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Old 04-15-2003, 01:09 AM   #1
Boost4U
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Default DIY harness wiring???

Is there anyone out there who has erformed their own WRX into RS swap and can give us aspiring swapper some insight. Myself, like some, do not have the money to pay for a shop to complete the swap for me and I need some info. What is the best way to tackle the wiring of the new harness. What issues are there with installing a WRX fuel pump, or a Walbro? Any help would be great guys!!!
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Old 04-15-2003, 03:40 AM   #2
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don't take this the wrong way, but it's adressed in almost every thread in this particular forum.
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Old 04-16-2003, 05:35 PM   #3
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Since you're so close to Lachute Subaru, talk to Mark about doing your swap. Less headaches in the long run if you're like me and don't know yer way around a soldering iron.

I've spent some seat time in their handy work and it's sooooooo nice.

-mykr.
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Old 04-17-2003, 12:57 PM   #4
Bigspin
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Default re:

We like souldering irons

Mark
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Old 04-17-2003, 01:13 PM   #5
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yeah, you're looking at 12+ hrs of souldering FUN!
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Old 04-18-2003, 10:10 PM   #6
Boost4U
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I'm not afraid of a little soulder....

ps.

Mark...I've been meaning to call you, I just need to finish exams!!
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Old 04-19-2003, 02:37 AM   #7
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Quote:
Originally posted by Scoobed
don't take this the wrong way, but it's adressed in almost every thread in this particular forum.
I have never seen detailed information on converting the wiring harness here or anywhere else. Everyone just says match up the stock harness to the WRX one and solder... Well ok yeah that is the general idea, but what we need is detailed info on which wires go where. I have the wiring diagrams from both cars, but it isn't very obvious how the 2 harnesses should be combined. If anyone has detailed info on this PLEASE share it.
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Old 04-20-2003, 09:12 PM   #8
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slim - I don't think that shops like I-Speed or Lachute really want to give away their "secrets" when it comes to a step by step to doing the swap. They've invested ALOT of time, money, sweat and tears into perfecting techniques and I think it's fair for them and others like them to keep these methods to themselves to put food on the table.

Also, wiring looms can change at a whim with auto manufacturers. I know this first hand dealing with Ford Motor and their MCR (Material Cost Reduction) programs. I'd assume that Subaru follows a similar practice of trying to cut costs and stay competitive.

Just my 0.02 (adjusted for my honourary Canadian citizenship. )

-mykr.
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Old 04-21-2003, 12:14 AM   #9
slim speedy
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Oh I am well aware companies doing swaps would never give out this kind of information. Nor would I expect them too, they have way to much time invested in that knowledge. However what I was hoping for was that someone who has done the swap themselves would be nice enough to put together this information to help out others. Anyone feel up to it?
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Old 04-21-2003, 01:49 PM   #10
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Again, each car is individual so providing the step by step wiring will apply to only a very select few cars.

The basic procedure you are going to use is as follows:

Locate the non-engine related wires existing on the car and seperate them from the engine related wires. Locate those same wires on the WRX harness. Now you "simply" add in the WRX engine related wires to the existing non-engine related harness and voila. Then you have all your CEL's pulled and spend the next two months retracing everything trying to find where that missing ground is or those two crossed wires.

Unfortunately, I have not done this yet but I am looking to do it in July. Yet unfortunately again, it will be of little help to you since I will be putting this into a 96 L wagon, not an RS.

-Jon
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Old 04-21-2003, 02:43 PM   #11
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Ok so I'm thinking I don't have to mess with any wires other than the ones coming out of the ECU, is that correct? The 2002 WRX has 122 wires out of the ECU, rough estimate is that less the half are engine related. Are these the only wires that need to be matched up and combined with the RS harness? It seems like their should be more than this as people talk about 12 hours worth of soldering time. So what am i missing?
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Old 04-21-2003, 03:34 PM   #12
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It looks to me like it's the front wiring harness and the bulkhead wiring harness that are going to be the focus of the hacking. I'm sure it's not as modular as it appears, but the FSM makes it look like you just need to use the entire WRX engine wiring harness without anything from the older car. I can't find the WRX ECU pinouts right now, but I think most of those were directly engine related.

I think a lot of the 12 hours is not just soldering but achieving the factory look so it doesn't look like a big hack job.

-Jon
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Old 04-21-2003, 07:05 PM   #13
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Nice to see everyone voicing their oppinions. THANKS GUYS

Perhaps some of the veteran Do It Yourselfers could point out some trouble spots and or things to watch out for when wiring??

We all know that hindsight is 20/20
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Old 04-21-2003, 07:25 PM   #14
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Just a question that has been bothering me...

