2001 BMW Z18 vs. 1981 BMW 725
To start off, 2001 BMW Z18 is newer by 20 year(s). Which means there will be less support and parts availability for 1981 BMW 725. In addition, the cost of maintenance, including insurance, on 1981 BMW 725 would be higher. At 4,400 cc (8 cylinders), 2001 BMW Z18 is equipped with a bigger engine. In terms of performance, 2001 BMW Z18 (323 HP @ 7400 RPM) has 175 more horse power than 1981 BMW 725. (148 HP @ 5500 RPM). In normal driving conditions, 2001 BMW Z18 should accelerate faster than 1981 BMW 725.
Because 2001 BMW Z18 is four wheel drive (4WD), it will have significant more traction and grip than 1981 BMW 725. In wet, icy, snow, or gravel driving conditions, 2001 BMW Z18 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, 2001 BMW Z18 (340 Nm) has 125 more torque (in Nm) than 1981 BMW 725. (215 Nm). This means 2001 BMW Z18 will have an easier job in driving up hills or pulling heavy equipment than 1981 BMW 725.
Compare all specifications:
| 2001 BMW Z18 | 1981 BMW 725 | |
| Make | BMW | BMW |
| Model | Z18 | 725 |
| Year Released | 2001 | 1981 |
| Engine Position | Front | Front |
| Engine Size | 4400 cc | 2493 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Horse Power | 323 HP | 148 HP |
| Engine RPM | 7400 RPM | 5500 RPM |
| Torque | 340 Nm | 215 Nm |
| Drive Type | 4WD | Rear |
| Number of Seats | 2 seats | 5 seats |
| Wheelbase Size | 2730 mm | 2810 mm |
