Legacy Sedan GT 2.5
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Legacy Sedan GT 2.5
Help!
Can anyone tell me the last year after 1999 the Subaru 2.5 Litre engine came with DOHCs? As I understand, from 2002 through 2004 they came with SOHCs. The 2005 apparently will have a 3.0 litre DOHC six cylinder engine.
I have twin 1997 Legacy Sedans GT with the 2.5 litre DOHC engines, and in addition am looking to buy another one, either a 2000, or 2001 Legacy GT with the 2.5 litre DOHC engine. If 1999 was the last year, then I will settle for that year.
Please correct me if I'm wrong on any of this. Thanks
Soybean in Albuquerque
Can anyone tell me the last year after 1999 the Subaru 2.5 Litre engine came with DOHCs? As I understand, from 2002 through 2004 they came with SOHCs. The 2005 apparently will have a 3.0 litre DOHC six cylinder engine.
I have twin 1997 Legacy Sedans GT with the 2.5 litre DOHC engines, and in addition am looking to buy another one, either a 2000, or 2001 Legacy GT with the 2.5 litre DOHC engine. If 1999 was the last year, then I will settle for that year.
Please correct me if I'm wrong on any of this. Thanks
Soybean in Albuquerque
Registered User
Joined: Aug 2004
Posts: 50
From: Berlin, Ct
2005 Legacy 2.5 GT.<--2.5 liter- flat 4
The 3.0 V6 is in the Outback 3.0 R sedan
3.0-liter DOHC aluminum-alloy 24-valve 6-cylinder horizontally opposed Subaru Boxer engine with Active Valve Control System (AVCS) and Active Valve Lift System (AVLS). Iridium spark plugs.
The 3.0 V6 is in the Outback 3.0 R sedan
3.0-liter DOHC aluminum-alloy 24-valve 6-cylinder horizontally opposed Subaru Boxer engine with Active Valve Control System (AVCS) and Active Valve Lift System (AVLS). Iridium spark plugs.
Registered User
Joined: Nov 2002
Posts: 450
From: Utah
Car Info: 2000 Leg GT LTD
The US model Legacy was DOHC from 96-99. The SOHC engine in the 20002004 model was rated at the same horsepower, but had a far better torque curve.
The 2005 is still available with the same SOHC engine as the 04, with minor updates.
The 2005 is still available with the same SOHC engine as the 04, with minor updates.
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Thank you, DLC, and Legacy05GT
If the SOHC has a better torque curve, I am assuming then that "better" means a better or even distribution of torque (foot-pounds) throughout the 0 to 4000 rpm range and peaking at 162 ft-lbs on or about 4000 rpm. I prefer more torque at lower rpms so I can access the murderous beltways and freeways, but I don't want the power plant to crap out on me when passing at 45 to 65 mph. Did Subaru engineers and Corporate management decide to drop the DOHC inf favor of the SOHC from 2000 to 2004 because of a better torque curve or because it cost less or for yet other reasons. Does anyone know? DLC, do you have any data on the SOHC torque curve as compared to the DOHC? Also, can anyone elaborate on any performance advantages the DOHC 2.5 L power plant has over the SOHC 2.5 L power plant?
Soybean
If the SOHC has a better torque curve, I am assuming then that "better" means a better or even distribution of torque (foot-pounds) throughout the 0 to 4000 rpm range and peaking at 162 ft-lbs on or about 4000 rpm. I prefer more torque at lower rpms so I can access the murderous beltways and freeways, but I don't want the power plant to crap out on me when passing at 45 to 65 mph. Did Subaru engineers and Corporate management decide to drop the DOHC inf favor of the SOHC from 2000 to 2004 because of a better torque curve or because it cost less or for yet other reasons. Does anyone know? DLC, do you have any data on the SOHC torque curve as compared to the DOHC? Also, can anyone elaborate on any performance advantages the DOHC 2.5 L power plant has over the SOHC 2.5 L power plant?
Soybean
Registered User
Joined: Nov 2002
Posts: 450
From: Utah
Car Info: 2000 Leg GT LTD
I think they went SOHC because it was cheaper, and they found that with a little work, they could make better torque.
Here's a link to a NASIOC thread with a dyno graph:
http://forums.nasioc.com/forums/showthread.php?t=154832
It's hard to read, but you get the idea. Patrick Olsen is a long-time Legacy guy who drives a 97GT and has done a lot of work to it. I've seen him mention how much better the SOHC torque is on many occasions.
The DOHC should be able to rev higher, if you can get around the limiter, but to get any power above redline it's going to take a lot of work and tuning.
Here's a link to a NASIOC thread with a dyno graph:
http://forums.nasioc.com/forums/showthread.php?t=154832
It's hard to read, but you get the idea. Patrick Olsen is a long-time Legacy guy who drives a 97GT and has done a lot of work to it. I've seen him mention how much better the SOHC torque is on many occasions.
The DOHC should be able to rev higher, if you can get around the limiter, but to get any power above redline it's going to take a lot of work and tuning.
Guest
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DLC thanks.
