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Subaru Rally Team USA unveiled its new 2011 Impreza WRX STI rally cars to journalists in dramatic fashion at the Pala Raceway in Pala, California. The team provided full speed ride-alongs to journalists during practice for the ESPN Summer X Games 16. Travis Pastrana, Dave Mirra and new teammate, European Rallycross Champion Sverre Isachsen, demonstrated that they were ready for the SuperRally X Game competitions, being held at the Los Angeles Coliseum on Saturday, July 31st.

“The team has worked very hard to get these vehicles ready for the X Games,” said Pastrana. “The competition is going to be tough but I am confident that our STIs will be the cars to beat.”

The team’s technical partner, Vermont SportsCar, first began with a stock 2011 Subaru Impreza WRX STI right off the showroom floor. The car’s interior was then stripped bare and the shell lightened then fully seam welded for added strength. A multipoint roll cage, manufactured from T45 steel, was then welded into place.

Major differences from the stock STI include the addition of a competition fuel cell — which keeps race fuel contained within a flexible Kevlar bag tank — and lightweight carbon/Kevlar RECARO SPA ProRacer competition seats (w/HANS- Head and Neck Restraint System). Other interior additions include a custom STI dashboard, carbon fiber door panels, a Coralba C-Giant Rally Odometer, and an onboard Fire Suppression System.

The stock dampers are swapped out for heavy-duty rally dampers made by EXE-TC competition suspension. The rally dampers are fully adjustable and are built to take the abuse that off-road gravel rallying entails. Under the hood sits a 2.0-liter, 4-cylinder, turbocharged and intercooled STI engine running VP Racing fuel and producing in excess of 500 horsepower and 560 lb/ft of torque (running with 45mm restrictor for X Games). The clutch is a high performance-racing clutch provided by EXedy. Launch control, a turbo anti-lag system and a hydraulic handbrake are just a few of the features at the driver’s disposal.

A 5-speed, close-ratio dog-engagement gearbox is used, which allows Subaru Rally Team USA drivers to shift without depressing the clutch. The DCCD (Driver Controlled Center Differential) is similar to the system in a stock STI street car, but with a competition ECU for the differential, which allows for greater control of the torque delivery between all four wheels.

The exterior of the car remains close to stock, with the simple addition of mud flaps and a 1/4-inch aluminum skid plate. A roof-mounted carbon fiber air scoop aids in cooling the cockpit and the stock rear wing is replaced with a larger vertically slotted wing, which greatly improves down force to the rear of the car, even as it slides sideways. Lastly, auxiliary HID driving lights, made by Vision-X and housed in carbon fiber light pod, are fitted for night rallying.

“Learning a new car can be a challenge,” Isachsen said, “but having seen the result of the Subaru team’s preparations and practiced in my STI, I am very much looking forward to driving in the X Games SuperRally. Though the ERC (European Rally Championship) is somewhat different from SuperRally, I think my experience will place me in a competitive position for this event.”

The SRT USA will again compete in the Rally Car competition, which they have won 9 out of the 13 possible medals in the past 4 years. The event features two rally cars at a time running on a stadium based parallel course. New for this year X Games will debut SuperRally, which is based on the European Rallycross. SuperRally features direct head-to-head competition with four cars at a time on a tight dirt course within the massive LA Coliseum, in downtown Los Angeles. The new format should prove especially exciting for America fans as the rally cars will bump, jump and slide together in a furious sprint of just a few short laps.

Subaru.com/Rally will post daily updates on the progress of Subaru Rally Team USA throughout X Games weekend.

Subaru Australia has announced that the Symmetrical All-Wheel Drive Model Year 2011 Impreza WRX STI will be available for the first time with the choice of an automatic transmission.

Following on from the news that sedan variants are to be reintroduced to the range, Nick Senior, Managing Director, Subaru Australia, said: “We can now confirm that the revised sedan and hatchback Impreza WRX STIs will add the option of a five-speed automatic transmission. “We’ve had increasing enquires about an auto over the last two years and we’re delighted to be able to deliver what a significant number of customers have requested.”

Mr Senior said the transmission would reflect the performance and engineering values of STI to produce a “fantastic driver’s car that will expand its appeal to a wider audience.”

