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Old 01-25-2005, 09:12 PM   #1
blueslsti
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Default 93 Impreza wagon STi conversion questions

Hey Guys,
So I'm assuming these questions I'm about to ask have been asked numerous times. I'm about to get a 93 AWD 1.8L Impreza Wagon with high mileage (over 200K). It is a 5-speed and in excellent condition. I also have a fully built USDM 04 STI engine, 6-speed tranny with the DCCD, and finally STi brakes. I was planning on swapping it into my 94 Legacy wagon, but two weeks before the swap was going to happen I totalled it... Someone pulled out in front of me when I was going 50 mph. But that's a different story... Since my Legacy was totalled, I have decided to buy an Impreza. Now here are my questions...

Car Itself:
Would it be worth it if the Impreza has around 240K? The guy wants $1500 for it. The body is in perfect condition (besides faded paint on the hood). The interior is in great condtion... the only thing I could find wrong was the driver seat had a hole.

Engine:
Is it possilbe to fit the STi engine into my little underpowered Impreza Wagon? Will I need to modify it? What other parts might I need?

Tranny:
Will this fit into the Impreza? Will I need to modify anything? What other parts might I need?

Brakes:
Will these fit the Impreza? How much will I need to modify? What other parts might I need (besides 17s)?

Thanx In Advance For Your Help and Knowledge!!!

-Jon-

P.S. Consider me a newbie... Meaning if you have time, describe in detail please...
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Last edited by blueslsti; 01-25-2005 at 09:53 PM.
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Old 01-25-2005, 09:23 PM   #2
Jaxx
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cool project

engine:no prob you will need a crossmember .. get a legacy turbo version

tranny: yup there has been mumbelings that you need to slightly massage the tunnel but yes it will fit

brakes: which rear diff are you going to use? do you have the rear brembos?
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Old 01-25-2005, 09:25 PM   #3
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Brakes: I dunno about the rear diff... I know it's whatever the stock one is on the 04 STI. I do have the rear brembos.
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Old 01-25-2005, 09:49 PM   #4
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It will all fit. No need to massage the tunnel either. You'll need the pedal box and all of the associated clutch hardware out of the STi. The main reason you'll need the pedal box is that the STi engine is throttle by wire. You will also need the entire wiring harness for the car. Front, Bulkhead and Rear.

Z
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Old 01-25-2005, 11:47 PM   #5
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For the brakes, you'll also need to replace some parts of the rear assembly besides just the physical calipers(I doubt the 93 came with rear discs). I think you'll need to replace the hubs and halfshafts as well. I'd do a search specifically on the STi rear brake swap into an older body style. There have been a few write-ups on that. Some of the WRX info carries over, but I'm not sure what differences there are as far as parts that may or may not need to be replaced in the different configs.

The trick to searching for this stuff is to do separate searches for each specific issue. No one posts on how to do everything for an entire swap. You'll see posts on the physical engine swap, separate ones on the tranny info, separate ones on the brake swaps, separate ones on the tranny swap, suspensions, etc...
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Old 01-26-2005, 10:51 AM   #6
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charge is right on ..
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Old 01-26-2005, 11:47 AM   #7
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I'm not too sure how much help I can be.. I've got a similar setup as you... 93 impreza, STI motor.

As far as brakes go, I'm running 4 pots up front, and wrx discs in the back (upgarded from drums). Some people will try to tell you that you have to upgrade the master cylinder, but I didn't. The pedal feel isn't all that great, but still very functional. I'm guessing upgrading the MC might be necessary for the beefier Brembo's though... if you can get your hands on the 04 MC, (assuming it fits) it would probably be in your best interest to do so.

Start thinking about upgrading to the 97+ headlights, hood and grill as well. You'll be hard pressed to find a pre 97 hood with a scoop in it. Unless of course you're going to go with a FMIC.

Curious to know:

Is your 93 AWD?
Auto or 5spd?
Do you have the rear diff from the USDM STI?

Jason.
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Old 01-26-2005, 02:06 PM   #8
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That is the perfect car!

Does your USDM STi engine include intake manifold and ECU harness and ECU? you need those to run your STi motor. IF not you have to find yourself a difference intake manifold and its sensors with ECU and harness.

You need a rear diff because the L runs 3.900, STi runs a 3.54 or something to that. This would mean new half-shafts front and rear maybe.

