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Old 09-13-2010, 05:29 PM   #1
subyrail
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Default 2.0 wrx motor into sandrail (wiring help please)

Hey guys I picked up a motor out of a wrx with most of the harness from the front half of the car. I've got the motor in my sandrail and got all the exhaust. I/C pipes fabbed and all of that stuff. My main question is what all wiring am I going to need to make it run? I've started sorting out any emmissions related stuff and anything else on the ecu that I know I wont need. I did notice that the idiot I bought the motor from cut the wires right before the SMJ plug I have the 2 plugs and the wires though. Just curious if you guys would know some of what i'll need to just make the motor run (pump relay, pump controller, what wires, sensors) any help would be much appreciated!

I'm honestly not pos. on the year 02-04, I have an ext. walbro fuel pump on it, I'm putting gauges in it (autometer?) I've downloaded about any ecu pinout I can find but alot of them are different from each other or my wiring it seems like. If you need anymore info to help me out just let me know
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Old 09-14-2010, 02:22 AM   #2
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Can anyone tell me if I will need the factory fuel pump controller? Is there any way to identify what year my motor is and how different is the wiring from 02-04? Do I have to run the egt sensor and both 02 sensors? Thanks for any help guys oh and ps I'm not a total noob ha, I was on here about 5 years ago when I had a bugeye and when my old gf had a 04 wagon but I lost all of my log in info... if that helps at all... again thanks for any help
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Old 09-15-2010, 05:42 PM   #3
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I'm not sure if this is a complete list but this is what I know off hand.
You will need:
cam/crank position sensors
fuel injector signal/power
spark(coil pack) signal/power
Fuel pump (power travels through both the main and fuel pump relay)
Ignition
Power to the ECU(several of the pins)
Idle air control
MAF
O2 sensor(front one is most important.)

It will run without the EGT.
That is all I can think of.

As for the fuel pump controller, you do NOT even need it. When I was working on doing my WRX swap, I used 2 small pieces of wire to jump the connector for the controller, taking it entirely out of the system. All the controller does is lower the voltage to the fuel pump when it doesn't need full power.

-Yint
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Old 09-15-2010, 05:45 PM   #4
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Another quick note, the engine will be in Limp mode(rev limiter between 4 and 5 k) until you get the VSS wired in.
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Old 09-16-2010, 02:54 AM   #5
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Thank you for the reply! This is the kind of stuff Im a little lost on so this helps a lot! any idea on what I can do with the vss wire? and will I need to run the fuel pump on a boost sensor so it raises pressure with boost or anything or just a steady 12v? I'll have to post up some pics
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Old 09-16-2010, 10:17 AM   #6
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Some people use a steady 12V on the fuel pump. My understanding is that the fuel pump controller is just for fuel econ. If you do want to wire it in It is really easy, It has two power wires in(from fuse block/ground), two power wires out(to fuel pump), and two signal wires straight from the ECU.

If you are using a Subaru transmission, the VSS should be easy, again, it is a single signal wire from the VSS to the ECU (the VSS also needs +12 and ground)
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Old 09-16-2010, 12:51 PM   #7
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ok thanks for the help, I'm actually using a VW bug transmission though so I think im out of luck there haha I think I'll just start looking for a cheap aftermarket ecu. any suggestions on a simple EMS? Link? Ems? Utec? I REALLY appreciate your help man
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Old 09-16-2010, 01:37 PM   #8
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That's where my usefulness runs out, I have only ever used the stock Subaru ECU's.
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Old 09-16-2010, 08:25 PM   #9
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I appreciate all the help yint! So since I'm running a VW tranny is there anything I could do with the vss wire?
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Old 09-16-2010, 08:41 PM   #10
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http://www.smallcar.com/index.php?di...oduct_id=29880

Check the interface board also. Lots of parts here that you could use. Check outfront motors too.
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Old 09-16-2010, 09:07 PM   #11
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hey thanks for that link, mines a swing axle though so theres no rotating CV's that is an awesome website though, found a couple things I could probably use. Oh and outfront has exactly what I need but its out of my budget!
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Old 09-16-2010, 10:38 PM   #12
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[IMG][/IMG]

[IMG][/IMG]
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Old 09-17-2010, 08:03 AM   #13
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Sweet rail.
Hoping you had an irs, those are easy.
Here's another option that you can check out. not too spendy... They are helpful, contact them.

http://www.dakotadigital.com/index.c...rod/prd126.htm

Last edited by theotherguy; 09-17-2010 at 08:20 AM.
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Old 09-17-2010, 03:10 PM   #14
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I have actually custom made a vss signal before. I used a 2nd gen tranny in a first gen car, so I had to rig something up for the VSS. the signal is quite simple, the pin that goes into the ECU alternates between 5V and ground 4 times per revolution of the output shaft. I'm not sure what is on the VW tranny, but if it has anything for VSS built in, it is likely I could help you design a signal.
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Old 09-17-2010, 03:47 PM   #15
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This is a general photo of how to hack the VSS

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Old 09-17-2010, 06:54 PM   #16
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hmm looks tricky! haha I wonder if I could put it on the brakes somehow because on the vw swing axle the axle is in a tube so there is really nothing rotating to do like your picture
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Old 09-17-2010, 07:18 PM   #17
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Yeah, in a subie there is a small access whole in the tranny where the vss plugs in, and has all of that contained in a single small unit.

stock:


the sensor:
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Old 09-18-2010, 12:30 AM   #18
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Is there any other way to "trick" it or just turn it off? Maybe with tuning or something?
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Old 09-18-2010, 10:51 AM   #19
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It all depends on what you use for engine management, everything I have been saying was regarding the OEM ECU. as for the Utech or other engine management, I would go ask in the engine management section.
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Old 09-18-2010, 12:44 PM   #20
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ok, thanks for all the help yint. Is there anywhere to get the ecu pinout that tells what EVERY pin is? I have the one from the ursalia website and it seems to give the main engine control stuff but im just curious what the other wires are and if i'll need them. Is there a pinout for the smj plug also? I need to go do some more searching! thanks again
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Old 09-18-2010, 06:25 PM   #21
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Are you going to run any kind of speedo at all? Probably not but there are options out there if you decide to. I've also seen modified speedo cales connected to vss sensors and ran thru the dakota digital sg-1. A simple hall effect set up on your brakes would probably be the easiest and cheapest.
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Old 09-19-2010, 02:02 AM   #22
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I don't really need or want a speedo at all, just want it to run all out and not in limp mode!
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Old 09-19-2010, 03:18 AM   #23
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I don't really need or want a speedo at all, just want it to run all out and not in limp mode!
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Old 09-19-2010, 10:08 AM   #24
theotherguy
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epoxy magnets to the back of your disc brake hub and wire up a hall effect using yints diagram.

Example...

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Old 09-19-2010, 01:19 PM   #25
Yint
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^^ that is really the easiest way to do it if the tranny has no output port.


Good pic theotherguy!

What tranny are you using? model number? what car is it out of? Have any good pics of it?
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