1981 BMW 725 vs. 2012 BMW Z4
To start off, 2012 BMW Z4 is newer by 31 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 3,000 cc (6 cylinders), 2012 BMW Z4 is equipped with a bigger engine. In terms of performance, 2012 BMW Z4 (255 HP @ 6600 RPM) has 107 more horse power than 1981 BMW 725. (148 HP @ 5500 RPM) In normal driving conditions, 2012 BMW Z4 should accelerate faster than 1981 BMW 725.
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, 2012 BMW Z4 (298 Nm @ 2600 RPM) has 83 more torque (in Nm) than 1981 BMW 725. (215 Nm @ 4000 RPM). This means 2012 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 1981 BMW 725.
Compare all specifications:
| 1981 BMW 725 | 2012 BMW Z4 | |
| Make | BMW | BMW |
| Model | 725 | Z4 |
| Year Released | 1981 | 2012 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2493 cc | 3000 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 148 HP | 255 HP |
| Engine RPM | 5500 RPM | 6600 RPM |
| Torque | 215 Nm | 298 Nm |
| Torque RPM | 4000 RPM | 2600 RPM |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Number of Seats | 5 seats | 2 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Length | 4870 mm | 4239 mm |
| Vehicle Width | 1810 mm | 1791 mm |
| Vehicle Height | 1440 mm | 1290 mm |
| Wheelbase Size | 2810 mm | 2497 mm |
