2005 Alfa Romeo 156 vs. 2003 Opel Signum
To start off, 2005 Alfa Romeo 156 is newer by 2 year(s). Which means there will be less support and parts availability for 2003 Opel Signum. In addition, the cost of maintenance, including insurance, on 2003 Opel Signum would be higher. At 1,796 cc (4 cylinders), 2003 Opel Signum is equipped with a bigger engine. In terms of performance, 2003 Opel Signum (125 HP @ 6000 RPM) has 7 more horse power than 2005 Alfa Romeo 156. (118 HP @ 6400 RPM) In normal driving conditions, 2003 Opel Signum should accelerate faster than 2005 Alfa Romeo 156. With that said, vehicle weight also plays an important factor in acceleration. 2005 Alfa Romeo 156 weights approximately 5 kg more than 2003 Opel Signum.
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 Opel Signum (167 Nm @ 3800 RPM) has 21 more torque (in Nm) than 2005 Alfa Romeo 156. (146 Nm @ 4200 RPM). This means 2003 Opel Signum will have an easier job in driving up hills or pulling heavy equipment than 2005 Alfa Romeo 156.
Compare all specifications:
| 2005 Alfa Romeo 156 | 2003 Opel Signum | |
| Make | Alfa Romeo | Opel |
| Model | 156 | Signum |
| Year Released | 2005 | 2003 |
| Body Type | Sedan | Hatchback |
| Engine Position | Front | Front |
| Engine Size | 1596 cc | 1796 cc |
| Engine Cylinders | 4 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 118 HP | 125 HP |
| Engine RPM | 6400 RPM | 6000 RPM |
| Torque | 146 Nm | 167 Nm |
| Torque RPM | 4200 RPM | 3800 RPM |
| Engine Bore Size | 82 mm | 80.6 mm |
| Engine Stroke Size | 75.6 mm | 88.2 mm |
| Engine Compression Ratio | 10.3:1 | 10.5:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | Front | Front |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1390 kg | 1385 kg |
| Vehicle Length | 4440 mm | 4640 mm |
| Vehicle Width | 1750 mm | 1800 mm |
| Vehicle Height | 1400 mm | 1470 mm |
| Wheelbase Size | 2600 mm | 2500 mm |
| Fuel Consumption Overall | 8.2 L/100km | 7.5 L/100km |
| Fuel Tank Capacity | 63 L | 58 L |
