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 2,492 cc (5 cylinders), 2003 Alfa Romeo 156 is equipped with a bigger engine. In terms of performance, 2003 Alfa Romeo 156 (172 HP @ 4000 RPM) has 24 more horse power than 2005 Opel Vectra. (148 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. 2003 Alfa Romeo 156 weights approximately 185 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 Alfa Romeo 156 (385 Nm @ 2000 RPM) has 64 more torque (in Nm) than 2005 Opel Vectra. (321 Nm @ 2000 RPM). This means 2003 Alfa Romeo 156 will have an easier job in driving up hills or pulling heavy equipment than 2005 Opel Vectra.
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 | 2492 cc | 1909 cc |
| Engine Cylinders | 5 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 172 HP | 148 HP |
| Engine RPM | 4000 RPM | 4000 RPM |
| Torque | 385 Nm | 321 Nm |
| Torque RPM | 2000 RPM | 2000 RPM |
| Engine Compression Ratio | 18.5:1 | 18.0:1 |
| Fuel Type | Diesel | Diesel |
| Top Speed | 211 km/hour | 217 km/hour |
| Acceleration 0-100mph | 8.3 seconds | 9.8 seconds |
| Drive Type | Front | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1385 kg | 1200 kg |
| Vehicle Length | 4440 mm | 4600 mm |
| Vehicle Width | 1750 mm | 1800 mm |
| Vehicle Height | 1440 mm | 1470 mm |
| Wheelbase Size | 2600 mm | 2640 mm |
| Fuel Consumption Overall | 6.6 L/100km | 5.8 L/100km |
| Fuel Tank Capacity | 63 L | 61 L |
