Performance of N/A 2.5 litre?

jetfreak · 02-02-2001, 01:16 PM

How much power can you squeeze out of a normally aspirated SOHC 2.5 litre engine? New intake and manifold, cams, exhaust and various other items would be required, but I'd like to know what kind of power is available without adding nitrous/blower/turbo set up? Also, what would driveability be like? Gutless on the bottom end and a screamer in the upper revs?

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Michael · 02-02-2001, 01:45 PM

it really depends on how much are you willing to spend on the setup.
you should be in the 200-210
with header, exhuast, ud pulley, intake, and a programable ecu (tec II, haltch,....)
laters
michael
ps: with the programable ecu you need to tune in right for the best performance too.

CosmoTheCat · 02-02-2001, 01:58 PM

Is the programmable ecu something you have to monkey with all the time? Or can you just set it (pay someone else to set it right) and leave it?

John2.5RS · 02-02-2001, 02:12 PM

It all depends on which one. they get fairly pricy.

stimpy · 02-02-2001, 02:24 PM

The Tec-II can be tuned properly, then it can be left alone. I don't think any of the programmable ECU's require constant tinkering. It just takes a lot of effort to get them to the non-tinkering stage.

I _think_ jun racing has done development on an NA EJ25 and has a rumoured 300hp, but this is unconfirmed AFAIK. Trey Cobb of Cobb Tuning has his RS running at approximate 220hp at the flywheel, but that is speculative. He has dyno results somewhere if you do a search. He had P&P heads, E&H intake manifold, P&P throttle body, upped compression to 10.5:1, borla headers and exhaust, intake (not sure), na stage 2 cams, and Haltec ECU.

HamFist · 02-02-2001, 04:24 PM

13's...stay tuned

.

Michael · 02-02-2001, 08:32 PM

the programable ecu that i know
haltech you can have or save a few settings.
setting that you have tune to suit your needs.
but of course you will need to carry a labtop computer around inorder to tune the car.
hope this helps
michael

02-02-2001, 01:16 PM	#1
jetfreak Scooby Newbie Member#: 3056 Join Date: Nov 2000 Location: Etobicoke, Ontario, Canada Vehicle: 2001 Impreza 2.5RS Blue Ridge Pearl	Performance of N/A 2.5 litre? How much power can you squeeze out of a normally aspirated SOHC 2.5 litre engine? New intake and manifold, cams, exhaust and various other items would be required, but I'd like to know what kind of power is available without adding nitrous/blower/turbo set up? Also, what would driveability be like? Gutless on the bottom end and a screamer in the upper revs? * Registered users of the site do not see these ads.

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02-02-2001, 01:45 PM	#2
Michael Scooby Specialist Member#: 989 Join Date: Feb 2000 Location: New York Vehicle: 99 RS Graphite Gray Pearl	it really depends on how much are you willing to spend on the setup. you should be in the 200-210 with header, exhuast, ud pulley, intake, and a programable ecu (tec II, haltch,....) laters michael ps: with the programable ecu you need to tune in right for the best performance too.

02-02-2001, 01:58 PM	#3
CosmoTheCat Scooby Newbie Member#: 3409 Join Date: Jan 2001 Chapter/Region: NWIC Location: Woolley Vehicle: 1998 Ram 2500 Green.	Is the programmable ecu something you have to monkey with all the time? Or can you just set it (pay someone else to set it right) and leave it?

02-02-2001, 02:12 PM	#4
John2.5RS Scooby Guru Member#: 1140 Join Date: Mar 2000 Chapter/Region: SCIC Location: On the road Vehicle: 2013 Ecoboost'd F150 Grey	It all depends on which one. they get fairly pricy.

02-02-2001, 02:24 PM	#5
stimpy Homicidal Maniac Moderator Member#: 1612 Join Date: Jun 2000 Location: Austin, TX Vehicle: 2008 STI	The Tec-II can be tuned properly, then it can be left alone. I don't think any of the programmable ECU's require constant tinkering. It just takes a lot of effort to get them to the non-tinkering stage. I _think_ jun racing has done development on an NA EJ25 and has a rumoured 300hp, but this is unconfirmed AFAIK. Trey Cobb of Cobb Tuning has his RS running at approximate 220hp at the flywheel, but that is speculative. He has dyno results somewhere if you do a search. He had P&P heads, E&H intake manifold, P&P throttle body, upped compression to 10.5:1, borla headers and exhaust, intake (not sure), na stage 2 cams, and Haltec ECU.

02-02-2001, 04:24 PM	#6
HamFist Scooby Specialist Member#: 2112 Join Date: Aug 2000 Chapter/Region: MWSOC	13's...stay tuned .

02-02-2001, 08:32 PM	#7
Michael Scooby Specialist Member#: 989 Join Date: Feb 2000 Location: New York Vehicle: 99 RS Graphite Gray Pearl	the programable ecu that i know haltech you can have or save a few settings. setting that you have tune to suit your needs. but of course you will need to carry a labtop computer around inorder to tune the car. hope this helps michael