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Old 09-21-2003, 11:12 AM   #1
dandbest
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Default 99RS auto to WRX conversion questions

I have a 99RS auto (actually, my father's, but will be mine soon). I want to keep the auto, as it is strong, but want to put in the USDM WRX engine into it. What am I looking at? Im pretty sure I could source an engine with wiring harness for about $2000, but what else do I need? Is this gonna be a PIA or is it more or less a simple conversion? I want this car to be very very every day drivable. Basically, the plans are a basic Vishnu Stage 2 and call it a day. So, any suggestions?

Thanks
Danny
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Old 09-22-2003, 09:19 AM   #2
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Default Re: 99RS auto to WRX conversion questions

Quote:
Originally posted by dandbest
I have a 99RS auto (actually, my father's, but will be mine soon). I want to keep the auto, as it is strong, but want to put in the USDM WRX engine into it. What am I looking at? Im pretty sure I could source an engine with wiring harness for about $2000, but what else do I need? Is this gonna be a PIA or is it more or less a simple conversion? I want this car to be very very every day drivable. Basically, the plans are a basic Vishnu Stage 2 and call it a day. So, any suggestions?

Thanks
Danny
Found out that the WRX sub-Frame fits so you will need that. Also a 1999 rear limited slip rear end. The intercooler ducting will be a problem.
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Old 09-22-2003, 04:16 PM   #3
supermoose
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Default ?????

WRBLUEWAGON - what the heck are u talking about? did u reply to the wrong post? have u actually done one of these swaps before?

x-member.
ideally u run a legacy turbo or JDM GC8 wrx front subframe. if u know about stuff, there are issues with control arms, shimming, and what not if using the GDA front x-member.

why would intercooler ducting be a problem? remove the OEM hood scoop backing plate, and go buy a rubber bellows thing to fit a GC8 hood. MRT or sombody probbly makes one to fit bigger intercoolers, the GDA intercooler will fit just fine.

in 99 there were no LSD rear ends in 2.5 RS cars. LSD can be found probbly from forrester or outback or legacy auto, your 99gc8 auto is a 4.44 rear diff. u can run an open diff, the motor dosnt care. go check the post on rear diff gearing and LSD if u want an LSD

why dont u just make yourself a RS-T? u have a decent motor to turbo on , theres a million kits out there for cheap. the GDA wiring is a absolute no-fun job, doing a JDM EJ20 would be easier (im doing one myself so i actually know what im dealing with)
it would be plenty of fun and easy to do w/o much electronic skills.


yeah, unless u have some serious time and wiring skills, or a lot of $$$ to pay a shop, or a free GDA motor sitting around, just throw in a turbo kit and call it aday.
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Old 09-22-2003, 04:52 PM   #4
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I have a 4.44 LSD from an STi if you want it. garface98@aol.com
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Old 09-22-2003, 09:56 PM   #5
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Thanks guys. Now on the turbo kit suggestion- I really dont think it would be nearly as reliable or make as much power as say a USDM 2.0l with Vishnu Stage 2. As far as I know, on the 99 motor which is 9.7:1 compression, and is "supposed" to be the best RS motor (98-01) to turbocharge, you can still only run like 7psi of boost or else it goes south. My power goals are 250 at the wheels, so I really dont think that is feasible with the stock 2.5l. I also do know for a fact that the US 2.0l can handle that with ease, and will be reliable. Now for a JDM motor- I like that idea, but that is a bit out of my budget, but is the best option.

Thanks
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Old 09-22-2003, 11:21 PM   #6
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Hey, If I were you I would turbo the car and have tons of torque. I have done an EJ20 swap into a 94 Impreza that was an EJ18. If I had-had the EJ25 I would have turbo'd it. As of now the only car I have lost to has been a 2.5RS-T. I have beaten 2 WRX's a Camaro, a S2000, and several Mustangs. Once again I say I have only lost to a RS-T so I would turbo the engine you have. For the time and money comparisson of both. I would get a turbo kit and if you're really worried about the engine lasting, get lowered compression JE pistons and some engine mangement. This should still bring you in under the cost of them engine swap. I have a lot of hook-ups and did the wiring and install with one of my dad's mechanic friends and that is why I was able to do the swap for $4k. the time spent was about 50-60 hrs and I'm still working out some of the bugs. If you really wanted I read about a guy who did a new STI (2.5L) block swap into his (I believe) 99 RS.
Hope this helps, Micah
Just do a pro and con for both RS-T vs. WRX
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Old 09-22-2003, 11:36 PM   #7
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Default RST rocks

u want 250 WHP on a EJ205? so u talking what, 325 crank HP or so? i dont know what dyno/pack/ etc u are referancing to. as far as reliable power goes, nothing beats big-ness. im a doubter that a ej205 can do it really really reliabily and have thekinda powerband that a well done RS-t will have. a EJ257 shortblock is $1500 brand new at the parts counter if u are worried, and u can boost plenty on that. theres guys who have 250 whp easy on stock SOHC ej25 valvetrains/heads and forged internals on a phase II EJ25, go talk to kastle . i think hes got somthing like that.

yeha. for what u want (powerband / low end torque) leave your EJ25 in there and add some boost. u will probbly enjoy it much more than having the mad hassle of the ej205 converison, and then having to modify it for bonus $$$

h
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Old 09-22-2003, 11:46 PM   #8
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agreed....the one thing I miss is low end power. I have to wait for 3000 RPM's before anything really happens.
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Old 09-23-2003, 09:03 AM   #9
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Default Re: ?????