The low reading of peak torque is probably due to the high mileage engines. Changing from DOHC to SOHC because of less cost would also be my guess. I made a print of the graph - very telling. I estimate the SOHC did about 9 per cent better than the DOHC on the average through midrange. But it looks like the DOHC keeps on making power long after the SOHC is done. I like the DOHC considerably better because its higher performance potential, and also the wider heads are more impressive visually. Reminds me of the monstrous 426 Hemi of old.
Soybean
The low reading of peak torque is probably due to the high mileage engines. Changing from DOHC to SOHC because of less cost would also be my guess. I made a print of the graph - very telling. I estimate the SOHC did about 9 per cent better than the DOHC on the average through midrange. But it looks like the DOHC keeps on making power long after the SOHC is done. I like the DOHC considerably better because its higher performance potential, and also the wider heads are more impressive visually. Reminds me of the monstrous 426 Hemi of old.
Soybean
Registered User
Joined: Nov 2002
Posts: 71
From: Anchorage, AK
There was also a hybrid of a few if I remember correctly. which might be worth looking at. I recalled either they were late 99 models or early 2000 models, but they had DOHC but also had the phase II block. Potentially best of both worlds? I dunno. Phase II blocks were the ones used for the SOHC's of the 2k+ years IIRC.
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AKSubie,
How do you like living in Anchorage? I lived at Fort Richardson for two years, courtesy of Uncle Sam.
I assume you own a AW Subaru which is great in a place that actually gets snow that stays! Here in Albuquerque, we see it and now we don't, November thru March, but only about once or twice, and some years never. My 97 Legacy GT Sedans do quite well here too.
I'm looking at the new 2005 DOHC Legacy GT Sedans and am impressed. I understand shifting to "Sport" enables shifting with the buttons on the steering wheel (for automatic tranny equipped cars). What the heck is this!!!! I do like the single turbo and the resultant 250 HP rating however, but could do without heated mirrors, and seats, and individual temp control settings for his and hers - yuk, yuk. The twin tail exhausts look great, but sad to see they don't go all the way up to the exhaust manifolds - instead one pipe connects the two right into the turbo and out in one pipe which then splits into the twin tail pipes. Twin turbos would be a dream, then, we could have a genuine dual exhaust system in a Subaru.
Soybean
How do you like living in Anchorage? I lived at Fort Richardson for two years, courtesy of Uncle Sam.
I assume you own a AW Subaru which is great in a place that actually gets snow that stays! Here in Albuquerque, we see it and now we don't, November thru March, but only about once or twice, and some years never. My 97 Legacy GT Sedans do quite well here too.
I'm looking at the new 2005 DOHC Legacy GT Sedans and am impressed. I understand shifting to "Sport" enables shifting with the buttons on the steering wheel (for automatic tranny equipped cars). What the heck is this!!!! I do like the single turbo and the resultant 250 HP rating however, but could do without heated mirrors, and seats, and individual temp control settings for his and hers - yuk, yuk. The twin tail exhausts look great, but sad to see they don't go all the way up to the exhaust manifolds - instead one pipe connects the two right into the turbo and out in one pipe which then splits into the twin tail pipes. Twin turbos would be a dream, then, we could have a genuine dual exhaust system in a Subaru.
Soybean
Registered User
Joined: Nov 2002
Posts: 71
From: Anchorage, AK
It's not too bad up here, Anchorage is more non-alaskan than the rest of AK. I have been enjoyign the mild summers, and the snow, but the inbetween times suck. That and because many people move up from TX, NY, VT, etc...ALL those driving styles try to mesh in a town that is about 20 square miles makes for headaches LOL.... If you were here you understand probably.
I had owned a Subie, a 2k Legacy GT. There are pictures of it floating around here or on Nabisco. long story short, I was contemplating going turbo, ven as far as getting a JDM hood. in the process ran across an S4 for a steal, decided to try it. Although now I am thinking of coming back and getting a Legacy GT again, (new turbo one) haven't driven one yet, although everyoen says if I do it'll convert me right back. LOL. Yeah, myself and my friend Ben noticed that too when we went to Squarebanks to check them out when they were cold weather testing. (spyshots and such
)
I had owned a Subie, a 2k Legacy GT. There are pictures of it floating around here or on Nabisco. long story short, I was contemplating going turbo, ven as far as getting a JDM hood. in the process ran across an S4 for a steal, decided to try it. Although now I am thinking of coming back and getting a Legacy GT again, (new turbo one) haven't driven one yet, although everyoen says if I do it'll convert me right back. LOL. Yeah, myself and my friend Ben noticed that too when we went to Squarebanks to check them out when they were cold weather testing. (spyshots and such
)
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Joined: Apr 2003
Posts: 104
From: SEPA
Car Info: '98 Neon R/T
Originally Posted by soybean
AKSubie,
Twin turbos would be a dream, then, we could have a genuine dual exhaust system in a Subaru.
Soybean
Twin turbos would be a dream, then, we could have a genuine dual exhaust system in a Subaru.
Soybean
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Posts: n/a
The SOHC motors are better than the DOHC motors by more than a little bit for your use. They would actualy be better for Motorsports use too if you did them right. Lower rotating mass and less over all mass by a good bit. You can still run stupid lumpy cams on a SOHC.
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