1999 Opel Signum vs. 2008 BMW 645
To start off, 2008 BMW 645 is newer by 9 year(s). Which means there will be less support and parts availability for 1999 Opel Signum. In addition, the cost of maintenance, including insurance, on 1999 Opel Signum would be higher. At 4,398 cc (8 cylinders), 2008 BMW 645 is equipped with a bigger engine. In terms of performance, 2008 BMW 645 (328 HP @ 6100 RPM) has 229 more horse power than 1999 Opel Signum. (99 HP @ 3120 RPM) In normal driving conditions, 2008 BMW 645 should accelerate faster than 1999 Opel Signum. With that said, vehicle weight also plays an important factor in acceleration. 2008 BMW 645 weights approximately 95 kg more than 1999 Opel Signum. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2008 BMW 645 is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 2008 BMW 645. However, in wet, icy, snow, or gravel driving conditions, 1999 Opel Signum, being front wheel drive (FWD), will offer much better control with better grip. 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 BMW 645 (450 Nm @ 3600 RPM) has 210 more torque (in Nm) than 1999 Opel Signum. (240 Nm @ 1500 RPM). This means 2008 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1999 Opel Signum. 2008 BMW 645 has automatic transmission and 1999 Opel Signum has manual transmission. 1999 Opel Signum will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2008 BMW 645 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 1999 Opel Signum | 2008 BMW 645 | |
| Make | Opel | BMW |
| Model | Signum | 645 |
| Year Released | 1999 | 2008 |
| Body Type | Hatchback | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1995 cc | 4398 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 99 HP | 328 HP |
| Engine RPM | 3120 RPM | 6100 RPM |
| Torque | 240 Nm | 450 Nm |
| Torque RPM | 1500 RPM | 3600 RPM |
| Engine Bore Size | 84 mm | 92.1 mm |
| Engine Stroke Size | 90 mm | 82.7 mm |
| Engine Compression Ratio | 18.5:1 | 10.0:1 |
| Drive Type | Front | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1595 kg | 1690 kg |
| Vehicle Length | 4640 mm | 4830 mm |
| Vehicle Width | 1800 mm | 1860 mm |
| Vehicle Height | 1470 mm | 1380 mm |
| Wheelbase Size | 2840 mm | 2790 mm |
| Fuel Tank Capacity | 60 L | 70 L |
