2005 Opel Astra vs. 2008 Opel Signum
To start off, 2008 Opel Signum is newer by 3 year(s). Which means there will be less support and parts availability for 2005 Opel Astra. In addition, the cost of maintenance, including insurance, on 2005 Opel Astra would be higher. At 3,175 cc (6 cylinders), 2008 Opel Signum is equipped with a bigger engine. In terms of performance, 2008 Opel Signum (208 HP @ 6200 RPM) has 123 more horse power than 2005 Opel Astra. (85 HP @ 5800 RPM) In normal driving conditions, 2008 Opel Signum should accelerate faster than 2005 Opel Astra. With that said, vehicle weight also plays an important factor in acceleration. 2008 Opel Signum weights approximately 360 kg more than 2005 Opel Astra. 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, 2008 Opel Signum (300 Nm @ 4000 RPM) has 173 more torque (in Nm) than 2005 Opel Astra. (127 Nm @ 4000 RPM). This means 2008 Opel Signum will have an easier job in driving up hills or pulling heavy equipment than 2005 Opel Astra. 2008 Opel Signum has automatic transmission and 2005 Opel Astra has manual transmission. 2005 Opel Astra will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2008 Opel Signum will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2005 Opel Astra | 2008 Opel Signum | |
| Make | Opel | Opel |
| Model | Astra | Signum |
| Year Released | 2005 | 2008 |
| Engine Position | Front | Front |
| Engine Size | 1388 cc | 3175 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 85 HP | 208 HP |
| Engine RPM | 5800 RPM | 6200 RPM |
| Torque | 127 Nm | 300 Nm |
| Torque RPM | 4000 RPM | 4000 RPM |
| Engine Bore Size | 73.4 mm | 87.5 mm |
| Engine Stroke Size | 80.6 mm | 88 mm |
| Engine Compression Ratio | 10.5:1 | 10.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Front | Front |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Vehicle Weight | 1250 kg | 1610 kg |
| Vehicle Length | 4520 mm | 4640 mm |
| Vehicle Width | 1800 mm | 1800 mm |
| Vehicle Height | 1510 mm | 1470 mm |
| Wheelbase Size | 3010 mm | 2840 mm |
