2009 BMW 730 vs. 2003 BMW 645
To start off, 2009 BMW 730 is newer by 6 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 4,398 cc (8 cylinders), 2003 BMW 645 is equipped with a bigger engine. In terms of performance, 2003 BMW 645 (321 HP @ 6100 RPM) has 67 more horse power than 2009 BMW 730. (254 HP @ 6600 RPM) In normal driving conditions, 2003 BMW 645 should accelerate faster than 2009 BMW 730. With that said, vehicle weight also plays an important factor in acceleration. 2009 BMW 730 weights approximately 40 kg more than 2003 BMW 645.
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, 2003 BMW 645 (450 Nm @ 3600 RPM) has 149 more torque (in Nm) than 2009 BMW 730. (301 Nm @ 2500 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2009 BMW 730.
Compare all specifications:
| 2009 BMW 730 | 2003 BMW 645 | |
| Make | BMW | BMW |
| Model | 730 | 645 |
| Year Released | 2009 | 2003 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2996 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 254 HP | 321 HP |
| Engine RPM | 6600 RPM | 6100 RPM |
| Torque | 301 Nm | 450 Nm |
| Torque RPM | 2500 RPM | 3600 RPM |
| Top Speed | 244 km/hour | 250 km/hour |
| Acceleration 0-100mph | 7.8 seconds | 6.2 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1935 kg | 1895 kg |
| Vehicle Length | 5040 mm | 4830 mm |
| Vehicle Width | 1910 mm | 1860 mm |
| Vehicle Height | 1500 mm | 1380 mm |
| Wheelbase Size | 3000 mm | 2790 mm |
| Fuel Consumption Overall | 10.1 L/100km | 11.5 L/100km |
| Fuel Tank Capacity | 88 L | 70 L |
