2009 Audi A6 vs. 1971 Citroen SM
To start off, 2009 Audi A6 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 10 more horse power than 2009 Audi A6. (148 HP @ 5700 RPM) In normal driving conditions, 1971 Citroen SM should accelerate faster than 2009 Audi A6. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A6 weights approximately 145 kg more than 1971 Citroen SM.
Because 2009 Audi A6 is four wheel drive (4WD), it will have significant more traction and grip than 1971 Citroen SM. In wet, icy, snow, or gravel driving conditions, 2009 Audi A6 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, 1971 Citroen SM (235 Nm @ 4000 RPM) has 25 more torque (in Nm) than 2009 Audi A6. (210 Nm @ 1750 RPM). This means 1971 Citroen SM will have an easier job in driving up hills or pulling heavy equipment than 2009 Audi A6.
Compare all specifications:
| 2009 Audi A6 | 1971 Citroen SM | |
| Make | Audi | Citroen |
| Model | A6 | SM |
| Year Released | 2009 | 1971 |
| Body Type | Station Wagon | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1779 cc | 2670 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 5 valves | 2 valves |
| Horse Power | 148 HP | 158 HP |
| Engine RPM | 5700 RPM | 5500 RPM |
| Torque | 210 Nm | 235 Nm |
| Torque RPM | 1750 RPM | 4000 RPM |
| Engine Bore Size | 81 mm | 87 mm |
| Engine Stroke Size | 86.4 mm | 75 mm |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | 4WD | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1595 kg | 1450 kg |
| Vehicle Length | 4800 mm | 4900 mm |
| Vehicle Width | 1820 mm | 1850 mm |
| Vehicle Height | 1460 mm | 1330 mm |
| Wheelbase Size | 2770 mm | 2950 mm |
| Fuel Tank Capacity | 70 L | 89 L |
