I noticed that the new ones have 145+ horsepower, while my 1990 Ej22 has only 130. Is this changable through retunning my ECU or do I have to do other things as well to get the same power output?


thanks

I was actually wondering the same thing, especially considering that the original ej22's were closed deck motors.

I'm assuming it just has to do with tuning, and you probably can get a LOT of power out of the old Legacy Motors

?:huh:

nm... ej22t were closed decked not all earlier ej22... i'll out this hear if somone was searching like i was

there are several differences. The 2.2L was revised as Phase 1 (137HP) and later on (MY99) as Phase 2 (142 HP).

Here is some info I have on Phase 2 (came from techinfo.subaru.com site)


The 2.2 liter (SOHC)(Phase 1)has been enhanced starting with 1997 model year.The single overhead camshaft
engines have had internal and external changes that yield an approximately 10 %increase in power and 3%increase
in fuel economy.Accomplishing this involves many factors, one of which is engine friction reduction.




The piston,a major source of engine friction has been coated with a friction reducing agent called Molybendum.This thin coating not only allows a smoother travel through the cylinder but also reduces cylinder wall scuffing.This coating will wear off over time and is not an indication of a problem.
The skirt of the piston has been reshaped and the overall weight has reduced by approximately 100 grams. Compression ratio has been increased to 9.7 to 1 by reshaping the crown of the piston.This eliminates the clearance that was available between the piston at TDC and a fully opened valve.Piston pin offset has been changed to 0.5 mm.Piston to cylinder wall clearance has
been reduced by increasing the piston diameter.



Another source of high engine friction is the valve train. Hydraulic lash adjusters are always in contact with the
camshaft or valve rockers.The hydraulic pressure of the lash adjuster must be overcome during operation and the
most critical time of engine start.To overcome this situation and to contribute to the total reduction of friction loss the SOHC engines will have solid valve adjusters.The
scheduled service of these valve trains is set at 100,000
miles and is not required during the PDI.The SOHC engine

It's what he said plus that the MY00-01 have a 10:1 compression. All the power is from improvements to the engine itself so and ECU swap wouldn't help with improved power.
Joshua

Originally posted by WagonMonster
I was actually wondering the same thing, especially considering that the original ej22's were closed deck motors.

I'm assuming it just has to do with tuning, and you probably can get a LOT of power out of the old Legacy Motors

older style ej22t... closed deck. low pressure cast. 30psi stock form....

http://www.axispowerracing.net/22shortblock/AXIS003.JPG

open deck style ej25(newer ej22s are also open deck).... high pressure cast... some people can get 12 psi out of ej25s... I dont know of to many tuboed newer 2.2s...

http://www.freebmw.net/Share/CarsBoatsBikes/Subaru/EJ25/DCP_1204%20(Medium).JPG

I was looking at some cylinder head flow data with Trey Cobb and apparently the old 2.2 heads flowed like poo compared to newer stuff. No idea if newer 2.2 motors fixed this.