2005 Alfa Romeo 156 vs. 2004 Opel Vectra
To start off, 2005 Alfa Romeo 156 is newer by 1 year(s). Which means there will be less support and parts availability for 2004 Opel Vectra. In addition, the cost of maintenance, including insurance, on 2004 Opel Vectra would be higher. At 2,169 cc (4 cylinders), 2004 Opel Vectra is equipped with a bigger engine. In terms of performance, 2005 Alfa Romeo 156 (173 HP @ 4000 RPM) has 50 more horse power than 2004 Opel Vectra. (123 HP @ 4000 RPM). In normal driving conditions, 2005 Alfa Romeo 156 should accelerate faster than 2004 Opel Vectra. With that said, vehicle weight also plays an important factor in acceleration. 2004 Opel Vectra weights approximately 255 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, 2004 Opel Vectra (280 Nm @ 1500 RPM) has 93 more torque (in Nm) than 2005 Alfa Romeo 156. (187 Nm @ 3500 RPM). This means 2004 Opel Vectra will have an easier job in driving up hills or pulling heavy equipment than 2005 Alfa Romeo 156. 2004 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. 2004 Opel Vectra will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2005 Alfa Romeo 156 | 2004 Opel Vectra | |
| Make | Alfa Romeo | Opel |
| Model | 156 | Vectra |
| Year Released | 2005 | 2004 |
| Engine Position | Front | Front |
| Engine Size | 1969 cc | 2169 cc |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 173 HP | 123 HP |
| Engine RPM | 4000 RPM | 4000 RPM |
| Torque | 187 Nm | 280 Nm |
| Torque RPM | 3500 RPM | 1500 RPM |
| Engine Bore Size | 83 mm | 84 mm |
| Engine Stroke Size | 91 mm | 98 mm |
| Engine Compression Ratio | 10.0:1 | 18.5:1 |
| Drive Type | Front | Front |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1250 kg | 1505 kg |
| Wheelbase Size | 2550 mm | 2720 mm |
| Fuel Tank Capacity | 63 L | 61 L |
