Comparison Opel Signum (facelift 2005) 2.8i V6 24V Turbo (230 Hp) & Opel Astra G Cabrio 1.8 Ecotec 16V (125 Hp) & Opel Astra F (facelift 1994) GSi 2.0 16V (150 Hp)
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| Brand: | Opel | Opel | Opel |
| Model: | Signum | Astra | Astra |
| Generation: | Signum (facelift 2005) | Astra G Cabrio | Astra F (facelift 1994) |
| Engine / modification: | 2.8i V6 24V Turbo (230 Hp) | 1.8 Ecotec 16V (125 Hp) | GSi 2.0 16V (150 Hp) |
| Production start: | 2005 year | 2000 year | 1994 year |
| Production end: | 2006 year | 2005 year | 1996 year |
| Coupe type: | Hatchback | Cabriolet | Hatchback |
| Num. of Doors: | 5 | 2 | 3 |
| Num. of seats: | 5 | 4 | 5 |
| Fuel consumption / economy - urban: | 15.7 l/100 km | 10.8 l/100 km | 12.7 l/100 km |
| Fuel consumption / economy - extra urban: | 7.6 l/100 km | 5.9 l/100 km | 7.6 l/100 km |
| Fuel consumption / economy - combined: | 7.7 l/100 km | 10.4 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | 0.30 | 0.32 |
| Fuel tank volume: | 60 l | 52 l | 52 l |
| Emission standard: | Euro 3 | ||
| CO2 emissions: | 184 g/km | ||
| Power: | 230 hp | 125 hp | 150 hp |
| Max power in: | 5500 rpm. | 5600 rpm. | 6000 rpm. |
| Maximum speed: | 243 km/h | 207 km/h | 220 km/h |
| Acceleration from 0 to 100 km/h: | 7.6 sec | 10.5 sec | 8.5 sec |
| Torque: | 330 Nm | 170 Nm @ 3800 rpm. | 196 Nm @ 4600 rpm. |
| Model Engine: | Z18XE | C20XE | |
| Engine position: | Front, transverse | Front, transverse | Front, transverse |
| Engine displacement: | 2792 cm3 | 1796 cm3 | 1998 cm3 |
| Engine oil capacity: | 4.25 l | ||
| Coolant: | 6.3 l | ||
| Fuel System: | Multi-point injection | Multi-point injection | Multi-point injection |
| Aspiration / Turbine: | Turbocharging | ||
| Position of cylinders: | V engine | Inline | Inline |
| Valvetrain: | DOHC | DOHC | |
| Number of cylinders: | 6 | 4 | 4 |
| Number of valves per cylinder: | 4 | 4 | 4 |
| Compression ratio: | 9.5 | 10.5 | 10.5 |
| Piston Stroke: | 74.8 mm | 88.2 mm | 86 mm |
| Cylinder Bore: | 89 mm | 80.5 mm | 86 mm |
| Wheel Drive: | Front wheel drive | All wheel drive (4x4) | Front wheel drive |
| Number of Gears (automatic transmission): | - | ||
| Number of Gears (manual transmission): | 6 | 5 | 5 |
| Length: | 4651 mm | 4267 mm | 4051 mm |
| Width: | 1798 mm | 1709 mm | 1696 mm |
| Width including mirrors: | 1989 mm | 1852 mm | |
| Height: | 1466 mm | 1390 mm | 1410 mm |
| Wheelbase: | 2830 mm | 2606 mm | 2517 mm |
| Front track: | 1536 mm | 1474 mm | 1430 mm |
| Rear (Back) track: | 1525 mm | 1462 mm | 1432 mm |
| Ride height(clearance): | 130 mm | ||
| Front overhang: | 812 mm | ||
| Rear overhang: | 849 mm | ||
| Minimum volume of Luggage (trunk): | 365 l | 330 l | 360 l |
| Maximum amount of Luggage (trunk): | 1410 l | 1100 l | 1200 l |
| Front suspension: | Independent, spring | Independent, Spring McPherson, with stabilizer | Independent type McPherson |
| Rear suspension: | Independent, spring | Helical spring | Suspension with traction connecting levers |
| Max weight: | 2175 kg | 1725 kg | 1615 kg |
| Front brakes: | Disc | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Disc | Disc |
| Kerb Weight: | 1580 kg | 1305 kg | 1100 kg |
| ABS: | yes | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | ||
| Minimum turning circle (turning diameter): | 11 m | 10.5 m | |
| Tire size: | 225/50 R17 | 205/50 R16 | 195/55 R15 |
| Wheel rims size: | R17 | 6.5J x 16 | 6J x 15 |