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Old 10-20-2001, 03:54 AM   #1
CHACHI
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Question should i swap out the 2.5 for the turbo legacy motor?

i have a chance to get a 91-96 tubo legacy engine ,should i take out my 00 2.5 non turbo and install this engine?
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Old 10-20-2001, 06:18 AM   #2
Keiho
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If you want to. It's not too shabby, you could build up the EJ22 motor a bit, run more boost, or you could just run it as is and build up the EJ25 motor.
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Old 10-20-2001, 06:25 AM   #3
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ah screw it. just buy a tec2 turbo kit and 9:1 pistons and have fun.
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Old 10-20-2001, 02:09 PM   #4
Eric SS
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swap and N20. gone. : (

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go 2.2. Better rod/stroke ratio for that fun high rpm driving

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Old 10-20-2001, 08:15 PM   #5
HOK
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closed deck, oil squirters and 15 pounds of boost...

Yea baby...

Hok
Question is how much..
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Old 10-20-2001, 11:48 PM   #6
CHACHI
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can you run 15 lbs on the stock 2.2 block
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Old 10-20-2001, 11:53 PM   #7
Eric SS
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swap and N20. gone. : (

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The stock bottom end is good to around 280hp which I believe is around 12lbs. of boost or so.

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Old 10-20-2001, 11:59 PM   #8
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I have a 91' turbo legacy sedan cranked up to 13lbs of boost. Its completely stock. Been running it that way for a year without any problems.
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Old 10-21-2001, 02:47 AM   #9
HOK
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yep i've run 15 pounds with no problems...

things still seem healthy... knock on wood.. but mind you this all depends on various factors...

Hok
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Old 10-21-2001, 07:44 AM   #10
CHACHI
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which factors?
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Old 10-21-2001, 11:14 AM   #11
Greg 99
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I ran 15psi on my Stock 99 RS Motor all day. Not a single probalem. it is all about tunning. You will have more options with a 2.2 block, but a 2.5 will be a tourqe monster.
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Old 10-21-2001, 05:11 PM   #12
HOK
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wow 15 psi on a stock 2.5, thats pretty crazy...

factors... tons.. do you have enough fuel?, timing, what turbo is it, intercooler efficiency? loss? psi drop? etc. etc...
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Old 10-22-2001, 12:28 PM   #13
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Quote:
Originally posted by HOK
closed deck, oil squirters and 15 pounds of boost...

Yea baby...

Hok
Question is how much..
What year did the 2.2 go to an open deck. I have a 96 legacy with the 2.2 and I want to put a turbo on it. Havn't researched much yet. I just got the idea last week. I want to go to a junk yard and pick up a used turbo form something like an old eclipse or volvo and make my own manifold. Only cause I cant afford a new turbo right now. I want to get approx. 10-15 lbs. Do you think it will handle it?
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Old 10-22-2001, 11:54 PM   #14
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Maybe i should explain what i said means... You can't just use the block and run 15 pounds of boost... You must have adequate fuel delivery, timing, (ie tuning), mgmt, etc. I have larger injectors than an average car. I beleive that your legecy will have significantly smaller injectors. also your ecu must be changed.

you will need to spend a significant amount of money to upgrade i think....
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Old 10-22-2001, 11:59 PM   #15
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Thankyou. though I understand that I have to upgrade my fuel system to match the ammount of air. I was just currious as to weather or not I still had the closed deck engine and weather or not I would have problems with things such as the pistons and crank that are already in it. Also do you think that I will have problems blowing head gaskets?
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Old 10-23-2001, 12:21 AM   #16
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I wouldn't suggest turboing that engine... though i don't know much about it... (whether its open deck pistons etc,) I suspect it is open deck and the rods and pistons are not forged... I wouldnt do it if i were you... if you wanted to get aEJ22t then i would get better heads but then you have to get a new ECU, then harness.. and on and on. I'm not certain that your heads would work,.... but i wouldn't recommend it... you wouldn't just be risking blowing head gaskets..
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Old 10-23-2001, 07:45 AM   #17
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Thank you very much. I will take that into consideration
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Old 10-23-2001, 10:40 AM   #18
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Default go w/the turbo motor

A friend runs 13psi on his Legacy turbo, no IC and it runs fine.

there are several people running 2.2 bottem ends w/2.5 heads.....did you do a search?

I'll be putting 2.5 heads on my 2.2 within the next year hopefully
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Old 10-23-2001, 10:40 AM   #19
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Default go w/the turbo motor

A friend runs 13psi on his Legacy turbo, no IC and it runs fine.

there are several people running 2.2 turbo bottem ends w/2.5 heads.....did you do a search?

I'll be putting 2.5 heads on my 2.2 within the next year hopefully
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Old 10-23-2001, 11:23 AM   #20
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No I havn't done a search yet. Like I said I just go the idea not to long ago. Probaably do that to night. Though I didn't know that you could put 2.5 heads on a 2.2.
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Old 10-23-2001, 12:09 PM   #21
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Will the 2.2 intake manifold bolt up to the 2.5 or are they the same manifold? Also the exaust manifold will have to be changed if I am not mistaken because the 2.5 had to exaust ports where as the 2.2 has a single exaust port on each head. Also does that lower you compression our is the chamber the same size as the 2.2?
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Old 10-23-2001, 04:45 PM   #22
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Not to be a stick in the mud, but do you plan to drive the car on the street? If so, better stick with your 2.5. Swapping an older engine into a newer car is illegal. You might get lucky and the inspection stations won't notice, but I don't think thats a risk I'd be willing to take.
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Old 10-23-2001, 06:28 PM   #23
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I just swapped a 2.2T into my 2000 RS just last weekend. The swap is very easy to do and requires the basic tools.

Everything from your 2.5 will bolt onto the 2.2T. including your exhaust pieces and motor mounts. You'll need to purchase a stud and a heli coil for the starter from a 4 bolt transmission if you currently have a 6 bolt transmission. Make sure you remove the plastic backing plate on the rear of the 2.2T and swap it with your aluminum one. For gaskets you'll need:

Oil pump o-ring. Oil pickup o-ring. Two header gaskets. Two intake gaskets. One tube of orange form-a-gasket (subaru). Two coolant tube o-rings. For head gaskets use the composite (1 layer) SOHC head gasket with your 2.5 heads.

The 2.2T was used in 91-94 legacy's. The 96 legacy has an open deck block.

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Old 10-23-2001, 08:31 PM   #24
HOK
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Glad to hear your EJ22t is running fine... on the vishnu board.

oh and yea... what fitz said...

HOK
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Old 10-26-2001, 06:30 PM   #25
mikeje
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Default boost pressure

Everyone seems to compare max boost pressures between different engines. Why? If you check out cobb' site (cobbtuning.com) under their teck articles they have a graph showing the flow of different heads. the 2.5 sohc head flows about 25% better than the stock ej22t head. So of course you can run more boost on a stock ej22t motor. At the same boost, less charge in the cylinder. A 2.5 on a 22t block is a good combination, and will require less boost for the same power.

What we need is a real time pressure transducer in the cylinder: maybe a combo pressure/spark plug. Would't that make tuning easy. cylinder pressure vs crank angle at any given speed and boost.

Boost is secondary to what makes it to the cylinders. Honing, cams, valve timing etc. affect the flow and thus the charge pressure.
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