Why do you want to use the stock RS ECU and not use the stock WRX ECU? (assuming RS ---> WRX conversion) It seems that the RS ECU would limit the redline to 6250RPMS.
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Old 04-21-2003, 10:25 PM   #15
slim speedy
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Who said anything about using a RS ECU for a WRX swap? You can't, the redline is the least of the issues, it has no concept of boost or fuel maps for a turbo. It either won't work at all or it would blow the motor. Some people use an aftermarket ECU like the link, but most people use the stock ECU from the model of WRX the engine came from.
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Old 04-22-2003, 02:19 AM   #16
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Default

Quote:
Originally posted by slim speedy
Who said anything about using a RS ECU for a WRX swap? You can't, the redline is the least of the issues, it has no concept of boost or fuel maps for a turbo. It either won't work at all or it would blow the motor. Some people use an aftermarket ECU like the link, but most people use the stock ECU from the model of WRX the engine came from.
Ahh, the boost and fuel issue was also brought up in one conversation. If the engine and ECU are from the same car, why is there such a problem with wiring? Is it from all the accessories (lights, dash, wipers, etc)?
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Old 04-22-2003, 02:24 AM   #17
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Well, from what I know the problem is with splicing the WRX harness and RS harness together. You need to use the WRX ecu, obviously, and you don't want to rewire the whole car, thus grafting the wires from the WRX ecu to the part of the RS harness that feeds the wires in the cabin would be the pain?? Correct me if I have this all messed up!!!
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Old 04-22-2003, 11:03 AM   #18
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It is "easier" to utilize the existing wires in the car and just adapt it to the new engine and ecu versus removing the entire harness and putting in the new harness from another car.

-Jon
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Old 04-22-2003, 03:14 PM   #19
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Is it to expensive to create a new custom harness that's sold seperately? I saw a bunch for Honda's when do their various swaps. I know they're two different animals, but the concept is still the same. Then people could do the swap themselves and the tuners make loot from the custom harness. I don't think harness should be cheap either, like around $500+. Just a thought since I have a plug in play harness for my link.
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Old 04-22-2003, 03:33 PM   #20
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This has been discussed all over the place. Subarus cannot have pre-made harnesses done like Hondas because Subaru chose to change wiring at almost every MY and sometimes more than once during the MY. Since there are already very very few Subarus that might do this swap, there is really no feasible way to mass produce these harnesses. Most of the companies will tell you that they need the car there to ensure an exact harness.

-Jon
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Old 04-28-2003, 09:20 PM   #21
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Re: not wanting to pay someone to do your swap, you might want to look and see what your time's worth.

Can anyone here estimate how many hours they spent performing an engine swap? Is it 50 hours? 100? 200?

If the time spent is nearly the same amount of time it would take you to earn the $$$ to pay a reputable shop to perform the swap, I think you'd be better off paying a shop, since you know they'll either do it right or fix the mistakes for free. And the shop will probably get your car finished quicker too.

That's just my take on it, I haven't performed any swaps, but I've seen a few go bad...


-s-
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Old 04-29-2003, 12:16 PM   #22
slim speedy
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I don't know about the other people here, but I mostly want to do it myself because I like working on my own car. It would be a nice feeling to be able to tell someone you did the work yourself when they ask. Unfortunantly I will most likely have to pay someone to do mine, as I doubt I will have a garage I can use for long enough to do the swap myself. I have pulled off a turbo install, new radiator, and suspensions installs in the parking lot outside my house, but a WRX engine swap might be a bit much.
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Old 04-29-2003, 03:03 PM   #23
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What are you talking about? Mine is going to happen right outside the front door of my apartment.

Of course, I'm shooting for having the engine swapped over and the wiring done in about a week's time.

-Jon
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Old 04-29-2003, 03:50 PM   #24
Rabidbyte
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Default I have to agree. FREE THE INFO!

I'd have to agree with Slim, some of us like that fact that we did some of the work on our cars ourselves. Alot of us also don't have the money to pay someone to do the work. I wouldn't mind working with someone on how to do this, and post on a site. Maybe a make a VFAQ on the swap. Trully I don't think that these shops that do the swap are going to lose any business because we post "The Secret". I even bet we can come up with an adapter for the swap that'll even save the shops time and money. Anyone have any suggestions?
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Old 05-01-2003, 01:51 AM   #25
smallcar
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Default Essential wires

Maybe I can help answer this question having installed 2.2, 2.5, 3.3 and 2.0 turbos into Vanagons.
The wires that need to be integrated into the Main wiring harness are for the following:

Battery power
Ignition power
Speed sensor
Check engine light
Tach signal
Fan relay 1
Fan relay 2
Fuel tank pressure sender
Fuel tank valves (2 or 3)
Fuel level
Fuel temp
Oil pressure
Coolant temp
A/C system
Transmission (if automatic)
Rear defogger
Light switch
Neutral switch
Starter
Fuel pump

Other than these wires, the connections needed from the new harness are connectors that go to the engine, ECU, O2 sensors, diagnostic connectors, fuel pump controller, and the air flow sensor.
I may have missed some connection in this list since I'm working from memory but this gives you a starting place. Simple eh.
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