Car comparison

BMW 1 Series Convertible (E88) 135ivsAlfa Romeo Spider (939) 3.2 JTS V6

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

New comparison

BMW 1 Series Convertible (E88)

135i

306 hp2979 ccGasolineRWDAutomaticTwin-turboCabriolet / convertible2008-2010

Alfa Romeo Spider (939)

3.2 JTS V6

260 hp3195 ccGasolineFWDManualNaturally aspiratedCabriolet / convertible2008-2010

Comparison overview

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

BMW 1 Series Convertible (E88) 135i

Quickest 0-100 km/h
5.7 s
Fastest top speed
260 km/h
162 mph Unrestricted
250 km/h
155 mph Restricted
Most powerful
306 hp
228 kW
Highest torque
400 Nm
295 lb-ft
Best power-to-weight
190 hp/t
142 kW/t
5.3 kg/hp
Lowest combined fuel consumption
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
Lowest city consumption
13.5 L/100 km
17.4 mpg US
20.9 mpg UK
Lowest highway consumption
7.0 L/100 km
33.6 mpg US
40.4 mpg UK
Largest trunk
260 L
Best overall score
58/100
Best performance score
65/100
Best economy score
82/100
Best practicality score
43/100

Alfa Romeo Spider (939) 3.2 JTS V6

Lightest
1,600 kg
3,527 lb
Best estimated range
631 km
392 mi

Specification comparison

Specification comparison
Model	BMW1 Series Convertible (E88)135i	Alfa RomeoSpider (939)3.2 JTS V6
Power	306hp228kW	260hp194kW
Torque	400Nm295lb-ft	322Nm237lb-ft
Curb weight	1,610kg3,549lb	1,600kg3,527lb
Gross weight	2,050kg4,519lb	1,950kg4,299lb
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated	250 km/h 155 mph
To 99% top speed	80.5s99% target: 257 km/h / 160 mph Calculated	104.9s99% target: 248 km/h / 154 mph Calculated
0-100 km/h	5.7s	7.2s
0-200 km/h	20.9s Calculated	29.2s Calculated
0-60 mph	5.4s Calculated	6.8s Calculated
Fuel consumption	9.4L/100 km25mpg US30.1mpg UK	11.1L/100 km21.2mpg US25.4mpg UK
Fuel consumption city	13.5L/100 km17.4mpg US20.9mpg UK	16.5L/100 km14.3mpg US17.1mpg UK
Fuel consumption highway	7L/100 km33.6mpg US40.4mpg UK	7.9L/100 km29.8mpg US35.8mpg UK
Quarter mile	13.8s Calculated	15.1s Calculated
Power-to-weight	190hp/t142kW/t86hp/1000 lb Calculated	163hp/t121kW/t74hp/1000 lb Calculated
Torque-to-weight	248Nm/t166lb-ft/ton Calculated	201Nm/t135lb-ft/ton Calculated
Estimated range	564km350mi Calculated	631km392mi Calculated
Displacement	2,979cc182cu in	3,195cc195cu in
Length	4,360mm172in	4,393mm173in
Width	1,748mm69in	1,830mm72in
Height	1,411mm56in	1,318mm52in
Wheelbase	2,660mm105in	2,528mm100in
Front track	1,474mm58in	1,579mm62in
Rear track	1,507mm59in	1,559mm61in
Ground clearance	140mm6in	-
Trunk volume	260L	253L
Max trunk volume	305L	-
Doors	2	2
Seats	4	2
Fuel tank	53L	70L
CO2 emissions	-	262g/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 1 Series Convertible (E88) 135iAlfa Romeo Spider (939) 3.2 JTS V6PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW1 Series Convertible (E88)135i	5,800 rpm	1,300-5,000 rpm	6,050 rpm
Alfa RomeoSpider (939)3.2 JTS V6	6,300 rpm	4,500 rpm	6,550 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW1 Series Convertible (E88)135i	Alfa RomeoSpider (939)3.2 JTS V6
	Acceleration checkpoints
0-60 mph 0-97 km/h	5.4 s	6.8 s
0-100 km/h 0-62 mph	5.7 s	7.2 s
0-200 km/h 0-124 mph	20.9 s	29.2 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Limited	250 km/h 155 mph
	Drag race simulation
60 ft 18 m	2.3 s	2.4 s
330 ft 101 m	6.0 s	6.5 s
1/8 mile 201 m	9.0 s	9.9 s
1000 ft 305 m	11.6 s	12.7 s
1/4 mile 402 m	13.8 s	15.1 s
Trap speed 1/4 mile 402 m	167 km/h 104 mph	152 km/h 95 mph

Power comparison

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

Chart data table
Vehicle	Value
BMW1 Series Convertible (E88)135i	306 hp 228 kW
Alfa RomeoSpider (939)3.2 JTS V6	260 hp 194 kW

BMW 1 Series Convertible (E88) 135i has 46 hp more than Alfa Romeo Spider (939) 3.2 JTS V6.

The biggest power difference is between Alfa Romeo Spider (939) 3.2 JTS V6 and BMW 1 Series Convertible (E88) 135i: 46 hp (34 kW).

