2008 Alpina B3 vs. 2004 BMW 645
To start off, 2008 Alpina B3 is newer by 4 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 would be higher. At 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 21 more horse power than 2008 Alpina B3. (301 HP @ 6300 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2008 Alpina B3. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 95 kg more than 2008 Alpina B3. 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, 2004 BMW 645 (447 Nm) has 84 more torque (in Nm) than 2008 Alpina B3. (363 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2008 Alpina B3.
Compare all specifications:
| 2008 Alpina B3 | 2004 BMW 645 | |
| Make | Alpina | BMW |
| Model | B3 | 645 |
| Year Released | 2008 | 2004 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3346 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 301 HP | 322 HP |
| Engine RPM | 6300 RPM | 7400 RPM |
| Torque | 363 Nm | 447 Nm |
| Engine Bore Size | 87 mm | 92 mm |
| Engine Stroke Size | 93.8 mm | 83 mm |
| Drive Type | Rear | Rear |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1620 kg | 1715 kg |
| Vehicle Length | 4490 mm | 4840 mm |
| Vehicle Width | 1760 mm | 1860 mm |
| Vehicle Height | 1360 mm | 1380 mm |
| Wheelbase Size | 2730 mm | 2790 mm |
| Fuel Consumption Overall | 11.2 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 63 L | 70 L |
