Similarities between 2.5 in Legacys and in STI? - Subaru Enthusiasts Car Club of the Sierras

STIwish · 2004-02-15, 10:00 PM

How close are these engines? Are they the same minus compression ratio and turbo, or are they completely different?

Nick Koan · 2004-02-15, 11:18 PM

They are relatively the same. I think the only thing difference is that the N/A 2.5 engines don't have forged internals (and a turbo/intercooler, obviously).

sybir · 2004-02-15, 11:28 PM

2.5T is a semi-closed deck, as opposed to the open NA motor. Heads are totally different with respect to cams, valves, etc. The 2.5T motors have AVCS (variable valve timing), and there's other stuff, I'm sure.....

I dunno if there's any difference in cylinder liners or anything, though.
But yeah, forged rods, crank, lower comp pistons, etc...

Dean · 2004-02-16, 01:42 AM

I don't know if it bad form to comment on someones sig or not, but...

I had to think about Sybir's "Drifting is the automotive equivalent of figure skating. Rallying is playing goalie without a face mask and grinning." and thought it didn't quite fit my mental image.

I would liken drifting more to bobsleding, and rally to luging naked while baseball pitchers throw snow/ice balls at you and grinning.

STIwish · 2004-02-16, 02:31 AM

So basically, forget building a turbo legacy unless you're willing to swap correct?

Kevin M · 2004-02-16, 02:45 AM

Quote:

Originally Posted by Dean

I don't know if it bad form to comment on someones sig or not, but...

I had to think about Sybir's "Drifting is the automotive equivalent of figure skating. Rallying is playing goalie without a face mask and grinning." and thought it didn't quite fit my mental image.

I would liken drifting more to bobsleding, and rally to luging naked while baseball pitchers throw snow/ice balls at you and grinning.

Bobsledding>figure skating. This is by virtue of actual objective event results being used to determine the winner. Judges determining a winner based on form = not a motorsport.

Good call on the luge thing though.

sperry · 2004-02-16, 02:46 AM

Quote:

Originally Posted by STIwish

So basically, forget building a turbo legacy unless you're willing to swap correct?

Or just get a Legacy Turbo.

Kevin M · 2004-02-16, 02:46 AM

Quote:

Originally Posted by STIwish

So basically, forget building a turbo legacy unless you're willing to swap correct?

It can still be easily done, just can't expect the same levels of power and reliabilty as with the STi motors.

BOO · 2004-02-16, 09:21 AM

Dude, Just Get an STi

:wink:

STIwish · 2004-02-16, 12:20 PM

LOL, will never be able to afford it... but I was asking for a friend about the Legacy.

Nick Koan · 2004-02-16, 12:23 PM

You could probably turbo it with low (very low) amounts of boost without doing anything else to the motor.

But if you wanted decent boost/power, you'd probably have to add forged internals and maybe get some STi heads.

By that point, you're probably pretty close to what a swap would cost.

BOO · 2004-02-16, 12:48 PM

Quote:

Originally Posted by STIwish

LOL, will never be able to afford it... but I was asking for a friend about the Legacy.

Never say "NEVER"

STIwish · 2004-02-16, 12:51 PM

Oh, I do say never, but hey, you NEVER know

Kevin M · 2004-02-16, 06:45 PM

For direct comparison sake, the NA Legacy has the same motor that DrFunk is runnig. You can do the exact same things to it.

drfunk · 2004-02-17, 12:54 PM

im running forcedartech stage one kit at 7 psi and still running close to rich. im also working on an air/water i/c. im having the intake for it fabricated as im writing this..ill have it completed tomorrow and show it off at the meet on thurs.http://www.forcedairtech.com/stage1.htmlalso running vortec FMU.

drfunk · 2004-02-17, 04:09 PM

ok well my air/water i/c intake will be finished next week. mcvay's had to order 180,45, and 90 degree mandral bends to complete it. they come in on mon and they will finish fabricating on tues.

MikeSTI · 2004-02-17, 04:15 PM

^^^^

but you'll have it soon :wink:

sperry · 2004-02-17, 04:45 PM

Quote:

Originally Posted by drfunk

ok well my air/water i/c intake will be finished next week. mcvay's had to order 180,45, and 90 degree mandral bends to complete it. they come in on mon and they will finish fabricating on tues.

So I guess the rumor that McVay's has a mandrel bender is false.

dknv · 2004-02-18, 10:32 AM

Last year I went looking for a mandrel bender in Reno, and found none in NNV. The closest place was in Sacramento.

LVSUBARU · 2004-03-02, 08:36 PM

I just got ahold of a STi short block. As far as the block goes the only difference appears to be the semi-closed deck. The pistons look pretty sweet. Nice and dished.

