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Old 02-07-2011, 05:43 PM   #1
GuamSTI
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Default 98' Legacy GT (BD) USDM to a JDM motor

Who has done an engine swap from the USDM 2.5 GT Motor (NA) to the JDM Twin Turbo Motor? I have a few questions:

1. my car has a 4EAT transmisiion can I still use this with the JDM Twin Turbo Motor?

2. Is there a link or place where I can send my cars wiring harness and they can splice the JDM harness?

3. are there any other issues that I should watch out for?

These are pictures of the type of motor that I plan to use. unfortunately it comes with a transmission.





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Old 02-08-2011, 04:13 AM   #2
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or would it be best just to install a current 07' and up NA motor or just rebuild my 1998 Motor?
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Old 02-08-2011, 06:32 AM   #3
Cervantes
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if you want to turbo your car, i would advice against twin turbo. twin turbo will limit your hp gains and is harder to work on. if i had the money, i would do a single turbo swap.
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Old 02-08-2011, 12:11 PM   #4
slaytalera
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You have a lot of work ahead of you if you want TT, no one touches them here, and from the research ive done, i have yet to find a pinout or wiring diagram for those motors. Also the 4eat on your car wouldnt be able to handle all that power and torque
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Old 02-08-2011, 03:41 PM   #5
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is an 07' WRX NA motor more reliable than the 98' LGT motor even after I replace the headgaskets?
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Old 02-08-2011, 11:30 PM   #6
Patrick Olsen
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WRX NA motor? I's confused...
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Old 02-09-2011, 07:11 AM   #7
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Quote:
Originally Posted by Patrick Olsen View Post
WRX NA motor? I's confused...

hahahaha how about 07' Impreza NA motor?
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Old 02-09-2011, 10:39 AM   #8
Huffer
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GuamSTI - my advice is, before you ask another question, READ READ READ all the threads about swaps.
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Old 02-09-2011, 03:29 PM   #9
slaytalera
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Quote:
Originally Posted by Huffer View Post
GuamSTI - my advice is, before you ask another question, READ READ READ all the threads about swaps.
Better yet, take it to a shop that can discuss all your options with you, it sounds like your in over your head on ANY swap, no offense intended, but no swap is going to be plug and play, there will always be the issue of wiring, splicing, missing parts ect.
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Old 02-10-2011, 09:38 PM   #10
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Forget about a twin turbo setup. You can't run TT on the left hand drive cars, the steering gets in the way.

I have a friend with a BD legacy with teh EJ20R (the engine you're looking at), but he had converted to a single turbo on it. He runs a custom harness with a megasquirt ecu and ford ignition

As far as teh 4EAT trans, it doesn't hold up well with extra power. If you were to push more then 200whp on it, you would cause some pretty serious damage pretty fast. 5 speed WRX trans is the best way to go if you want to turbo your legacy.
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Old 02-11-2011, 08:56 PM   #11
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I am not really decided on turbo charging the Legacy. Thanks for the information
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Old 02-14-2011, 05:17 PM   #12
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Quote:
Originally Posted by GuamSTI View Post
I am not really decided on turbo charging the Legacy. Thanks for the information
Well you can, just use a EJ20 from a WRX, their cheap and easy to find.
You can score one for less then 1500$ being less then 120K longblock complete

The 4EAT is also going to be the biggest issue as well, but it can be reinforced but it'd be cheaper to swap it to a manual or put in a 5eat.
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Old 02-14-2011, 05:40 PM   #13
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I agree
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