Torque comparison

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

Chart data table
Vehicle	Value
BMW1 Series Convertible (E88)135i	400 Nm 295 lb-ft
Alfa RomeoSpider (939)3.2 JTS V6	322 Nm 237 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
BMW1 Series Convertible (E88)135i	1,610 kg 3,549 lb
Alfa RomeoSpider (939)3.2 JTS V6	1,600 kg 3,527 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
BMW1 Series Convertible (E88)135i	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
Alfa RomeoSpider (939)3.2 JTS V6	250 km/h 155 mph

0-100 km/h comparison

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

Chart data table
Vehicle	Value
BMW1 Series Convertible (E88)135i	5.7 s
Alfa RomeoSpider (939)3.2 JTS V6	7.2 s

The biggest 0-100 km/h difference is between BMW 1 Series Convertible (E88) 135i and Alfa Romeo Spider (939) 3.2 JTS V6: 1.5 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
BMW1 Series Convertible (E88)135i	9.4 L/100 km 25.0 mpg US 30.1 mpg UK
Alfa RomeoSpider (939)3.2 JTS V6	11.1 L/100 km 21.2 mpg US 25.4 mpg UK

The biggest fuel consumption difference is between BMW 1 Series Convertible (E88) 135i and Alfa Romeo Spider (939) 3.2 JTS V6: 1.7 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
BMW1 Series Convertible (E88)135i	190 hp/t 142 kW/t 5.3 kg/hp
Alfa RomeoSpider (939)3.2 JTS V6	163 hp/t 121 kW/t 6.2 kg/hp

Estimated range comparison

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

Chart data table
Vehicle	Value
BMW1 Series Convertible (E88)135i	564 km 350 mi
Alfa RomeoSpider (939)3.2 JTS V6	631 km 392 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMW1 Series Convertible (E88)135i	306 hp 228 kW	5.7 s	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
Alfa RomeoSpider (939)3.2 JTS V6	260 hp 194 kW	7.2 s	250 km/h 155 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

BMW1 Series Convertible (E88)135i

Power	306 hp 228 kW
0-100 km/h	5.7 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

Doors/seats	2 doors 4 seats
Trunk	260 L 9.2 cu ft
Length	4,360 mm 171.7 in
Height	1,411 mm 55.6 in

Alfa RomeoSpider (939)3.2 JTS V6

Power	260 hp 194 kW
0-100 km/h	7.2 s
Top speed 250 km/h 155 mph

Doors/seats	2 doors 2 seats
Trunk	253 L 8.9 cu ft
Length	4,393 mm 173.0 in
Height	1,318 mm 51.9 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

BMW1 Series Convertible (E88)135i

Power	306 hp 228 kW
0-100 km/h	5.7 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

9.4 L/100 km

25.0 mpg US

30.1 mpg UK

Alfa RomeoSpider (939)3.2 JTS V6

Power	260 hp 194 kW
0-100 km/h	7.2 s
Top speed 250 km/h 155 mph

11.1 L/100 km

21.2 mpg US

25.4 mpg UK

BMW 1 Series Convertible (E88) 135i 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
BMW1 Series Convertible (E88)135i	9.4 L/100 km 25.0 mpg US 30.1 mpg UK	5.7 s
Alfa RomeoSpider (939)3.2 JTS V6	11.1 L/100 km 21.2 mpg US 25.4 mpg UK	7.2 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
BMW1 Series Convertible (E88)135i	190 hp/t 142 kW/t 5.3 kg/hp	9.4 L/100 km 25.0 mpg US 30.1 mpg UK
Alfa RomeoSpider (939)3.2 JTS V6	163 hp/t 121 kW/t 6.2 kg/hp	11.1 L/100 km 21.2 mpg US 25.4 mpg UK

Detailed score breakdown

Vehicle

BMW1 Series Convertible (E88)135i

Alfa RomeoSpider (939)3.2 JTS V6

Power

306 hp

228 kW

260 hp

194 kW

Torque

400 Nm

295 lb-ft

322 Nm

237 lb-ft

Acceleration

5.7 s

7.2 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

250 km/h

155 mph

Lightness

1,610 kg

3,549 lb

1,600 kg

3,527 lb

Fuel consumption

9.4 L/100 km

25.0 mpg US

30.1 mpg UK

11.1 L/100 km

21.2 mpg US

25.4 mpg UK

Practicality

Doors/seats	2 doors 4 seats
Trunk	260 L 9.2 cu ft
Length	4,360 mm 171.7 in
Height	1,411 mm 55.6 in

Doors/seats	2 doors 2 seats
Trunk	253 L 8.9 cu ft
Length	4,393 mm 173.0 in
Height	1,318 mm 51.9 in

Range score

564 km

350 mi

631 km

392 mi

CO2 score

262 g/km

Trunk score

260 L

9.2 cu ft

253 L

8.9 cu ft

Power-to-weight score

190 hp/t

142 kW/t

5.3 kg/hp

163 hp/t

121 kW/t

6.2 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 1 Series Convertible (E88) 135i	Alfa Romeo Spider (939) 3.2 JTS V6
Consumption	9.4 L/100 km25 mpg US30.1 mpg UK	11.1 L/100 km21.2 mpg US25.4 mpg UK
Cost / 100 km	16.45 LC100 km	19.43 LC100 km
Cost / 100 mi	26.47 LC100 mi	31.26 LC100 mi
Annual fuel used	1,410 L372 US gal310 UK gal	1,665 L440 US gal366 UK gal
Annual fuel cost	2,468 LC/year	2,914 LC/year