Comparison BMW Z4 (E85, facelift 2006) 2.5i (177 Hp) & Volkswagen Bora Variant (1J6) 1.9 TDI (100 Hp) & Opel Astra H Caravan 1.8i 16V (140 Hp) Automatic
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| Brand: | BMW | Volkswagen | Opel |
| Model: | Z4 | Bora | Astra |
| Generation: | Z4 (E85, facelift 2006) | Bora Variant (1J6) | Astra H Caravan |
| Engine / modification: | 2.5i (177 Hp) | 1.9 TDI (100 Hp) | 1.8i 16V (140 Hp) Automatic |
| Production start: | 2006 year | 2000 year | 2006 year |
| Production end: | 2008 year | 2005 year | 2010 year |
| Coupe type: | Cabriolet | Combi | Combi |
| Num. of Doors: | 2 | 5 | 5 |
| Num. of seats: | 2 | 5 | 5 |
| Fuel consumption / economy - urban: | 11.8 l/100 km | 6.5 l/100 km | 11.4 l/100 km |
| Fuel consumption / economy - extra urban: | 6.1 l/100 km | 4.0 l/100 km | 6.3 l/100 km |
| Fuel consumption / economy - combined: | 6.0 l/100 km | 8.2 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.31 | ||
| Fuel tank volume: | 55 l | 55 l | 52 l |
| Emission standard: | Euro 3 | Euro 4 | |
| CO2 emissions: | 187 g/km | ||
| Power: | 177 hp | 100 hp | 140 hp |
| Max power in: | 5800 rpm. | 4000 rpm. | 6300 rpm. |
| Maximum speed: | 229 km/h | 188 km/h | 188 km/h |
| Acceleration from 0 to 100 km/h: | 7.1 sec | 12.8 sec | 11.7 sec |
| Torque: | 230 Nm @ 3500 rpm. | 240 Nm @ 1800 rpm. | 175 Nm @ 3800 rpm. |
| Model Engine: | N52B25 | ATD, AXR, BEW | Z18XER |
| Engine position: | Front, longitudinal | Front, transverse | Front, transverse |
| Engine displacement: | 2497 cm3 | 1896 cm3 | 1796 cm3 |
| Engine oil capacity: | 6.5 l | 4.5 l | 4.5 l |
| Coolant: | 6 l | ||
| Fuel System: | Multi-point injection | Pump-nozzle (Unit Injector) | Multi-point injection |
| Aspiration / Turbine: | Turbo / Intercooler (Turbocharging / Intercooler) | ||
| Position of cylinders: | Inline | Inline | Inline |
| Valvetrain: | DOHC | SOHC | DOHC |
| Number of cylinders: | 6 | 4 | 4 |
| Number of valves per cylinder: | 4 | 2 | 4 |
| Compression ratio: | 11 | 19.5 | 10.5 |
| Piston Stroke: | 78.8 mm | 95.5 mm | 88.2 mm |
| Cylinder Bore: | 82 mm | 79.5 mm | 80.5 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 5 | 4 | |
| Number of Gears (manual transmission): | 6 | 5 | |
| Length: | 4091 mm | 4409 mm | 4515 mm |
| Width: | 1781 mm | 1735 mm | 1794 mm |
| Height: | 1299 mm | 1485 mm | 1500 mm |
| Wheelbase: | 2495 mm | 2515 mm | 2703 mm |
| Front track: | 1473 mm | 1513 mm | 1488 mm |
| Rear (Back) track: | 1523 mm | 1494 mm | 1488 mm |
| Ride height(clearance): | 160 mm | ||
| Front overhang: | 871 mm | ||
| Rear overhang: | 941 mm | ||
| Minimum volume of Luggage (trunk): | 460 l | 540 l | |
| Maximum amount of Luggage (trunk): | 260 l | 1470 l | 1590 l |
| Front suspension: | Independent, Spring McPherson, with stabilizer | Independent, Spring McPherson, with stabilizer | The depreciated rack |
| Rear suspension: | Helical spring | Semi-independent, spring | The depreciated rack |
| Max weight: | 1570 kg | 1900 kg | 1850 kg |
| Front brakes: | Disc | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc | Disc |
| Kerb Weight: | 1275 kg | 1434 kg | 1325 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | ||
| Tire size: | 225/50 R16 | 195/65 R15 | 195/65 R15 |
| Wheel rims size: | R16 | 6J x 15 | 6.5J X 15 |