Car comparison

Alfa Romeo Spider (939) 1.8 TBivsBMW 3 Series Convertible (E46) · Facelift 2003 325Ci

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

New comparison

Alfa Romeo Spider (939)

1.8 TBi

200 hp1742 ccGasolineFWDManualTurbochargedCabriolet / convertible2009-2010

BMW 3 Series Convertible (E46) · Facelift 2003

325Ci

192 hp2494 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2003-2006

Comparison overview

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

Alfa Romeo Spider (939) 1.8 TBi

Quickest 0-100 km/h
7.8 s
Fastest top speed
235 km/h
146 mph
Most powerful
200 hp
149 kW
Highest torque
320 Nm
236 lb-ft
Lightest
1,490 kg
3,285 lb
Best power-to-weight
134 hp/t
100 kW/t
7.5 kg/hp
Lowest combined fuel consumption
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
Lowest city consumption
11.9 L/100 km
19.8 mpg US
23.7 mpg UK
Lowest highway consumption
6.1 L/100 km
38.6 mpg US
46.3 mpg UK
Lowest CO2 emissions
192 g/km
Best estimated range
854 km
530 mi
Best performance score
49/100
Best economy score
85/100

BMW 3 Series Convertible (E46) Facelift 2003 325Ci

Largest trunk
260 L
Best overall score
46/100
Best practicality score
43/100

Specification comparison

Specification comparison
Model	Alfa RomeoSpider (939)1.8 TBi	BMW3 Series Convertible (E46)Facelift 2003325Ci
Power	200hp149kW	192hp143kW
Torque	320Nm236lb-ft	245Nm181lb-ft
Curb weight	1,490kg3,285lb	1,640kg3,616lb
Gross weight	1,840kg4,057lb	1,985kg4,376lb
Top speed	235 km/h 146 mph	234 km/h 145 mph
To 99% top speed	106.9s99% target: 233 km/h / 145 mph Calculated	109.0s99% target: 232 km/h / 144 mph Calculated
0-100 km/h	7.8s	8.0s
0-200 km/h	35.9s Calculated	37.2s Calculated
0-60 mph	7.4s Calculated	7.6s Calculated
Fuel consumption	8.2L/100 km28.7mpg US34.4mpg UK	9.6L/100 km24.5mpg US29.4mpg UK
Fuel consumption city	11.9L/100 km19.8mpg US23.7mpg UK	13.4L/100 km17.6mpg US21.1mpg UK
Fuel consumption highway	6.1L/100 km38.6mpg US46.3mpg UK	7.3L/100 km32.2mpg US38.7mpg UK
Quarter mile	15.6s Calculated	15.8s Calculated
Power-to-weight	134hp/t100kW/t61hp/1000 lb Calculated	117hp/t87kW/t53hp/1000 lb Calculated
Torque-to-weight	215Nm/t144lb-ft/ton Calculated	149Nm/t100lb-ft/ton Calculated
Estimated range	854km530mi Calculated	656km408mi Calculated
Displacement	1,742cc106cu in	2,494cc152cu in
Length	4,393mm173in	4,488mm177in
Width	1,830mm72in	1,757mm69in
Height	1,318mm52in	1,372mm54in
Wheelbase	2,528mm100in	2,725mm107in
Front track	1,579mm62in	1,471mm58in
Rear track	1,559mm61in	1,483mm58in
Trunk volume	253L	260L
Max trunk volume	-	300L
Doors	2	2
Seats	2	4
Fuel tank	70L	63L
CO2 emissions	192g/km	229g/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.

Alfa Romeo Spider (939) 1.8 TBiBMW 3 Series Convertible (E46) Facelift 2003 325CiPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
Alfa RomeoSpider (939)1.8 TBi	5,000 rpm	1,400 rpm	5,250 rpm
BMW3 Series Convertible (E46)Facelift 2003325Ci	6,000 rpm	3,500 rpm	6,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	Alfa RomeoSpider (939)1.8 TBi	BMW3 Series Convertible (E46)Facelift 2003325Ci
	Acceleration checkpoints
0-60 mph 0-97 km/h	7.4 s	7.6 s
0-100 km/h 0-62 mph	7.8 s	8.0 s
0-200 km/h 0-124 mph	35.9 s	37.2 s
Top speed	235 km/h 146 mph	234 km/h 145 mph
	Drag race simulation
60 ft 18 m	2.5 s	2.5 s
330 ft 101 m	6.7 s	6.8 s
1/8 mile 201 m	10.2 s	10.3 s
1000 ft 305 m	13.1 s	13.3 s
1/4 mile 402 m	15.6 s	15.8 s
Trap speed 1/4 mile 402 m	146 km/h 91 mph	145 km/h 90 mph

Power comparison

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

Chart data table
Vehicle	Value
Alfa RomeoSpider (939)1.8 TBi	200 hp 149 kW
BMW3 Series Convertible (E46)Facelift 2003325Ci	192 hp 143 kW

Alfa Romeo Spider (939) 1.8 TBi has 8 hp more than BMW 3 Series Convertible (E46) Facelift 2003 325Ci.

The biggest power difference is between BMW 3 Series Convertible (E46) Facelift 2003 325Ci and Alfa Romeo Spider (939) 1.8 TBi: 8 hp (6 kW).

