Car comparison

Alfa Romeo 8C Spider 4.7 V8vsMercedes-Benz SL (R230) AMG SL 55 V8

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

New comparison

Alfa Romeo 8C Spider

4.7 V8

450 hp4691 ccGasolineRWDManualNaturally aspiratedRoadster2008-2010
VS

Mercedes-Benz SL (R230)

AMG SL 55 V8

476 hp5439 ccGasolineRWDAutomaticSuperchargedRoadster2001-2006

Comparison overview

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

Best choices

Mercedes-Benz SL (R230) AMG SL 55 V8

  • Most powerful
    476 hp
    355 kW
  • Highest torque
    700 Nm
    516 lb-ft
  • Lowest combined fuel consumption
    14.2 L/100 km
    16.6 mpg US
    19.9 mpg UK
  • Best estimated range
    563 km
    350 mi
  • Best overall score
    66/100
  • Best performance score
    83/100
  • Best economy score
    69/100

Alfa Romeo 8C Spider 4.7 V8

  • Quickest 0-100 km/h
    4.4 s
  • Fastest top speed
    300 km/h
    186 mph Unrestricted
    290 km/h
    180 mph Restricted
  • Lightest
    1,675 kg
    3,693 lb
  • Best power-to-weight
    269 hp/t
    200 kW/t
    3.7 kg/hp
  • Best practicality score
    32/100

Specification comparison

Specification comparison
ModelAlfa Romeo8C Spider4.7 V8Mercedes-BenzSL (R230)AMG SL 55 V8
Power
450hp336kW
476hp355kW
Torque
480Nm354lb-ft
700Nm516lb-ft
Curb weight
1,675kg3,693lb
1,880kg4,145lb
Gross weight
1,855kg4,090lb
2,200kg4,850lb
Top speed
Unrestricted
300 km/h186 mph
Restricted
290 km/h180 mph
Calculated
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
67.0s99% target: 297 km/h / 185 mph
Calculated
59.2s99% target: 267 km/h / 166 mph
Calculated
0-100 km/h
4.4s
4.7s
0-200 km/h
13.5s
Calculated
15.3s
Calculated
0-60 mph
4.2s
Calculated
4.5s
Calculated
Fuel consumption
15.8L/100 km14.9mpg US17.9mpg UK
14.2L/100 km16.6mpg US19.9mpg UK
Fuel consumption city-
20.9L/100 km11.3mpg US13.5mpg UK
Fuel consumption highway-
10.6L/100 km22.2mpg US26.6mpg UK
Quarter mile
12.3s
Calculated
12.7s
Calculated
Power-to-weight
269hp/t200kW/t122hp/1000 lb
Calculated
253hp/t189kW/t115hp/1000 lb
Calculated
Torque-to-weight
287Nm/t192lb-ft/ton
Calculated
372Nm/t249lb-ft/ton
Calculated
Estimated range
557km346mi
Calculated
563km350mi
Calculated
Displacement
4,691cc286cu in
5,439cc332cu in
Length
4,381mm172in
4,535mm179in
Width
1,892mm74in
1,815mm71in
Height
1,366mm54in
1,295mm51in
Wheelbase
2,645mm104in
2,560mm101in
Front track
1,590mm63in
1,569mm62in
Rear track
1,589mm63in
1,551mm61in
Ground clearance
140mm6in
-
Trunk volume-
235L
Max trunk volume-
317L
Doors
2
2
Seats
2
2
Fuel tank
88L
80L
CO2 emissions
377g/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 8C Spider 4.7 V8Mercedes-Benz SL (R230) AMG SL 55 V8PowerTorque
  • Alfa Romeo 8C Spider 4.7 V8: Power / Torque
  • Mercedes-Benz SL (R230) AMG SL 55 V8: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Alfa Romeo8C Spider4.7 V87,000 rpm4,750 rpm7,500 rpm
Mercedes-BenzSL (R230)AMG SL 55 V86,100 rpm2,650-4,500 rpm6,350 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricAlfa Romeo8C Spider4.7 V8Mercedes-BenzSL (R230)AMG SL 55 V8
Acceleration checkpoints
0-60 mph
0-97 km/h
4.2 s
4.5 s
0-100 km/h
0-62 mph
4.4 s
4.7 s
0-200 km/h
0-124 mph
13.5 s
15.3 s
Top speed
Unrestricted
300 km/h186 mph
Restricted
290 km/h180 mph
Likely limited
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Limited
Drag race simulation
60 ft
18 m
2.1 s
2.2 s
330 ft
101 m
5.5 s
5.6 s
1/8 mile
201 m
8.1 s
8.4 s
1000 ft
305 m
10.4 s
10.8 s
1/4 mile
402 m
12.3 s
12.7 s
Trap speed
1/4 mile
402 m
192 km/h
119 mph
184 km/h
114 mph

Power comparison

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

Chart data table
VehicleValue
Alfa Romeo8C Spider4.7 V8
450 hp
336 kW
Mercedes-BenzSL (R230)AMG SL 55 V8
476 hp
355 kW

Mercedes-Benz SL (R230) AMG SL 55 V8 has 26 hp more than Alfa Romeo 8C Spider 4.7 V8.