Quote:
Originally posted by supermoose
WRBLUEWAGON - what the heck are u talking about? did u reply to the wrong post? have u actually done one of these swaps before?

x-member.
ideally u run a legacy turbo or JDM GC8 wrx front subframe. if u know about stuff, there are issues with control arms, shimming, and what not if using the GDA front x-member.

why would intercooler ducting be a problem? remove the OEM hood scoop backing plate, and go buy a rubber bellows thing to fit a GC8 hood. MRT or sombody probbly makes one to fit bigger intercoolers, the GDA intercooler will fit just fine.

in 99 there were no LSD rear ends in 2.5 RS cars. LSD can be found probbly from forrester or outback or legacy auto, your 99gc8 auto is a 4.44 rear diff. u can run an open diff, the motor dosnt care. go check the post on rear diff gearing and LSD if u want an LSD

why dont u just make yourself a RS-T? u have a decent motor to turbo on , theres a million kits out there for cheap. the GDA wiring is a absolute no-fun job, doing a JDM EJ20 would be easier (im doing one myself so i actually know what im dealing with)
it would be plenty of fun and easy to do w/o much electronic skills.


yeah, unless u have some serious time and wiring skills, or a lot of $$$ to pay a shop, or a free GDA motor sitting around, just throw in a turbo kit and call it aday.
No I have not done a swap yet my self.

Sorry let me clear that up GC8 x-memeber or sub-frame and yes you can us the old gc8 intercooler but not a new USDM intercooler without some issues. The USDM is larger and angled diffrently.

Eric
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Old 09-23-2003, 11:33 AM   #10
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My 02 WRX engine and it intercoler fit in perfectly fine without any fitting issues. Yes I'm using an 01 RS hood as well.
Take it easy, Micah
I still would turbo it. You can buy my spare turbo kit for $1850(not enough power on an EJ18)
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Old 09-23-2003, 11:38 AM   #11
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Default Re: Re: ?????

Quote:
Originally posted by WRBLUEWAGON


you can us the old gc8 intercooler but not a new USDM intercooler without some issues. The USDM is larger and angled diffrently.

Eric
Where'd you get that gem of information from?

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Old 09-23-2003, 02:21 PM   #12
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seriously. ive seen a million GDA intercoolers in GC8's b4. ive even poked them with my finger !!! :P

h
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Old 09-23-2003, 08:42 PM   #13
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so you're the one who dented my intercooler fins jokin
take it easy, micah
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Old 09-23-2003, 09:19 PM   #14
dandbest
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Thanks to everyone for their input! Today I spoke to Rallispec, and parts and labor will run me $6k to do a USDM WRX conversion. The labor end alone will be $1800. Im positive I could find an engine, wiring harness, ecu, power steering hoses and pump and a legacy turbo cross member (or a gc8 wrx cross member) for under $4200. I guess I'd have to find a crashed WRX, but that can be done. The engine I could drop in my self (with the help of my friend who is a Subaru master tech) but I dont feel that I could do the wiring end of it. I guess I'll have to see if he wants any part of it, or else I'll have to pay someone to do it for me. On the other hand, to do the 2.5 the right way, I'd have to pull the engine, send it out to put better pistons, rods and generally rebuild it, then have the heads ported and some better cams put in, and then get a turbo kit. I see that as way more than $6k-- or at least I imagine it that way. To boot, I dont think it will be as reliable as the 2.0l for every day use. I had a WRX that had Vishnu stage 1 and put down 235whp/241tq on STOCK turbo, injectors, intercooler. So I know that the numbers Im looking for are very realistic, that shouldnt affect reliability any. Also, the way Im looking at it is the 99RS is like 300 or so pounds lighter than my WRX was, and I didnt think my WRX was laggy at all with the Stage 1, so that cant hurt either. Dont get me wrong, Id love to have a 2.5 turbo, I just cant afford it.

Again, thanks for the input!
Danny

PS- garface, your car looks very nice. I hope mine to look like that one day.
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Old 09-24-2003, 03:56 AM   #15
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Quote:
PS- garface, your car looks very nice. I hope mine to look like that one day.
Thanks. pm'd you.
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Old 09-24-2003, 05:53 AM   #16
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Default harness

im prettuy sure u could pay lachute or sombody $800 or somthing in that ballpark to make you a hybrid harness to fit the EJ205 in.

i suppose our definitions of reliable WHP are differnt. to each his own.

h
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Old 09-24-2003, 12:46 PM   #17
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Default homemadewrx's spare turbo kit

hey homemade im looking for a turbokit for an 99' 2.5 and i like your price so if u would like to work something out leave me a post or contact me cause i have about 2 grand to work with and i dont want to buy a new kit cause im low on $$$$$$$$$$$ but like i said i need a kit so let me know..........
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Old 09-24-2003, 10:11 PM   #18
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sent you a PM
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Old 09-25-2003, 11:13 AM   #19
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Default Re: Re: Re: ?????

Quote:
Originally posted by garface


Where'd you get that gem of information from?

I was talking in regards to sealing of the duct and IC with the GC8 Hood.
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Old 09-25-2003, 11:34 AM   #20
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rallispec sells the IC scoop seal thingy(really technical..brain fart).
So it's really not that hard not to mention anyone can make there own with a little time, sheetmetal and a little high temp foam (for sealing).
Take it easy, Micah
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