Car comparison

BMW 4 Series Convertible (F33) · Facelift 2017 430ivsAlfa Romeo 4C Spider 1.7

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

BMW 4 Series Convertible (F33) · Facelift 2017

430i

252 hp1998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2017-2020

Alfa Romeo 4C Spider

1.7

240 hp1742 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2015-2019

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

BMW 4 Series Convertible (F33) Facelift 2017 430i

Fastest top speed
260 km/h
162 mph Unrestricted
250 km/h
155 mph Restricted
Most powerful
252 hp
188 kW
Highest torque
350 Nm
258 lb-ft
Lowest combined fuel consumption
6.3 L/100 km
37.3 mpg US
44.8 mpg UK
Lowest city consumption
7.9 L/100 km
29.8 mpg US
35.8 mpg UK
Lowest CO2 emissions
146 g/km
Best estimated range
952 km
592 mi
Largest trunk
370 L
Best overall score
55/100
Best economy score
90/100
Best practicality score
47/100

Alfa Romeo 4C Spider 1.7

Quickest 0-100 km/h
4.5 s
Lightest
940 kg
2,072 lb
Best power-to-weight
255 hp/t
190 kW/t
3.9 kg/hp
Lowest highway consumption
5.1 L/100 km
46.1 mpg US
55.4 mpg UK
Best performance score
67/100

Specification comparison

Specification comparison
Model	BMW4 Series Convertible (F33)Facelift 2017430i	Alfa Romeo4C Spider1.7
Power	252hp188kW	240hp179kW
Torque	350Nm258lb-ft	350Nm258lb-ft
Curb weight	1,735kg3,825lb	940kg2,072lb
Gross weight	2,195kg4,839lb	-
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated	257 km/h 160 mph
To 99% top speed	93.0s99% target: 257 km/h / 160 mph Calculated	52.2s99% target: 254 km/h / 158 mph Calculated
0-100 km/h	6.3s	4.5s
0-200 km/h	23.7s Calculated	15.3s Calculated
0-60 mph	6.0s Calculated	4.3s Calculated
Fuel consumption	6.3L/100 km37.3mpg US44.8mpg UK	6.9L/100 km34.1mpg US40.9mpg UK
Fuel consumption city	7.9L/100 km29.8mpg US35.8mpg UK	10.1L/100 km23.3mpg US28.0mpg UK
Fuel consumption highway	5.3L/100 km44.4mpg US53.3mpg UK	5.1L/100 km46.1mpg US55.4mpg UK
Quarter mile	14.4s Calculated	12.6s Calculated
Power-to-weight	145hp/t108kW/t66hp/1000 lb Calculated	255hp/t190kW/t116hp/1000 lb Calculated
Torque-to-weight	202Nm/t135lb-ft/ton Calculated	372Nm/t249lb-ft/ton Calculated
Estimated range	952km592mi Calculated	580km360mi Calculated
Displacement	1,998cc122cu in	1,742cc106cu in
Length	4,640mm183in	3,989mm157in
Width	1,825mm72in	1,864mm73in
Height	1,384mm54in	1,183mm47in
Wheelbase	2,810mm111in	2,380mm94in
Front track	1,544mm61in	1,639mm65in
Rear track	1,593mm63in	1,604mm63in
Ground clearance	130mm5in	113mm4in
Trunk volume	370L	110L
Doors	2	2
Seats	4	2
Fuel tank	60L	40L
CO2 emissions	146g/km	161g/km

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

BMW 4 Series Convertible (F33) Facelift 2017 430iAlfa Romeo 4C Spider 1.7PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW4 Series Convertible (F33)Facelift 2017430i	5,200 rpm	1,450-4,800 rpm	5,450 rpm
Alfa Romeo4C Spider1.7	6,000 rpm	2,200-4,250 rpm	6,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW4 Series Convertible (F33)Facelift 2017430i	Alfa Romeo4C Spider1.7
	Acceleration checkpoints
0-60 mph 0-97 km/h	6.0 s	4.3 s
0-100 km/h 0-62 mph	6.3 s	4.5 s
0-200 km/h 0-124 mph	23.7 s	15.3 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Likely limited	257 km/h 160 mph
	Drag race simulation
60 ft 18 m	2.3 s	2.1 s
330 ft 101 m	6.2 s	5.5 s
1/8 mile 201 m	9.4 s	8.2 s
1000 ft 305 m	12.1 s	10.6 s
1/4 mile 402 m	14.4 s	12.6 s
Trap speed 1/4 mile 402 m	161 km/h 100 mph	184 km/h 114 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017430i	252 hp 188 kW
Alfa Romeo4C Spider1.7	240 hp 179 kW

BMW 4 Series Convertible (F33) Facelift 2017 430i has 12 hp more than Alfa Romeo 4C Spider 1.7.

