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Old 05-09-2005, 11:39 AM   #1
swift2fly
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Default '04 WRX to '05 USDM STI conversion

gonna convert my 04 wrx into a '05 STI..minus exterior. what do you guys think? after 32000miles my EJ20 finally witnessed a broken valve and who knows what else i damaged while driving on it looking for a good batch of gas..thinking it was knockin. i'm done with messing with the wrx drivetrain. my car is a lil over a year old and i already witnessed issues with the tranny, clutch and engine. i want something a little more reliable. so to avoid reverting it back to stock and then repairing the current motor and then trying to cough up cash for a down payment for a beefier car like an EVO or sti...i thought why not do a complete STI conversion. it would also help with insurance too. thoughts?
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Last edited by swift2fly; 05-09-2005 at 12:24 PM.
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Old 05-09-2005, 12:00 PM   #2
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the usdm sti? or the jdm v7?
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Old 05-09-2005, 12:05 PM   #3
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'05 sti USDM. this will be a full complete swap...engine, tranny, suspension, interior etc.
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Old 05-09-2005, 03:11 PM   #4
2000 RSTi
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just be aware that if the car were to be stolen everythign you have done will not be covered because its still a WRX
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Old 05-09-2005, 03:11 PM   #5
2000 RSTi
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and also for the amount of the motor tranny and everything else would be close to an STi's price
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Old 05-10-2005, 12:59 PM   #6
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Quote:
Originally Posted by 2000 RSTi
and also for the amount of the motor tranny and everything else would be close to an STi's price

STi should be ALOT cheaper. The 6 speed alone puts you up to the STi's price when adding to a new WRX's MSRP.
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Old 05-10-2005, 01:26 PM   #7
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On an 04 car? Sounds like a terrible idea.
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Old 05-10-2005, 01:43 PM   #8
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Do you plan on keeping the car forever? If so, do it!
Although I know a guy who is selling a rolling shell of an 02 black wrx for cheap. It would be better for you to sell your ride, buy the shell and work off that.
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Old 05-10-2005, 02:15 PM   #9
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i just bought my WRX 7 weeks ago (had 26,500 when got it). I had a legacy and I said the same thing about the legacy...I planned for a swap and all but at that price it wasn't worth it, so I sold the car and bought a wrx because had a better base to start out with.

i'll go through the same process as i did with the legacy and you... i want more reliable blah blah

but that is where the difference between an NA legacy to a swap and a WRX comes

the WRX can get worked on without a swap and put out as much HP and function again.

do some internals, get a new trans and get back on your feet... just compare that with the swap... see which is less expensive

down the road i'm just going to play catch up with internals like the legacy for the next 4 years. ill perhaps look at cars or swap choice all over again

but a low milage car like you, i'd say just upgrade with better WRX parts
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Old 05-10-2005, 02:33 PM   #10
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Doesn’t sound like the most cost effective approach. You’ll pay more and still have an inferior vehicle to a OEM sti. You figure 10k (minimum) for the drivetrain installed on a 16k car, and you’ve totaled more than the amount necessary to buy a sweet low-miles STI. Have you given any thought to the wiring job which would necessary to integrate over the sti ECU and DCCD?

You could always throw a sti shortblock and maybe some RA gears in your existing setup and be happy for few more years to come…

Good luck..
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Old 05-10-2005, 02:44 PM   #11
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Quote:
Originally Posted by 2000 RSTi
just be aware that if the car were to be stolen everythign you have done will not be covered because its still a WRX
Most if not all insurance companies will cover any aftermarket part installed in a factory location (ie: something bolted in where the factory would put it, so a sub in the trunk isn't) as long as you retain receipts.


Brian

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Old 05-10-2005, 02:47 PM   #12
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Quote:
Originally Posted by xcntrk75
You could always throw a sti shortblock and maybe some RA gears in your existing setup and be happy for few more years to come…

Good luck..
EXACTLY you can still have the HP of an STI also. Do pistons, and turbo also. You'll be happy with the way it moves... as for the trans, short shifter (if haven't), good clutch, the sti mounts, and the gears.


its less than an STI just as much power to an stock sti and you brought your rex back to life... i mean its your WRX, its tough letting go. I had a hard time with my legacy
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Old 05-10-2005, 03:09 PM   #13
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Quote:
Originally Posted by North Ursalia
Most if not all insurance companies will cover any aftermarket part installed in a factory location (ie: something bolted in where the factory would put it, so a sub in the trunk isn't) as long as you retain receipts.


