2005 Alfa Romeo 156 vs. 2003 Opel Vectra
To start off, 2005 Alfa Romeo 156 is newer by 2 year(s). Which means there will be less support and parts availability for 2003 Opel Vectra. In addition, the cost of maintenance, including insurance, on 2003 Opel Vectra would be higher. At 2,958 cc (6 cylinders), 2003 Opel Vectra is equipped with a bigger engine. In terms of performance, 2005 Alfa Romeo 156 (185 HP @ 5000 RPM) has 11 more horse power than 2003 Opel Vectra. (174 HP @ 4000 RPM). In normal driving conditions, 2005 Alfa Romeo 156 should accelerate faster than 2003 Opel Vectra. With that said, vehicle weight also plays an important factor in acceleration. 2003 Opel Vectra weights approximately 274 kg more than 2005 Alfa Romeo 156.
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 Vectra (370 Nm @ 1900 RPM) has 148 more torque (in Nm) than 2005 Alfa Romeo 156. (222 Nm @ 5000 RPM). This means 2003 Opel Vectra will have an easier job in driving up hills or pulling heavy equipment than 2005 Alfa Romeo 156. 2003 Opel Vectra has automatic transmission and 2005 Alfa Romeo 156 has manual transmission. 2005 Alfa Romeo 156 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2003 Opel Vectra will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2005 Alfa Romeo 156 | 2003 Opel Vectra | |
| Make | Alfa Romeo | Opel |
| Model | 156 | Vectra |
| Year Released | 2005 | 2003 |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 2958 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 185 HP | 174 HP |
| Engine RPM | 5000 RPM | 4000 RPM |
| Torque | 222 Nm | 370 Nm |
| Torque RPM | 5000 RPM | 1900 RPM |
| Engine Bore Size | 88 mm | 87.5 mm |
| Engine Stroke Size | 68.3 mm | 82 mm |
| Top Speed | 225 km/hour | 220 km/hour |
| Acceleration 0-100mph | 8.4 seconds | 10.1 seconds |
| Drive Type | Front | Front |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 5 doors |
| Vehicle Weight | 1490 kg | 1764 kg |
| Vehicle Length | 4450 mm | 4830 mm |
| Vehicle Width | 1750 mm | 1800 mm |
| Vehicle Height | 1440 mm | 1510 mm |
| Wheelbase Size | 2710 mm | 2840 mm |
| Fuel Consumption Overall | 11.8 L/100km | 7.7 L/100km |
| Fuel Tank Capacity | 72 L | 60 L |
