2003 BMW 645 vs. 2005 BMW 745
To start off, 2005 BMW 745 is newer by 2 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. Both 2003 BMW 645 and 2005 BMW 745 are equipped with a 4,398 cc engine. In terms of performance, 2005 BMW 745 (325 HP @ 6000 RPM) has 4 more horse power than 2003 BMW 645. (321 HP @ 6100 RPM) In normal driving conditions, 2005 BMW 745 should accelerate faster than 2003 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 745 weights approximately 115 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, both vehicles can yield 450 Nm of torque. So under normal driving conditions, the ability to climb up hills and pull heavy equipment should be relatively similar for both vehicles.
Compare all specifications:
| 2003 BMW 645 | 2005 BMW 745 | |
| Make | BMW | BMW |
| Model | 645 | 745 |
| Year Released | 2003 | 2005 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 321 HP | 325 HP |
| Engine RPM | 6100 RPM | 6000 RPM |
| Torque | 450 Nm | 450 Nm |
| Torque RPM | 3600 RPM | 3600 RPM |
| Engine Bore Size | 92 mm | 92.1 mm |
| Engine Stroke Size | 82.7 mm | 82.7 mm |
| Engine Compression Ratio | 10.5:1 | 10.5:1 |
| Acceleration 0-100mph | 6.2 seconds | 6.6 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1895 kg | 2010 kg |
| Wheelbase Size | 2790 mm | 3000 mm |
| Fuel Consumption Overall | 11.5 L/100km | 11.2 L/100km |
| Fuel Tank Capacity | 70 L | 88 L |
