1975 BMW 1502 vs. 1977 BMW 728
To start off, 1977 BMW 728 is newer by 2 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 2,788 cc (6 cylinders), 1977 BMW 728 is equipped with a bigger engine. In terms of performance, 1977 BMW 728 (170 HP @ 6000 RPM) has 97 more horse power than 1975 BMW 1502. (73 HP @ 5800 RPM) In normal driving conditions, 1977 BMW 728 should accelerate faster than 1975 BMW 1502. With that said, vehicle weight also plays an important factor in acceleration. 1977 BMW 728 weights approximately 556 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, 1977 BMW 728 (235 Nm @ 3700 RPM) has 117 more torque (in Nm) than 1975 BMW 1502. (118 Nm @ 3700 RPM). This means 1977 BMW 728 will have an easier job in driving up hills or pulling heavy equipment than 1975 BMW 1502.
Compare all specifications:
| 1975 BMW 1502 | 1977 BMW 728 | |
| Make | BMW | BMW |
| Model | 1502 | 728 |
| Year Released | 1975 | 1977 |
| Engine Position | Front | Front |
| Engine Size | 1573 cc | 2788 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 73 HP | 170 HP |
| Engine RPM | 5800 RPM | 6000 RPM |
| Torque | 118 Nm | 235 Nm |
| Torque RPM | 3700 RPM | 3700 RPM |
| Engine Bore Size | 84 mm | 86 mm |
| Engine Stroke Size | 71 mm | 80 mm |
| Engine Compression Ratio | 8.0:1 | 9.0:1 |
| Top Speed | 155 km/hour | 193 km/hour |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 980 kg | 1536 kg |
| Vehicle Length | 4240 mm | 4870 mm |
| Vehicle Width | 1600 mm | 1810 mm |
| Vehicle Height | 1420 mm | 1440 mm |
| Wheelbase Size | 2510 mm | 2800 mm |
| Fuel Tank Capacity | 50 L | 85 L |
