2007 Audi A4 vs. 1971 Citroen SM
To start off, 2007 Audi A4 is newer by 36 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, 2007 Audi A4 (161 HP @ 5700 RPM) has 3 more horse power than 1971 Citroen SM. (158 HP @ 5500 RPM). In normal driving conditions, 2007 Audi A4 should accelerate faster than 1971 Citroen SM. With that said, vehicle weight also plays an important factor in acceleration. 2007 Audi A4 weights approximately 20 kg more than 1971 Citroen SM. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2007 Audi A4 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, 2007 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, 1971 Citroen SM (235 Nm @ 4000 RPM) has 10 more torque (in Nm) than 2007 Audi A4. (225 Nm @ 1950 RPM). This means 1971 Citroen SM will have an easier job in driving up hills or pulling heavy equipment than 2007 Audi A4.
Compare all specifications:
| 2007 Audi A4 | 1971 Citroen SM | |
| Make | Audi | Citroen |
| Model | A4 | SM |
| Year Released | 2007 | 1971 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 1780 cc | 2670 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 5 valves | 2 valves |
| Horse Power | 161 HP | 158 HP |
| Engine RPM | 5700 RPM | 5500 RPM |
| Torque | 225 Nm | 235 Nm |
| Torque RPM | 1950 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 | 4 doors | 2 doors |
| Vehicle Weight | 1470 kg | 1450 kg |
| Vehicle Length | 4550 mm | 4900 mm |
| Vehicle Width | 1780 mm | 1850 mm |
| Vehicle Height | 1430 mm | 1330 mm |
| Wheelbase Size | 2650 mm | 2950 mm |
| Fuel Tank Capacity | 63 L | 89 L |