Impreza WRX STIs will also continue to be available with a six-speed manual transmission.

Unveiled at the New York International Auto Show this year, revised Impreza WRX STI sedan and hatch are due on sale during the last quarter of 2010. Subaru STI specialist retailers are now taking orders.

Pricing and full specifications will be announced at launch time.

Fuji Heavy Industries Ltd. (FHI), the manufacturer of Subaru automobiles, today released footage covering an advanced research and development project carried out at the Nurburgring’s racetrack in Germany, using a 2011MY Subaru WRX STI 4-door (sedan) test vehicle. Subaru has been using the world’s toughest Nordschleife course since 1992 for advanced R & D as well as tests of the WRX and WRX STI models. The movie uploaded on the Subaru Global Site http://www.subaru-global.com/home.html features this year’s challenge. It is presented as a highlight of Subaru’s persistent effort to stretch vehicle performance to unprecedented levels.

The concept of the 2011MY WRX STI is “The Fastest WRX STI Ever”. At Subaru, the phrase “Fastest” refers to more than just top speed or maximum engine output. It implies driving with confidence. The WRX STI can only be taken to its “fastest ever” performance when it provides the driver with total driving control with confidence. Major upgrades to the 2011MY WRX STI focused on the chassis and suspension set-up. Tests at the Nurburgring demonstrated the supreme overall dynamics and linear behavior. Tommi Mäkinen, the legendary four-time World Rally Champion, piloted the test vehicle for the challenge. He commented, “The car was controllable with precise and faithful handling even on tricky corners. I could easily predict the car’s behavior. That is exactly what Subaru is offering, confidence”. As a result, the 2011MY WRX STI test vehicle recorded 7’55’’00, Subaru’s fastest lap time ever, which is 4 seconds faster than the previous fastest time recorded in 2004. The 2011MY WRX STI 4-door will go on sale world-wide from this summer. Upgrades to the 4-door version will be carried over to the 5-door (hatchback) model.

Subaru WRX STI

Since its introduction in 1994, the continuous evolution and development of the WRX STI is propelled by the strong support and expectations of thousands of enthusiastic customers and motorsports fans all over the world. These loyal customers strongly support Subaru’s fun-to-drive compact vehicle with superb performance through its unique power train, and unique combination of turbo-charged Horizontally-Opposed Boxer engine and Symmetrical All-Wheel-Drive (AWD) system.

Subaru persists in its philosophy of developing the ultimate driver’s car and embodying the essence of total driving control, from ordinary to extreme driving conditions. The Symmetrical AWD is the core technology to enhance such values in Subaru vehicles. With this philosophy in mind, Subaru’s performance icon, the WRX STI, received a full model change in 2007 to boast not only higher and exhilarating performance but also handling control. The controlled manner and accurate handling response will provide full confidence to the driver in all driving conditions. Even the most demanding drivers will feel they own an extraordinary driving machine. As Subaru’s performance flagship, the WRX STI defines Subaru’s view of AWD Sport.

Concept of 2011MY WRX STI

Based on the concept of “The Fastest WRX STI Ever”, the 2011MY was developed to deliver the maximum performance. Since the first generation WRX STI, the model has been developed to enhance its superior high performance with safety in all road conditions. The 2011MY WRX STI was tested to further refine its nature of a performance car in specific and severe conditions and on the circuits as well, including the Nurburgring racetrack. At Subaru, the phrase “Fastest” does not simply refer to the maximum top speed or engine output. It must come from the confidence a driver can get even on the limit. That confidence is derived from the linearity of the vehicle response to a driver’s input. The enhanced suspension improves precise handling and stability, offering predictable vehicle characteristics. Consequently, the 2011MY WRX STI delivers evolved total driving control in addition to ultra high performance.

Key enhancement for 2011MY

The 2011MY WRX STI further refined its “total driving control” ability by totally reviewed suspension system and lowered overall height. That enables drivers to control the car according to their intentions with improved, superior handling performance. Road holding capability was also improved, thus the driver can drive the car with complete trust in its cornering performance at high speed. In order to maximize the on-road performance, the 4-door sedan version was newly added in the line-up from the 2011MY. Its wide and low shape and large rear spoiler will surely appeal to enthusiasts.

