Comparison Mercedes-Benz S-class Long (W221) S 450 (340 Hp) 4MATIC G-TRONIC & Mercedes-Benz SLK (R171, facelift 2008) SLK 200 Kompressor (184 Hp) Automatic
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| Brand: | Mercedes-Benz | Mercedes-Benz |
| Model: | S-class | SLK |
| Generation: | S-class Long (W221) | SLK (R171, facelift 2008) |
| Engine / modification: | S 450 (340 Hp) 4MATIC G-TRONIC | SLK 200 Kompressor (184 Hp) Automatic |
| Production start: | 2006 year | 2008 year |
| Production end: | 2009 year | 2011 year |
| Coupe type: | Sedan | Roadster |
| Num. of Doors: | 4 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - urban: | 17-17.2 l/100 km | |
| Fuel consumption / economy - extra urban: | 8.6-8.8 l/100 km | |
| Fuel consumption / economy - combined: | 11.7-11.9 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 90 l | 70 l |
| Emission standard: | Euro 5 | |
| CO2 emissions: | 279-284 g/km | |
| Power: | 340 hp | 184 hp |
| Max power in: | 6000 rpm. | 5500 rpm. |
| Maximum speed: | 250 km/h | 232 km/h |
| Acceleration from 0 to 100 km/h: | 5.9 sec | 7.9 sec |
| Torque: | 460 Nm @ 2700-5000 rpm. | 250 Nm @ 2800-5000 rpm. |
| Model Engine: | M 271.954 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4663 cm3 | 1796 cm3 |
| Engine oil capacity: | 5.5 l | |
| Fuel System: | Multi-point injection | |
| Aspiration / Turbine: | Mechanical supercharging (Compressor) | |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC | |
| Number of cylinders: | 8 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10.5 | 8.5 |
| Piston Stroke: | 86 mm | 85 mm |
| Cylinder Bore: | 92.9 mm | 82 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 5 |
| Length: | 5209 mm | 4107 mm |
| Width: | 1872 mm | 1777 mm |
| Width including mirrors: | 2115 mm | 2005 mm |
| Height: | 1473 mm | 1296 mm |
| Wheelbase: | 3165 mm | 2430 mm |
| Front track: | 1604 mm | |
| Rear (Back) track: | 1606 mm | |
| Front overhang: | 871 mm | |
| Rear overhang: | 1173 mm | |
| Minimum volume of Luggage (trunk): | 208 l | |
| Maximum amount of Luggage (trunk): | 560 l | |
| Front suspension: | Pneumatic elastic element | |
| Rear suspension: | Pneumatic elastic element | |
| Max weight: | 2640 kg | 1705 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1980 kg | 1340 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | |
| Max. roof load: | 50 kg | |
| Minimum turning circle (turning diameter): | 12.2 m | 10.51 m |
| Tire size: | 235/55 R17 | 205/55 R 16 |
| Wheel rims size: | R17 | 7 J x 16 |