2003 Alfa Romeo 156 vs. 2004 Opel Vectra
To start off, 2004 Opel Vectra is newer by 1 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 (5 cylinders), 2003 Alfa Romeo 156 is equipped with a bigger engine. In terms of performance, 2004 Opel Vectra (175 HP @ 5500 RPM) has 1 more horse power than 2003 Alfa Romeo 156. (174 HP @ 4000 RPM) In normal driving conditions, 2004 Opel Vectra should accelerate faster than 2003 Alfa Romeo 156. With that said, vehicle weight also plays an important factor in acceleration. 2004 Opel Vectra weights approximately 10 kg more than 2003 Alfa Romeo 156. 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 120 more torque (in Nm) than 2004 Opel Vectra. (265 Nm @ 2500 RPM). This means 2003 Alfa Romeo 156 will have an easier job in driving up hills or pulling heavy equipment than 2004 Opel Vectra.
Compare all specifications:
| 2003 Alfa Romeo 156 | 2004 Opel Vectra | |
| Make | Alfa Romeo | Opel |
| Model | 156 | Vectra |
| Year Released | 2003 | 2004 |
| Engine Position | Front | Front |
| Engine Size | 2387 cc | 1998 cc |
| Engine Cylinders | 5 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 174 HP | 175 HP |
| Engine RPM | 4000 RPM | 5500 RPM |
| Torque | 385 Nm | 265 Nm |
| Torque RPM | 2000 RPM | 2500 RPM |
| Engine Bore Size | 82 mm | 86 mm |
| Engine Stroke Size | 90.4 mm | 86 mm |
| Engine Compression Ratio | 18.5:1 | 9.5:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Acceleration 0-100mph | 8.3 seconds | 9.4 seconds |
| Drive Type | Front | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1460 kg | 1470 kg |
| Vehicle Length | 4440 mm | 4600 mm |
| Vehicle Width | 1750 mm | 1800 mm |
| Vehicle Height | 1440 mm | 1470 mm |
| Wheelbase Size | 2550 mm | 2740 mm |
| Fuel Consumption Overall | 6.6 L/100km | 8.9 L/100km |
