2007 Audi A4 vs. 1973 Citroen SM
To start off, 2007 Audi A4 is newer by 34 year(s). Which means there will be less support and parts availability for 1973 Citroen SM. In addition, the cost of maintenance, including insurance, on 1973 Citroen SM would be higher. At 2,670 cc (6 cylinders), 1973 Citroen SM is equipped with a bigger engine. In terms of performance, 2007 Audi A4 (197 HP @ 5100 RPM) has 26 more horse power than 1973 Citroen SM. (171 HP @ 5500 RPM). In normal driving conditions, 2007 Audi A4 should accelerate faster than 1973 Citroen SM. With that said, vehicle weight also plays an important factor in acceleration. 2007 Audi A4 weights approximately 180 kg more than 1973 Citroen SM. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
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, 2007 Audi A4 (280 Nm @ 1800 RPM) has 43 more torque (in Nm) than 1973 Citroen SM. (237 Nm @ 4000 RPM). This means 2007 Audi A4 will have an easier job in driving up hills or pulling heavy equipment than 1973 Citroen SM.
Compare all specifications:
| 2007 Audi A4 | 1973 Citroen SM | |
| Make | Audi | Citroen |
| Model | A4 | SM |
| Year Released | 2007 | 1973 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1984 cc | 2670 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 2 valves |
| Horse Power | 197 HP | 171 HP |
| Engine RPM | 5100 RPM | 5500 RPM |
| Torque | 280 Nm | 237 Nm |
| Torque RPM | 1800 RPM | 4000 RPM |
| Engine Bore Size | 82.5 mm | 87 mm |
| Engine Stroke Size | 92.8 mm | 75 mm |
| Engine Compression Ratio | 10.5:1 | 9.0:1 |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Front | Front |
| Number of Seats | 4 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1630 kg | 1450 kg |
| Vehicle Length | 4580 mm | 4900 mm |
| Vehicle Width | 1400 mm | 1850 mm |
| Vehicle Height | 1780 mm | 1330 mm |
| Wheelbase Size | 2660 mm | 2960 mm |
| Fuel Tank Capacity | 70 L | 25 L |
