Comparison Alfa Romeo Stelvio Quadrifoglio 2.9 Bi-Turbo V6 (510 Hp) AWD Automatic & Mercedes-Benz S-class Long (W221) S 550 (388 Hp) G-TRONIC
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| Brand: | Alfa Romeo | Mercedes-Benz |
| Model: | Stelvio | S-class |
| Generation: | Stelvio | S-class Long (W221) |
| Engine / modification: | Quadrifoglio 2.9 Bi-Turbo V6 (510 Hp) AWD Automatic | S 550 (388 Hp) G-TRONIC |
| Production start: | 2017 year | 2005 year |
| Production end: | 2018 year | 2009 year |
| Coupe type: | Sedan | |
| Num. of Doors: | 5 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 11.7 l/100 km | 17.7 l/100 km |
| Fuel consumption / economy - extra urban: | 7.5 l/100 km | 8.8 l/100 km |
| Fuel consumption / economy - combined: | 9.0 l/100 km | 12 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Fuel tank volume: | 64 l | 90 l |
| Emission standard: | Euro 6 | |
| CO2 emissions: | 210 g/km | |
| Power: | 510 hp | 388 hp |
| Max power in: | 6500 rpm. | 6000 rpm. |
| Maximum speed: | 283 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 3.8 sec | 5.4 sec |
| Torque: | 600 Nm @ 2500 rpm. | 530 Nm @ 2800 rpm. |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2891 cm3 | 5461 cm3 |
| Engine oil capacity: | 6.5 l | |
| Coolant: | 11.2 l | |
| Fuel System: | Direct injection | Multi-point injection |
| Aspiration / Turbine: | BiTurbo | |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | DOHC | |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 9.31 | 10.7 |
| Piston Stroke: | 82 mm | 90.5 mm |
| Cylinder Bore: | 86.5 mm | 98 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 8 | 7G-TRONIC |
| Length: | 4702 mm | 5209 mm |
| Width: | 1872 mm | |
| Width including mirrors: | 2163 mm | 2115 mm |
| Height: | 1681 mm | 1473 mm |
| Wheelbase: | 2818 mm | 3165 mm |
| Front track: | 1622 mm | 1604 mm |
| Rear (Back) track: | 1675 mm | 1606 mm |
| Front overhang: | 871 mm | |
| Rear overhang: | 1173 mm | |
| Minimum volume of Luggage (trunk): | 560 l | |
| Front suspension: | Double wishbone | Pneumatic elastic element |
| Rear suspension: | Independent, spring multi-link with stabilizer | Pneumatic elastic element |
| Max weight: | 2565 kg | |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1830 kg | 1910 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 12.2 m | |
| Tire size: | 235/55 R17 | |
| Wheel rims size: | 8J x 17 |