2009 Audi A4 vs. 1971 Citroen SM
To start off, 2009 Audi A4 is newer by 38 year(s). Which means there will be less support and parts availability for 1971 Citroen SM. In addition, the cost of maintenance, including insurance, on 1971 Citroen SM would be higher. At 2,670 cc (6 cylinders), 1971 Citroen SM is equipped with a bigger engine. In terms of performance, 1971 Citroen SM (158 HP @ 5500 RPM) has 17 more horse power than 2009 Audi A4. (141 HP @ 4200 RPM) In normal driving conditions, 1971 Citroen SM should accelerate faster than 2009 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A4 weights approximately 70 kg more than 1971 Citroen SM.
Both vehicles are front wheel drive (FWD). Which offers better traction when its slippery than rear 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 Audi A4 (320 Nm @ 1750 RPM) has 85 more torque (in Nm) than 1971 Citroen SM. (235 Nm @ 4000 RPM). This means 2009 Audi A4 will have an easier job in driving up hills or pulling heavy equipment than 1971 Citroen SM.
Compare all specifications:
| 2009 Audi A4 | 1971 Citroen SM | |
| Make | Audi | Citroen |
| Model | A4 | SM |
| Year Released | 2009 | 1971 |
| Body Type | Station Wagon | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1968 cc | 2670 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 141 HP | 158 HP |
| Engine RPM | 4200 RPM | 5500 RPM |
| Torque | 320 Nm | 235 Nm |
| Torque RPM | 1750 RPM | 4000 RPM |
| Fuel Type | Diesel | Gasoline |
| Drive Type | Front | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1520 kg | 1450 kg |
| Vehicle Length | 4710 mm | 4900 mm |
| Vehicle Width | 1830 mm | 1850 mm |
| Vehicle Height | 1440 mm | 1330 mm |
| Wheelbase Size | 2810 mm | 2950 mm |
| Fuel Tank Capacity | 70 L | 89 L |
