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Old 02-02-2007, 10:54 AM   #1
pzary3233
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Member#: 52841
Join Date: Jan 2004
Chapter/Region: South East
Location: Memphis, TN
Vehicle:
2002 WRX #14 STX
PSM

Default STI Swap Questions

I seem to really suck at this whole search function thing!

So I threw a rod in my Bug Eye WRX and now I am on the search for a new motor. Originally I was just going to throw together a new short block and call it a day. However I started getting some price checks on things and it seems to me that i can go with a newer '06 WRX motor for around 3700 or an STI motor for just about the same price. PLEASE don't tell me to go buy an STI as I don't want to have car payments and I have my car set up JUST the way I want it minus a StopTech BBK. Plus my car is paid for...

So I remembered that these motors are drive by wire, which I hate with a passion. is there a way to convert them to a mechanical throttle or do I have to adopt the drive by wire to my Bug Eye some how?

Besides AVCS will this swap be pretty much plug and play? With either motor I would have the complete engine harness and ECU.

Thanks for your time!
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Old 02-02-2007, 05:45 PM   #2
circaisdashiat
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Join Date: Sep 2005
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Location: Tucson, AZ
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1995 STi V5 replica
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If i were you i would buy an older STi engine. Or you can get a 2.5 or 2L block and build it up with some of the parts you already have
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Old 02-02-2007, 07:03 PM   #3
niemand_1
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Join Date: May 2005
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2004 VF30'd WRX
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I may be wrong so somebody please correct me if I am... but you should be able to drop an STi long block in without too much trouble. If you get a long block just swap over your intake manifold and throttle body off your WRX and away you go. I believe all the sensors should connect to your WRX harness no problem. Of course, by doing it this way you wont be able to use AVCS and will need to get a cam position sensor to fix that. As for what year longblocks you can drop in I am not sure. MY 2004-05 STi long block should work OK. I would be interested to know if 2006+ WRX long blocks would work like this as well. The 2006 WRX engines run a little higher CR (8.4:1 to be exact) and would make a nice little upgrade. Again I may be totally off on my info so please somebody correct me if I am.
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Old 02-02-2007, 08:42 PM   #4
pzary3233
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Join Date: Jan 2004
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Location: Memphis, TN
Vehicle:
2002 WRX #14 STX
PSM

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This is what Element Tuning had to say about the swap:

http://elementtuning.com/technical/ej25_install.htm

But I want a clean install that is factory. I don't want to have to go get a pro-tune as that would be a long drive for me on an un-tuned motor. If I can't replace it with a USDM STI motor I think that I would rather just build up my EJ205 and go that route.

There are kits to wire in the AVCS for the WRX so that isn't a problem.

I just don't want to have to deal with custom tuning because I had to use my stock WRX ECU on the USDM STI motor.

Basically what I want to do is NOT have drive by wire, but a physical connection between the gas pedal and the throttle body AND use the USDM STI ECU. That way it is a clean install without the need for custom tuning. Is this possible?

If not, do I have to hack into the harness a lot to incorporate the new gas pedal and Drive By Wire stuff?

Thanks!

Last edited by pzary3233; 02-02-2007 at 08:48 PM.
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Old 02-02-2007, 10:14 PM   #5
niemand_1
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Join Date: May 2005
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Vehicle:
2004 VF30'd WRX
JBP

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Honestly, it sounds like replacing your EJ205 is the way to go then. This will be the least expensive route and will not require you to get a tune. Any other way you go will either require alot of money or a professional tune. As far as I know there really is now way around the DBW system. If you dont want to use your WRX manifold and throttle body then you will need to get a DBW setup. Besides a wire harness and ECU I believe you will also need to do something with the gas pedal. Read through the conversions forum...there is alot of good info in some of the threads.
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Old 02-02-2007, 10:16 PM   #6
pzary3233
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Join Date: Jan 2004
Chapter/Region: South East
Location: Memphis, TN
Vehicle:
2002 WRX #14 STX
PSM

Default

I have been reading through them... If I could get an '06 WRX Motor I would be Extatic... I could stay in my Auto X class... No SM auto X class for me!
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