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 & GMC Sierra HD Double Cab Long Box 3500 6.6 TD V8 (445 Hp) SRW Automatic
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| Brand: | Alfa Romeo | Mercedes-Benz | GMC |
| Model: | Stelvio | S-class | Sierra 2500HD |
| Generation: | Stelvio | S-class Long (W221) | Sierra HD Double Cab Long Box |
| Engine / modification: | Quadrifoglio 2.9 Bi-Turbo V6 (510 Hp) AWD Automatic | S 550 (388 Hp) G-TRONIC | 3500 6.6 TD V8 (445 Hp) SRW Automatic |
| Production start: | 2017 year | 2005 year | 2018 year |
| Production end: | 2018 year | 2009 year | |
| Coupe type: | Sedan | Pick-up | |
| Num. of Doors: | 5 | 4 | 4 |
| Num. of seats: | 5 | 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) | Diesel |
| Fuel tank volume: | 64 l | 90 l | 136 l |
| Emission standard: | Euro 6 | ||
| CO2 emissions: | 210 g/km | ||
| Power: | 510 hp | 388 hp | 445 hp |
| Max power in: | 6500 rpm. | 6000 rpm. | 2800 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. | 1234 Nm @ 1600 rpm. |
| Model Engine: | DURAMAX L5P | ||
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2891 cm3 | 5461 cm3 | 6588 cm3 |
| Engine oil capacity: | 6.5 l | 9.5 l | |
| Coolant: | 11.2 l | ||
| Fuel System: | Direct injection | Multi-point injection | Diesel Commonrail |
| Aspiration / Turbine: | BiTurbo | Turbocharger | |
| Position of cylinders: | V engine | V engine | V engine |
| Valvetrain: | DOHC | ||
| Number of cylinders: | 6 | 8 | 8 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 9.31 | 10.7 | 16 |
| Piston Stroke: | 82 mm | 90.5 mm | 99 mm |
| Cylinder Bore: | 86.5 mm | 98 mm | 103 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 8 | 7G-TRONIC | 6 |
| Length: | 4702 mm | 5209 mm | 6322 mm |
| Width: | 1872 mm | ||
| Width including mirrors: | 2163 mm | 2115 mm | 2045 mm |
| Height: | 1681 mm | 1473 mm | 1978 mm |
| Wheelbase: | 2818 mm | 3165 mm | 4017 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 | ||
| Maximum amount of Luggage (trunk): | 2160 l | ||
| Front suspension: | Double wishbone | Pneumatic elastic element | Torsion |
| Rear suspension: | Independent, spring multi-link with stabilizer | Pneumatic elastic element | The spring |
| Max weight: | 2565 kg | 5080 kg | |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1830 kg | 1910 kg | 3304 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering | |
| Minimum turning circle (turning diameter): | 12.2 m | ||
| Permitted trailer load with brakes (12%): | 6577 kg | ||
| Tire size: | 235/55 R17 | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 | |
| Wheel rims size: | 8J x 17 | 7J x 17; 7.5J x 17; 8J x 18; 8J x 20 |