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Old 03-19-2009, 12:51 AM   #1
youngW03
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Default 2005 sti engine in 2003 wrx

would there be any way i can keep my 5 speed transmission and just swap out the engine with a 2005 sti engine, and get a new ecu or would i reflash my ecu. can any one take me through the steps or point me towards a thread that could tell me how to swap.
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Old 03-19-2009, 01:05 AM   #2
hybrid gti 2
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Yes. How, sorry I have no idea. I just know it's common to keep the 5mt. It's just a few wires. Surprised there is no post about this or sticky.
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Old 03-19-2009, 01:11 AM   #3
youngW03
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Quote:
Originally Posted by hybrid gti 2 View Post
Yes. How, sorry I have no idea. I just know it's common to keep the 5mt. It's just a few wires. Surprised there is no post about this or sticky.
dude i know i was totally wondering why there wasnt myself and ive heard of people doing it, and i want to do it i love my bug eye but i want more power haha
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Old 03-19-2009, 01:37 AM   #4
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Swap the transmission and keep your engine instead...you can easily reach/exceed STi power levels with the '02-'05 2.0L block.
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Old 03-19-2009, 01:39 AM   #5
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I'm interested in the answer as well.
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Old 03-19-2009, 01:47 AM   #6
youngW03
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swap the tranny huh, would you recommend like a tranny rebuild with ppg gears or sti gearing or what?
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Old 03-19-2009, 02:51 AM   #7
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just swap for the stock 6sp sti transmission... it can handle an obscene input. swap the trans, build the engine.

running a 5sp will hold up with turned up boost and higher input, but for how long... most likely (unless you never launch/drive hard on it) you will need trans work anyways.

tranny FTW!

http://forums.nasioc.com/forums/show....php?t=1717700

I assume some have seen this thread, this guy claims to be rolling with the stock trans.
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Old 03-19-2009, 03:23 AM   #8
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swapping the tranny and building the motor would be the way to go!
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Old 03-19-2009, 07:56 AM   #9
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Yup. You were looking at it all wrong. Swap the TRANNY from the STI NOT the motor. You could easily bolt on a vf39, get an exhaust and tune, and be quicker than any stock STI for a bout a grand.
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Old 03-19-2009, 08:27 AM   #10
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Old 03-19-2009, 09:34 AM   #11
hybrid gti 2
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^ videos makes me sleepy

ppg can do a lot more. I have 70k miles on my ppg. I have been known to get smoke off my tires.

Yet these guys are right. Unless you built the box 6mt would be a good choice.
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Old 03-19-2009, 09:51 AM   #12
emsmap
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Quote:
Originally Posted by hybrid gti 2 View Post
^ videos makes me sleepy

ppg can do a lot more. I have 70k miles on my ppg. I have been known to get smoke off my tires.

Yet these guys are right. Unless you built the box 6mt would be a good choice.
Thats when I first got them (still in breakin period) I have abused them quite a bit since then
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Old 03-19-2009, 10:27 AM   #13
hybrid gti 2
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thats more like it!
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Old 03-19-2009, 10:42 AM   #14
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I am interested in the original question. Many people know everything about transmission swaps. It's well documented. Everybody knows the advantages, etc.

But, back to the initial question: What if?
What if you don't have the money to do the right thing just yet (getting the 6 speed) and you get caught with the 5 speed at high mileage, say 160 k miles and your 2.0 dies, of spun bearing, by example..

You decide to immediately do a 2.5 and postpone the transmission, although WE ALL KNOW that's what you should do (transmission first).
This probably happens in real life. Each time you have some $, you go for more power. Untill, one day it's too late for your 2.0, BEFORE you had a chance to do a 6speed.

And here's my question:
How do you go about driving the AVCS in the 2.5? A reflash of the 2.0 ECU? I don't think so.
Without the AVCS, your 2.5 is more like a 2.3 (I'm just kidding, what I mean is that you're starting with less than 100% of what the Sti offers stock)
There's the throttle by wire, which requires a pedal, and probably running a wire to the engine compartment, etc.
OR you may run the 2.5 on cable throttle, I wonder if anyone did that, by using your old TB.
So, please, answer the original question.

Last edited by Vlad; 03-19-2009 at 10:54 AM.
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Old 03-19-2009, 08:49 PM   #15
suberdave
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read this.

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

i think this is what you are after... this is for the STI longblock not just the short block...

-=Suberdave=-
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