Torque comparison

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

Chart data table
Vehicle	Value
Alfa RomeoSpider (939)1.8 TBi	320 Nm 236 lb-ft
BMW3 Series Convertible (E46)Facelift 2003325Ci	245 Nm 181 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
Alfa RomeoSpider (939)1.8 TBi	1,490 kg 3,285 lb
BMW3 Series Convertible (E46)Facelift 2003325Ci	1,640 kg 3,616 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
Alfa RomeoSpider (939)1.8 TBi	235 km/h 146 mph
BMW3 Series Convertible (E46)Facelift 2003325Ci	234 km/h 145 mph

0-100 km/h comparison

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

Chart data table
Vehicle	Value
Alfa RomeoSpider (939)1.8 TBi	7.8 s
BMW3 Series Convertible (E46)Facelift 2003325Ci	8.0 s

The biggest 0-100 km/h difference is between Alfa Romeo Spider (939) 1.8 TBi and BMW 3 Series Convertible (E46) Facelift 2003 325Ci: 0.2 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
Alfa RomeoSpider (939)1.8 TBi	8.2 L/100 km 28.7 mpg US 34.4 mpg UK
BMW3 Series Convertible (E46)Facelift 2003325Ci	9.6 L/100 km 24.5 mpg US 29.4 mpg UK

The biggest fuel consumption difference is between Alfa Romeo Spider (939) 1.8 TBi and BMW 3 Series Convertible (E46) Facelift 2003 325Ci: 1.4 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
Alfa RomeoSpider (939)1.8 TBi	134 hp/t 100 kW/t 7.4 kg/hp
BMW3 Series Convertible (E46)Facelift 2003325Ci	117 hp/t 87 kW/t 8.5 kg/hp

Estimated range comparison

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

Chart data table
Vehicle	Value
Alfa RomeoSpider (939)1.8 TBi	854 km 530 mi
BMW3 Series Convertible (E46)Facelift 2003325Ci	656 km 408 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
Alfa RomeoSpider (939)1.8 TBi	200 hp 149 kW	7.8 s	235 km/h 146 mph
BMW3 Series Convertible (E46)Facelift 2003325Ci	192 hp 143 kW	8.0 s	234 km/h 145 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

Alfa RomeoSpider (939)1.8 TBi

Power	200 hp 149 kW
0-100 km/h	7.8 s
Top speed 235 km/h 146 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

BMW3 Series Convertible (E46)Facelift 2003325Ci

Power	192 hp 143 kW
0-100 km/h	8.0 s
Top speed 234 km/h 145 mph

Doors/seats	2 doors 4 seats
Trunk	260 L 9.2 cu ft
Length	4,488 mm 176.7 in
Height	1,372 mm 54.0 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

Alfa RomeoSpider (939)1.8 TBi

Power	200 hp 149 kW
0-100 km/h	7.8 s
Top speed 235 km/h 146 mph

8.2 L/100 km

28.7 mpg US

34.4 mpg UK

BMW3 Series Convertible (E46)Facelift 2003325Ci

Power	192 hp 143 kW
0-100 km/h	8.0 s
Top speed 234 km/h 145 mph

9.6 L/100 km

24.5 mpg US

29.4 mpg UK

Alfa Romeo Spider (939) 1.8 TBi 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
Alfa RomeoSpider (939)1.8 TBi	8.2 L/100 km 28.7 mpg US 34.4 mpg UK	7.8 s
BMW3 Series Convertible (E46)Facelift 2003325Ci	9.6 L/100 km 24.5 mpg US 29.4 mpg UK	8.0 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
Alfa RomeoSpider (939)1.8 TBi	134 hp/t 100 kW/t 7.5 kg/hp	8.2 L/100 km 28.7 mpg US 34.4 mpg UK
BMW3 Series Convertible (E46)Facelift 2003325Ci	117 hp/t 87 kW/t 8.5 kg/hp	9.6 L/100 km 24.5 mpg US 29.4 mpg UK

Detailed score breakdown

Vehicle

Alfa RomeoSpider (939)1.8 TBi

BMW3 Series Convertible (E46)Facelift 2003325Ci

Power

200 hp

149 kW

192 hp

143 kW

Torque

320 Nm

236 lb-ft

245 Nm

181 lb-ft

Acceleration

7.8 s

8.0 s

Top speed

235 km/h

146 mph

234 km/h

145 mph

Lightness

1,490 kg

3,285 lb

1,640 kg

3,616 lb

Fuel consumption

8.2 L/100 km

28.7 mpg US

34.4 mpg UK

9.6 L/100 km

24.5 mpg US

29.4 mpg UK

Practicality

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

Doors/seats	2 doors 4 seats
Trunk	260 L 9.2 cu ft
Length	4,488 mm 176.7 in
Height	1,372 mm 54.0 in

Range score

854 km

530 mi

656 km

408 mi

CO2 score

192 g/km

229 g/km

Trunk score

253 L

8.9 cu ft

260 L

9.2 cu ft

Power-to-weight score

134 hp/t

100 kW/t

7.5 kg/hp

117 hp/t

87 kW/t

8.5 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	Alfa Romeo Spider (939) 1.8 TBi	BMW 3 Series Convertible (E46) Facelift 2003 325Ci
Consumption	8.2 L/100 km28.7 mpg US34.4 mpg UK	9.6 L/100 km24.5 mpg US29.4 mpg UK
Cost / 100 km	14.35 LC100 km	16.80 LC100 km
Cost / 100 mi	23.09 LC100 mi	27.04 LC100 mi
Annual fuel used	1,230 L325 US gal271 UK gal	1,440 L380 US gal317 UK gal
Annual fuel cost	2,153 LC/year	2,520 LC/year