1999 Audi S8 vs. 2005 BMW 645
To start off, 2005 BMW 645 is newer by 6 year(s). Which means there will be less support and parts availability for 1999 Audi S8. In addition, the cost of maintenance, including insurance, on 1999 Audi S8 would be higher. At 4,390 cc (8 cylinders), 2005 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (338 HP @ 6100 RPM) has 3 more horse power than 1999 Audi S8. (335 HP @ 7000 RPM) In normal driving conditions, 2005 BMW 645 should accelerate faster than 1999 Audi S8. With that said, vehicle weight also plays an important factor in acceleration. 1999 Audi S8 weights approximately 15 kg more than 2005 BMW 645.
Because 1999 Audi S8 is all wheel drive (AWD), it will have significant more traction and grip than 2005 BMW 645. In wet, icy, snow, or gravel driving conditions, 1999 Audi S8 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, 2005 BMW 645 (439 Nm @ 3600 RPM) has 108 more torque (in Nm) than 1999 Audi S8. (331 Nm @ 3400 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1999 Audi S8.
Compare all specifications:
| 1999 Audi S8 | 2005 BMW 645 | |
| Make | Audi | BMW |
| Model | S8 | 645 |
| Year Released | 1999 | 2005 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 4172 cc | 4390 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Horse Power | 335 HP | 338 HP |
| Engine RPM | 7000 RPM | 6100 RPM |
| Torque | 331 Nm | 439 Nm |
| Torque RPM | 3400 RPM | 3600 RPM |
| Engine Bore Size | 84.5 mm | 92 mm |
| Engine Stroke Size | 93 mm | 83 mm |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5.4 seconds | 5.6 seconds |
| Drive Type | AWD | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1730 kg | 1715 kg |
| Vehicle Length | 5040 mm | 4830 mm |
| Vehicle Width | 1890 mm | 1860 mm |
| Vehicle Height | 1420 mm | 1380 mm |
| Wheelbase Size | 2890 mm | 2790 mm |
| Fuel Consumption Highway | 9.7 L/100km | 9.4 L/100km |
| Fuel Consumption City | 20.8 L/100km | 13.8 L/100km |
| Fuel Consumption Overall | 13.7 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
