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Old 08-03-2008, 01:50 AM   #1 (permalink)
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Subaru Impreza STi VI - What rebuild to go for?

Have a 85k miles STi VI. The very last model from the classics. The engine finaly went last week. So I have a choice

1) Standard rebuild - same turbo, same block. Approx 310bhp
2) Standard rebuild - but different Turbo. Approx 360bhp
3) Go for a 2.5 rebuild. But then I think I need a gearbox upgrade to take the torque. Approx 400-440bhp.

Anybod else had a similar decision to make. Anyone advise on what parts I need for (2) and (3)?
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Old 08-03-2008, 05:42 PM   #2 (permalink)
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Location: Wilson, NC
I'm not a Subaru guy, but if you are going to dump a lot of effort into the car and it's not your daily driver, I would probably go standard rebuild with upgraded turbo. Unless you already have the gearbox and wouldn't have to purchase anything.

You can get a turbo for cheap - the gearbox would hit you hard though.

I love STis, I envy you!
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Old 08-03-2008, 07:00 PM   #3 (permalink)
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what kind of money are you willing to spend? I think the bigger turbo will get you a lot more power, but at the cost of serious turbo lag. What about twin turbo-ing it a la the EJ20TT? But I guess that will put you back in the same place with the gearbox...
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Old 08-03-2008, 08:58 PM   #4 (permalink)
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Think I'll go for an uprated Turbo.

Done some more digging on the 2.5 upgrade and it's the mega-torque that strips gears (2nd and 3rd). Putting a 6-speed box in the car solves the problem as it's much stronger. But in a classic shape it means also changing the rear diff too. I'm certainly not going to start spending that kind of money.

Thanks for the advice.
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Old 08-04-2008, 04:46 AM   #5 (permalink)
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Good choice. make sure you throw some pics up here when you get it all squared away.
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Old 08-04-2008, 02:56 PM   #6 (permalink)
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Yeah, I want to see the pix when you're finished as well! (wrx wagon owner here!)
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Old 08-05-2008, 02:49 PM   #7 (permalink)
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Location: Pretoria (Tshwane), RSA
Always build it to be faster, that's my motto. Definitely go for the six-speed, the five-speed gearboxes are like glass.

It's been a while since I've laid hands on Subarus, so I have no idea what's new with their stuff. Last scooby I had was a 2.5 RS that had no aftermarket support back then and importing a JDM engine was an arm and a leg, forget about trying to get a 22B engine.

If you're going with a big dawg turbo, make sure you bump up to a nice sized intercooler, injectors, fuel pump, and whatever they use for fuel control (but I'm sure you already know that).
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