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Old 09-28-2001, 04:47 PM   #1
RS2000
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Default STI engine swap questions

I have a 2000 RS and am thinking about swapping in an STI motor. If I can get my hands on the motor, trans., ECU and a wiring diagram for it. What other kind of costs besides installation am I looking at? What has to be done to be able to run the engine on 93 octane besides adding a can of octane booster to every tank? What are some problems I may run into? Any info you could give me would be greatly appreciated. Thanks.
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Old 09-28-2001, 05:07 PM   #2
wac
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Perhaps this can help get you started:
http://www.demeis.com/motorsport/hardware/wrxstory.html

-WaC
Wayne
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Old 09-28-2001, 05:39 PM   #3
SubaFastR
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Make sure you get the cross member, and be prepaired to change the whole wiring harness to use in the Left hand drive car!
K
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Old 10-01-2001, 10:31 PM   #4
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Searching sucks. Be nice. You can answer a question just as easily as telling one to search. I think it's good to ask fresh. You get new and more educated answers.
Kevin
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Old 10-01-2001, 11:39 PM   #5
RS2000
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I already did a search and didn't get many clear answers, so I'm asking again. OK, if I do the swap I'm going to get a tec II so the wiring isn't as much of a headache and I have more control. So my origianl questions still stand with this addition to it. Thanks.
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Old 10-02-2001, 12:26 AM   #6
NateDogg
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bigger brakes, better diff's and a lot of time. this is the kinda thing i would pay someone to do and im a huge do it yourself kinda person.

Nate
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Old 10-02-2001, 12:39 AM   #7
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Default how much?

wil it cost to get a engine/tranny and all installed. I live in orlando florida. any info is appreciated.
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Old 10-02-2001, 10:41 AM   #8
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RS2000: It's all there in the archives, everything you need to know. If you're serious about doing a swap, I highly recommend you learn how to search. But, I will give you a quick summary:

1. What kind of car do you have? This will determine what kind of parts you need. People with RSs typically just replace the engine and tranny. Those with older cars might do a full drivetrain swap. I prefer the idea of a full swap: engine, tranny, suspension, brakes, diffs. etc. If you're dropping in a monster engine, it's a good idea to have brakes and suspension to match.

2. ECU and wiring harness: The harness is the biggest obstacle. They are hard to find complete. When a harness is removed from a wreck, it usually gets all cut up. Re-wiring a partial harness is a nightmare, lots of trouble. If you don't get an ECU, an aftermarket engine management system can be installed with it's own engine wiring harness and save a lot of trouble. But you'll still need to wire the rest of the car. Link and TEC-II are good stand alone systems.

3. Sourcing parts: Try to get as complete a set-up as possible. If you buy just an engine and tranny, you'll be paying for lots of little parts later. Be careful when buying, pick a shop you trust. When these engines take frontal hits, they tend to snap timing belts and you end up with damaged valves and possibly pistons. Buy from someone who will support you after the fact, and who has a good reputation. If you buy from some fly-by night guy you MIGHT get a good engine and a good deal, but you might also get screwed. I've heard of someone who bought from a reputable shop and still got a damaged engine. But the shop took care of him...

4. Prepare for a lot of time - The job, if you get it done by a shop, will take time, more time than you think it will. If you do it yourself...well you'd need a nice garage, tools, a little help, and you'd better have mechanical know-how. And several months, unless you're working on it every day.

That's a quick summary. If you do this, the best advice I can give you is be patient and find a good drivetrain. If you have a clean, low KM drivetrain, your other problems won't seem as bad because there will always be light at the end of the tunnel.

It's a matter of opinion, but RA's and Type R's have a super short ratio gear box. Annoying on the highway but for acceleration it can't be beat.

And finally, cost. Hard to speculate. Buy a cheap mid 90s WRX engine and you'll save bucks. Buy a late model STi and it'll cost a lot more. It all depends on how much you want to pay. IMO, the best combo would be a sunroof-less early model Impreza plus an STi drivetrain. No need for an RS since you'd be replacing all the expensive bits anyway. With a cheap early Impreza and a V.3-4 full drivetrain, I think you could squeak by for about 15K US. Maybe a little more.
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Old 10-02-2001, 01:50 PM   #9
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The Link can only be used with the stock wiring harness. You literally open up the ecu box, take out the ecu, and screw in the Link ecu. Excellent choice if you get the wiring harness.
Kevin
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Old 10-02-2001, 03:58 PM   #10
RS2000
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Well I might have a lead on a Type R engine, trans. and ecu. They are checking on diffs. for me though. Could i get away without getting diffs. right away? Or am I just asking for trouble?
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Old 10-02-2001, 04:03 PM   #11
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Oh by the way, Maximum I know how to work the search, I've spent a good portion of the last few days reading posts about this but most of the newer posts just say do a search. If more peope would take the time to answer the questions instead of just saying "do a search" maybe we would have some new info, maybe someone found something that works even better or found a way around something, but we would never know because people just say do a search. I appreciate the info I've gotten so far from you guys. Keep it coming. Thanks again.
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Old 10-02-2001, 04:13 PM   #12
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You already have a LSD. You shouldn't need the drivetrain.
Kevin
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Old 10-02-2001, 04:18 PM   #13
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Oh, i forgot to mention, brakes and suspension are already done.
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Old 10-02-2001, 04:41 PM   #14
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You can get away with your current lsd.. but the ratios on the STi are different than on the RS. RS has a 4.11, whereas the STi's are 4.44. You'll have to change the ring and pinion on your current rear differential to match.

