2007 Audi A3 vs. 2005 BMW 645
To start off, 2007 Audi A3 is newer by 2 year(s). Which means there will be less support and parts availability for 2005 BMW 645. In addition, the cost of maintenance, including insurance, on 2005 BMW 645 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 91 more horse power than 2007 Audi A3. (247 HP @ 6300 RPM) In normal driving conditions, 2005 BMW 645 should accelerate faster than 2007 Audi A3. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 645 weights approximately 160 kg more than 2007 Audi A3. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2007 Audi A3 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, 2007 Audi A3 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 119 more torque (in Nm) than 2007 Audi A3. (320 Nm @ 2500 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2007 Audi A3.
Compare all specifications:
| 2007 Audi A3 | 2005 BMW 645 | |
| Make | Audi | BMW |
| Model | A3 | 645 |
| Year Released | 2007 | 2005 |
| Body Type | Hatchback | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3189 cc | 4390 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 247 HP | 338 HP |
| Engine RPM | 6300 RPM | 6100 RPM |
| Torque | 320 Nm | 439 Nm |
| Torque RPM | 2500 RPM | 3600 RPM |
| Engine Compression Ratio | 11.3:1 | 10.5:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 240 km/hour | 250 km/hour |
| Acceleration 0-100mph | 6.5 seconds | 5.6 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 3 doors | 2 doors |
| Vehicle Weight | 1555 kg | 1715 kg |
| Vehicle Length | 4210 mm | 4830 mm |
| Vehicle Width | 1770 mm | 1860 mm |
| Vehicle Height | 1430 mm | 1380 mm |
| Wheelbase Size | 2580 mm | 2790 mm |
| Fuel Consumption Overall | 10.6 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 55 L | 70 L |
