Comparison BMW Z4 (E89) 30i (258 Hp) sDrive Sport-Automatic & BMW 6 Series Convertible (F12 LCI, facelift 2015) 650i (450 Hp) xDrive Steptronic
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| Brand: | BMW | BMW |
| Model: | Z4 | 6 Series |
| Generation: | Z4 (E89) | 6 Series Convertible (F12 LCI, facelift 2015) |
| Engine / modification: | 30i (258 Hp) sDrive Sport-Automatic | 650i (450 Hp) xDrive Steptronic |
| Production start: | 2009 year | 2015 year |
| Production end: | 2011 year | 2018 year |
| Coupe type: | Cabriolet | Cabriolet |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 2 | 4 |
| Fuel consumption / economy - urban: | 11.9 l/100 km | 13.0-13.2 l/100 km |
| Fuel consumption / economy - extra urban: | 6.2 l/100 km | 7.1-7.3 l/100 km |
| Fuel consumption / economy - combined: | 8.3 l/100 km | 9.3-9.5 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 55 l | 70 l |
| Emission standard: | Euro 5 | Euro 6 |
| CO2 emissions: | 217-221 g/km | |
| Power: | 258 hp | 450 hp |
| Max power in: | 6600 rpm. | 5500-6000 rpm. |
| Maximum speed: | 250 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 6.1 sec | 4.5 sec |
| Torque: | 310 Nm @ 2600-3000 rpm. | 650 Nm @ 2000-4500 rpm. |
| Model Engine: | N52B30 | N63B44 |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2996 cm3 | 4395 cm3 |
| Engine oil capacity: | 6.5 l | 9.5 l |
| Coolant: | 8.5 l | 14.4 l |
| Fuel System: | Multi-point injection | Direct injection |
| Aspiration / Turbine: | Twin-power turbo | |
| Position of cylinders: | Inline | V engine |
| Valvetrain: | DOHC | |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10.7 | 10 |
| Piston Stroke: | 88 mm | 88.3 mm |
| Cylinder Bore: | 85 mm | 89 mm |
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 8 Steptronic | |
| Number of Gears (manual transmission): | 6 | |
| Length: | 4239 mm | 4894 mm |
| Width: | 1790 mm | 1894 mm |
| Height: | 1291 mm | 1365 mm |
| Wheelbase: | 2496 mm | 2855 mm |
| Front track: | 1511 mm | 1600 mm |
| Rear (Back) track: | 1537 mm | 1665 mm |
| Ride height(clearance): | 123 mm | |
| Minimum volume of Luggage (trunk): | 180 l | 300 l |
| Maximum amount of Luggage (trunk): | 310 l | 350 l |
| Front suspension: | The depreciated rack | Double wishbone |
| Rear suspension: | Helical spring | Multi-link independent |
| Max weight: | 1760 kg | 2480 kg |
| Front brakes: | Ventilated discs | Disc |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 1505 kg | 1980 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering |
| Minimum turning circle (turning diameter): | 9.8 m | 11.7 m |
| Tire size: | 225/45 R17 | 245/45 R18; 275/45 R18; 245/40 R19; 275/35 R19; 245/35 R20; 275/30 R20 |
| Wheel rims size: | 8J x 17 | 8J x 18; 9J x 18; 8.5J x 19; 9J x 19; 8.5J x 20; 9J x 20 |