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Old 03-27-2006, 06:17 AM   #1
ozsooby
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Exclamation Difference between EJ20T and EJ20TT???

Hi, I'm starting this thread with the hope of getting some PROPER answers.

I have a 97 legacy non turbo (Australian Model), and want to convert it to a turbo. I am not sure of what to get with performance in mind. I was told that although a Legacy Twin Turbo is still an EJ20, it doesn't produce as much power, and can't be tuned as well as a Single Turbo WRX EJ20. Does anyone know if this is true??? Stock standard, will a WRX engine have a faster 0-60 time, for example, than a stock standard Legacy engine??? Are the actual internals the same??? Is it as simple as different set-ups??? Please help!!!

I have the money, however, it's very hard to find a WRX EJ20T in Australia, I can find Legacy EJ20TT's, but don't want to spend the money, if a WRX is much better.
I can possibly import a WRX engine from Japan, but that costs more money and time. So here's my dilemna, do i get the Legacy or spend more and import a WRX engine?? Is it worth it???

Also, is it hard/expensive to convert a Legacy TT to a Single Turbo? Will I need to replace the ECU aswell???

If anyone can answers these q's I'd be extremely grateful as I currently have several people trying to sell me Legacy engines, but I am worried they are just trying to con me into it as they don't have any WRX ones.

Thanks

Ozsooby
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Old 03-27-2006, 10:48 AM   #2
Jaxx
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couple things

power is aprox. the same as far as we know
its very difficult for us to swap in the TT due the LHD stearing rack

the TT has a uber complex system of vaccume lines that complicate things .. but it shouldn't be that much more difficult
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Old 03-27-2006, 10:51 AM   #3
Matt Monson
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Avoid the TT like the plague. It's not a very good design, as Jaxx alluded to. Yes, the engine itself is pretty much identical, but the plumbing, turbos and ECU are very different. If you are serious about doing a swap, spend the extra $$$ and get a single turbo swap from a '97-98 WRX. This will be the most similar to yours in the wiring and the most straightforward swap to perform...

ps. Drop a line to sixpack subaru. He's in your neck of the woods and pretty well connected. He may be able to help you find a front clip...
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Old 03-27-2006, 12:36 PM   #4
snowman4us
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what ppl are doing w/ the TT settups is converting them to single turbo. Sense the 2 engines are the same between the T and the TT, all you have to do is get a diff. exhaust man, a single turbo, and a new IC allong w/ all the plumbing....o yeah, and ECU.
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Old 03-27-2006, 12:43 PM   #5
rob
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Could be my imagination, but I thought the TT motor had higher compression?

-Rob
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Old 03-27-2006, 12:49 PM   #6
Matt Monson
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Quote:
Originally Posted by rob
Could be my imagination, but I thought the TT motor had higher compression?

-Rob
Depends on the year...
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Old 03-27-2006, 02:19 PM   #7
chrisarella
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Wirelessly posted (Treo 600: Mozilla/4.0 (compatible; MSIE 6.0; Windows 95; PalmSource; Blazer 3.0) 16;160x160)

FYI, higher compression is bad for a forced induction motor unless you like blowing it up. Stay with the lower compression single turbo ej20 and you'll be happy. TT is an antiquated technology. The newer turbo designs start to spool at much lower RPMs and eliminate the need for twin turbos. Even the twin scroll set ups aren't necessay. They do have a nice even powerband, but a VF34 will get you great results for way less money than a vf37 or vf38 setup. I don't know what your budget is, but I'd save my money and get a newer WRX or STI front clip from Japan.

My $0.02
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Old 03-27-2006, 03:01 PM   #8
Jaxx
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higher compression from the factory some TT were 8.5 some 9.0
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