Read and Get Information about 2011 Subaru Impreza STI Cosworth CS400, 2011 Subaru Impreza STI Cosworth CS400 Specification, 2011 Subaru Impreza STI Cosworth CS400 Reviews, 2011 Subaru Impreza STI Cosworth CS400 Design, 2011 Subaru Impreza STI Cosworth CS400 pictures and photos, 2011 Subaru Impreza STI Cosworth CS400 price.
The Cosworth-tuned, turbocharged vehicle is one of the world's most accelerative hatchbacks. The renowned 2.5-litre turbocharged 'Boxer' engine is transformed to produce 33 per cent more power, drawing heavily on Cosworth's extensive Formula 1 experience.
The engine, which drives all four wheels via a six-speed manual gearbox, boasts an impressive 400 ps and the new model reaches 62 mph in just 3.7 seconds, going on to cover a quarter mile in 12.75 seconds at a terminal speed of 107 mph.
Top speed is limited to 155mph.As with all Impreza 'Boxer' engines, the STI Cosworth unit features twin overhead camshafts per cylinder bank (DOHC) plus an Active Valve Control System (AVCS) to deliver variable valve timing and enhance low-speed pulling power.
Internal upgrades include high-performance pistons, which are manufactured using the same methods as those employed to create Cosworth's Formula 1 pistons. Special features reduce carbon build-up, minimise friction and reduce weight.
Forged connecting rods are made from high-strength 4340 (EN24) steel and the special Cosworth engine bearings boast a unique combination of design, metallurgy and engineering. Heavy duty cylinder head studs, high-performance multi layered head gaskets and a higher-pressure oil pump are also fitted.
After the in-depth Cosworth performance upgrade which includes an ECU re-map, the boxer engine in the CS400 generates 33 per cent more power (400 ps at 5,750 rpm, compared with 300 ps at 6,000 rpm for the standard Subaru Impreza WRX STI), and 542 Nm of torque, while remaining within the torque capacity design limits of the original Impreza drivetrain.
Manual transmission and All-Wheel Drive system
To handle the increased power of the Cosworth-tuned engine, the Subaru Impreza STI's six-speed manual transmission has carbon synchromesh applied to the top three ratios and a short throw linkage for quicker shifting.
The Subaru Cosworth Impreza's full-time All-Wheel-Drive transmission with front and rear limited-slip differentials, features a 50/50 front to rear torque split as the default, however, the torque split is varied electronically according to changing conditions.
The multi-mode Driver Control centre differential with viscous coupling senses which axle has the better grip and varies the split ratio in milliseconds to distribute torque accordingly, thus maximising traction and minimising the possibility of wheelspin.
Fine-tuned suspension
Improving the Subaru Cosworth Impreza's handling, steering feel and driver feedback - without compromising ride comfort - was a primary target for the development team.
The benefits of this fettling are twofold. Firstly, there is a big improvement in ride quality generally, making the Impreza easier to live with on a day-to-day basis. Secondly, its on-the-limit behaviour is more focused and composed.
The damping upgrades mean that there is less pitch and roll when turning into corners, meaning that keen drivers can get back on the power earlier and make the most of the car's Symmetrical All-Wheel-Drive system.
Upgraded 'racing' brakes enhance stopping power
To match the new Subaru Impreza Cosworth's supercar pace, Cosworth commissioned AP Racing to develop more powerful front brakes. Larger diameter (355 mm) ventilated front discs were adopted, with motorsport-style six-pot callipers featuring bespoke pistons operating on larger brake pads.
TECHNICAL SPECIFICATIONS
- Body and Chassis
- Five-door, five-seat hatchback, with all-steel unitary construction body shell. Longitudinally-mounted petrol boxer engines driving the front and rear wheels (AWD) via a six-speed manual transmission.
- Engine
- STI 2.5-litre / 400 PS
- Name: Subaru Boxer
- Type: DOHC, horizontally opposed 'flat four'
- Capacity: 2.5-litres, 2457 cc
- Bore & Stroke : 99.5 x 79.0 mm
- Compression ratio: 8.2:1
- Max power: 400 PS (295 kW) @ 5,750 rpm
- Max torque: 542 Nm (400 lb.ft) @ 3,950 rpm
- Valves: 16 (4-per-cylinder) with Dual AVCS
- Fuel system: Multi-point injection
- Construction: Aluminium cylinder block and heads
- Emissions class: Euro Stage 5
- Transmission
- Manual: Six-speed
- Gear Ratios
- 1: 3.636:1
- 2: 2.235:1
- 3: 1.590:1
- 4: 1.137:1
- 5: 0.891:1
- 6: 0.707:1
- Reverse: 3.545:1
- Final Drive (rear): 3.900:1
- Drivetrains
- Full-time all-wheel drive with centre differential and viscous coupling, plus Vehicle Dynamics Control, Rear limited-slip differential, Front limited-slip differential and Si-Drive adjustable centre differential
- Suspension & Damping
- Front: Fully independent subframe-mounted MacPherson Struts, with Eibach coil springs and gas-filled Bilstein shock absorbers. Anti-roll stabiliser bar
- Rear: Fully independent subframe-mounted Multi-Link, Eibach coil springs and Bilstein gas-filled shock absorbers (adjustable) anti-roll bar
- Steering
- Type: Electric power-assisted rack & pinion
- Gearing: 2.5 turns lock-to-lock
- Turning circle: 11.0 m
- Brakes
- Front: 355 x 32 mm ventilated discs with 6-pot callipers
- Rear: 316 x 20 mm vented discs with single-pot callipers
- ABS: Four-Channel anti-lock system with EBD
- Wheels & Tyres
- Alloy 18 x 8.5 inch, with 245 / 40 R18 directional tyres
- Dimensions
- Overall length: 4,415 mm
- Overall width: 1,795 mm (excluding door mirrors)
- Overall height: 1,475 mm
- Wheelbase: 2,625 mm
- Front track: 1,530 mm
- Rear track: 1,540 mm
- Ground clearance: 140 mm
- Capacities (all models)
- Fuel tank: 60 litres
- Luggage (VDA)
- 301 litres (rear seats up)
- 1,216 litres (rear seats down)
- Weights
- Curb weight (min.): 1,505 kg
- Gross weight: 1,980 kg
- Performance
- Top speed: 155 mph / 250 km/h (electronically limited)
- 0-62 mph / 0-100 km/h: 3.7 s
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