Car comparison

BMW 3 Series Convertible (E46) · Facelift 2003 325CivsAlfa Romeo Spider (939) 2.4 JTDM

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

New comparison

BMW 3 Series Convertible (E46) · Facelift 2003

325Ci

192 hp2494 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2003-2006
VS

Alfa Romeo Spider (939)

2.4 JTDM

210 hp2387 ccDieselFWDManualTurbochargedCabriolet / convertible2008-2010

Comparison overview

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

Best choices

Alfa Romeo Spider (939) 2.4 JTDM

  • Most powerful
    210 hp
    157 kW
  • Highest torque
    400 Nm
    295 lb-ft
  • Lightest
    1,635 kg
    3,605 lb
  • Best power-to-weight
    128 hp/t
    96 kW/t
    7.8 kg/hp
  • Lowest combined fuel consumption
    6.8 L/100 km
    34.6 mpg US
    41.5 mpg UK
  • Lowest city consumption
    9.2 L/100 km
    25.6 mpg US
    30.7 mpg UK
  • Lowest highway consumption
    5.4 L/100 km
    43.6 mpg US
    52.3 mpg UK
  • Lowest CO2 emissions
    179 g/km
  • Best estimated range
    1,029 km
    640 mi
  • Best performance score
    50/100
  • Best economy score
    89/100

Specification comparison

Specification comparison
ModelBMW3 Series Convertible (E46)Facelift 2003325CiAlfa RomeoSpider (939)2.4 JTDM
Power
192hp143kW
210hp157kW
Torque
245Nm181lb-ft
400Nm295lb-ft
Curb weight
1,640kg3,616lb
1,635kg3,605lb
Gross weight
1,985kg4,376lb
1,985kg4,376lb
Top speed
234 km/h
145 mph
231 km/h
144 mph
To 99% top speed
109.3s99% target: 232 km/h / 144 mph
Calculated
110.9s99% target: 229 km/h / 142 mph
Calculated
0-100 km/h
8.0s
8.1s
0-200 km/h
37.2s
Calculated
39.3s
Calculated
0-60 mph
7.6s
Calculated
7.6s
Calculated
Fuel consumption
9.6L/100 km24.5mpg US29.4mpg UK
6.8L/100 km34.6mpg US41.5mpg UK
Fuel consumption city
13.4L/100 km17.6mpg US21.1mpg UK
9.2L/100 km25.6mpg US30.7mpg UK
Fuel consumption highway
7.3L/100 km32.2mpg US38.7mpg UK
5.4L/100 km43.6mpg US52.3mpg UK
Quarter mile
15.8s
Calculated
15.9s
Calculated
Power-to-weight
117hp/t87kW/t53hp/1000 lb
Calculated
128hp/t96kW/t58hp/1000 lb
Calculated
Torque-to-weight
149Nm/t100lb-ft/ton
Calculated
245Nm/t164lb-ft/ton
Calculated
Estimated range
656km408mi
Calculated
1,029km640mi
Calculated
Displacement
2,494cc152cu in
2,387cc146cu in
Length
4,488mm177in
4,393mm173in
Width
1,757mm69in
1,830mm72in
Height
1,372mm54in
1,318mm52in
Wheelbase
2,725mm107in
2,528mm100in
Front track
1,471mm58in
1,579mm62in
Rear track
1,483mm58in
1,559mm61in
Trunk volume
260L
253L
Max trunk volume
300L
-
Doors
2
2
Seats
4
2
Fuel tank
63L
70L
CO2 emissions
229g/km
179g/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 3 Series Convertible (E46) Facelift 2003 325CiAlfa Romeo Spider (939) 2.4 JTDMPowerTorque
  • BMW 3 Series Convertible (E46) Facelift 2003 325Ci: Power / Torque
  • Alfa Romeo Spider (939) 2.4 JTDM: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW3 Series Convertible (E46)Facelift 2003325Ci6,000 rpm3,500 rpm6,250 rpm
Alfa RomeoSpider (939)2.4 JTDM4,000 rpm1,500 rpm4,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW3 Series Convertible (E46)Facelift 2003325CiAlfa RomeoSpider (939)2.4 JTDM
Acceleration checkpoints
0-60 mph
0-97 km/h
7.6 s
7.6 s
0-100 km/h
0-62 mph
8.0 s
8.1 s
0-200 km/h
0-124 mph
37.2 s
39.3 s
Top speed
234 km/h
145 mph
231 km/h
144 mph
Drag race simulation
60 ft
18 m
2.5 s
2.5 s
330 ft
101 m
6.8 s
6.8 s
1/8 mile
201 m
10.3 s
10.3 s
1000 ft
305 m
13.3 s
13.3 s
1/4 mile
402 m
15.8 s
15.9 s
Trap speed
1/4 mile
402 m
145 km/h
90 mph
144 km/h
89 mph

Power comparison

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

Chart data table
VehicleValue
BMW3 Series Convertible (E46)Facelift 2003325Ci
192 hp
143 kW
Alfa RomeoSpider (939)2.4 JTDM
210 hp
157 kW

Alfa Romeo Spider (939) 2.4 JTDM has 18 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) 2.4 JTDM: 18 hp (13 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW3 Series Convertible (E46)Facelift 2003325Ci
245 Nm
181 lb-ft
Alfa RomeoSpider (939)2.4 JTDM
400 Nm
295 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW3 Series Convertible (E46)Facelift 2003325Ci
1,640 kg
3,616 lb
Alfa RomeoSpider (939)2.4 JTDM
1,635 kg
3,605 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMW3 Series Convertible (E46)Facelift 2003325Ci
234 km/h
145 mph
Alfa RomeoSpider (939)2.4 JTDM
231 km/h
144 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMW3 Series Convertible (E46)Facelift 2003325Ci8.0 s
Alfa RomeoSpider (939)2.4 JTDM8.1 s

