Comparison Alfa Romeo 159 1.9 JTDM 16V (150 Hp) Q-Tronic & Opel Signum (facelift 2005) 3.0 V6 CDTI (184 Hp) & Audi A6 Avant (4A,C4) 2.8 V6 30V (193 Hp)
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| Brand: | Alfa Romeo | Opel | Audi |
| Model: | 159 | Signum | A6 |
| Generation: | 159 | Signum (facelift 2005) | A6 Avant (4A,C4) |
| Engine / modification: | 1.9 JTDM 16V (150 Hp) Q-Tronic | 3.0 V6 CDTI (184 Hp) | 2.8 V6 30V (193 Hp) |
| Production start: | 2006 year | 2005 year | 1995 year |
| Production end: | 2010 year | 2008 year | 1997 year |
| Coupe type: | Sedan | Hatchback | Combi |
| Num. of Doors: | 4 | 5 | 5 |
| Num. of seats: | 5 | 5 | 5 |
| Fuel consumption / economy - urban: | 9.9 l/100 km | 9.9 l/100 km | 12.1 l/100 km |
| Fuel consumption / economy - extra urban: | 5.5 l/100 km | 5.3 l/100 km | 7.1 l/100 km |
| Fuel consumption / economy - combined: | 7.1 l/100 km | 7 l/100 km | 9.0 l/100 km |
| Fuel Type: | Diesel | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | 0.34 | |
| Fuel tank volume: | 70 l | 60 l | 80 l |
| Emission standard: | Euro 4 | ||
| CO2 emissions: | 187 g/km | ||
| Power: | 150 hp | 184 hp | 193 hp |
| Max power in: | 4000 rpm. | 4000 rpm. | 6000 rpm. |
| Maximum speed: | 209 km/h | 224 km/h | 227 km/h |
| Acceleration from 0 to 100 km/h: | 9.5 sec | 9.2 sec | 8.3 sec |
| Torque: | 320 Nm @ 2000 rpm. | 370 Nm @ 1900 rpm. | 280 Nm @ 3200 rpm. |
| Model Engine: | 939A2000 | Z30DT | ACK |
| Engine position: | Front, transverse | Front, transverse | Front, longitudinal |
| Engine displacement: | 1910 cm3 | 2958 cm3 | 2771 cm3 |
| Engine oil capacity: | 4.6 l | 7.5 l | 5.5 l |
| Coolant: | 7.5 l | 8.5 l | |
| Fuel System: | Diesel Commonrail | Diesel Commonrail | Multi-point injection |
| Aspiration / Turbine: | Turbocharging | Turbocharging | |
| Position of cylinders: | Inline | V engine | V engine |
| Valvetrain: | DOHC | DOHC | OHC |
| Number of cylinders: | 4 | 6 | 6 |
| Number of valves per cylinder: | 4 | 4 | 5 |
| Compression ratio: | 18.5 | 18.5 | 10.6 |
| Piston Stroke: | 90.4 mm | 82 mm | 86.4 mm |
| Cylinder Bore: | 82 mm | 87.5 mm | 82.5 mm |
| Wheel Drive: | Front wheel drive | Front wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 6 | 4 | |
| Number of Gears (manual transmission): | 6 | 5 | |
| Length: | 4660 mm | 4651 mm | 4797 mm |
| Width: | 1828 mm | 1798 mm | 1783 mm |
| Height: | 1417-1422 mm | 1460 mm | 1440 mm |
| Wheelbase: | 2700 mm | 2830 mm | 2687 mm |
| Front track: | 1578 mm | 1535 mm | 1524 mm |
| Rear (Back) track: | 1555 mm | 1525 mm | 1524 mm |
| Front overhang: | 1000 mm | ||
| Rear overhang: | 960 mm | ||
| Minimum volume of Luggage (trunk): | 405 l | 365 l | 390 l |
| Maximum amount of Luggage (trunk): | 1410 l | 1310 l | |
| Front suspension: | Independent multi-link | Coil spring | Independent, Spring McPherson, with stabilizer |
| Rear suspension: | Independent multi-link | Helical spring | Semi-independent, spring |
| Max weight: | 2045 kg | 2185 kg | 2050 kg |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc | Disc |
| Kerb Weight: | 1495 kg | 1670 kg | 1500 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Hydraulic Steering | Hydraulic Steering |
| Max. roof load: | 80 kg | 100 kg | |
| Permitted trailer load with brakes (8%): | 1900 kg | ||
| Minimum turning circle (turning diameter): | 11.1 m | 11.4 m | |
| Permitted trailer load with brakes (12%): | 1500 kg | 1500 kg | |
| Permitted trailer load without brakes: | 750 kg | ||
| Permitted towbar download: | 60 kg | 50 kg | |
| Tire size: | 215/55 R 16 | 215/55 R16 | 205/60 R15 |
| Wheel rims size: | 7 J x 16 | 6.5J x 16 | 6J x 15 |