2003 Opel Signum vs. 2004 Alfa Romeo 166
To start off, 2004 Alfa Romeo 166 is newer by 1 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 2,959 cc (6 cylinders), 2004 Alfa Romeo 166 is equipped with a bigger engine. In terms of performance, 2004 Alfa Romeo 166 (217 HP @ 6300 RPM) has 102 more horse power than 2003 Opel Signum. (115 HP @ 3000 RPM) In normal driving conditions, 2004 Alfa Romeo 166 should accelerate faster than 2003 Opel Signum. With that said, vehicle weight also plays an important factor in acceleration. 2004 Alfa Romeo 166 weights approximately 15 kg more than 2003 Opel Signum. 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 Opel Signum (280 Nm @ 1500 RPM) has 15 more torque (in Nm) than 2004 Alfa Romeo 166. (265 Nm @ 5000 RPM). This means 2003 Opel Signum will have an easier job in driving up hills or pulling heavy equipment than 2004 Alfa Romeo 166.
Compare all specifications:
| 2003 Opel Signum | 2004 Alfa Romeo 166 | |
| Make | Opel | Alfa Romeo |
| Model | Signum | 166 |
| Year Released | 2003 | 2004 |
| Body Type | Hatchback | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2172 cc | 2959 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 115 HP | 217 HP |
| Engine RPM | 3000 RPM | 6300 RPM |
| Torque | 280 Nm | 265 Nm |
| Torque RPM | 1500 RPM | 5000 RPM |
| Engine Bore Size | 84.1 mm | 93 mm |
| Engine Stroke Size | 98 mm | 72.6 mm |
| Drive Type | Front | Front |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 1535 kg | 1550 kg |
| Vehicle Length | 4640 mm | 4730 mm |
| Vehicle Width | 1800 mm | 1810 mm |
| Vehicle Height | 1470 mm | 1420 mm |
| Wheelbase Size | 2840 mm | 2600 mm |
