2009 Audi A4 vs. 1981 BMW 725
To start off, 2009 Audi A4 is newer by 28 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 3,189 cc (6 cylinders), 2009 Audi A4 is equipped with a bigger engine. In terms of performance, 2009 Audi A4 (252 HP @ 6500 RPM) has 104 more horse power than 1981 BMW 725. (148 HP @ 5500 RPM). In normal driving conditions, 2009 Audi A4 should accelerate faster than 1981 BMW 725.
Because 2009 Audi A4 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, 2009 Audi A4 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, 2009 Audi A4 (330 Nm @ 3250 RPM) has 115 more torque (in Nm) than 1981 BMW 725. (215 Nm @ 4000 RPM). This means 2009 Audi A4 will have an easier job in driving up hills or pulling heavy equipment than 1981 BMW 725.
Compare all specifications:
| 2009 Audi A4 | 1981 BMW 725 | |
| Make | Audi | BMW |
| Model | A4 | 725 |
| Year Released | 2009 | 1981 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 3189 cc | 2493 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 252 HP | 148 HP |
| Engine RPM | 6500 RPM | 5500 RPM |
| Torque | 330 Nm | 215 Nm |
| Torque RPM | 3250 RPM | 4000 RPM |
| Engine Bore Size | 84.5 mm | 86 mm |
| Engine Stroke Size | 92.8 mm | 71.6 mm |
| Engine Compression Ratio | 12.5:1 | 9.6:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | 4WD | Rear |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Length | 4550 mm | 4870 mm |
| Vehicle Width | 1780 mm | 1810 mm |
| Vehicle Height | 1430 mm | 1440 mm |
| Wheelbase Size | 2660 mm | 2810 mm |
