1997 BMW 730 vs. 2003 BMW 645
To start off, 2003 BMW 645 is newer by 6 year(s). Which means there will be less support and parts availability for 1997 BMW 730. In addition, the cost of maintenance, including insurance, on 1997 BMW 730 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 (325 HP @ 6100 RPM) has 135 more horse power than 1997 BMW 730. (190 HP @ 5300 RPM) In normal driving conditions, 2003 BMW 645 should accelerate faster than 1997 BMW 730. With that said, vehicle weight also plays an important factor in acceleration. 1997 BMW 730 weights approximately 55 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 171 more torque (in Nm) than 1997 BMW 730. (279 Nm @ 3950 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1997 BMW 730.
Compare all specifications:
| 1997 BMW 730 | 2003 BMW 645 | |
| Make | BMW | BMW |
| Model | 730 | 645 |
| Year Released | 1997 | 2003 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2792 cc | 4398 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 190 HP | 325 HP |
| Engine RPM | 5300 RPM | 6100 RPM |
| Torque | 279 Nm | 450 Nm |
| Torque RPM | 3950 RPM | 3600 RPM |
| Engine Bore Size | 84 mm | 92 mm |
| Engine Stroke Size | 84 mm | 82.7 mm |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1745 kg | 1690 kg |
| Vehicle Length | 5130 mm | 4830 mm |
| Vehicle Width | 1870 mm | 1860 mm |
| Vehicle Height | 1430 mm | 1380 mm |
| Wheelbase Size | 2940 mm | 2890 mm |
| Fuel Tank Capacity | 90 L | 70 L |