Good luck! STi swaps require that you have a wheelbarrow overloaded with cash to complete. I stopped keeping track of what mine is costing me.. too scary!
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Old 10-02-2001, 07:37 PM   #15
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Well I can tell you that after doing more then 8 SR20DET motor swaps into 180's or Silvia's that doing those or even converting a low end Familia to a turbo AWD is actually easier then swapping motors when dealing with Subaru. We put a STI motor into a older Legacy a while back and even that turned into a pain in the ass. To be honest I wouldn't even try it myself. If I had the money to blow I would have a shop do it for you. Also keep in mind that Subaru used alot of different coil packs. It depends on the year and model of car you got the EJ20 out of.
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Old 10-02-2001, 07:52 PM   #16
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I plan on having a shop do the install. Its too much work and too time consuming for me to do it. Now, I just need another car to use while mine is in the shop.
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Old 10-03-2001, 02:09 AM   #17
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If you end up getting an older WRX engine, i can get you for around $1000 or so.
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Old 06-04-2003, 04:23 PM   #18
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I can't believe this thread was listed in the FAQ! Here is the ultimate answer to the swap question, get the entire clip, or don't bother. If you have a virgin wiring harness, you can do this swap easily, as long as you can read the wiring diagram. The wiring diagram book from Subaru is about $27. Once you have the diagrams from the jdm setup, it is just a matter of matching the appropriate wires to the dash.
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Old 06-04-2003, 11:13 PM   #19
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As far as I know STi engines have variable valve technology similar to VTEC in Hondas. A stock STi computer knows how to controll them, but do aftermarket ECU's s.a. Link know ?
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Old 06-05-2003, 09:38 PM   #20
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Most aftermarket ECUs have extra drives for things such as V-tec (I know the Link does), but how complicated is the subaru variable valve train. If it's a simple on and off then it would not be a problem. If it has a few different positions then it could get hairy.
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Old 06-06-2003, 03:14 AM   #21
SubaFastR
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It is full open, or full closed. Unfortunately, V-Techs are simple on off switches, while the tumble valve's switch gives motors power for a set time. At Ziel Motorsports, we simply locked them open when installing the DTA engine management system. It is merely a smog device for idle air emisions.
Kevin
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Old 06-06-2003, 06:10 AM   #22
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subarus variable valve timing is NOT on or off, it is VARIABLE.

the valve timing and the tumble generators are two different things.
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Old 06-06-2003, 10:03 AM   #23
SubaFastR
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Quote:
Originally posted by kaos200
subarus variable valve timing is NOT on or off, it is VARIABLE.

the valve timing and the tumble generators are two different things.
That would be why I said tumble valve.
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Old 06-09-2003, 02:00 AM   #24
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but he wasnt asking about that
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Old 06-15-2003, 01:40 PM   #25
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What you will need is for Rallispec to get the parts for you and if you do not know how, for them to install it as well. In all, I spent well over 7K to get an STI motor running in my car, and that is not including labor.you will need
Motor, tranny, clutch, flywheel, slave cylinder, airbox/maf, I/C, ECU, DP, WRX front crossmember, WRX front sway bar, Driveshafts half shaft, rear diff, Walbro or WRX fuel pump, wiring harness, WRX radiator with custom bracket to fit the GC model car ( WRX radiator is twice as thick as the RS)

To save a lot of money, use you stock RS tranny till you break the gears, but it won't, as long as you do not dump on the clutch. Keep in mind, the RS tranny is a push type clutch and the WRX is a Pull type, even for the JDM WRX's. So, if you decide to keep the RS tranny in there you could save on the tranny,slave cylinder,clutch/flywheel,rear diff, half shafts, etc.

The wiring harness is the hardest part of the conversion. FYI- Rallispec charges $750 just for the wiring swap, it's $1250 if they have to pull the harness out of the car (which is a very decent price). To remove the entire wiring harness out of the car/ front dash, you will have to remove the ENTIRE dash, heater core, and move the A/C core. I would say there is about a good 20-30 lbs of wires.
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