What do you have altogether? List them and then we can help you put in the missing parts you need.
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Old 01-26-2005, 02:44 PM   #9
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$1,500 still sounds a little steep for 240k miles. See if you can talk him down at all.
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Old 01-26-2005, 02:50 PM   #10
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you'll need to change the rear ratio to what the front has, no need for half shafts. you are using the sti tranny correct(the front is 3.54:1?)? so the rear is in need of change(to 3.54:1). your axles will withstand about that power level, you're gonna find out how close to the limit you are very soon! i'm doin the sti2.5 short block swap into my MY98 OBS. i just need the 6spd(jdm or usdm) to complete. i'm gonna do brakes at the same time, but i'm not willing to spend the $ on a new driveshaft and half shafts all around(to convert to wrx/sti drivetrain). i'll break what i got for now! L8
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Old 01-26-2005, 04:22 PM   #11
FuJi K
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The front runs a 3.9, the transfer gear steps it up 1.1:1 I think that's why you need to run a 3.54 in the rear.
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Old 01-26-2005, 04:47 PM   #12
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bzzztt
3.90 from 3.90 rear in the usdm 6 speed
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Old 01-26-2005, 04:55 PM   #13
blueslsti
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Quote:
Originally Posted by FederalAuditor
Start thinking about upgrading to the 97+ headlights, hood and grill as well. You'll be hard pressed to find a pre 97 hood with a scoop in it. Unless of course you're going to go with a FMIC.

Curious to know:

Is your 93 AWD?
Auto or 5spd?
Do you have the rear diff from the USDM STI?

Jason.
I was definitely starting to look for the new style headlights, hood, and grill. I was also wanting to do the RS front bumper conversion. I'm planning on doing just a top mount for now.

The 93 is AWD
5-speed
Not sure... A friend has the whole setup for me right now (I'll ask him though)
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Old 01-26-2005, 04:57 PM   #14
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Quote:
Originally Posted by FuJi K
What do you have altogether? List them and then we can help you put in the missing parts you need.
Um, I'll ask my friend as he is the one with all my stuff. I just know he told me he has the whole engine and the 6-speed tranny. I will get back to you though when I know EXACTLY what he has for me.
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Old 01-26-2005, 04:58 PM   #15
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Quote:
Originally Posted by americanyouth
$1,500 still sounds a little steep for 240k miles. See if you can talk him down at all.
How much would you pay for a Impreza Wagon with that many miles?
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Old 01-27-2005, 12:09 AM   #16
jamesfacts
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Probably around $1000.
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Old 01-27-2005, 02:49 PM   #17
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If this helps, remember the early Impreza is nothing more than a short Legacy. Everything off or that fits a Legacy will fit your Impreza. There are blind bolt holes and studs for every suspension and engine mounting points.

Wriing for the new motor is related by heritage only. The connectors, layout, pin locations, etc., are all different. I do think it is possible to use the rear early Impreza harness with some changes to splice in the newer STi harness. I really hope so because that is the point I am at with my current conversion. If possible, I would rather not switch all the rear light and brake wiring. That would mean changing connectors AFAIK. Big project by itself. Best of luck.

Mike McBride - MY93 currently EJ20G, converting to ver 8 STi with cable throttle.
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Old 01-28-2005, 02:04 AM   #18
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John... with my swap I found it easier in the end just go use a hydra and WRX throttle body. I've also got a COMPLETE brake (even have an MC and booster) setup from my '98 RS minus the rear hubs.... I would highly recomend going to the R180 rear end if you can.
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Old 01-28-2005, 01:40 PM   #19
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Quote:
Originally Posted by MZM
I do think it is possible to use the rear early Impreza harness with some changes to splice in the newer STi harness.
That's what I did with mine... you should be okay.
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Old 02-05-2005, 02:37 PM   #20
FuJi K
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Quote:
Originally Posted by FuJi K
The front runs a 3.9, the transfer gear steps it up 1.1:1 I think that's why you need to run a 3.54 in the rear.
...as I quote myself.....
I'm not REALLY SURE what the rear diff ratio is on the STi. Because the WHOLE tranny is different from the WRX tranny 6spd vs 5spd. So I'm not sure if it HAS a step up gear or not. A friend (PHATSuby) has a STi 6spd in his MY01 Leggy and says that the rear is a 3.900, not a 3.54

EDIT:
Well, in fact, the STi DOES have a 3.9 rear diff ratio
as quoted from this thread CLICK HERE scroll down to where it tells you the cost
3.636 (1st) 2.375 (2nd) 1.761 (3rd) 1.346 (4th) 0.971 (5th) 0.756 (6th) STi (USDM) FD 3.90
(Front 3.90 center 1.0 rear 3.90)


.....You should be just fine with your stock 3.9 rear diff. You just need an auto WRX driveshaft. I don't know if the auto RS/TS has the same length driveshaft or not.

Last edited by FuJi K; 02-05-2005 at 03:03 PM.
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