2007 Alpina D3 vs. 2003 BMW 645
To start off, 2007 Alpina D3 is newer by 4 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 20 more horse power than 2007 Alpina D3. (301 HP @ 6300 RPM) In normal driving conditions, 2003 BMW 645 should accelerate faster than 2007 Alpina D3. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 445 kg more than 2007 Alpina D3. 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, 2003 BMW 645 (450 Nm @ 3600 RPM) has 88 more torque (in Nm) than 2007 Alpina D3. (362 Nm @ 4800 RPM). This means 2003 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2007 Alpina D3. 2003 BMW 645 has automatic transmission and 2007 Alpina D3 has manual transmission. 2007 Alpina D3 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2003 BMW 645 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2007 Alpina D3 | 2003 BMW 645 | |
| Make | Alpina | BMW |
| Model | D3 | 645 |
| Year Released | 2007 | 2003 |
| Body Type | Coupe | Convertible |
| Engine Position | Front | Front |
| Engine Size | 3346 cc | 4398 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 301 HP | 321 HP |
| Engine RPM | 6300 RPM | 6100 RPM |
| Torque | 362 Nm | 450 Nm |
| Torque RPM | 4800 RPM | 3600 RPM |
| Engine Bore Size | 87 mm | 92 mm |
| Engine Stroke Size | 93.8 mm | 82.7 mm |
| Engine Compression Ratio | 10.2:1 | 10.5:1 |
| Top Speed | 271 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5.4 seconds | 6.2 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1450 kg | 1895 kg |
| Vehicle Length | 4490 mm | 4830 mm |
| Vehicle Width | 1760 mm | 1860 mm |
| Vehicle Height | 1370 mm | 1380 mm |
| Wheelbase Size | 2730 mm | 2790 mm |
| Fuel Consumption Overall | 11 L/100km | 11.5 L/100km |
| Fuel Tank Capacity | 63 L | 70 L |
