Comparison BMW 6 Series (E63) 645 Ci (333 Hp) Automatic & BMW Z4 (G29) 30i (258 Hp) sDrive Steptronic & BMW X4 (G02 LCI, facelift 2021) 30i (245 Hp) MHEV xDrive Steptronic
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| Brand: | BMW | BMW | BMW |
| Model: | 6 Series | Z4 | X4 |
| Generation: | 6 Series (E63) | Z4 (G29) | X4 (G02 LCI, facelift 2021) |
| Engine / modification: | 645 Ci (333 Hp) Automatic | 30i (258 Hp) sDrive Steptronic | 30i (245 Hp) MHEV xDrive Steptronic |
| Production start: | 2003 year | 2018 year | 2021 year |
| Production end: | 2005 year | ||
| Coupe type: | Coupe | Cabriolet | |
| Num. of Doors: | 2 | 2 | 5 |
| Num. of seats: | 2+2 | 2 | 5 |
| Fuel consumption / economy - urban: | 16.1 l/100 km | 7.4 l/100 km | |
| Fuel consumption / economy - extra urban: | 8.0 l/100 km | 4.9-5.3 l/100 km | |
| Fuel consumption / economy - combined: | 10.9 l/100 km | 6.0-6.1 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.29 | 0.29 | 0.29-0.35 |
| Fuel tank volume: | 70 l | 52 l | 65 l |
| Emission standard: | Euro 4 | Euro 6 d | Euro 6d |
| CO2 emissions: | 264 g/km | 137-139 g/km | |
| Power: | 333 hp | 258 hp | 245 hp |
| Max power in: | 6100 rpm. | 5000-6500 rpm. | 5000-6500 rpm. |
| Maximum speed: | 250 km/h | 250 km/h | 235 km/h |
| Acceleration from 0 to 100 km/h: | 5.8 sec | 5.4 sec | 6.6 sec |
| CO2 emissions (WLTP): | 171-192 g/km | ||
| Torque: | 450 Nm @ 3600 rpm. | 400 Nm @ 1550-4400 rpm. | 350 Nm @ 1560-4800 rpm. |
| Model Engine: | N63B44 | B48B20 | |
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4398 cm3 | 1998 cm3 | 1998 cm3 |
| Engine oil capacity: | 8.0 l | 5.25 l | 5.75 l |
| Coolant: | 14.2 l | ||
| Fuel System: | Multi-point injection | Direct injection | Direct injection |
| Aspiration / Turbine: | Twin-power turbo | ||
| Position of cylinders: | V engine | Inline | Inline |
| Valvetrain: | DOHC | VALVETRONIC, Double VANOS | |
| Number of cylinders: | 8 | 4 | 4 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 10 | 10.2 | 10.2 |
| Piston Stroke: | 82.7 mm | 94.6 mm | 94.6 mm |
| Cylinder Bore: | 92 mm | 82 mm | 82 mm |
| Electric motor power: | 11 | ||
| Wheel Drive: | Rear wheel drive | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 6 | 8 Steptronic | 8 Steptronic |
| Length: | 4820 mm | 4324 mm | 4751 mm |
| Width: | 1855 mm | 1864 mm | 1918 mm |
| Width including mirrors: | 2024 mm | ||
| Height: | 1373 mm | 1304 mm | 1621 mm |
| Wheelbase: | 2780 mm | 2470 mm | 2864 mm |
| Front track: | 1558 mm | 1609 mm | 1620 mm |
| Rear (Back) track: | 1592 mm | 1616 mm | 1666 mm |
| Ride height(clearance): | 117 mm | 204 mm | |
| Approach angle: | 25 ° | ||
| Departure angle: | 22.2 ° | ||
| Ramp angle: | 20 ° | ||
| Front overhang: | 907 mm | ||
| Rear overhang: | 947 mm | ||
| Wading depth: | 500 mm | ||
| Minimum volume of Luggage (trunk): | 450 l | 281 l | 525 l |
| Maximum amount of Luggage (trunk): | 1430 l | ||
| Front suspension: | Coil spring | Double wishbone | |
| Rear suspension: | Helical spring | Multi-link independent | Independent multi-link |
| Max weight: | 2065 kg | 1740 kg | 2400 kg |
| Front brakes: | Disc | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs | Ventilated discs |
| Kerb Weight: | 1695 kg | 1415 kg | 1815 kg |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | Electric Steering | Electric Steering |
| Max. roof load: | 100 kg | ||
| Minimum turning circle (turning diameter): | 11.4 m | 11.0 m | 12.1 m |
| Permitted trailer load with brakes (12%): | 2400 kg | ||
| Permitted trailer load without brakes: | 750 kg | ||
| Permitted towbar download: | 100 kg | ||
| Tire size: | 245/45 R18 | 225/50 R17; 255/45 R17 | 225/60 R18 |
| Wheel rims size: | 8J X 18 | 7.5J x 17; 8.5J x 17 | 7J x 18 |