2001 Alpina B3 vs. 2005 BMW 645
To start off, 2005 BMW 645 is newer by 4 year(s). Which means there will be less support and parts availability for 2001 Alpina B3. In addition, the cost of maintenance, including insurance, on 2001 Alpina B3 would be higher. At 4,392 cc (8 cylinders), 2005 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (326 HP @ 6100 RPM) has 30 more horse power than 2001 Alpina B3. (296 HP @ 6300 RPM) In normal driving conditions, 2005 BMW 645 should accelerate faster than 2001 Alpina B3. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 645 weights approximately 415 kg more than 2001 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, 2005 BMW 645 (447 Nm @ 3600 RPM) has 85 more torque (in Nm) than 2001 Alpina B3. (362 Nm @ 4800 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2001 Alpina B3.
Compare all specifications:
| 2001 Alpina B3 | 2005 BMW 645 | |
| Make | Alpina | BMW |
| Model | B3 | 645 |
| Year Released | 2001 | 2005 |
| Body Type | Coupe | Convertible |
| 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 | 296 HP | 326 HP |
| Engine RPM | 6300 RPM | 6100 RPM |
| Torque | 362 Nm | 447 Nm |
| Torque RPM | 4800 RPM | 3600 RPM |
| Engine Compression Ratio | 9.0:1 | 10.5:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Rear | Rear |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1480 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 | 2890 mm |
| Fuel Tank Capacity | 88 L | 70 L |