2004-02-15, 10:00 PM	#1
STIwish EJ251 Join Date: May 2003 Location: Ocala, FL Posts: 894	Similarities between 2.5 in Legacys and in STI? How close are these engines? Are they the same minus compression ratio and turbo, or are they completely different? __________________ STIwish

2004-02-15, 11:18 PM	#2
Nick Koan JDM Cowboy Real Name: Nick Join Date: Oct 2003 Location: Somewhere Posts: 8,642 Car: 2015 Mazda 3	They are relatively the same. I think the only thing difference is that the N/A 2.5 engines don't have forged internals (and a turbo/intercooler, obviously). __________________ While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN

2004-02-15, 11:28 PM	#3
sybir The Don Real Name: Aaron Join Date: Oct 2003 Location: Sacramento Posts: 3,097 Car: '97 Legacy / '05 FXT Class: low	2.5T is a semi-closed deck, as opposed to the open NA motor. Heads are totally different with respect to cams, valves, etc. The 2.5T motors have AVCS (variable valve timing), and there's other stuff, I'm sure..... I dunno if there's any difference in cylinder liners or anything, though. But yeah, forged rods, crank, lower comp pistons, etc... __________________ Tact is for people who aren't witty enough to be sarcastic.

2004-02-16, 01:42 AM	#4
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	I don't know if it bad form to comment on someones sig or not, but... I had to think about Sybir's "Drifting is the automotive equivalent of figure skating. Rallying is playing goalie without a face mask and grinning." and thought it didn't quite fit my mental image. I would liken drifting more to bobsleding, and rally to luging naked while baseball pitchers throw snow/ice balls at you and grinning. __________________ I am a Commodore PET --- Now get off my lawn you kids...

2004-02-16, 02:31 AM	#5
STIwish EJ251 Join Date: May 2003 Location: Ocala, FL Posts: 894	So basically, forget building a turbo legacy unless you're willing to swap correct? __________________ STIwish

2004-02-16, 09:21 AM	#9
BOO EJ205 Join Date: Dec 2002 Location: Reno, Nevada Posts: 2,076 Car: 12+tires Class: Spec. without hard work, nothing grows but weeds	Dude, Just Get an STi :wink: __________________ LOL.. The other White Meat ... lol ------------------------------------------------ subaru(STi) is a boys car, mitsubishi(evo) is a man's car - Jeremy (Top Gear) GC,GD,GM

2004-02-16, 12:20 PM	#10
STIwish EJ251 Join Date: May 2003 Location: Ocala, FL Posts: 894	LOL, will never be able to afford it... but I was asking for a friend about the Legacy. __________________ STIwish

2004-02-16, 12:23 PM	#11
Nick Koan JDM Cowboy Real Name: Nick Join Date: Oct 2003 Location: Somewhere Posts: 8,642 Car: 2015 Mazda 3	You could probably turbo it with low (very low) amounts of boost without doing anything else to the motor. But if you wanted decent boost/power, you'd probably have to add forged internals and maybe get some STi heads. By that point, you're probably pretty close to what a swap would cost. __________________ While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN

2004-02-16, 12:51 PM	#13
STIwish EJ251 Join Date: May 2003 Location: Ocala, FL Posts: 894	Oh, I do say never, but hey, you NEVER know __________________ STIwish

2004-02-16, 06:45 PM	#14
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	For direct comparison sake, the NA Legacy has the same motor that DrFunk is runnig. You can do the exact same things to it. __________________ FWD is the new AWD

2004-02-17, 12:54 PM	#15
drfunk EJ22 Real Name: Sean Join Date: Sep 2003 Location: Ammon,ID Posts: 182 Car: 2003 subi 25rs turbo	im running forcedartech stage one kit at 7 psi and still running close to rich. im also working on an air/water i/c. im having the intake for it fabricated as im writing this..ill have it completed tomorrow and show it off at the meet on thurs.http://www.forcedairtech.com/stage1.htmlalso running vortec FMU. __________________ the beauty of RS-T

2004-02-17, 04:09 PM	#16
drfunk EJ22 Real Name: Sean Join Date: Sep 2003 Location: Ammon,ID Posts: 182 Car: 2003 subi 25rs turbo	ok well my air/water i/c intake will be finished next week. mcvay's had to order 180,45, and 90 degree mandral bends to complete it. they come in on mon and they will finish fabricating on tues. __________________ the beauty of RS-T

2004-02-17, 04:15 PM	#17
MikeSTI EJ205 Join Date: Aug 2003 Location: Reno, NV Posts: 2,354 Car: 2004 STi Class: TSM I can't complain	^^^^ but you'll have it soon :wink: __________________ Cobb Stage 2

2004-02-18, 10:32 AM	#19
dknv EJ207 Join Date: Dec 2002 Location: 39n53, 119w90 Posts: 2,698 Car: RX-8 Class: CS maybe	Last year I went looking for a mandrel bender in Reno, and found none in NNV. The closest place was in Sacramento.

2004-03-02, 08:36 PM	#20
LVSUBARU EJ18 Join Date: Mar 2004 Location: LAS VEGAS Posts: 71	I just got ahold of a STi short block. As far as the block goes the only difference appears to be the semi-closed deck. The pistons look pretty sweet. Nice and dished. __________________ 1993 RS-STi HYBRID, 2000 FORESTER, 2001 RS