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Old 11-22-2004, 02:38 PM   #1
dunk
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Default 2003 WRX Motor into 2002 Forester

I'm planning on installing a 2003 WRX Motor into my 2002 Forester. Wondering if theres any issues I might overlook.

My one concern is that the Forester is an auto, will this make a big difference.

Extra parts that I will need. i couldn't find any threads that dealt with auto transmissions, or Foresters.

thanks

Duncan
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Old 11-22-2004, 11:19 PM   #2
Hyper
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search for any post that deal with older imprezas and legacies
same lego in the forester, you will need to figure out what ecu to use
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Old 11-23-2004, 05:23 AM   #3
dunk
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Just curious, because I couldn't find any information about it, what difference does it make which ECU I use.

Duncan
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Old 11-23-2004, 11:46 AM   #4
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the best path
sell 2002 forester
buy used 04 FXT

more power /warrenty and probblay cheeper
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Old 11-23-2004, 12:28 PM   #5
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The automatic transmission is going to give you issues. You will need to get an engine that came out of a WRX that had an AT as well as the harness and ECM.

Jaxx said it best. Sell it and get the XT, it comes with a warranty afterall.

Z
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Old 11-23-2004, 01:56 PM   #6
dunk
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What issues will I have with the auto. Couldn't find anything specific searching.

Duncan
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Old 11-23-2004, 02:25 PM   #7
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Subura parts lists the same part number for the auto and WRX ecu. I'm just curious, other than running the required signals from the ECU to TCU, what other additional issues would there be. Anybody with experience out there.

Duncan
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Old 11-23-2004, 03:03 PM   #8
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All right, looking at this a little closer.
Couple questions that need answering.
What is the differences between the WRX TCU and Forester 2002 TCU. I only have manuals right now for the WRX, still in research stage. On the WRX, there are only 8 wires that run from the TCU to the ECU. Assuming the Forester's TCU has the same outputs, can't I just run the wires from the existing harness into the WRX ecu?

Duncan
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Old 11-23-2004, 03:32 PM   #9
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Looking at my Wiring diagram which has both turbo and non turbo diagrams. I assume that the 2002 Forester TCU is the same unit as the 2002 RS ecu, and as such, here is the wiring path between the TCU and ECU on both turbo and non-turbo

TURBO TCU -> ECU
a3-b7 throttle position
a2-b9 throttle position
b17-c9 engine speed
c14-a18 Torque control 2 signal
c5-a19 Torque control 1 signal
b10-c14 Torque control cut signal
a1-b28 AT load signal
c21-b20 AT diagnosis input signal

NON-TURBO
b2-c17 throttle position
b1-c15 throttle position
b4-a30 engine speed
a21-b17 Torque control 2 signal
a13-b16 Torque control 1 signal
a2-a31 Torque control cut signal
b20-c11 AT load signal
a4-b4 AT diagnosis input signal

So it looks like the same signals are being shared between the TCU and RS ECU and TCU and WRX ecu.

-Duncan
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Old 11-23-2004, 04:34 PM   #10
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Looks like you answered your questions. You are still going to need a harness that is for auto WRX.

Z
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Old 11-23-2004, 07:00 PM   #11
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Well, I'm not sure, because the exisiting harness in the car now hooks the TCU to the harness. Couldn't I just cut the wires off and splice them into the manual harness?

Duncan
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Old 11-23-2004, 07:20 PM   #12
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hey hold on
you are making a good and important point

TCU in automatic WRX works in a different way then TCU in Forester as far as I am concerned (we should bug member legacy777 for this )
they are programmed differently, so you would need to get TCU as well, otherwise you might end up with one wheel drive car
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Old 11-23-2004, 07:28 PM   #13
dunk
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Actually I speed said that I could use the Forester TCU if I wanted, what I'm trying to figure out is the differences between the harnesses. Can you plug a WRX TCU into a Forester harness.

If so, I should be able to integrate the forester TCU harness into the WRX manual harness.

Duncan
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Old 11-23-2004, 07:54 PM   #14
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well being that there are 8 extra wires that you'll have to add to the harness if you use an MT harness it's going to get a little ugly. It would be far easier to match harness for harness.

Z
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Old 11-23-2004, 08:27 PM   #15
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Yes, but those 8 wires should be on the existing Forester harness. It's only 8 wires.

Duncan
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Old 11-23-2004, 08:45 PM   #16
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The pins on the plugs are completely different.

Z
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Old 11-23-2004, 09:32 PM   #17
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I still don't think we're communication on the same plane. I plan to use the Forester TCU, the plugs from the forester harness, cut the wires after the plugs, and then splice (solder) these wires into the WRX harness.

Duncan
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Old 11-28-2004, 04:17 PM   #18
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Anybody have any good sources on auto harnesses and TCU's. I've tried searching but have had no luck

Duncan
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