americans get 2.5 why?
16 May 2003, 10:05 PM
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Base Price: 2004 Subaru Impreza WRX STi - $30,995 / 42,200 € (last update: 4/25/2003)
"No-Compromise" 2004 Impreza WRX STi
Subaru of America, Inc. introduced the long-awaited 2004 Impreza WRX STi, an ultra high-performance all-wheel drive sedan, at the North American International Auto Show. Based on the critically acclaimed Subaru Impreza WRX, Impreza WRX STi is completely re-engineered to provide world-class sports car levels of acceleration, handling and braking performance. Impreza WRX STi will serve as the performance flagship of the Subaru line when it arrives in dealerships this summer and will earn distinction as the most powerful Subaru ever offered for sale in North America.
The Impreza WRX STi draws motorsports technology directly from Subaru expertise in World Rally Championship (WRC) competition, and is designed to appeal to the serious driving enthusiast. Impreza WRX STi is powered by a turbocharged and intercooled 2.5-liter DOHC boxer engine producing 300 horsepower @ 6,000 rpm and 300 lb.-ft. of peak torque @ 4,000 rpm, teamed exclusively to a 6-speed manual transmission. Power is transferred to all four wheels via a sophisticated Subaru All-Wheel Drive system designed to optimize performance in all conditions.
Introducing Subaru Tecnica International (STI)
STI stands for Subaru Tecnica International, the high-performance and motorsports subsidiary of Fuji Heavy Industries Ltd. Subaru, which offers the only exclusively All-Wheel Drive line of passenger cars and crossover-type vehicles in the United States, has been proving the performance and durability of its All-Wheel Drive technology in World Rally Championship competition since 1989.
Until now, STi-badged Subaru vehicles had been available only in select world markets. However, the success of the WRX in the U.S. prompted strong (and vocal) demand from American consumers for an even more extreme-performance version of this car.
As a result, the U.S.-market Impreza WRX STi gives up nothing compared to models offered in Europe, Japan and other markets and in some ways offers more performance. For example, the 2.5-liter turbocharged powerplant is the largest displacement engine ever installed in a WRX STi model and is exclusive to the North American market. This unique engine also provides strong torque characteristics at both low and high rpm.
Rally Tested, Road Ready
"No-Compromise" 2004 Impreza WRX STi
Subaru of America, Inc. introduced the long-awaited 2004 Impreza WRX STi, an ultra high-performance all-wheel drive sedan, at the North American International Auto Show. Based on the critically acclaimed Subaru Impreza WRX, Impreza WRX STi is completely re-engineered to provide world-class sports car levels of acceleration, handling and braking performance. Impreza WRX STi will serve as the performance flagship of the Subaru line when it arrives in dealerships this summer and will earn distinction as the most powerful Subaru ever offered for sale in North America.
The Impreza WRX STi draws motorsports technology directly from Subaru expertise in World Rally Championship (WRC) competition, and is designed to appeal to the serious driving enthusiast. Impreza WRX STi is powered by a turbocharged and intercooled 2.5-liter DOHC boxer engine producing 300 horsepower @ 6,000 rpm and 300 lb.-ft. of peak torque @ 4,000 rpm, teamed exclusively to a 6-speed manual transmission. Power is transferred to all four wheels via a sophisticated Subaru All-Wheel Drive system designed to optimize performance in all conditions.
Introducing Subaru Tecnica International (STI)
STI stands for Subaru Tecnica International, the high-performance and motorsports subsidiary of Fuji Heavy Industries Ltd. Subaru, which offers the only exclusively All-Wheel Drive line of passenger cars and crossover-type vehicles in the United States, has been proving the performance and durability of its All-Wheel Drive technology in World Rally Championship competition since 1989.
Until now, STi-badged Subaru vehicles had been available only in select world markets. However, the success of the WRX in the U.S. prompted strong (and vocal) demand from American consumers for an even more extreme-performance version of this car.
As a result, the U.S.-market Impreza WRX STi gives up nothing compared to models offered in Europe, Japan and other markets and in some ways offers more performance. For example, the 2.5-liter turbocharged powerplant is the largest displacement engine ever installed in a WRX STi model and is exclusive to the North American market. This unique engine also provides strong torque characteristics at both low and high rpm.
Rally Tested, Road Ready
17 May 2003, 09:01 AM
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think you will find that the emmission laws over there prevent high tuning from the factory so they had to redesign the engine to a bigger displacment to make up for the lack of power...
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17 May 2003, 03:19 PM
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I read an article about a guy who's put a 2.5 i his STI Type R. He's had to build his own gearbox from a mixture of staight cut and semi helical (is that the word!?!) gears to handle the torque. Seems a wicked idea.
17 May 2003, 03:57 PM
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AFAIK, if you look at the output figures for the US STI and the UK STI + PPP then they are virtually identical, although undoubtedly the nature of the engines will differ.
I have always presumed that the PPP was how the Impreza (whether WRX or STI) is 'meant' to be but released as an option to circum-navigate rules and regs.
