2004 Audi A4 vs. 2005 BMW 645
To start off, 2005 BMW 645 is newer by 1 year(s). Which means there will be less support and parts availability for 2004 Audi A4. In addition, the cost of maintenance, including insurance, on 2004 Audi A4 would be higher. At 4,392 cc (8 cylinders), 2005 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (326 HP @ 6100 RPM) has 125 more horse power than 2004 Audi A4. (201 HP @ 3500 RPM) In normal driving conditions, 2005 BMW 645 should accelerate faster than 2004 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 645 weights approximately 285 kg more than 2004 Audi A4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2004 Audi A4 is four wheel drive (4WD), it will have significant more traction and grip than 2005 BMW 645. In wet, icy, snow, or gravel driving conditions, 2004 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, 2004 Audi A4 (451 Nm @ 1400 RPM) has 4 more torque (in Nm) than 2005 BMW 645. (447 Nm @ 3600 RPM). This means 2004 Audi A4 will have an easier job in driving up hills or pulling heavy equipment than 2005 BMW 645.
Compare all specifications:
| 2004 Audi A4 | 2005 BMW 645 | |
| Make | Audi | BMW |
| Model | A4 | 645 |
| Year Released | 2004 | 2005 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2967 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 201 HP | 326 HP |
| Engine RPM | 3500 RPM | 6100 RPM |
| Torque | 451 Nm | 447 Nm |
| Torque RPM | 1400 RPM | 3600 RPM |
| Engine Bore Size | 83 mm | 92 mm |
| Engine Stroke Size | 91.4 mm | 83 mm |
| Fuel Type | Diesel | Gasoline - Premium |
| Top Speed | 235 km/hour | 250 km/hour |
| Acceleration 0-100mph | 7.2 seconds | 6.1 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1610 kg | 1895 kg |
| Vehicle Length | 4590 mm | 4830 mm |
| Vehicle Width | 1770 mm | 1860 mm |
| Vehicle Height | 1430 mm | 1380 mm |
| Wheelbase Size | 2430 mm | 2890 mm |
| Fuel Consumption | 5.8 L/100km | 10.2 L/100km |
| Fuel Consumption City | 10.3 L/100km | 15.7 L/100km |
| Fuel Consumption Overall | 7.5 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 63 L | 70 L |