For 2011MY, the overall suspension setup was revised to further improve accuracy and handling response, maneuverability, and road holding capability. In the front suspension, the rear-end arm bushes were changed to a pillow-ball type which is first ever adopted in the Subaru production models. This drastically improves toe stiffness as well as lateral stiffness in order to provide its evolved handling performance that is even more faithful to the driver’s steering control. The specifications of the sub-frame bushings of the rear suspension were also changed to improve toe and camber stiffness, resulting in increased vehicle responsiveness and road hugging capability. Specialized tuning of the damping force of both front and rear dampers provides secure road-holding ability. Changes to specifications of the front and rear coil springs, and stabilizers greatly improve roll stiffness. Due to those suspension refinements, the vehicle height was decreased by 5 mm for lower center of gravity to increase maximum lateral-G.

Nurburgring for Subaru

Subaru has a history of advanced research and development at the Nurburgring. Its constant challenges started in late 1980’s for the evaluation test of suspensions and tyres for the first generation Legacy. In 1992 Subaru first tested the Impreza WRX there. Since then, the Impreza WRX STI test vehicles have been running the 20.8 km (12.9 miles) Nordschleife course in the Nurburgring, which is well known as the most difficult racetrack in the world with more than 160 turns, and with 300 m (984 ft.) difference in altitude. The Nurburgring is a toughest yet ultimate proving ground for all the auto manufacturers. As Subaru understands that all road conditions around the world are condensed in this racetrack, it has chosen the Nurburgring for many years in the development of the WRX STI in order to offer sheer excitement and unique driving feeling as a distinctive “Road Sport Model”. Fastest driving at the track requires a totally-balanced superior vehicle performance. Testing the vehicle at the Nurburgring also proves Subaru’s distinctive performance underpinned by its consistent development philosophy: Subaru pursues enjoyable, reliable, safe and secure driving with high performance. And that will certainly lead to driving with confidence.

History of development

The first challenge took place with the Impreza WRX test vehicle in 1992. Subaru engineers were all stunned at the severe characteristics of the course. The front part of the vehicle was heavily stressed especially on severe ups and downs. Subaru engineers fully realized insufficient abilities of brakes and suspensions, and learned the importance of further enhancement of the rigidity of the front. The vehicle, nevertheless, marked a lap time at 8’28’’93, thanks to its light weight body and excellent stability by Subaru’s authentic Symmetrical AWD system.

After the first introduction of WRX STI version in 1994, the test vehicle of WRX STI version III was tested at the course in 1996, marking 8’10’’75, 18 seconds faster than the 1992 recorded time. The engine output was increased with improved turbo charger and inter-cooler. To meet higher engine output, the transmission and brake system were also refined. Especially 4-piston front and 2-piston rear brake calipers were newly adopted, on the basis of the past testing experiences at the track. This enhancement of brake system eventually led to the adoption of brembo brake system.

The second generation WRX STI, introduced in 2000, featured new items which further enhanced driving performance: 225/45ZR17 tyres, 6-speed manual transmission, new engine with variable valve timing control mechanisms and brembo brake system. The model also dramatically improved its body rigidity to enhance collision safety performance. However, this resulted in the weight increase and the lap time of this model did not meet Subaru’s expectations.

In 2002 the WRX STI received a face-lift with superior aerodynamics, a finely-managed AWD system and new engine performance. The equal-length exhaust and Subaru’s first twin-scroll turbocharger increased the maximum output and torque. The newly-adopted auto mode in driver’s control center differential system optimizes torque distributions between front and rear axles. Thanks to those advanced technologies, this test vehicle recorded 8’06’’59.

The WRX STI evolved again in 2004. Wheel hubs, rims and tyre width were enlarged. Helical type was newly adopted in the front limited slip differential gear to improve stability at cornering. An undercover helped improvement of aerodynamics. Enlarged inter-cooler increased maximum torque. Mainly due to the enhancement of chassis performance, the test vehicle finally broke the 8-minute barrier at 7’59’’41.

