1977 BMW 728 vs. 2007 BMW X5
To start off, 2007 BMW X5 is newer by 30 year(s). Which means there will be less support and parts availability for 1977 BMW 728. In addition, the cost of maintenance, including insurance, on 1977 BMW 728 would be higher. At 4,799 cc (8 cylinders), 2007 BMW X5 is equipped with a bigger engine. In terms of performance, 2007 BMW X5 (350 HP @ 6300 RPM) has 180 more horse power than 1977 BMW 728. (170 HP @ 6000 RPM) In normal driving conditions, 2007 BMW X5 should accelerate faster than 1977 BMW 728. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW X5 weights approximately 664 kg more than 1977 BMW 728. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2007 BMW X5 is four wheel drive (4WD), it will have significant more traction and grip than 1977 BMW 728. In wet, icy, snow, or gravel driving conditions, 2007 BMW X5 will offer significantly more control. 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, 2007 BMW X5 (476 Nm @ 3400 RPM) has 241 more torque (in Nm) than 1977 BMW 728. (235 Nm @ 3700 RPM). This means 2007 BMW X5 will have an easier job in driving up hills or pulling heavy equipment than 1977 BMW 728. 2007 BMW X5 has automatic transmission and 1977 BMW 728 has manual transmission. 1977 BMW 728 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2007 BMW X5 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 1977 BMW 728 | 2007 BMW X5 | |
| Make | BMW | BMW |
| Model | 728 | X5 |
| Year Released | 1977 | 2007 |
| Body Type | Sedan | SUV |
| Engine Position | Front | Front |
| Engine Size | 2788 cc | 4799 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 170 HP | 350 HP |
| Engine RPM | 6000 RPM | 6300 RPM |
| Torque | 235 Nm | 476 Nm |
| Torque RPM | 3700 RPM | 3400 RPM |
| Engine Bore Size | 86 mm | 93 mm |
| Engine Stroke Size | 80 mm | 88.3 mm |
| Top Speed | 193 km/hour | 246 km/hour |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1536 kg | 2200 kg |
| Vehicle Length | 4870 mm | 4860 mm |
| Vehicle Width | 1810 mm | 1940 mm |
| Vehicle Height | 1440 mm | 1770 mm |
| Wheelbase Size | 2800 mm | 2940 mm |
| Fuel Tank Capacity | 85 L | 85 L |