Although Alfa Romeo Spider (939) 2.4 JTDM has more power, BMW 3 Series Convertible (E46) Facelift 2003 325Ci is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW 3 Series Convertible (E46) Facelift 2003 325Ci and Alfa Romeo Spider (939) 2.4 JTDM: 0.1 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMW3 Series Convertible (E46)Facelift 2003325Ci
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
Alfa RomeoSpider (939)2.4 JTDM
6.8 L/100 km
34.6 mpg US
41.5 mpg UK

The biggest fuel consumption difference is between Alfa Romeo Spider (939) 2.4 JTDM and BMW 3 Series Convertible (E46) Facelift 2003 325Ci: 2.8 L/100 km.

Power-to-weight comparison

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

Chart data table
VehicleValue
BMW3 Series Convertible (E46)Facelift 2003325Ci
117 hp/t
87 kW/t
8.5 kg/hp
Alfa RomeoSpider (939)2.4 JTDM
128 hp/t
96 kW/t
7.8 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW3 Series Convertible (E46)Facelift 2003325Ci
656 km
408 mi
Alfa RomeoSpider (939)2.4 JTDM
1,029 km
640 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW3 Series Convertible (E46)Facelift 2003325Ci
192 hp
143 kW
8.0 s
234 km/h
145 mph
Alfa RomeoSpider (939)2.4 JTDM
210 hp
157 kW
8.1 s
231 km/h
144 mph

Most attractive quadrant

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

Chart data table
VehiclePerformance scorePracticality score
BMW3 Series Convertible (E46)Facelift 2003325Ci
Power
192 hp
143 kW
0-100 km/h8.0 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
Alfa RomeoSpider (939)2.4 JTDM
Power
210 hp
157 kW
0-100 km/h8.1 s
Top speed
231 km/h
144 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.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
BMW3 Series Convertible (E46)Facelift 2003325Ci
Power
192 hp
143 kW
0-100 km/h8.0 s
Top speed
234 km/h
145 mph
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
Alfa RomeoSpider (939)2.4 JTDM
Power
210 hp
157 kW
0-100 km/h8.1 s
Top speed
231 km/h
144 mph
6.8 L/100 km
34.6 mpg US
41.5 mpg UK

Alfa Romeo Spider (939) 2.4 JTDM 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
VehicleFuel consumption, L/100 km0-100 km/h, s
BMW3 Series Convertible (E46)Facelift 2003325Ci
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
8.0 s
Alfa RomeoSpider (939)2.4 JTDM
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
8.1 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
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
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
Alfa RomeoSpider (939)2.4 JTDM
128 hp/t
96 kW/t
7.8 kg/hp
6.8 L/100 km
34.6 mpg US
41.5 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW3 Series Convertible (E46)Facelift 2003325CiAlfa RomeoSpider (939)2.4 JTDM
Power
192 hp
143 kW
210 hp
157 kW
Torque
245 Nm
181 lb-ft
400 Nm
295 lb-ft
Acceleration
8.0 s
8.1 s
Top speed
234 km/h
145 mph
231 km/h
144 mph
Lightness
1,640 kg
3,616 lb
1,635 kg
3,605 lb
Fuel consumption
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
Practicality
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
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
656 km
408 mi
1,029 km
640 mi
CO2 score
229 g/km
179 g/km
Trunk score
260 L
9.2 cu ft
253 L
8.9 cu ft
Power-to-weight score
117 hp/t
87 kW/t
8.5 kg/hp
128 hp/t
96 kW/t
7.8 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

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

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
VehicleBMW 3 Series Convertible (E46) Facelift 2003 325CiAlfa Romeo Spider (939) 2.4 JTDM
Consumption9.6 L/100 km24.5 mpg US29.4 mpg UK6.8 L/100 km34.6 mpg US41.5 mpg UK
Cost / 100 km16.80 LC100 km11.90 LC100 km
Cost / 100 mi27.04 LC100 mi19.15 LC100 mi
Annual fuel used1,440 L380 US gal317 UK gal1,020 L269 US gal224 UK gal
Annual fuel cost2,520 LC/year1,785 LC/year

Head-to-head comparisons

BMW 3 Series Convertible (E46) Facelift 2003 325Ci

  • Is 0.1 s quicker from 0-100 km/h
  • Has 3 km/h (2 mph) higher top speed
  • Has 7 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Largest trunk

Cons

  • Lowest power
  • Highest combined fuel consumption
  • Heaviest
  • Highest CO2 emissions

Alfa Romeo Spider (939) 2.4 JTDM

  • Has 18 hp more
  • Has 155 Nm more
  • Is 5 kg lighter
  • Uses 2.8 L/100 km less fuel
  • Has 11 hp/t better power-to-weight
  • Has 373 km (232 mi) more estimated range
  • Emits 50 g/km less CO2

Pros

  • Most powerful
  • Highest torque
  • Lightest
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Best estimated range

Cons

  • Slowest 0-100 km/h
  • Lowest top speed
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 3 Series Convertible (E46) 325Ci
Alfa Romeo Spider (939) 2.4 JTDM
Compare selected cars
2 vehicles selected

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