2005 Alfa Romeo 156 vs. 2004 Opel Signum
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 Signum. In addition, the cost of maintenance, including insurance, on 2004 Opel Signum would be higher. Both 2005 Alfa Romeo 156 and 2004 Opel Signum are equipped with a 1,910 cc engine. In terms of performance, 2005 Alfa Romeo 156 (148 HP @ 4000 RPM) has 49 more horse power than 2004 Opel Signum. (99 HP @ 3120 RPM). In normal driving conditions, 2005 Alfa Romeo 156 should accelerate faster than 2004 Opel Signum. With that said, vehicle weight also plays an important factor in acceleration. 2004 Opel Signum weights approximately 10 kg more than 2005 Alfa Romeo 156.
Because 2005 Alfa Romeo 156 is four wheel drive (4WD), it will have significant more traction and grip than 2004 Opel Signum. In wet, icy, snow, or gravel driving conditions, 2005 Alfa Romeo 156 will offer significantly more control. 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 Alfa Romeo 156 (310 Nm @ 2000 RPM) has 80 more torque (in Nm) than 2004 Opel Signum. (230 Nm @ 1500 RPM). This means 2005 Alfa Romeo 156 will have an easier job in driving up hills or pulling heavy equipment than 2004 Opel Signum.
Compare all specifications:
| 2005 Alfa Romeo 156 | 2004 Opel Signum | |
| Make | Alfa Romeo | Opel |
| Model | 156 | Signum |
| Year Released | 2005 | 2004 |
| Body Type | Station Wagon | Hatchback |
| Engine Position | Front | Front |
| Engine Size | 1910 cc | 1910 cc |
| Engine Cylinders | 4 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 148 HP | 99 HP |
| Engine RPM | 4000 RPM | 3120 RPM |
| Torque | 310 Nm | 230 Nm |
| Torque RPM | 2000 RPM | 1500 RPM |
| Engine Bore Size | 82 mm | 84.1 mm |
| Engine Stroke Size | 90.4 mm | 90 mm |
| Engine Compression Ratio | 18.5:1 | 18.5:1 |
| Fuel Type | Diesel | Diesel |
| Drive Type | 4WD | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 5 doors |
| Vehicle Weight | 1585 kg | 1595 kg |
| Vehicle Width | 1750 mm | 1800 mm |
| Vehicle Height | 1460 mm | 1470 mm |
| Wheelbase Size | 2600 mm | 2620 mm |
| Fuel Consumption Overall | 6.8 L/100km | 5.9 L/100km |
| Fuel Tank Capacity | 50 L | 58 L |
