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Old 09-14-2003, 05:23 AM   #1
RawCode
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Default I wish Subaru would revamp the Ej25

I mean for '04 they could have done a few things to increase the output of the ej25.

1. New cams. Cams that can perform like Cobb's does. It would not cost much to reprofile cams for the factory.

2. A 2.25 in exhaust stock would be nice. It is not a noise issue at all as cars can be quiet and only lose 2hp. (relatively speaking) Again it would not cost to much to do this. Not mandrel bent though, too costly.

3. Make the heads more efficient.

With a little work, Subaru can turn our 66hp/L into 76hp/L easily (optimist aren't I!)
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Old 09-14-2003, 12:42 PM   #2
Penphoe
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You have to remember that Subaru has to balance other things as well. Sure, they can make a "high-output" N/A engine, but other things would have to be sacrificed.

For example:
Low end torque (the torque we all love)
Longevity - will parts wear down faster? Do they ened to re-engineer the valves, springs, to different materials, angles, etc., would the engine ping itself to death?
Emissions - in North America, the emissions regulations are becomming tighter and tighter
Fuel economy - an HO would be awesome, but it would suck if I have to fill up every other day.
Price - that's a big one - will they loose their market?

But that doesn't mean we can't stop dreaming!

LaterZ!
Darren!!
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Old 09-14-2003, 02:27 PM   #3
cvalle-sd
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I doubt they would spend money to get more out of the EJ25 (which does exactly what they designed it to) when there are two turbo engines already developed which would totally eclipse whatever the EJ25 mk2 might theoretically produce. Turn of the knob, and those turbos will get even more...
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Old 09-14-2003, 05:17 PM   #4
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as i understand it the new 2.5 wil produce like 170 hp and 170 ft - trq
(found in 05 legacy)
or did i dream that?
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Old 09-14-2003, 06:14 PM   #5
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Quote:
Originally posted by Jejunum
as i understand it the new 2.5 wil produce like 170 hp and 170 ft - trq
(found in 05 legacy)
or did i dream that?
I read 170 hp, but still 166 lb/ft torque.
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Old 09-14-2003, 09:24 PM   #6
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i'm guessing they just added the avcs heads to the new legacy, just in improve the breathing at high rpm, but thats a little improvement i love to see

but keep in mind, they redid the rear sway bar in the 04, added the plastic intake manifold, and did a few other changes i believe to improve the performance and give it a more balanced feeling

but i would love to see them just give the rs the 11.4" front rotors off the wrx, and an aluminum hood and maybe trunk lid to cut some fat off

oh yeah, and some quicker steering ratios, give the sti a nice 13.5:1 and swap the rs and wrx to 15:1
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Old 09-14-2003, 09:38 PM   #7
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Quote:
Originally posted by nySulli
i'm guessing they just added the avcs heads to the new legacy, just in improve the breathing at high rpm, but thats a little improvement i love to see

but keep in mind, they redid the rear sway bar in the 04, added the plastic intake manifold, and did a few other changes i believe to improve the performance and give it a more balanced feeling

but i would love to see them just give the rs the 11.4" front rotors off the wrx, and an aluminum hood and maybe trunk lid to cut some fat off

oh yeah, and some quicker steering ratios, give the sti a nice 13.5:1 and swap the rs and wrx to 15:1
aluminum hood is absolutely necessary grrrr... the rotors def piss me off because its impossible to find good aftermarket street pads for our rotors (thats what i believe atleast pleas correct me if im wrong). what was the swabar change for 04 and how do we know the plastic intake manifold is a good thing? ive read the debate and there is no clear answer imho
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Old 09-14-2003, 11:34 PM   #8
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i read somewhere that the swaybars are now 13mm front and rear, to balance the handleing, instead of the tiny rear bar we used to have

as for the plastic intake mani, how is it not a good thing

1. smoother inner wall = less turbulance and better flow
2. plastic conducts heat poorly = cooler air into engine
3. its just cheaper for subaru
4. i have yet to have any issues with the rough idle people have had in the past or the hesitation, i think it eliminates the ground interference in the mani, thus no need for the grounding mod
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Old 09-15-2003, 11:25 AM   #9
cvalle-sd
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plus the plastic manifold has to weigh less than the aluminum one...
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Old 09-15-2003, 11:55 AM   #10
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Quote:
Originally posted by Jejunum

...and how do we know the plastic intake manifold is a good thing? ive read the debate and there is no clear answer imho
There is no debate. Kostamojen is the only one that doesn't get it.

Go back and read the update to the thread I made for some first-hand observations.

- Steve
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Old 09-15-2003, 12:41 PM   #11
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yeah, i also like the observation made by the owner of that one performance site, that they could grab the plastic mani after running the engine, where the alum one would steam off water sprayed on it
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Old 09-15-2003, 06:16 PM   #12
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y all do realize that the ej25 na is on its .. lets see
96
97-98
99
00
04

5th major redesign
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Old 09-15-2003, 11:28 PM   #13
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well i would hardly call the 04 a major redesign of the ej25, it just got the plastic mani, thats about it, a few minor things, normal year to year changes

but the phase II is definitly due to a little bit of an update, avcs looks like its coming, hopefully not just to the legacy
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Old 09-15-2003, 11:43 PM   #14
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Quote:
Originally posted by nySulli
i read somewhere that the swaybars are now 13mm front and rear, to balance the handleing, instead of the tiny rear bar we used to have.

Hasnt the rear bar always been 13mm? (it was on my 01 RS).

-justin
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Old 09-15-2003, 11:47 PM   #15
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Quote:
Originally posted by Blindeye_03



Hasnt the rear bar always been 13mm? (it was on my 01 RS).

-justin
They have, although the front was 19 0r 20mm.
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Old 09-16-2003, 01:00 AM   #16
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i must have heard wrong, i was under the car doing an oil change the other day and the front bar is pretty beefy, certainly more then 13mm
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Old 09-16-2003, 01:42 AM   #17
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in the gc8 rs iirc, the front is 15 and the rear is 18 - that was a million years ago (that I was stock)
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Old 09-16-2003, 01:51 AM   #18
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Quote:
Originally posted by cvalle-sd
in the gc8 rs iirc, the front is 15 and the rear is 18 - that was a million years ago (that I was stock)
98-01 RS 19MM front and 13mm rear stock.
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Old 09-16-2003, 12:09 PM   #19
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D'OH I've been driving backwards!
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Old 09-16-2003, 02:11 PM   #20
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Quote:
Originally posted by nySulli
well i would hardly call the 04 a major redesign of the ej25, it just got the plastic mani, thats about it, a few minor things, normal year to year changes
Do you not consider the fact that they moved the MAP sensor into the torque box as well as added an IAT in there as well a major change?

Just curious

If you're read Steve's post you'd also see that with the new Intake manifold the moved around a few brackets & such.

Jon
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