2005 Opel Vectra vs. 2003 Opel Signum
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 2,958 cc (6 cylinders), 2003 Opel Signum is equipped with a bigger engine. In terms of performance, 2003 Opel Signum (174 HP @ 4000 RPM) has 1 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 210 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 (370 Nm @ 1900 RPM) has 105 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:
| 2005 Opel Vectra | 2003 Opel Signum | |
| Make | Opel | Opel |
| Model | Vectra | Signum |
| Year Released | 2005 | 2003 |
| Body Type | Sedan | Hatchback |
| Engine Position | Front | Front |
| Engine Size | 1998 cc | 2958 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 173 HP | 174 HP |
| Engine RPM | 5500 RPM | 4000 RPM |
| Torque | 265 Nm | 370 Nm |
| Torque RPM | 2500 RPM | 1900 RPM |
| Engine Bore Size | 86 mm | 87.6 mm |
| Engine Stroke Size | 86 mm | 82 mm |
| Engine Compression Ratio | 9.5:1 | 18.5:1 |
| Acceleration 0-100mph | 9.4 seconds | 9.9 seconds |
| Drive Type | Front | Front |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1485 kg | 1695 kg |
| Vehicle Length | 4600 mm | 4640 mm |
| Vehicle Width | 1800 mm | 1800 mm |
| Vehicle Height | 1470 mm | 1470 mm |
| Wheelbase Size | 2620 mm | 2710 mm |
| Fuel Consumption Overall | 8.9 L/100km | 7.9 L/100km |
| Fuel Tank Capacity | 61 L | 60 L |
