1975 BMW 1502 vs. 2004 BMW 645
To start off, 2004 BMW 645 is newer by 29 year(s). Which means there will be less support and parts availability for 1975 BMW 1502. In addition, the cost of maintenance, including insurance, on 1975 BMW 1502 would be higher. At 4,398 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (328 HP @ 6100 RPM) has 255 more horse power than 1975 BMW 1502. (73 HP @ 5800 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 1975 BMW 1502. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 710 kg more than 1975 BMW 1502. 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 (450 Nm @ 3600 RPM) has 332 more torque (in Nm) than 1975 BMW 1502. (118 Nm @ 3700 RPM). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1975 BMW 1502.
Compare all specifications:
| 1975 BMW 1502 | 2004 BMW 645 | |
| Make | BMW | BMW |
| Model | 1502 | 645 |
| Year Released | 1975 | 2004 |
| Engine Position | Front | Front |
| Engine Size | 1573 cc | 4398 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 73 HP | 328 HP |
| Engine RPM | 5800 RPM | 6100 RPM |
| Torque | 118 Nm | 450 Nm |
| Torque RPM | 3700 RPM | 3600 RPM |
| Engine Bore Size | 84 mm | 92 mm |
| Engine Stroke Size | 71 mm | 82.7 mm |
| Engine Compression Ratio | 8.0:1 | 10.0:1 |
| Top Speed | 155 km/hour | 250 km/hour |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 980 kg | 1690 kg |
| Vehicle Length | 4240 mm | 4830 mm |
| Vehicle Width | 1600 mm | 1860 mm |
| Vehicle Height | 1420 mm | 1380 mm |
| Wheelbase Size | 2510 mm | 2830 mm |
| Fuel Tank Capacity | 50 L | 70 L |
