2003 BMW 645 vs. 1991 Porsche 928
To start off, 2003 BMW 645 is newer by 12 year(s). Which means there will be less support and parts availability for 1991 Porsche 928. In addition, the cost of maintenance, including insurance, on 1991 Porsche 928 would be higher. At 5,397 cc (8 cylinders), 1991 Porsche 928 is equipped with a bigger engine. In terms of performance, 1991 Porsche 928 (345 HP @ 5700 RPM) has 20 more horse power than 2003 BMW 645. (325 HP @ 6100 RPM) In normal driving conditions, 1991 Porsche 928 should accelerate faster than 2003 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW 645 weights approximately 90 kg more than 1991 Porsche 928.
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, 1991 Porsche 928 (500 Nm @ 4250 RPM) has 50 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 1991 Porsche 928 will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645.
Compare all specifications:
| 2003 BMW 645 | 1991 Porsche 928 | |
| Make | BMW | Porsche |
| Model | 645 | 928 |
| Year Released | 2003 | 1991 |
| Body Type | Coupe | Coupe |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 5397 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Horse Power | 325 HP | 345 HP |
| Engine RPM | 6100 RPM | 5700 RPM |
| Torque | 450 Nm | 500 Nm |
| Torque RPM | 3600 RPM | 4250 RPM |
| Engine Bore Size | 92 mm | 100.1 mm |
| Engine Stroke Size | 82.7 mm | 85.9 mm |
| Engine Compression Ratio | 10.5:1 | 10.4:1 |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1690 kg | 1600 kg |
| Vehicle Length | 4830 mm | 4450 mm |
| Vehicle Width | 1860 mm | 1860 mm |
| Vehicle Height | 1380 mm | 1290 mm |
| Wheelbase Size | 2890 mm | 2510 mm |
| Fuel Tank Capacity | 70 L | 86 L |