The biggest power difference is between Alfa Romeo 4C Spider 1.7 and BMW 4 Series Convertible (F33) Facelift 2017 430i: 12 hp (9 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017430i	350 Nm 258 lb-ft
Alfa Romeo4C Spider1.7	350 Nm 258 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017430i	1,735 kg 3,825 lb
Alfa Romeo4C Spider1.7	940 kg 2,072 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017430i	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
Alfa Romeo4C Spider1.7	257 km/h 160 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017430i	6.3 s
Alfa Romeo4C Spider1.7	4.5 s

Although BMW 4 Series Convertible (F33) Facelift 2017 430i has more power, Alfa Romeo 4C Spider 1.7 is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between Alfa Romeo 4C Spider 1.7 and BMW 4 Series Convertible (F33) Facelift 2017 430i: 1.8 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017430i	6.3 L/100 km 37.3 mpg US 44.8 mpg UK
Alfa Romeo4C Spider1.7	6.9 L/100 km 34.1 mpg US 40.9 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (F33) Facelift 2017 430i and Alfa Romeo 4C Spider 1.7: 0.6 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017430i	145 hp/t 108 kW/t 6.9 kg/hp
Alfa Romeo4C Spider1.7	255 hp/t 190 kW/t 3.9 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017430i	952 km 592 mi
Alfa Romeo4C Spider1.7	580 km 360 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMW4 Series Convertible (F33)Facelift 2017430i	252 hp 188 kW	6.3 s	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
Alfa Romeo4C Spider1.7	240 hp 179 kW	4.5 s	257 km/h 160 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Vehicle

Performance score

Practicality score

BMW4 Series Convertible (F33)Facelift 2017430i

Power	252 hp 188 kW
0-100 km/h	6.3 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

Doors/seats	2 doors 4 seats
Trunk	370 L 13.1 cu ft
Length	4,640 mm 182.7 in
Height	1,384 mm 54.5 in

Alfa Romeo4C Spider1.7

Power	240 hp 179 kW
0-100 km/h	4.5 s
Top speed 257 km/h 160 mph

Doors/seats	2 doors 2 seats
Trunk	110 L 3.9 cu ft
Length	3,989 mm 157.0 in
Height	1,183 mm 46.6 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Vehicle

Performance score

Fuel economy score

BMW4 Series Convertible (F33)Facelift 2017430i

Power	252 hp 188 kW
0-100 km/h	6.3 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

6.3 L/100 km

37.3 mpg US

44.8 mpg UK

Alfa Romeo4C Spider1.7

Power	240 hp 179 kW
0-100 km/h	4.5 s
Top speed 257 km/h 160 mph

6.9 L/100 km

34.1 mpg US

40.9 mpg UK

Alfa Romeo 4C Spider 1.7 is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
Vehicle	Fuel consumption, L/100 km	0-100 km/h, s
BMW4 Series Convertible (F33)Facelift 2017430i	6.3 L/100 km 37.3 mpg US 44.8 mpg UK	6.3 s
Alfa Romeo4C Spider1.7	6.9 L/100 km 34.1 mpg US 40.9 mpg UK	4.5 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
Vehicle	Power-to-weight, hp/t	Fuel consumption, L/100 km
BMW4 Series Convertible (F33)Facelift 2017430i	145 hp/t 108 kW/t 6.9 kg/hp	6.3 L/100 km 37.3 mpg US 44.8 mpg UK
Alfa Romeo4C Spider1.7	255 hp/t 190 kW/t 3.9 kg/hp	6.9 L/100 km 34.1 mpg US 40.9 mpg UK

Detailed score breakdown

Vehicle

BMW4 Series Convertible (F33)Facelift 2017430i

Alfa Romeo4C Spider1.7

Power

252 hp

188 kW

240 hp

179 kW

Torque

350 Nm

258 lb-ft

350 Nm

258 lb-ft

Acceleration

6.3 s

4.5 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

257 km/h

160 mph

Lightness

1,735 kg

3,825 lb

940 kg

2,072 lb

Fuel consumption

6.3 L/100 km

37.3 mpg US

44.8 mpg UK

6.9 L/100 km

34.1 mpg US

40.9 mpg UK

Practicality

Doors/seats	2 doors 4 seats
Trunk	370 L 13.1 cu ft
Length	4,640 mm 182.7 in
Height	1,384 mm 54.5 in

Doors/seats	2 doors 2 seats
Trunk	110 L 3.9 cu ft
Length	3,989 mm 157.0 in
Height	1,183 mm 46.6 in

Range score

952 km

592 mi

580 km

360 mi

CO2 score

146 g/km

161 g/km

Trunk score

370 L

13.1 cu ft

110 L

3.9 cu ft

Power-to-weight score

145 hp/t

108 kW/t

6.9 kg/hp

255 hp/t

190 kW/t

3.9 kg/hp

Overall

Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Average annual distanceDistance unitFuel price in your local currencyPrice unit

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
Vehicle	BMW 4 Series Convertible (F33) Facelift 2017 430i	Alfa Romeo 4C Spider 1.7
Consumption	6.3 L/100 km37.3 mpg US44.8 mpg UK	6.9 L/100 km34.1 mpg US40.9 mpg UK
Cost / 100 km	11.03 LC100 km	12.08 LC100 km
Cost / 100 mi	17.74 LC100 mi	19.43 LC100 mi
Annual fuel used	945 L250 US gal208 UK gal	1,035 L273 US gal228 UK gal
Annual fuel cost	1,654 LC/year	1,811 LC/year