I found this page on Google, and got this info on a JDM Turbocharged EJ20 from a Legacy RS 97-98. My Forester is 1998 and uses a EJ25D, what do I need to do to accomodate this engine in my car? Is it better to install this one, or should I just install a turbocharger and intercooler on my existing engine?

 

http://www.jdmenginedepot.com/jdm_engine_details/203/Subaru_EJ20_Legacy_RS_&_GT-B_Turbo_(11/96)_JDM_EJ20

Edited October 31, 201312 yr by okamikai

I am thinking wiring harness difficulties.

I am thinking wiring harness difficulties.

I was thinking the same, can the wiring be done using schematics?

Anything can be done, depends how modivated you are on this project. Wireng wont be fun... If you good with cars and habe merged harness before you could do it, but will still take lots of time.

And jdm to us standard will be much harder.

 

Suggestion though, don't waste your time with the EJ25d. You'll end up blowing head gaskets one after another.

Edited October 31, 201312 yr by Prwa101

Anything can be done, depends how modivated you are on this project. Wireng wont be fun... If you good with cars and habe merged harness before you could do it, but will still take lots of time.

And jdm to us standard will be much harder.

 

Suggestion though, don't waste your time with the EJ25d. You'll end up blowing head gaskets one after another.

Even if they are original HGs? the ones in my EJ25D are original subaru, the metal ones. I had to replace pistons to forged .020 (100mm) cuz I had to bore the cylinders.

Although the EJ25D does have head gasket problems (so does any N/A 2.5, the newer ones are just in a different way), if they are replaced PROPERLY they shouldn't be an issue again. Many people don't check the heads for being warped, don't follow the torque procedure, or use head gaskets that don't hold up.

EJ25 has too high compression to reliably accept turbocharging.

 

If you have to ask what all goes into a turbo swap, you probably shouldn't be trying to do one. Much easier to just buy a Turbo car than to do a swap.

A turbo swap into that car is difficult enough with a parts car. Buying all of the necessary parts separately is a huge undertaking.

I would imagine there ar eno turbo fresters in puerto rico. I'm sure there are plenty of chrome plated scooters, though. You would have to swap the front crossmember, or chop and weld a spot to allow for the turbo up=pipe.

 

The motor would phyically fit, but the wiring and or ecu may be different. If you know what you are doing, it can be done.

 

I know puerto rican folk to be pretty crafty with their vehicles.

Since you stated you put forged pistons in with a .20 overbore (dunno why you reused the factory head gaskets though), I'd check to see what compression it's at now. Usually 9:1 is a common ratio that accepts a power adder. 9.5:1 is getting up there. You'd HAVE to run premium fuel all the time. Might be able to get away with a slightly thicker head gasket to drop ratio, but it's a lot of work to turbo a non turbo car. Can always relocate the turbo somewhere else, but even that would require custom oil and coolant lines, custom oil drain (has to be done correctly to avoid oiling troubles) custom down pipe, etc. Then you need intercooler, piping, ECM with proper tune, etc. Lot of work. You'd be better off getting a small roots style blower and making that work if you really wanted forced induction, but compression ratio MUST be acceptable. If the engine is 10:1 cr, you might be able to get away with 5psi or something w/o issues. Keeping detonation away is the biggest challenge, and having a proper tune is vital. Could also try and convert to a carb'd setup if you can't get the ECM tuned.

Edited November 1, 201312 yr by Bushwick

Well, to answer to the question about turbo foresters, yes there are, but not on the 98-99 range, I've only seen one STI model from 2000, looks just like mine, but in white and with different tail lights. I was told at the local dealership that MTs and Turbo models were not introduced to the local market because it was promoted as a family vehicle, and not as a sports car, mine's an import from Nevada that I bought for 3k at a local dealer, with the head gasket issue brewing up. For Fox, the chrome thing is actually brought by Dominicans, chrome fashion died with the 70's, LED fashion is a total blow out, school buses and tow trucks look like freaking x-mas trees, and yes at some time in history we held the title of the fastest compact car in drag racing, Ms. Sakura, a mean 92' Mirage, that and transforming Accents into rockets