From what I have read too, the US engine's output is to do with rules and regs.
So the way I see it, it is just two methods of producing the same ultimate package.
No expert, just my take on things.
I have always presumed that the PPP was how the Impreza (whether WRX or STI) is 'meant' to be but released as an option to circum-navigate rules and regs.
From what I have read too, the US engine's output is to do with rules and regs.
So the way I see it, it is just two methods of producing the same ultimate package.
No expert, just my take on things.
18 May 2003, 05:42 AM
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Well, as my first post to this board, and seeing as im an ex-pat living in America, i can answer this one completely.
Basically, Americans are used to fat **** V8's, like my 5.7 V8 chevy 4x4, (11mpg!!) which have a **** load of torque low down in the rev range.
The displacement was increased to 2.5 litres for the STI to give that lower torque. Cos basically 99.9% of yanks dont know how to operate a "stick" transmission and change at 1500rpm.
I am dissapointed though, that my first brand new car, WRX, is a lame version, sanitized for the American market. Is yours 227bhp? I cant remember, ive lived here for 2 years now, things are fading.
Well i hope to get to know you guys, im looking for UK spec tuning stuff, as the US aftermarket parts are not what you would call exciting. Remember, the WRX has only been here for 2 years, i got one of the first 2002 estates, so stuff is basic.
Basically, Americans are used to fat **** V8's, like my 5.7 V8 chevy 4x4, (11mpg!!) which have a **** load of torque low down in the rev range.
The displacement was increased to 2.5 litres for the STI to give that lower torque. Cos basically 99.9% of yanks dont know how to operate a "stick" transmission and change at 1500rpm.
I am dissapointed though, that my first brand new car, WRX, is a lame version, sanitized for the American market. Is yours 227bhp? I cant remember, ive lived here for 2 years now, things are fading.
Well i hope to get to know you guys, im looking for UK spec tuning stuff, as the US aftermarket parts are not what you would call exciting. Remember, the WRX has only been here for 2 years, i got one of the first 2002 estates, so stuff is basic.
19 May 2003, 03:40 AM
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Another Ex-Pat. The 2.5 is simply to help with emissions. Also the US Sti weighs in at about 3263lbs which makes it a little porky. Subaru felt they needed something to top the EVO V111 which has been on sale in the US since March for $28,000. The WRX has been very successful in the US selling about 20,000 units per year. They wanted to seriously differentiate from the WRX. The Sti in the US is only running 14.5psi of boost so it has some serious tuning potential. Prodrive are already designing a PPP kit for the US Sti. I believe all the Sti's in the world will be 2.5 in a year or two.
On the octane issue here is some insight. The US really doesn't have that bad an octane situation. US fuel is octane rated using this formula:
RON (Research Octane Number)+MON (Motor Octane Number)/2
US Super Unleaded Octane rating is actually 98 RON. This is no matter whether the final number is 93, 94 or 91 in different parts of the country. However they will have an effect on performance.
Compare this to the 95 RON that the UK gets, the US is in fact right in the middle.
However having said all that, in California 91 octane is the best you can get which has caused some constenation amoung the EVO boys who have been dynoing their EVO V111's and finding they are about 20hp down on power. I don't think the Sti will be as susceptible due to the lower level of tune.
On the octane issue here is some insight. The US really doesn't have that bad an octane situation. US fuel is octane rated using this formula:
RON (Research Octane Number)+MON (Motor Octane Number)/2
US Super Unleaded Octane rating is actually 98 RON. This is no matter whether the final number is 93, 94 or 91 in different parts of the country. However they will have an effect on performance.
Compare this to the 95 RON that the UK gets, the US is in fact right in the middle.
However having said all that, in California 91 octane is the best you can get which has caused some constenation amoung the EVO boys who have been dynoing their EVO V111's and finding they are about 20hp down on power. I don't think the Sti will be as susceptible due to the lower level of tune.
19 May 2003, 04:38 AM
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Hey Thomo, thanks for the help. Im sure i'll be asking lots of questions.
Good to see im not the only Brit around these parts. I agree with what you are saying about the 2.5, but even with the extra displacement, the STI is still not quite as quick as the Evo from what ive read. The lower state of tune of the STI will be well easy to play with and absolutly spank the EVO. I mean that thing is running 19psi standard with a FMIC. Where do you go from there with out spending a fortune? Any way, as i said, the cars are new to the US, the parts arnt yet up to scratch yet in my opinion. Plus i want a touch of home in my ride.
Good to see im not the only Brit around these parts. I agree with what you are saying about the 2.5, but even with the extra displacement, the STI is still not quite as quick as the Evo from what ive read. The lower state of tune of the STI will be well easy to play with and absolutly spank the EVO. I mean that thing is running 19psi standard with a FMIC. Where do you go from there with out spending a fortune? Any way, as i said, the cars are new to the US, the parts arnt yet up to scratch yet in my opinion. Plus i want a touch of home in my ride.
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