1999 Audi S8 vs. 1991 Ford Sierra
To start off, 1999 Audi S8 is newer by 8 year(s). Which means there will be less support and parts availability for 1991 Ford Sierra. In addition, the cost of maintenance, including insurance, on 1991 Ford Sierra would be higher. At 4,170 cc (8 cylinders), 1999 Audi S8 is equipped with a bigger engine. In terms of performance, 1999 Audi S8 (247 HP @ 7000 RPM) has 172 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM). In normal driving conditions, 1999 Audi S8 should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 1999 Audi S8 weights approximately 605 kg more than 1991 Ford Sierra. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 1999 Audi S8 (330 Nm @ 3400 RPM) has 178 more torque (in Nm) than 1991 Ford Sierra. (152 Nm @ 2200 RPM). This means 1999 Audi S8 will have an easier job in driving up hills or pulling heavy equipment than 1991 Ford Sierra.
Compare all specifications:
| 1999 Audi S8 | 1991 Ford Sierra | |
| Make | Audi | Ford |
| Model | S8 | Sierra |
| Year Released | 1999 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 4170 cc | 1751 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Horse Power | 247 HP | 75 HP |
| Engine RPM | 7000 RPM | 4500 RPM |
| Torque | 330 Nm | 152 Nm |
| Torque RPM | 3400 RPM | 2200 RPM |
| Engine Bore Size | 84.5 mm | 82.5 mm |
| Engine Stroke Size | 93 mm | 82 mm |
| Engine Compression Ratio | 11.0:1 | 21.5:1 |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1750 kg | 1145 kg |
| Vehicle Length | 5040 mm | 4430 mm |
| Vehicle Width | 1890 mm | 1700 mm |
| Vehicle Height | 1420 mm | 1370 mm |
| Wheelbase Size | 2890 mm | 2620 mm |
| Fuel Tank Capacity | 90 L | 60 L |
