2009 Audi A8 vs. 1991 Audi 100
To start off, 2009 Audi A8 is newer by 18 year(s). Which means there will be less support and parts availability for 1991 Audi 100. In addition, the cost of maintenance, including insurance, on 1991 Audi 100 would be higher. At 4,134 cc (8 cylinders), 2009 Audi A8 is equipped with a bigger engine. In terms of performance, 2009 Audi A8 (322 HP @ 3750 RPM) has 150 more horse power than 1991 Audi 100. (172 HP @ 5500 RPM). In normal driving conditions, 2009 Audi A8 should accelerate faster than 1991 Audi 100. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A8 weights approximately 439 kg more than 1991 Audi 100. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 2009 Audi A8 (650 Nm @ 1600 RPM) has 400 more torque (in Nm) than 1991 Audi 100. (250 Nm @ 3000 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 1991 Audi 100.
Compare all specifications:
| 2009 Audi A8 | 1991 Audi 100 | |
| Make | Audi | Audi |
| Model | A8 | 100 |
| Year Released | 2009 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 4134 cc | 2771 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Horse Power | 322 HP | 172 HP |
| Engine RPM | 3750 RPM | 5500 RPM |
| Torque | 650 Nm | 250 Nm |
| Torque RPM | 1600 RPM | 3000 RPM |
| Engine Bore Size | 83 mm | 82.5 mm |
| Engine Stroke Size | 95.5 mm | 86.4 mm |
| Fuel Type | Diesel | Gasoline |
| Number of Seats | 5 seats | 5 seats |
| Vehicle Weight | 1945 kg | 1506 kg |
| Vehicle Length | 5070 mm | 4800 mm |
| Vehicle Width | 1900 mm | 1780 mm |
| Vehicle Height | 1450 mm | 1450 mm |
