2009 BMW Z4 vs. 1984 BMW 725
To start off, 2009 BMW Z4 is newer by 25 year(s). Which means there will be less support and parts availability for 1984 BMW 725. In addition, the cost of maintenance, including insurance, on 1984 BMW 725 would be higher. At 2,497 cc (6 cylinders), 2009 BMW Z4 is equipped with a bigger engine. In terms of performance, 2009 BMW Z4 (176 HP @ 5800 RPM) has 28 more horse power than 1984 BMW 725. (148 HP @ 5500 RPM). In normal driving conditions, 2009 BMW Z4 should accelerate faster than 1984 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, 2009 BMW Z4 (230 Nm @ 3500 RPM) has 15 more torque (in Nm) than 1984 BMW 725. (215 Nm @ 4000 RPM). This means 2009 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 1984 BMW 725.
Compare all specifications:
| 2009 BMW Z4 | 1984 BMW 725 | |
| Make | BMW | BMW |
| Model | Z4 | 725 |
| Year Released | 2009 | 1984 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2497 cc | 2495 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 176 HP | 148 HP |
| Engine RPM | 5800 RPM | 5500 RPM |
| Torque | 230 Nm | 215 Nm |
| Torque RPM | 3500 RPM | 4000 RPM |
| Engine Bore Size | 82 mm | 86 mm |
| Engine Stroke Size | 78.8 mm | 71.6 mm |
| Engine Compression Ratio | 11.0:1 | 9.6:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | Rear | Rear |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Length | 4100 mm | 4870 mm |
| Vehicle Width | 1790 mm | 1810 mm |
| Vehicle Height | 1310 mm | 1440 mm |
| Wheelbase Size | 2500 mm | 2810 mm |
