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Old 01-08-2005, 06:51 AM   #1
litebrite2001
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Default JDM STi Automatic Transmission

Does anyone have specs for a JDM STi Auto Tranny? I'm looking mostly for a wiring diagram. Power handling capabilities and quirks would be nice too. I'm hoping my uniqueness will pay off and I can use an aftermarket tranny controller like the one MSD offers to control it. I promise I'm not crazy. I'm sure someone saw this thing on ebay, and I was the only one dumb enough to buy it. Anything will help. Thanks.
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Old 01-09-2005, 03:01 PM   #2
GTScoob
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is it the sportshift model?

I know a lot of guys talk about wanting to swap in the sport-shift 4EAT but nobody really has bothered trying. I think it's probably the same as ours over here; possibly a beefier torque converter and clutchpacks.
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Old 01-09-2005, 10:48 PM   #3
Jaxx
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umm ...
no...
no there is no sti auto

the sport shift for the 2.5T is the same as the american one
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Old 01-09-2005, 10:51 PM   #4
garface
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There was never an automatic WRX STi. There may be a Legacy STi auto tranny, but you may have gotten scammed. I doubt there is much of a difference between that and a regular US auto. What did you pay?
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Old 01-10-2005, 12:28 AM   #5
dwx
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This is more than likely the auction:

http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

I have heard of an STI automatic transmission before from somewhere, I believe Ralyrcr on the board had one. I have no idea what kind of automatic it is though, this is very similar to the one he had, very old. Probably circa 96-97? I wouldn't be surprised if it's just a standard old 4EAT with the 90/10 split.

Whatever it is, it's a step down from a WRX transmission. So unless you are using this in some old Subaru, it's probably not worth much.
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Old 01-10-2005, 10:14 AM   #6
litebrite2001
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My gf is wanting to drive the rex and she can't drive standard. I probably did get scammed, but at least I have an auto tranny for her to use. I am 99% sure that this came off a 280hp EJ20 motor. That being said, is it truly weaker than the tranny's coupled to our 227hp motor? I've heard of the 5MT failing under stock conditions if you drive them too hard. I paid 350 shipped, which is probably way too much, but what can I do now? Does anyone have some electrical drawings so that the least I can do is try to make the best out of it?

Just so no one thinks I'm a wuss, I have an Automatic B18 CRX that I'm building as a track only drag car and the WRX is my daily driver with a TXS Stage 4 and a 75 shot.
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Old 01-10-2005, 11:26 AM   #7
GTScoob
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An auto swap is going to be a lot harder than a manual swap into an automatic car.

You might as well go with a new wiring harness for that transmission because I doubt you will be able to splice any of the old wires together. You would probably be better off returning you car to stock and trading it in on a 4EAT rex.
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Old 01-10-2005, 11:42 AM   #8
Jaxx
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don't do this ...
put the tranny back on ebay
and sell your car and buy an auto
this is just a bad idea
don't make it worse by destroying the car

it more than likely came off an early 90s legacy RS ~ 220 hp
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Old 01-10-2005, 12:04 PM   #9
garface
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That's actually not a bad price at all, though the mileage is a bit high. If you do decide to do this, I have a TCU and TCU harness that you might want. PM me if you're interested. Thanks.
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Old 01-10-2005, 12:31 PM   #10
dwx
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As painful as this may be, teaching her to drive stick may be less painful than swapping an automatic into a manual WRX.
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Old 01-10-2005, 03:27 PM   #11
litebrite2001
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I don't really want to trade in the one I got. What are the chances of the tranny bolting in place, and what kind of engine management differences will need to be made. A rev limiter for WOT shifts should take care of a lot. Its easy enough to wire in a Neutral/Park limit switch to disable starting. An EJ20 should be set up to easily transfer between a auto and manual. I will need to find the taps for the hydraulic lines, but the shop manuals can give me that. I've done this in a few older cars, Mustang GT to GTA conversion, but none used electronics. They use a detent off of the carb to move shift points to higher RPM's at WOT. My biggest concern is how to control the shift solenoid as I don't know much about Subaru. I know I'm not an expert mechanic. 99% of my car experience was out of necessity not for pleasure. Thanks everyone for looking out for me, but I'd really like to tackle this one if it is possible without a lot of cutting and welding.
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Old 01-10-2005, 03:37 PM   #12
garface
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It will bolt on, but you will need an AT driveshaft and rear differential. What you need to control the tranny is the TCU or transmission control unit. I have one for sale along with the harness that connects to it. I also have the automatic shifter and linkage as well as the brake pedal assembly. Just let me know if you want any of these items. garface98@aol.com or pm me.
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Old 01-11-2005, 06:29 AM   #13
litebrite2001
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Now comes the stupid question... Why would I only change one differential? Where would the difference come from between the front and rear? In the center diff? Or is there actually some internal gearing in the tranny that puts out two different speeds between the front and rear? I am not being sarcastic, I am truly having trouble picturing this. On a 4WD, I would have a transfer case, and the front and rear driveshafts spin at the same speed, so if you change one diff, and don't change the other, the first time you engage 4WD, BOOM.

I could have a driveshaft fabbed locally, and would probably go strong enough to do a future RWD conversion, but that's a whole 'nother project.
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Old 01-11-2005, 09:08 AM   #14
garface
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MY01 RS Both Silverthorne

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The front and center diff are in the tranny. So the only diff you haven't changed yet is the rear, and you have to do it otherwise, then comes the boom.
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