The Vauxhall Signum, particularly the facelifted version introduced in 2005, represents a unique offering from the British automaker. Positioned as a hatchback – though often described as a ‘sports hatch’ – the Signum aimed to blend the practicality of a family car with a more dynamic driving experience. While never officially sold in the United States, the Signum was a significant model for Vauxhall (and its sister brand Opel) in Europe, competing with vehicles like the Ford Mondeo and Volkswagen Passat. The 2005 facelift brought styling revisions and powertrain refinements, including the 2.8i V6 Turbo ECOTEC engine detailed here, aiming to enhance its appeal in a competitive market segment.
Vauxhall Signum (Facelift 2005) 2.8i V6 Turbo ECOTEC
The Signum, launched in 2003, was based on the Opel/Vauxhall Vectra platform but distinguished itself with a more distinctive fastback profile and a focus on interior space and flexibility. The 2005 facelift refined the exterior styling, updating the front and rear fascias, and improving the overall interior quality. The 2.8i V6 Turbo ECOTEC engine was a flagship powertrain option, offering a substantial power output for the time and contributing to the Signum’s sporty character. This model year represents a peak in the Signum’s development, offering a compelling combination of performance, practicality, and features.
Engine & Performance
At the heart of the 2005 Vauxhall Signum 2.8i lies a 2.8-liter (2792 cm3 or 170.38 cu. in.) V6 engine, designated the Z28NEL. This engine utilizes a turbocharger and intercooler to boost power output to 230 horsepower (Hp) at 5500 rpm, and 330 Newton-meters (243.4 lb.-ft.) of torque available from 1800 to 4500 rpm. The engine features multi-port fuel injection and a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. This configuration delivers a power-to-liter ratio of 82.4 Hp/l. Power is delivered to the front wheels via a six-speed automatic transmission. The Signum 2.8i V6 could achieve a maximum speed of 243 km/h (150.99 mph). The weight-to-power ratio is 6.2 kg/Hp, and the weight-to-torque ratio is 4.3 kg/Nm, indicating a relatively responsive driving experience.
Design & Features
The Signum is a five-door hatchback, offering seating for five passengers. Its defining design feature is its sloping roofline, which contributes to its sporty silhouette. The 2005 facelift brought subtle but noticeable changes to the exterior, including revised headlights and a redesigned front bumper. Inside, the Signum prioritized space and flexibility. The rear seats could be folded down to significantly increase cargo capacity, ranging from a minimum of 365 liters (12.89 cu. ft.) to a maximum of 1410 liters (49.79 cu. ft.). Standard features for this trim level typically included ABS (Anti-lock braking system), ventilated front disc brakes, and disc brakes on the rear. The Signum aimed to provide a comfortable and well-equipped environment for both driver and passengers, focusing on practicality and a more engaging driving experience than traditional family sedans.
Technical Specifications
| Brand | Vauxhall |
| Model | Signum |
| Generation | Signum (facelift 2005) |
| Type (Engine) | 2.8i V6 24V Turbo ECOTEC (230 Hp) Automatic |
| Start of production | 2005 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 17.4 l/100 km (13.5 US mpg / 16.2 UK mpg / 5.7 km/l) |
| Fuel consumption (extra urban) | 7.6 l/100 km (30.9 US mpg / 37.2 UK mpg / 13.2 km/l) |
| Fuel consumption (combined) | 11.2 l/100 km (21 US mpg / 25.2 UK mpg / 8.9 km/l) |
| CO2 emissions | 269 g/km |
| Fuel Type | Petrol (Gasoline) |
| Maximum speed | 243 km/h (150.99 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 6.2 kg/Hp |
| Weight-to-torque ratio | 4.3 kg/Nm |
| Power | 230 Hp @ 5500 rpm |
| Power per litre | 82.4 Hp/l |
| Torque | 330 Nm @ 1800-4500 rpm (243.4 lb.-ft. @ 1800-4500 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | Z28NEL |
| Engine displacement | 2792 cm3 (170.38 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 89 mm (3.5 in.) |
| Piston Stroke | 74.8 mm (2.94 in.) |
| Compression ratio | 9.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Coolant | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Kerb Weight | 1415 kg (3119.54 lbs.) |
| Trunk (boot) space – minimum | 365 l (12.89 cu. ft.) |
| Trunk (boot) space – maximum | 1410 l (49.79 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Length | 4651 mm (183.11 in.) |
| Width | 1798 mm (70.79 in.) |
| Width including mirrors | 2036 mm (80.16 in.) |
| Height | 1466 mm (57.72 in.) |
| Wheelbase | 2830 mm (111.42 in.) |
| Drag coefficient (Cd) | 0.28 |
| Drivetrain Architecture | ICE, Front wheel drive |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Independent, McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
The Vauxhall Signum 2.8i V6 Turbo ECOTEC (2005-2006) offered a compelling package for European buyers seeking a versatile and relatively powerful hatchback. While not sold in the US market, it represents a noteworthy example of Vauxhall’s engineering and design capabilities during that period.
