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Old 05-11-2003, 10:49 PM   #1
01legacyOwn3r
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Default Converting Legacy 2.5 to STi

The new WRX STi is powered by a turbo 2.5 motor. Does anyone know the main differenced between the new STi's motor and the '00-'03 2.5, specifically the Legacy motor.

I have a feeling we will be seeing alot more of this conversion in the future.
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Old 05-12-2003, 12:21 AM   #2
Jerry Hong
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If you are just talking about the block itself, then the only difference is the semi-decking, and the thicker webs that hold the 2 halfs together. Its almost eh same as the block for any other 2.5. but the STi will have better pistons, maybe head...

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Old 05-12-2003, 04:46 AM   #3
Impreza01
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Er, lots of difference between the 2.5L n/a and STi 2.5.

For one thing, the 2.5 n/a is open deck and has a higher compression ratio. The STi 2.5 liter has sleeveless valves, AVCS, forged components like pistons and crank, better head, is DOHC, and the list goes on.
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Old 05-16-2003, 01:02 PM   #4
Oquipah
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Question

After estimating my monthly payments for a new WRX STi, I realized that perhaps a conversion of my 98 Legover would be more realistic. I had also wondered if a swap would be possible.

Being somewhat technically challenged, what do the responses above state? It sounds as you guys are saying it isn't possible.

I'd imagine that you would have to beef up or even swap out the tranny as well.

Any ideas on possible costs for a complete conversion? I have seen other totals at or around $10K.

Peace,
Oquipah
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Old 05-17-2003, 08:12 PM   #5
garface
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I'd say at least $10,000 for parts for the next few years. Then add labor to that.
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Old 05-18-2003, 06:46 PM   #6
01legacyOwn3r
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I got a quote on an STi crate motor for $7500 complete with tranny. I'm pretty sure that this is not an inexpensive conversion we're talking about on a Legacy. Unless you consider $8000+ affordable, I will continue to look for aftermarket turbos kits (pretty easy to find for about $4000).
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Old 05-19-2003, 05:34 AM   #7
JSiwek
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Was that crate motor a USDM 2.5 liter STI engine? There are plenty of JDM or Euro-Spec STI drivetrains (2 liter) going for about that price, but I haven't heard of any US spec ones yet. I would imagine that they are going to go for a whole lot of $$$ when the first US STI's start to become donor cars.

Labor for a swap runs about $2000, so it's definitely not cheap considering what you'll be spending for an STI drivetrain. It would, however, be very cool.

Jeremy
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Old 05-19-2003, 05:37 AM   #8
garface
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Quote:
Originally posted by JSiwek
Was that crate motor a USDM 2.5 liter STI engine?
Can't be, the tranny alone sells for $6,000 new.
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Old 05-20-2003, 07:01 AM   #9
JSiwek
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Yeah exactly. So we're kind of comparing apples to beavers on that one. Well, US apples to Japanese apples atleast.

To try and answer the original question: converting an N/A 2.5 into a turbo-charged STI 2.5 is not really possible. There are enough differences that it's essentially a different engine. You would be better off buying an STI engine and swapping it in, which, of course, would require a new ECU to run it.

Or, you could wait until the MY2005's come out... rumor has it that we'll be seeing an STI, twin turbo Legacy hit our shores.

Jeremy
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Old 05-21-2003, 06:00 PM   #10
monovich
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The swap is intriguing to me. I'll weigh wether or not to swap when the new Legover comes out. It would be a TON of work, but I'd just have i-speed do it.

I decide to swap, 10k isn't really bad at all considering I'd basically have a car with a whole new soul, and it's a LOT less expensive than a 30k Legacy, so I could certainly justify it. Not having car payments for another 3-5 years also means 3-5k saving in financing unless the 0% thing keeps up.

Of course, you'd really never be able to sell it for what you dump into it, but my car is so customized and personalized at this point, money is becoming less of a consideration.

It's a tough call.
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Old 05-24-2003, 05:17 AM   #11
JSiwek
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Quote:
Originally posted by monovich
and it's a LOT less expensive than a 30k Legacy, so I could certainly justify it.
If you're talking about that rumored STI Legacy, we can definitely expect it to be closer to $40,000! so.... go for the swap!

Jeremy
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Old 05-27-2003, 09:17 PM   #12
serious
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Not possible? My a$$! Anything is possible with the cash consideration. To get an sti full conversion you would spend a lot of money. You could do a partial conversion by just swapping out the block for an sti block and using your current heads. You can get an sti block 2.5 for 1300 from some dude in colorado. But with that you would only have half the parts for a real sti engine.
I'm in the process on swapping in a 02 wrx engine/transmission into my legacy. I have to go through the engine and possibly the transmission but should be in by the end of summer. If i have to replace enough stuff then i'll be buying one of the sti 2.5 blocks and use my wrx heads/intake/throttle body.
So with that in mind there are a lot of possibilitys. If my legacy isn't what i think it will be then i'll be trading in for a sti wrx or just wait it out for the new twin turbo legover.
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Old 07-19-2003, 02:30 AM   #13
Solomon
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Where would I look for a STI engine, and would I still have to use the STI Tranny?
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Old 07-19-2003, 05:20 PM   #14
serious
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You can find sti engines fairly regularly on ebay. They are overpriced there though. I would search around with importers like soko california or other places.
Brent
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