1981 BMW 520 vs. 2006 Infiniti QX4
To start off, 2006 Infiniti QX4 is newer by 25 year(s). Which means there will be less support and parts availability for 1981 BMW 520. In addition, the cost of maintenance, including insurance, on 1981 BMW 520 would be higher. At 5,552 cc (8 cylinders), 2006 Infiniti QX4 is equipped with a bigger engine. In terms of performance, 2006 Infiniti QX4 (315 HP @ 4900 RPM) has 192 more horse power than 1981 BMW 520. (123 HP @ 5800 RPM) In normal driving conditions, 2006 Infiniti QX4 should accelerate faster than 1981 BMW 520. With that said, vehicle weight also plays an important factor in acceleration. 2006 Infiniti QX4 weights approximately 100 kg more than 1981 BMW 520. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2006 Infiniti QX4 is four wheel drive (4WD), it will have significant more traction and grip than 1981 BMW 520. In wet, icy, snow, or gravel driving conditions, 2006 Infiniti QX4 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, 2006 Infiniti QX4 (530 Nm @ 3600 RPM) has 360 more torque (in Nm) than 1981 BMW 520. (170 Nm @ 4000 RPM). This means 2006 Infiniti QX4 will have an easier job in driving up hills or pulling heavy equipment than 1981 BMW 520. 2006 Infiniti QX4 has automatic transmission and 1981 BMW 520 has manual transmission. 1981 BMW 520 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2006 Infiniti QX4 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 1981 BMW 520 | 2006 Infiniti QX4 | |
| Make | BMW | Infiniti |
| Model | 520 | QX4 |
| Year Released | 1981 | 2006 |
| Body Type | Sedan | SUV |
| Engine Position | Front | Front |
| Engine Size | 1991 cc | 5552 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 123 HP | 315 HP |
| Engine RPM | 5800 RPM | 4900 RPM |
| Torque | 170 Nm | 530 Nm |
| Torque RPM | 4000 RPM | 3600 RPM |
| Engine Bore Size | 80 mm | 98 mm |
| Engine Stroke Size | 66 mm | 92 mm |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 7 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1220 kg | 1320 kg |
| Vehicle Length | 4630 mm | 5260 mm |
| Vehicle Width | 1710 mm | 2010 mm |
| Vehicle Height | 1430 mm | 1960 mm |
| Wheelbase Size | 2630 mm | 3140 mm |
| Fuel Tank Capacity | 70 L | 60 L |