The third generation WRX STI was redesigned in 2007. One of big topics in this model was the adoption of the totally new chassis system, “Subaru Dynamic Chassis Control Concept”. Newly developed double wishbone rear suspension offered superior road-holding ability by optimizing the geometry, including toe and camber angles and by regulating the lift motion. Subaru opted for the new 5-door package with a clear vision of what package is most appropriate to be competitive in the rally field, and what Subaru believes the ideal road sports car should be. Three key elements, “traction”, “response” and “stability”, were enhanced by its new chassis and package. Rainy conditions made the tests incomplete for the lap time comparable to the previous records.

The 2010 Challenge

Development of the 2011MY WRX STI focused on improved dynamics and precise handling with every aspect tested under extreme operating conditions including the toughest Nurburgring racetrack. To prove the development concept, “The Fastest WRX STI Ever”, Subaru chose the new 4-door sedan body for 2010 testing. Based on the 2011MY model, some potential future model items were added to this test vehicle, since Subaru positioned this challenge as one of stages in advanced research and development. Subaru evaluated the model’s performance, considering future product planning of the WRX STI.

The final challenge took place in April at the Nordschleife course. Subaru believes suspension performance is essential for high speed cornering with confidence. Therefore, the refinement of suspensions and chassis were mainly focused on this challenge as well as the development of 2011MY WRX STI. During testing, the car showed faster cornering speed. As a result, the test vehicle recorded 7’55’’00, the fastest lap time ever recorded in a Subaru, proving its development concept, “The Faster WRX STI Ever”.

Subaru is fully committed to offer enjoyable, reliable and exciting driving with confidence to customers in its vehicle development philosophy. The aim of using the Nurburgring for Subaru is not to mark the fastest lap time but to develop vehicles that customers can drive faster yet safely with confidence even under extreme road conditions as typified by the Nurburgring. Further refined suspensions and new sedan body of the 2011MY WRX STI contributed much to this result, and this learning was accurately fed back to the production models.

Ideal driving on the Nurburgring racetrack is beyond measure by figures. It relies on experience and inspiration by the driver, too. “The 2011MY WRX STI test car balances excellent stability and handling performance at a high level, thanks to its refined suspensions”, explained Tommi Makinen. The legendary four-time World Rally Champion piloted the car. He has also been a longtime supporter of Subaru since he took the first driver’s seat of Subaru World Rally Team in 2002. “The car was really controllable with precise and faithful handling even on tricky corners. I could easily predict a next behavior of the car, that is, I confirmed its evolved total driving control ability. Subaru’s renowned Symmetrical AWD system also greatly contributed to this performance. The outstanding achievement is not only a tribute to Subaru’s continued and earnest efforts, but also an evidence of confidence in driving a Subaru”.

For Subaru, the Nurburgring has been a place for self-discipline in its vehicle development. Subaru believes “Persistency is Power” and will continue to use the track to further pursue the development of vehicles which provides emotion, excitement and confidence to customers.

Major specifications of 2011MY WRX STI test vehicle:
- Overall length X width X height; 4,580 X 1,795 X 1,470 mm
- Wheelbase; 2,625 mm
- Engine type; Horizontally-Opposed 4-cylinder DOHC 16-valve turbocharged engine
- Displacement; 1,994 cc
- Transmission; 6 speed manual transmission
- Tyres; 245/40 R18
Major added features to the test vehicle
*R205 is a special edition for Japan market.
- Bigger turbocharger
- 6-pot brake calipers
- Flexible tower bar
- Front lip spoiler
*spec C is a special edition for Japan market.
- Bridgestone Potenza RE070 tyres
- Aluminum hood

- Full-bucket seat
- Roll cage
- 5-point safety belts

- Under cover
- Aluminum fenders

German and japan Four wheel drive battle, including: Audi TTRS, VW Golf R, Subaru Impreza WRX STI R205, Subaru Impreza WRX STI Spec C, Subaru Impreza WRX STI A-Line, Mitsubishi Lancer EvoX Ralliart, Mitsubishi Lancer EvoX GSR (SST); and add 2 more FF models have been choose is VW Scirocco R amd Honda Civic Type-R (FD2). This car will battle in a test of 0-400m straight line acceleration, and then divided according to engine power “300ps below” and “300ps above” the two groups for the Tsukuba 5 lap battle, Enjoy it!

