Comparison GMC Sierra 2500HD III (GMT900) Crew Cab Standard Box 6.6 Duramax TD V8 (365 Hp) Automatic & Opel Vectra C (facelift 2005) 2.8i V6 24V Turbo (230 Hp) & Opel Signum 3.2i V6 24V ECOTEC (211 Hp)
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| Brand: | GMC | Opel | Opel |
| Model: | Sierra 2500HD | Vectra | Signum |
| Generation: | Sierra 2500HD III (GMT900) Crew Cab Standard Box | Vectra C (facelift 2005) | Signum |
| Engine / modification: | 6.6 Duramax TD V8 (365 Hp) Automatic | 2.8i V6 24V Turbo (230 Hp) | 3.2i V6 24V ECOTEC (211 Hp) |
| Production start: | 2007 year | 2005 year | 2003 year |
| Production end: | 2010 year | 2006 year | 2005 year |
| Coupe type: | Pick-up | Sedan | Hatchback |
| Powertrain Architecture: | Internal Combustion engine | ||
| Num. of Doors: | 4 | 4 | 5 |
| Num. of seats: | 5 | 5 | 5 |
| Fuel consumption / economy - urban: | 15.4 l/100 km | 14.3 l/100 km | |
| Fuel consumption / economy - extra urban: | 7.3 l/100 km | 7.6 l/100 km | |
| Fuel consumption / economy - combined: | 10.9 l/100 km | 10.1 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.33 | ||
| Fuel tank volume: | 61 l | 60 l | |
| Power: | 365 hp | 230 hp | 211 hp |
| Max power in: | 3200 rpm. | 5500 rpm. | 6200 rpm. |
| Maximum speed: | 250 km/h | 237 km/h | |
| Acceleration from 0 to 100 km/h: | 7.3 sec | 7.9 sec | |
| Torque: | 895 Nm @ 1600 rpm. | 330 Nm | 300 Nm @ 4000 rpm. |
| Model Engine: | Duramax LMM | Z28NEL | |
| Engine position: | Front, transverse | Front, transverse | |
| Engine displacement: | 6599 cm3 | 2792 cm3 | 3175 cm3 |
| Engine oil capacity: | 9.5 l | 6.0 l | |
| Coolant: | 24 l | ||
| Fuel System: | Multi-point injection | Multi-point injection | |
| Maximum engine speed: | 3450 rpm. | ||
| Aspiration / Turbine: | Turbocharging | ||
| Position of cylinders: | V engine | V engine | |
| Valvetrain: | OHV | DOHC | |
| Number of cylinders: | 8 | 6 | 6 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 16.8 | 9.5 | 10 |
| Piston Stroke: | 99 mm | 74.8 mm | 88 mm |
| Cylinder Bore: | 103 mm | 89 mm | 87.5 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 6 | 5 | |
| Number of Gears (manual transmission): | 6 | 5 | |
| Length: | 6094 mm | 4611 mm | 4636 mm |
| Width: | 1798 mm | 1798 mm | |
| Width including mirrors: | 2032 mm | ||
| Height: | 1958 mm | 1460 mm | 1466 mm |
| Wheelbase: | 3886 mm | 2700 mm | 2830 mm |
| Front track: | 1744 mm | 1536 mm | 1524 mm |
| Rear (Back) track: | 1676 mm | 1525 mm | 1512 mm |
| Ride height(clearance): | 243 mm | ||
| Minimum volume of Luggage (trunk): | 365 l | ||
| Maximum amount of Luggage (trunk): | 1718 l | 500 l | 1410 l |
| Front suspension: | Independent torsion bar, double wishbone | Independent, spring | Coil spring |
| Rear suspension: | Independent, spring | Helical spring | |
| Max weight: | 4173 kg | 2040 kg | 2125 kg |
| Front brakes: | Ventilated discs | Ventilated discs | |
| Rear brakes: | Ventilated discs | Ventilated discs | |
| Kerb Weight: | 2911 kg | 1495 kg | 1610 kg |
| ABS: | yes | yes | |
| Steering type: | Cone worm with recirculation balls | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | ||
| Minimum turning circle (turning diameter): | 15.6 m | ||
| Permitted trailer load with brakes (12%): | 5897 kg | ||
| Tire size: | 245/75 R16; 265/75 R17 | 215/55 R16 | 215/55 R16 |
| Wheel rims size: | 6.5J x 16; 7.5J x 17 | R16 | 6.5J x 16 |