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Old 02-11-2003, 07:00 PM   #1
LIDGUY
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Member#: 26900
Join Date: Oct 2002
Chapter/Region: NESIC
Vehicle:
1988 Fiero Countach
G5 Rally Car

Question What's the deal with the 2.5?

Just looked at the brochure a few days ago.

What do you think of it.

Has subaru released anymore information on the design of the 2.5 turbo motor and how it achieves 300/300 production, e.g. compression ratio, boost pressure etc? Does it use a semi-new strengthened semi-closed or closed deck block design or RS style EJ25 with different head stronger tougher internals etc. Is it designed with potential for even more output?

What's Subaru's logic behind it? U.S. lack of attacment (for now) to rally and thus the 2.0 spec? Production costs; common parts with other subarus, displacement allows JDM Sti power without requiring the JDM Sti materials for internals, valves etc.

If its as good as it sounds so far, subaru will have made their US spec cars the envy of Japanese and European enthusiasts from the exact converse in just two years!
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Old 02-11-2003, 07:20 PM   #2
kage
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Default

The 2.5t uses a new engine design with a semi-closed deck. It definitely has stronger internals than a NA EJ25, but probably not as strong as the EJ207.

Top 5 reasons to develop 2.5 turbo motor:
1. Americans love torque and hate turbo lag
2. US emissions laws make a high boost turbo a booger to pass.
3. Lower stressed engine equals longer life
4. 2.5t can become the new performance engine across the Subaru lineup
5. Evo-stomping
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Old 02-11-2003, 09:13 PM   #3
n2xlr8n
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Location: Bama
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02 WRX MBP
It lives! ; )

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Just curious:

Can you say with 100% certainty that the STi EJ25 is a semi-closed design?

Why do you think the STi EJ25 wouldn't be as strong as the EJ207? Not as good of a rod-stroke ratio?

I would probably buy an STi if I knew for certain that the internals are all forged, and the block is closed / semi-closed.
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Old 02-11-2003, 11:18 PM   #4
ToddStratton
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This has all been covered many times in this forum. Here is a link to the spec sheet:
http://vocuspr.vocus.com/vocuspr30/p...s_2003_rev.pdf

Yes, the 2.5L turbo is semi-closed deck and between the press release at the Detroit Show and the spec sheet linked above, the internals are all forged (the one unknown is the crank, but according to Trey Cobb in another thread, the NA EJ25 has a forged crank, so the turbo is probably as well).

Further speculation on the strength of the motor is without basis. Once they show up and people start playing, then we'll know.

TRS
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Old 02-12-2003, 01:15 AM   #5
GaryS
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Quote:
Originally posted by n2xlr8n
Just curious:

Can you say with 100% certainty that the STi EJ25 is a semi-closed design?

This info has been on Subaru's official STi release site since day one of Detroit. You must have been under a rock for the last month!!

http://www.impreza.subaru.com/micros...?pageID=engine
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