1981 BMW 745 vs. 2005 BMW X5
To start off, 2005 BMW X5 is newer by 24 year(s). Which means there will be less support and parts availability for 1981 BMW 745. In addition, the cost of maintenance, including insurance, on 1981 BMW 745 would be higher. At 3,430 cc (6 cylinders), 1981 BMW 745 is equipped with a bigger engine. In terms of performance, 1981 BMW 745 (252 HP @ 5200 RPM) has 37 more horse power than 2005 BMW X5. (215 HP @ 4000 RPM). In normal driving conditions, 1981 BMW 745 should accelerate faster than 2005 BMW X5. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW X5 weights approximately 580 kg more than 1981 BMW 745.
Because 2005 BMW X5 is four wheel drive (4WD), it will have significant more traction and grip than 1981 BMW 745. In wet, icy, snow, or gravel driving conditions, 2005 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, 2005 BMW X5 (520 Nm @ 2000 RPM) has 140 more torque (in Nm) than 1981 BMW 745. (380 Nm @ 2200 RPM). This means 2005 BMW X5 will have an easier job in driving up hills or pulling heavy equipment than 1981 BMW 745.
Compare all specifications:
| 1981 BMW 745 | 2005 BMW X5 | |
| Make | BMW | BMW |
| Model | 745 | X5 |
| Year Released | 1981 | 2005 |
| Body Type | Sedan | SUV |
| Engine Position | Front | Front |
| Engine Size | 3430 cc | 2926 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 252 HP | 215 HP |
| Engine RPM | 5200 RPM | 4000 RPM |
| Torque | 380 Nm | 520 Nm |
| Torque RPM | 2200 RPM | 2000 RPM |
| Engine Bore Size | 92 mm | 84 mm |
| Engine Stroke Size | 86 mm | 90 mm |
| Engine Compression Ratio | 8.0:1 | 18.0:1 |
| Top Speed | 220 km/hour | 210 km/hour |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1590 kg | 2170 kg |
| Vehicle Length | 4870 mm | 4670 mm |
| Vehicle Width | 1810 mm | 1880 mm |
| Vehicle Height | 1440 mm | 1720 mm |
| Wheelbase Size | 2800 mm | 2830 mm |
| Fuel Tank Capacity | 100 L | 93 L |