Brian

The problem with that though, is that an STi engine costs you lets say $5000 to buy and install. Then you sell your stock engine for say $1000. When your car gets stolen, the stock engine is probably valued at the same amount as the STi engine. So is the insurance co really going to care? Same with any other part. Am I thinking about this correctly?
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Old 05-10-2005, 03:15 PM   #14
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Quote:
Originally Posted by garface
The problem with that though, is that an STi engine costs you lets say $5000 to buy and install. Then you sell your stock engine for say $1000. When your car gets stolen, the stock engine is probably valued at the same amount as the STi engine. So is the insurance co really going to care? Same with any other part. Am I thinking about this correctly?
Yup, i got shafted out of 30k in mods when my car was stolen and totaled.. I went to my INS a month before telling them i wanted to pay for extra ins, and they told me that it wasnt needed, all i had to do is provide reciepts, and let them take updated pics of the mods.. Gave him my reciepts, ccopied them filed them, took pics of the car and said i was set.. When it came time to pay up, my ins co, was like "no way we are paing you 50k for a wrx" and tried to give me 15k
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Old 05-10-2005, 03:33 PM   #15
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I second the EJ257 shortblock and gearset.
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Old 05-10-2005, 03:52 PM   #16
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Cronic,
What happened or has there been a conclusion to the situation?
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Old 05-10-2005, 04:03 PM   #17
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Just to let you know if you do a STi swpa be prepared to either get a STi tranny or a RA gear set cause you will destroy your factory tranny.
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Old 05-10-2005, 04:44 PM   #18
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Quote:
Originally Posted by 2000 RSTi
Just to let you know if you do a STi swpa be prepared to either get a STi tranny or a RA gear set cause you will destroy your factory tranny.
Absolutely not true. 18,000 miles and 301whp later, my stock TS tranny is fine.
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Old 05-10-2005, 05:42 PM   #19
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its all on how you take care of the car.

The hybrid engine REALLY moves.
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Old 05-10-2005, 07:18 PM   #20
2000 RSTi
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wow... I know most people that have done STi swaps have destroyed their tranny's by keeping it stock...
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Old 05-10-2005, 07:55 PM   #21
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"most people" also say the stock WRX tranny and clutch are weak and useless.

4 years and 51,000 miles on my stock WRX tranny/clutch, 1 rallycross season, lots of spirited driving, some good launches, much of this time under a UTEC stage 2 setup, and the stock stuff drives like new.
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Old 05-11-2005, 12:16 AM   #22
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yeah that swap sounds like a idea. it would be more cost effective if you did a jdm v7/v8 swap...
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Old 05-11-2005, 12:46 AM   #23
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as for the stock tranny, the biggest problem I see is people comeing from 2wd or lower powered awd cars don't realise you simply can't launch a WRX the same way. It takes finesse, don't dump the clutch. on 2wd cars the tires generaly break loose before the tranny breaks, awd has twice the traction on launch so the drive train takes twice as much torque before it chirps the tires, if you are barking all four tires you're likely to break the 5mt tranny. even if your not launching that hard you have to be aware of how much stress your're putting on it. It sounds to me like the OP was putting some hard miles on his WRX to make it give up the ghost after 32k. The 5mt is not so much weak as the EJ20 is strong. the 5mt is fine for the eariler cars it was designed for and sufficent for light to medium driveing with the EJ20 (otherwise Subaru woulden't have used it) but if your hard on your car it will break, especially with AWD.
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Old 05-11-2005, 12:47 AM   #24
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yea i took some options into consideration...i was dreaming about a swap. i'm just going to get the same block and drop in forged internals. just gonna keep it cost efficient and still be able to push more out of it. thanks for the help guys.
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Old 05-11-2005, 12:54 AM   #25
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if you check ou IA performance you can get a short block for the same price as that stuff....just a idea.
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