98 Legacy 2.5 GT

fuzionburn · Post by **fuzionburn** » Fri Oct 22, 2004 3:36 pm

Looking for a twin turbo kit for this car and possibly a torque converter and yes I know a torque converter is for auto. If anyone could point me in the right direction it would be much appreciated. Just bought this beauty yesterday already looking for upgrades.

Matt Monson · Post by **Matt Monson** » Fri Oct 22, 2004 6:59 pm

Do a search before you get your heart set on a twin turbo. They are pointless and won't fit a USDM car anyways. If you want to use a turbo kit on the stock engine look at the AVO unit that Rallitek sells. Or if you don't have that kind of $$$, try Forced Air Technologies. They will both come up on a google search.

lastly, if you do want to replace the block for lower compression and more boost; get an EJ257 shortblock from a USDM STi and either build your own turbo kit, or use it with one of the above. But you have great heads for use with a turbo and wouldn't need to buy a whole engine. You can get the shortblock from Tarmac here in Colorado. They have one of the best prices in the country on them. And they could consult you on the rest of the build if you chose to put together your own turbo "kit" They are experts on such things...

-K- · Post by **-K-** » Fri Oct 22, 2004 11:48 pm

Twin turbo is only good for big engines, or the "cool" factor. Fact is the best thing to do with a B4 is go to a WRX single turbo setup. Plus it's really pointless on a N/A engine that you can't run much boost on. I like Matt's idea about the EJ257 block. That's going to be some work and some money, but it's the right way to do it.
I'd say to make it easy get a front cut from a JDM Legacy, you get the ECU, all the wires, mounting stuff, and turbo engine with 260hp.
I'm betting that would cost no more than an aftermarket turbo setup that would get you 260hp. Then you could make some back by selling the old engine.
The turbo engine has a lot of things different than just a turbo on it and they are all worth haveing. I don't like aftermarket turbo systems much myself.

azn2nr · Post by **azn2nr** » Sat Oct 23, 2004 5:37 am

get a motor from a auto jdm wrx and put that in. its the easiest and safest way. and you may find yourself with a motor with a 16g

91White-T · Post by **91White-T** » Sat Oct 23, 2004 4:13 pm

If you're looking for big power #'s single turbo is the way to go. I never really understood the point of putting two turbos on a two liter engine, but its kinda cool. Either way it won't fit, go with a single.

entirelyturbo · Post by **entirelyturbo** » Sat Oct 23, 2004 8:01 pm

The only way twin turbos would be really better than a single turbo setup would be to have one turbo feeding and being fed by one bank of cylinders on either side of the engine. Have fun fabricating that exhaust system though, among other things...

-K- · Post by **-K-** » Sat Oct 23, 2004 8:08 pm

Found some good reading here:
http://www.uniquemotorsports.com/Jon/index.htm
Legacy turbo onto a 2.5 GT

azn2nr · Post by **azn2nr** » Sun Oct 24, 2004 5:54 am

the legacy twin turbo is paralell. one turbo powered by one bank of cylinders

-K- · Post by **-K-** » Sun Oct 24, 2004 7:36 am

The B4 is a Legacy

boostjunkie · Post by **boostjunkie** » Sun Oct 24, 2004 7:19 pm

azn2nr wrote:the legacy twin turbo is paralell. one turbo powered by one bank of cylinders

That is wrong. The legacy twin turbo is a sequential turbo setup. There's a small turbo and a big turbo. Both are fed by all four cylinders. That is the reason there is a "valley of death" in boost on those cars. The changeover point from where the first turbo spools and the second one spools causes a dip in the power band.

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98 Legacy 2.5 GT

98 Legacy 2.5 GT