2005 BMW 325 vs. 2005 BMW 645
To start off, both 2005 BMW 325 and 2005 BMW 645 were released in the same year (2005). Therefore the support and the availability on parts for both vehicles should be relatively similar. 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 111 more horse power than 2005 BMW 325. (215 HP @ 6500 RPM) In normal driving conditions, 2005 BMW 645 should accelerate faster than 2005 BMW 325. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 645 weights approximately 401 kg more than 2005 BMW 325. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 2005 BMW 645 (447 Nm @ 3600 RPM) has 197 more torque (in Nm) than 2005 BMW 325. (250 Nm @ 2750 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2005 BMW 325.
Compare all specifications:
| 2005 BMW 325 | 2005 BMW 645 | |
| Make | BMW | BMW |
| Model | 325 | 645 |
| Year Released | 2005 | 2005 |
| Body Type | Station Wagon | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2497 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 215 HP | 326 HP |
| Engine RPM | 6500 RPM | 6100 RPM |
| Torque | 250 Nm | 447 Nm |
| Torque RPM | 2750 RPM | 3600 RPM |
| Engine Bore Size | 82 mm | 92 mm |
| Engine Stroke Size | 78.8 mm | 83 mm |
| Engine Compression Ratio | 11.0:1 | 10.5:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1494 kg | 1895 kg |
| Vehicle Length | 4480 mm | 4830 mm |
| Vehicle Width | 1820 mm | 1860 mm |
| Vehicle Height | 1440 mm | 1380 mm |
| Wheelbase Size | 2730 mm | 2890 mm |
| Fuel Tank Capacity | 63 L | 70 L |
