I just bought a 2001 2.5 (2 door) it has the EJ25 in it and it runs fine.

 

I also bought a separate EJ20 turbo motor with a rod knock.

 

Ultimatly I want the Turbo in the car but I need to know which motor to use or rebuild.

 

1. Can the EJ25 be turbo'ed?

 

2. Can I use the stock turbo setup from the EJ20?

 

3. Which motor is "Better" "Bigger" The EJ20 or the EJ25?

 

I understand the need to search but I'm in a time bind today and I would really appreciate some help cause I'm away from home and doing this from my phone.

 

Thanks in advance.

 

Mike

1. Yes. Any motor "can" be turboed. To make it last you will need to change pistions, the phase 2 2.5 has something like 10.5 compression, most turbos motors have 8.0-8.5

 

2. Yes. You can use any turbo, the trick is selecting the one that will work best with your motor. Use one to small you will run out of power to soon and not make top hp, get one to large and your car will seem slow because it will take along time for the turbo to kick in. The ej20 turbo would work ok on a 2.5 if you wanted to save money. If the motor has alot of miles you may need the turbo rebuilt before using it.

 

3. Either can be better. ej20=stronger ej25=more hp

there's too many variables. starting with research like how much an EJ25 turbo will cost you and an EJ20. then see what you like. we don't know how you do your work, who does it, how much down time can you withstand, how long will this take you, what kind of rebuild you'll want, how reliable do you want this thing, what machine shop prices are around you, forged internals...etc. way too many possibilites. this could cost 20,000 or 500.

 

check out NASIOC for all sorts of info on rebuilds, cost and options between those two engines.

 

there's just no way to answer such an open ended question that has no guidance or information. if you don't know where you're headed we certainly can't tell you how to get there....Alice In Wonderland kind of thing.

 

rebuilding the EJ20 leaves the car driveable until you're ready to do the engine swap. rebuilding the EJ25 leaves you with more down time.

If I Want my Subie`s Engine to Last Longer and If I Had To Choose between a Good Runnin` EJ20 Turbo and a Good Runnin` EJ25 Non-Turbo, I Will Preffer the EJ25 Non-Turbo and let it like That.

Non-Turbo Engines Last Longer, They Work "Freely" not "Under Pressure" that Wears Faster an Engine. Also, They`re Simplier...

Well... That`s my Idea, I Like "Long Lasting" Things... but if you Want to Race, Then I Suggest to Turbo the EJ25.

Good Luck!

turboing for turbo's sake is stupid (not meaning any offense or passing judgement) the fact is you see honda tards putting 1100 bucks down to get 6-9 lbs of boost and yes there is a difference but not a huge one.

 

 

My money would be:

 

the 2.5

-je pistons 7.5:1 or so pistons with good JE rings(ive seen way to many exspensive rigs blow because they saved 20 on some chineese rings)

-acl race bearings all the way through.

-bigger cams

-550-750 cc injectors

-cheapo intercooler off ebay

-piggyback system

-and a walbro 255

-metal head gasket

-spend a little get it tuned right

-mitsubishi 14b or garret t-25 turbo (50-100 bucks) 15-20 lbs of boost

 

that should let you handle 10-18 lbs of boost real easy: then you can make an sti wet itself

all in all it would be about 1500-2000

 

then all you need to worry about is not killing yourself with boost its always better to bide your time and save before running into a project, then you'll have a uber fast DD and not a lawn ornament that goes psht when you shift on your monthly drive...