2003 Alfa Romeo 156 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 Alfa Romeo 156. In addition, the cost of maintenance, including insurance, on 2003 Alfa Romeo 156 would be higher. At 2,387 cc (6 cylinders), 2003 Alfa Romeo 156 is equipped with a bigger engine. In terms of performance, 2003 Alfa Romeo 156 (189 HP @ 6300 RPM) has 64 more horse power than 2005 Opel Vectra. (125 HP @ 4000 RPM). In normal driving conditions, 2003 Alfa Romeo 156 should accelerate faster than 2005 Opel Vectra. With that said, vehicle weight also plays an important factor in acceleration. 2005 Opel Vectra weights approximately 88 kg more than 2003 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, 2005 Opel Vectra (270 Nm @ 1500 RPM) has 52 more torque (in Nm) than 2003 Alfa Romeo 156. (218 Nm @ 5000 RPM). This means 2005 Opel Vectra will have an easier job in driving up hills or pulling heavy equipment than 2003 Alfa Romeo 156. 2003 Alfa Romeo 156 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 Alfa Romeo 156 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2003 Alfa Romeo 156 | 2005 Opel Vectra | |
| Make | Alfa Romeo | Opel |
| Model | 156 | Vectra |
| Year Released | 2003 | 2005 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2387 cc | 2171 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 189 HP | 125 HP |
| Engine RPM | 6300 RPM | 4000 RPM |
| Torque | 218 Nm | 270 Nm |
| Torque RPM | 5000 RPM | 1500 RPM |
| Engine Compression Ratio | 10.3:1 | 18.5:1 |
| Top Speed | 222 km/hour | 206 km/hour |
| Acceleration 0-100mph | 8.5 seconds | 11.1 seconds |
| Drive Type | Front | Front |
| Transmission Type | Automatic | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1435 kg | 1523 kg |
| Vehicle Length | 4440 mm | 4830 mm |
| Vehicle Width | 1750 mm | 1800 mm |
| Vehicle Height | 1440 mm | 1510 mm |
| Wheelbase Size | 2710 mm | 2710 mm |
| Fuel Consumption Overall | 11.9 L/100km | 6.5 L/100km |
| Fuel Tank Capacity | 63 L | 61 L |
