The Comparative Analysis :

ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17) vs. BMW 420i Convertible Steptronic (14 - 16)

€ 75,900
ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17) ALPINA B4 Bi-Turbo Cabrio
€ 46,100
 BMW 420i Convertible Steptronic (14 - 16) BMW 420i Cabrio
€ 75,900
Base Price ⓘBase price of a new vehicle with standard equipment in Germany at market launch.
€ 46,100

ⓘ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 ALPINA B4 Bi-Turbo Cabrio is 0.1 inches longer and 0.2 inches lower.
ALPINA B4 Bi-Turbo Cabrio
BMW 420i Cabrio
54.3
Blueprint ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17)
71.9
79.7
54.5
Blueprint BMW 420i Convertible Steptronic (14 - 16)
71.9
79.4
71.9 in
Width
71.9 in
79.7 in
Width Incl. Mirrors
79.4 in
54.3 in
Height
54.5 in
Blueprint ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17)
110.6
182.7
Blueprint BMW 420i Convertible Steptronic (14 - 16)
110.6
182.6
182.7 in
Length
182.6 in
110.6 in
Wheelbase
110.6 in

Vehicle Weight

ALPINA B4 Bi-Turbo Cabrio
BMW 420i Cabrio
4222 lb
Curb Weight
3858 lb
5071 lb
Gross Vehicle
Weight
4729 lb
ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17)
Weight Difference:
364 lb
8.62 %
BMW 420i Convertible Steptronic (14 - 16)

General

ALPINA B4 Bi-Turbo Cabrio
BMW 420i 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

ALPINA B4 Bi-Turbo Cabrio
BMW 420i Cabrio
Straight-six gasoline engine with two tur­bo­chargers (bi­turbo)
Engine Type
Straight-four gasoline engine with tur­bo­charger
Engine Series
BMW N20
N55-R20
Engine Code
N20-B20
4
Valves
4
6
Cylinders
4
3 L / 147 cu in
Displacement
2 L / 98 cu in
404 hp
at 5500 rpm
Power
181 hp
at 5000 rpm
ALPINA B4 Bi-Turbo Cabrio
404 hp
181 hp
BMW 420i Cabrio
443 lb‑ft
at 3000 rpm
Max. Torque
199 lb‑ft
at 1250 rpm
ALPINA B4 Bi-Turbo Cabrio
443 lb‑ft
199 lb‑ft
BMW 420i Cabrio

Performance

ALPINA B4 Bi-Turbo Cabrio
BMW 420i Cabrio
187 mph
Maximum Speed
143 mph
4.5 sec
Acceleration 0 to 62 mph
8.3 sec
62 mph 62
mph

207 ft
0.000 sec

ALPINA B4 Bi-Turbo Cabrio

62 mph 62
mph

377 ft
0.000 sec

BMW 420i Cabrio

▶ REPLAY
10.45 lb/hp
Weight-to-Power Ratio
21.31 lb/hp
ALPINA B4 Bi-Turbo Cabrio
10.45 lb/hp
21.31 lb/hp
BMW 420i Cabrio

Fuel Economy / Emissions

ALPINA B4 Bi-Turbo Cabrio
BMW 420i Cabrio
Fuel Economy
29 mpg
combined
37 mpg
ALPINA B4 Bi-Turbo Cabrio
29 mpg
37 mpg
BMW 420i Cabrio
22 mpg
city
27 mpg
No data
highway
No data
Kraftstoffanzeige
15.9 gal
Fuel Tank Capacity
15.9 gal
Kraftstoffanzeige
466 mi
Range
583 mi
ALPINA B4 Bi-Turbo Cabrio
466 mi
583 mi
BMW 420i Cabrio
Environmental Impact
151.6 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).
121.2 kWh
ALPINA B4 Bi-Turbo Cabrio
151.6 kWh
121.2 kWh
BMW 420i Cabrio
Euro 6b (NEFZ)
Emission Standard
Euro 6b (NEFZ)
299 g/mi (NEFZ)
CO2 Emissions
240 g/mi (NEFZ)

Practical Convenience

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