2003 Opel Signum vs. 2005 Opel Vectra
To start off, 2005 Opel Vectra is newer by 2 year(s). Which means there will be less support and parts availability for 2003 Opel Signum. In addition, the cost of maintenance, including insurance, on 2003 Opel Signum would be higher. At 3,173 cc (6 cylinders), 2003 Opel Signum is equipped with a bigger engine. In terms of performance, 2003 Opel Signum (207 HP @ 6200 RPM) has 34 more horse power than 2005 Opel Vectra. (173 HP @ 5500 RPM). In normal driving conditions, 2003 Opel Signum should accelerate faster than 2005 Opel Vectra. With that said, vehicle weight also plays an important factor in acceleration. 2003 Opel Signum weights approximately 128 kg more than 2005 Opel Vectra. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are front wheel drive (FWD). Which offers better traction when its slippery than rear wheel drive vehicles. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2003 Opel Signum (300 Nm @ 4000 RPM) has 35 more torque (in Nm) than 2005 Opel Vectra. (265 Nm @ 2500 RPM). This means 2003 Opel Signum will have an easier job in driving up hills or pulling heavy equipment than 2005 Opel Vectra. 2003 Opel Signum has automatic transmission and 2005 Opel Vectra has manual transmission. 2005 Opel Vectra will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2003 Opel Signum will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2003 Opel Signum | 2005 Opel Vectra | |
| Make | Opel | Opel |
| Model | Signum | Vectra |
| Year Released | 2003 | 2005 |
| Body Type | Hatchback | Sedan |
| Engine Position | Front | Front |
| Engine Size | 3173 cc | 1998 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 207 HP | 173 HP |
| Engine RPM | 6200 RPM | 5500 RPM |
| Torque | 300 Nm | 265 Nm |
| Torque RPM | 4000 RPM | 2500 RPM |
| Engine Bore Size | 87.5 mm | 86 mm |
| Engine Stroke Size | 88 mm | 86 mm |
| Engine Compression Ratio | 10.0:1 | 9.5:1 |
| Top Speed | 235 km/hour | 230 km/hour |
| Acceleration 0-100mph | 8.5 seconds | 9.4 seconds |
| Drive Type | Front | Front |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 1613 kg | 1485 kg |
| Vehicle Length | 4640 mm | 4600 mm |
| Vehicle Width | 1800 mm | 1800 mm |
| Vehicle Height | 1470 mm | 1470 mm |
| Wheelbase Size | 2840 mm | 2620 mm |
| Fuel Consumption Overall | 10.7 L/100km | 8.9 L/100km |
| Fuel Tank Capacity | 60 L | 61 L |
