2003 BMW 645 vs. 2013 BMW 7 Series
To start off, 2013 BMW 7 Series is newer by 10 year(s). Which means there will be less support and parts availability for 2003 BMW 645. In addition, the cost of maintenance, including insurance, on 2003 BMW 645 would be higher. At 5,972 cc (12 cylinders), 2013 BMW 7 Series is equipped with a bigger engine. In terms of performance, 2013 BMW 7 Series (528 HP @ 5250 RPM) has 207 more horse power than 2003 BMW 645. (321 HP @ 6100 RPM) In normal driving conditions, 2013 BMW 7 Series should accelerate faster than 2003 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2013 BMW 7 Series weights approximately 380 kg more than 2003 BMW 645. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front 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, 2013 BMW 7 Series (746 Nm @ 5000 RPM) has 296 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2013 BMW 7 Series will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645.
Compare all specifications:
| 2003 BMW 645 | 2013 BMW 7 Series | |
| Make | BMW | BMW |
| Model | 645 | 7 Series |
| Year Released | 2003 | 2013 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 5972 cc |
| Engine Cylinders | 8 cylinders | 12 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 321 HP | 528 HP |
| Engine RPM | 6100 RPM | 5250 RPM |
| Torque | 450 Nm | 746 Nm |
| Torque RPM | 3600 RPM | 5000 RPM |
| Engine Bore Size | 92 mm | 89 mm |
| Engine Stroke Size | 82.7 mm | 80 mm |
| Engine Compression Ratio | 10.5:1 | 10.0 :1 |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 6.2 seconds | 4.6 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | 8-speed automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1895 kg | 2275 kg |
| Vehicle Length | 4830 mm | 5214 mm |
| Vehicle Width | 1860 mm | 2134 mm |
| Vehicle Height | 1380 mm | 1481 mm |
| Wheelbase Size | 2790 mm | 3210 mm |
| Fuel Consumption | 8.5 L/100km | 10.4 L/100km |
| Fuel Consumption City | 16.8 L/100km | 16.8 L/100km |
| Fuel Tank Capacity | 70 L | 80 L |
