hear, "I think". Where are the experts?

Cam
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Old 10-21-2003, 09:07 AM   #8
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<--- is in the middle of doing yet another one. If you have any questions feel free to contact me. Even with the 95 I would still merge the two harnesses. Use what you need to use don't make extra work. It's easy enough to pass the OBDII plug and wires from the one side of the car to the other or if you want just leave them floating around until later since they should already be a part of the harness.

Z
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Old 10-21-2003, 09:49 AM   #9
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I agree with Zephyr,

With a 95 harness, it is trickier than going from a RS to a WRX,. But if you use the parts of the WRX harness that you need such as the two oxygen sensors, vehicle speed sensor, the engine stuff, and splice in the misc stuff from the 95L, it will work out.

If you also use the WRX fuel pump and Purge cannister stuff, your life will be even that much easier.
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Old 10-21-2003, 09:53 AM   #10
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Quote:
Originally posted by EJ25
If you also use the WRX fuel pump and Purge cannister stuff, your life will be even that much easier.
Ah, but what of the fuel pump cage? The older cars use a shorter/fatter fuel pump and I don't think the WRX fuel pump can simply be used. What's more, the WRX requires fuel tank pressure, fuel temp, and a couple other things not present on the older gastanks.

-Jon
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Old 10-23-2003, 12:27 AM   #11
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I'm curious about that as well. I guess I have a fat stubby fuel pump as well.

I really do not want to change out the gas tank. What needs to be swapped out on the in tank "cage"? Is it feasible to swap the entire "cages" without problems and get an accurate gas level reading? Please keep in mind I'm going to be running the wrx gauge cluster so if it needs any special sensors or what not (ones my L doesn't have).

Thanks,

Cam
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Old 10-23-2003, 11:13 AM   #12
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There are numerous differences between the L's and the RS's. I did the swap into my 94 and there are so many differences in the systems that I think it would be easier if you have the scrap car to mod your interior to use the WRX's controls(A/C, cruise, heat, blower, defrost...). There are some things from my swap that still aren't working quite right and well the A/C isn't working at all. The only other problem is that I have a rev limiter/safe mode due to either my MAF sensor not being hooked up (one's on the way) or the speed sensor problem.

take it easy, Micah

I think the swap would be much less time consuming, run better, and be easier if you were to just swap the WRX components/controls into the car.
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Old 10-23-2003, 01:53 PM   #13
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does anyone who has completed swapping an ej20t into an rs (i have a 98) have some sort of wiring schematic to splide the two harness together orsome sort of help with this chore. it is the only thing i am worried about with the swap which is obvious, the mechanicals is a short afternoon.
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Old 10-23-2003, 01:58 PM   #14
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where can i get a wiring harness for an ej20t?
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Old 10-23-2003, 02:14 PM   #15
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No schematics have been made because Subaru is notorious for making mid-model year wiring changes. As such, you can get help and suggestions, but ultimately it is up to you to figure out the wiring. A sad reality I guess. What you will need are the wiring diagrams for both your current car and the car from which the drivetrain was sourced, lots of time, a volt-ohm meter, and an internet connection to ask when you get stuck

-Jon
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Old 10-23-2003, 02:42 PM   #16
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what if you're not sure what car it cameout of? is a legacy turbo schematic much different from a wrx? all i know now is that im getting a ej20t from japan
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Old 10-23-2003, 03:06 PM   #17
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I HAVE THE COMPLETE WIRING DIAGRAM FOR 98-99-00 RS AND 02 WRX IF IT CAN HELP SOMEONE, I WILL BEGIN SHORTLY TO SWAP MY 96 OBS WITH A WRX POWERTRAIN SO I'LL PROBABLY BE ABLE TO ANSWER A FEW QUESTION IN THE NEXT MONTH

WHAT IS THE ISSUE WITH THE FUEL CONTROLLER, AND SENSOR WERE ARE THOSE LOCATED , AND WHAT IF I DON'T USE THAT
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Old 10-23-2003, 04:19 PM   #18
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Quote:
Originally posted by graff
WHAT IS THE ISSUE WITH THE FUEL CONTROLLER, AND SENSOR WERE ARE THOSE LOCATED , AND WHAT IF I DON'T USE THAT
The issue is you are using the caps lock and it's really anoying. If you do no use the Fuel Pump controler you may run rich. The fuel pump controler has 3 cycles that correspond to the throtle, the engine temp and a host of other items that the ECM reads. If you are gonna run without the FPC you will probably end up having to hardwire in a switch to control your fuel pump since it is controlled by the ECM on all Subaru's. Do yourself a favor and just pick the part up it will make things alot nicer in the long run.

Z
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Old 10-23-2003, 04:24 PM   #19
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Quote:
Originally posted by graff
WHAT IS THE ISSUE WITH THE FUEL CONTROLLER, AND SENSOR WERE ARE THOSE LOCATED , AND WHAT IF I DON'T USE THAT
What sensor are you referring to? The fuel pump controller is located in the passenger side rear fender of the WRX.

-Jon
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Old 10-23-2003, 10:34 PM   #20
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Homemade Wrx,

What all did you change out in regards to the fuel pump? How did you get around the fact that your car has a stubby pump? (if it does).

I'd really like to avoid changing out the gas tanks if at all possible. But, I want the pump to work correctly along with giving me an accurate gas reading. I know your situation is a bit different since you kept your stock cluster, though.

Thanks,

Cam
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Old 10-23-2003, 10:37 PM   #21
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for the pumps...the only difference is that ours is thicker than the RS's and WRX's. They make sleeve kits for fuel pumps just for this reason. It is a rubber sleeve that fits over the pump and then fits onto the mount, thus making the skinny WRX pump fit onto the fat pumps mount....tada
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Old 10-23-2003, 10:40 PM   #22
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Thanks Micah. Where'd you get your sleeve?

Cam
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Old 10-23-2003, 11:20 PM   #23
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local parts store...advanced auto
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Old 10-23-2003, 11:54 PM   #24
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I understand how to "make" a fuel pump fit, but I'm more concerned with the wiring down at the fuel tank. There are sensors that the USDM ECU requests that the older Imprezas simply do not have. It is those sensors, that I ask about. Fuel temp is one such sensor.

-Jon
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Old 10-24-2003, 12:19 PM   #25
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anyone know if its difficult to swap a motor from an automatic into a manual? i just found an auto front clip and might consider it. just curious about if the computer is different causing it to not work or be more difficult
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