2010 Audi TTRS Coupe
2.5L turbo direct 5 / 6MT / 4WD / 340ps@5,400~6,500 rpm / 450Nm@1,600~5,300 rpm
0-100km/h:4.6s / 0-200km/h:na / speed:250km/h(electronically limited)

2010 Volkswagen GOLF R
Turbocharged 2.0L straight 4 / 6 DSG / 4WD / 270ps@6,000 rpm / 350Nm@2,500~5,000 rpm
0-100km/h:5.5s / 0-200km/h:na / speed:250km/h(electronically limited)

2010 Volkswagen Scirocco R
Turbocharged 2.0L straight 4 / 6 DSG / FF / 256ps@6,000 rpm / 330Nm@2,400~5,200 rpm
0-100km/h:6.4s / 0-200km/h:na / speed:250km/h(electronically limited)

2010 Subaru Impreza WRX STI R205
2.0L F4 turbo / 6MT / 4WD / 320ps@6,400 rpm / 431Nm@4,000 rpm
0-100km/h:4.5s / 0-200km/h:na / speed:250km/h

2010 Subaru Impreza WRX STI Spec.C
2.0L F4 turbo / 6MT / 4WD / 308ps@6,400 rpm / 422Nm@4,400 rpm
0-100km/h:4.8s / 0-200km/h:na / speed:250km/h

2010 Subaru Impreza WRX STI A-Line
2.5L F4 turbo / 5AT / 4WD / 300ps@6,200 rpm / 350Nm@2,800~6,000 rpm
0-100km/h:5.2s / 0-200km/h:na / speed:245km/h+

Mitsubishi Lancer Evo.X Ralliart
Turbocharged 2.0L straight 4 / 5MT / 4WD / 300ps@6,500 rpm / 422Nm@3,500 rpm
0-100km/h:4.5s / 0-200km/h:na / speed:250km/h

Mitsubishi Lancer Evo.X GSR (SST)
Turbocharged 2.0L straight 4 / 6 SST / 4WD / 280ps@6,500 rpm / 422Nm@3,500 rpm
0-100km/h:5.2s / 0-200km/h:na / speed:250km/h

Nissan Fairlady Version Z Nismo
3.7L V6 naturally aspirated / 6MT / FR / 355ps@7,400 rpm / 373Nm@5,200 rpm
0-100km/h:4.7s / 0-200km/h:na / speed:250km/h+

Honda Civic Type-R FD2
Naturally aspirated 2.0L straight 4 / 6MT / FF / 225ps@8,000 rpm / 238Nm@6,000 rpm
0-100km/h:na / 0-200km/h:na / speed:225km/h+

From April Subaru’s highly acclaimed Impreza WRX and STI Type UKwill be offered with complimentary optional upgrades worth over £3,200 at participating dealers. The free items include the Prodrive Performance Pack, which further improves acceleration *, and stylish new 18-inch alloy wheels and tyres.

The Performance Packs, developed in conjunction with Banbury-based tuning experts, Prodrive, adds a reconfigured ECU and high-flow sports exhaust to the Impreza’s already impressive performance arsenal. The 18-inch alloy wheels, meanwhile, give the car a more aggressive, purposeful stance and improve handling and grip.

As if the prospect of this extra equipment wasn’t tantalising enough, the Japanese firm has reduced the retail price of the All-Wheel Drive WRX by £95.

Subaru UK Marketing Director, Kenyon Neads, said: “With this offer we’ve added even more value into the Impreza equation. The WRX and STI are performance-car icons with a seriously loyal following and we hope that the prospect of these free upgrades will broaden their appeal still further.”

* 0-62mph acceleration figures:
- Impreza WRX (standard car): 6.5 seconds
- Impreza WRX (with Prodrive Performance Pack): 5.9 seconds
- Impreza STI Type UK (standard car): 5.2 seconds
- Impreza STI Type UK (with Prodrive Performance Pack): 4.8 seconds