The Comparative Analysis :

BMW 420i Convertible Steptronic (16 - 17) vs. ALPINA B4 S Bi-Turbo Convertible Switch-Tronic (18 - 19)

€ 46,900
BMW 420i Convertible Steptronic (16 - 17) BMW 420i Cabrio
€ 81,400
 ALPINA B4 S Bi-Turbo Convertible Switch-Tronic (18 - 19) ALPINA B4 S Bi-Turbo Cabrio
€ 46,900
Base Price ⓘBase price of a new vehicle with standard equipment in Germany at market launch.
€ 81,400

ⓘBase price of a new vehicle with standard equipment in Germany at market launch. Price Info

Vehicle Dimensions

Тhere is barely any difference in dimensions between the two vehicles. Both cars are the same width, but the BMW 420i Cabrio is 0.1 inches shorter and 0.2 inches taller.
BMW 420i Cabrio
ALPINA B4 S Bi-Turbo Cabrio
54.5
Blueprint BMW 420i Convertible Steptronic (16 - 17)
71.9
79.4
54.3
Blueprint ALPINA B4 S Bi-Turbo Convertible Switch-Tronic (18 - 19)
71.9
79.7
71.9 in
Width
71.9 in
79.4 in
Width Incl. Mirrors
79.7 in
54.5 in
Height
54.3 in
Blueprint BMW 420i Convertible Steptronic (16 - 17)
110.6
182.6
Blueprint ALPINA B4 S Bi-Turbo Convertible Switch-Tronic (18 - 19)
110.6
182.7
182.6 in
Length
182.7 in
110.6 in
Wheelbase
110.6 in

Vehicle Weight

BMW 420i Cabrio
ALPINA B4 S Bi-Turbo Cabrio
3946 lb
Curb Weight
4222 lb
4817 lb
Gross Vehicle
Weight
5071 lb
BMW 420i Convertible Steptronic (16 - 17)
Weight Difference:
276 lb
6.54 %
ALPINA B4 S Bi-Turbo Convertible Switch-Tronic (18 - 19)

General

BMW 420i Cabrio
ALPINA B4 S Bi-Turbo Cabrio
F33
Generation
F33
Convertible
Car Body Style
Convertible
Premium Unleaded
Fuel Type
Premium Unleaded
Rear-wheel drive
Drivetrain
Rear-wheel drive
8-speed automatic transmission
Transmission
8-speed automatic transmission

Engine

BMW 420i Cabrio
ALPINA B4 S Bi-Turbo Cabrio
Straight-four gasoline engine with tur­bo­charger
Engine Type
Straight-six gasoline engine with two tur­bo­chargers (bi­turbo)
BMW B48
Engine Series
B48-B20
Engine Code
N55-B30
4
Valves
4
4
Cylinders
6
2 L / 98 cu in
Displacement
3 L / 147 cu in
181 hp
at 5000 rpm
Power
434 hp
at 5500 rpm
BMW 420i Cabrio
181 hp
434 hp
ALPINA B4 S Bi-Turbo Cabrio
199 lb‑ft
at 1350 rpm
Max. Torque
487 lb‑ft
at 3000 rpm
BMW 420i Cabrio
199 lb‑ft
487 lb‑ft
ALPINA B4 S Bi-Turbo Cabrio

Performance

BMW 420i Cabrio
ALPINA B4 S Bi-Turbo Cabrio
143 mph
Maximum Speed
189 mph
8.4 sec
Acceleration 0 to 62 mph
4.3 sec
62 mph 62
mph

384 ft
0.000 sec

BMW 420i Cabrio

62 mph 62
mph

197 ft
0.000 sec

ALPINA B4 S Bi-Turbo Cabrio

▶ REPLAY
21.8 lb/hp
Weight-to-Power Ratio
9.73 lb/hp
BMW 420i Cabrio
21.8 lb/hp
9.73 lb/hp
ALPINA B4 S Bi-Turbo Cabrio

Fuel Economy / Emissions

BMW 420i Cabrio
ALPINA B4 S Bi-Turbo Cabrio
Fuel Economy
41 mpg
combined
26 mpg
BMW 420i Cabrio
41 mpg
26 mpg
ALPINA B4 S Bi-Turbo Cabrio
31 mpg
city
19 mpg
No data
highway
No data
Kraftstoffanzeige
15.9 gal
Fuel Tank Capacity
15.9 gal
Kraftstoffanzeige
642 mi
Range
409 mi
BMW 420i Cabrio
642 mi
409 mi
ALPINA B4 S Bi-Turbo Cabrio
Environmental Impact
109.9 kWh
Total Energy Consumption
per 100 miles ⓘThe total energy consumption per 100 miles is the amount of energy consumed by a vehicle when burning fuel or using electricity per 100 miles (final energy), and the energy required to produce the appropriate amount of fuel or electricity (primary energy).
172.4 kWh
BMW 420i Cabrio
109.9 kWh
172.4 kWh
ALPINA B4 S Bi-Turbo Cabrio
Euro 6b (NEFZ)
Emission Standard
Euro 6d-TEMP (WLTP)
219 g/mi (NEFZ)
CO2 Emissions
333 g/mi (NEFZ)

Practical Convenience

BMW 420i Cabrio
ALPINA B4 S Bi-Turbo Cabrio
2
Doors
2
4
No. of Seats
4
871 lb
Maximum Payload
849 lb
10.5 cu ft
Trunk Volume
10.5 cu ft
No data
Cargo Volume (Seats Down)
No data