Comparison Alpina B4 Coupe (facelift 2017) S Edition 99 3.0 (452 Hp) AWD Switch-Tronic & Acura RDX III (facelift 2021) 2.0 (272 Hp) Automatic
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| Brand: | Alpina | Acura |
| Model: | B4 | RDX |
| Generation: | B4 Coupe (facelift 2017) | RDX III (facelift 2021) |
| Engine / modification: | S Edition 99 3.0 (452 Hp) AWD Switch-Tronic | 2.0 (272 Hp) Automatic |
| Production start: | 2018 year | 2021 year |
| Coupe type: | Coupe | SUV |
| Num. of Doors: | 2 | 5 |
| Num. of seats: | 4 | 5 |
| Fuel consumption / economy - urban: | 12.3 l/100 km | 10.7 l/100 km |
| Fuel consumption / economy - extra urban: | 7.4 l/100 km | 8.4 l/100 km |
| Fuel consumption / economy - combined: | 9.2 l/100 km | 9.8 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Fuel tank volume: | 60 l | 65 l |
| Emission standard: | Euro 6 d-TEMP | ULEV-50 |
| CO2 emissions: | 209 g/km | |
| Power: | 452 hp | 272 hp |
| Max power in: | 5500-6250 rpm. | 6500 rpm. |
| Maximum speed: | 303 km/h | |
| Acceleration from 0 to 100 km/h: | 3.9 sec | |
| Torque: | 680 Nm @ 3000-4500 rpm. | 380 Nm @ 1600-4500 rpm. |
| Model Engine: | K20C4 | |
| Engine position: | Front, longitudinal | |
| Engine displacement: | 2979 cm3 | 1996 cm3 |
| Engine oil capacity: | 4.8 l | |
| Coolant: | 5.5 l | |
| Fuel System: | Direct injection | Direct injection |
| Aspiration / Turbine: | BiTurbo | |
| Position of cylinders: | Inline | Inline |
| Valvetrain: | DOHC, VTEC | |
| Number of cylinders: | 6 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10.2 | 9.8 |
| Piston Stroke: | 89.6 mm | 85.9 mm |
| Cylinder Bore: | 84 mm | 86 mm |
| Wheel Drive: | All wheel drive (4x4) | Front wheel drive |
| Number of Gears (automatic transmission): | 8 Switch-Tronic | 10 |
| Length: | 4640 mm | 4760 mm |
| Width: | 1825 mm | 1900 mm |
| Height: | 1373 mm | 1669 mm |
| Wheelbase: | 2810 mm | 2751 mm |
| Front track: | 1551 mm | 1631 mm |
| Rear (Back) track: | 1576 mm | 1643 mm |
| Minimum volume of Luggage (trunk): | 445 l | 835 l |
| Maximum amount of Luggage (trunk): | 2260 l | |
| Max weight: | 2200 kg | |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 1680 kg | 1718 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | |
| Power steering: | Electric Steering | Electric Steering |
| Minimum turning circle (turning diameter): | 11.9 m | |
| Permitted trailer load with brakes (12%): | 1800 kg | 680 kg |
| Permitted trailer load without brakes: | 750 kg | |
| Tire size: | 245/30 ZR20; 265/30 ZR20 | 235/55 R19 |
| Wheel rims size: | 8J x 20; 9J x 20 | 8J x 19 |