The Comparative Analysis :

BMW 428i Convertible xDrive Steptronic (14 - 15) vs. ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17)

€ 52,900
BMW 428i Convertible xDrive Steptronic (14 - 15) BMW 428i Cabrio
€ 75,900
 ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17) ALPINA B4 Bi-Turbo Cabrio
€ 52,900
Base Price ⓘBase price of a new vehicle with standard equipment in Germany at market launch.
€ 75,900

ⓘ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 428i Cabrio is 0.1 inches shorter and 0.7 inches taller.
BMW 428i Cabrio
ALPINA B4 Bi-Turbo Cabrio
55.1
Blueprint BMW 428i Convertible xDrive Steptronic (14 - 15)
71.9
79.4
54.3
Blueprint ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17)
71.9
79.7
71.9 in
Width
71.9 in
79.4 in
Width Incl. Mirrors
79.7 in
55.1 in
Height
54.3 in
Blueprint BMW 428i Convertible xDrive Steptronic (14 - 15)
110.6
182.6
Blueprint ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17)
110.6
182.7
182.6 in
Length
182.7 in
110.6 in
Wheelbase
110.6 in

Vehicle Weight

BMW 428i Cabrio
ALPINA B4 Bi-Turbo Cabrio
4068 lb
Curb Weight
4222 lb
4894 lb
Gross Vehicle
Weight
5071 lb
BMW 428i Convertible xDrive Steptronic (14 - 15)
Weight Difference:
154 lb
3.65 %
ALPINA B4 Bi-Turbo Convertible Switch-Tronic (14 - 17)

General

BMW 428i Cabrio
ALPINA B4 Bi-Turbo Cabrio
F33
Generation
F33
Convertible
Car Body Style
Convertible
Premium Unleaded
Fuel Type
Premium Unleaded
Permanent all-wheel drive (AWD)
Drivetrain
Rear-wheel drive
8-speed automatic transmission
Transmission
8-speed automatic transmission

Engine

BMW 428i Cabrio
ALPINA B4 Bi-Turbo Cabrio
Straight-four gasoline engine with tur­bo­charger
Engine Type
Straight-six gasoline engine with two tur­bo­chargers (bi­turbo)
BMW N20
Engine Series
N20-B20
Engine Code
N55-R20
4
Valves
4
4
Cylinders
6
2 L / 98 cu in
Displacement
3 L / 147 cu in
242 hp
at 5000 rpm
Power
404 hp
at 5500 rpm
BMW 428i Cabrio
242 hp
404 hp
ALPINA B4 Bi-Turbo Cabrio
258 lb‑ft
at 1250 rpm
Max. Torque
443 lb‑ft
at 3000 rpm
BMW 428i Cabrio
258 lb‑ft
443 lb‑ft
ALPINA B4 Bi-Turbo Cabrio

Performance

BMW 428i Cabrio
ALPINA B4 Bi-Turbo Cabrio
155 mph
Maximum Speed
187 mph
6.5 sec
Acceleration 0 to 62 mph
4.5 sec
62 mph 62
mph

295 ft
0.000 sec

BMW 428i Cabrio

62 mph 62
mph

207 ft
0.000 sec

ALPINA B4 Bi-Turbo Cabrio

▶ REPLAY
16.81 lb/hp
Weight-to-Power Ratio
10.45 lb/hp
BMW 428i Cabrio
16.81 lb/hp
10.45 lb/hp
ALPINA B4 Bi-Turbo Cabrio

Fuel Economy / Emissions

BMW 428i Cabrio
ALPINA B4 Bi-Turbo Cabrio
Fuel Economy
34 mpg
combined
29 mpg
BMW 428i Cabrio
34 mpg
29 mpg
ALPINA B4 Bi-Turbo Cabrio
26 mpg
city
22 mpg
No data
highway
No data
Kraftstoffanzeige
15.9 gal
Fuel Tank Capacity
15.9 gal
Kraftstoffanzeige
533 mi
Range
466 mi
BMW 428i Cabrio
533 mi
466 mi
ALPINA B4 Bi-Turbo Cabrio
Environmental Impact
132.6 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).
151.6 kWh
BMW 428i Cabrio
132.6 kWh
151.6 kWh
ALPINA B4 Bi-Turbo Cabrio
Euro 6b (NEFZ)
Emission Standard
Euro 6b (NEFZ)
262 g/mi (NEFZ)
CO2 Emissions
299 g/mi (NEFZ)

Practical Convenience

BMW 428i Cabrio
ALPINA B4 Bi-Turbo Cabrio
2
Doors
2
4
No. of Seats
4
827 lb
Maximum Payload
849 lb
10.5 cu ft
Trunk Volume
10.5 cu ft
No data
Cargo Volume (Seats Down)
No data