The biggest power difference is between Alfa Romeo 8C Spider 4.7 V8 and Mercedes-Benz SL (R230) AMG SL 55 V8: 26 hp (19 kW).

Torque comparison

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

Chart data table
VehicleValue
Alfa Romeo8C Spider4.7 V8
480 Nm
354 lb-ft
Mercedes-BenzSL (R230)AMG SL 55 V8
700 Nm
516 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
Alfa Romeo8C Spider4.7 V8
1,675 kg
3,693 lb
Mercedes-BenzSL (R230)AMG SL 55 V8
1,880 kg
4,145 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
Alfa Romeo8C Spider4.7 V8
Unrestricted
300 km/h186 mph
Restricted
290 km/h180 mph
Mercedes-BenzSL (R230)AMG SL 55 V8
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
Alfa Romeo8C Spider4.7 V84.4 s
Mercedes-BenzSL (R230)AMG SL 55 V84.7 s

Although Mercedes-Benz SL (R230) AMG SL 55 V8 has more power, Alfa Romeo 8C Spider 4.7 V8 is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between Alfa Romeo 8C Spider 4.7 V8 and Mercedes-Benz SL (R230) AMG SL 55 V8: 0.3 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
Alfa Romeo8C Spider4.7 V8
15.8 L/100 km
14.9 mpg US
17.9 mpg UK
Mercedes-BenzSL (R230)AMG SL 55 V8
14.2 L/100 km
16.6 mpg US
19.9 mpg UK

The biggest fuel consumption difference is between Mercedes-Benz SL (R230) AMG SL 55 V8 and Alfa Romeo 8C Spider 4.7 V8: 1.6 L/100 km.

Power-to-weight comparison

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

Chart data table
VehicleValue
Alfa Romeo8C Spider4.7 V8
269 hp/t
200 kW/t
3.7 kg/hp
Mercedes-BenzSL (R230)AMG SL 55 V8
253 hp/t
189 kW/t
3.9 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
Alfa Romeo8C Spider4.7 V8
557 km
346 mi
Mercedes-BenzSL (R230)AMG SL 55 V8
563 km
350 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
Alfa Romeo8C Spider4.7 V8
450 hp
336 kW
4.4 s
Unrestricted
300 km/h186 mph
Restricted
290 km/h180 mph
Mercedes-BenzSL (R230)AMG SL 55 V8
476 hp
355 kW
4.7 s
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 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
Alfa Romeo8C Spider4.7 V8
Power
450 hp
336 kW
0-100 km/h4.4 s
Top speed
Unrestricted
300 km/h186 mph
Restricted
290 km/h180 mph
Doors/seats
2 doors
2 seats
Trunk-
Length
4,381 mm
172.5 in
Height
1,366 mm
53.8 in
Mercedes-BenzSL (R230)AMG SL 55 V8
Power
476 hp
355 kW
0-100 km/h4.7 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
235 L
8.3 cu ft
Length
4,535 mm
178.5 in
Height
1,295 mm
51.0 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
Alfa Romeo8C Spider4.7 V8
Power
450 hp
336 kW
0-100 km/h4.4 s
Top speed
Unrestricted
300 km/h186 mph
Restricted
290 km/h180 mph
15.8 L/100 km
14.9 mpg US
17.9 mpg UK
Mercedes-BenzSL (R230)AMG SL 55 V8
Power
476 hp
355 kW
0-100 km/h4.7 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
14.2 L/100 km
16.6 mpg US
19.9 mpg UK

Mercedes-Benz SL (R230) AMG SL 55 V8 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
Alfa Romeo8C Spider4.7 V8
15.8 L/100 km
14.9 mpg US
17.9 mpg UK
4.4 s
Mercedes-BenzSL (R230)AMG SL 55 V8
14.2 L/100 km
16.6 mpg US
19.9 mpg UK
4.7 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
Alfa Romeo8C Spider4.7 V8
269 hp/t
200 kW/t
3.7 kg/hp
15.8 L/100 km
14.9 mpg US
17.9 mpg UK
Mercedes-BenzSL (R230)AMG SL 55 V8
253 hp/t
189 kW/t
3.9 kg/hp
14.2 L/100 km
16.6 mpg US
19.9 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleAlfa Romeo8C Spider4.7 V8Mercedes-BenzSL (R230)AMG SL 55 V8
Power
450 hp
336 kW
476 hp
355 kW
Torque
480 Nm
354 lb-ft
700 Nm
516 lb-ft
Acceleration
4.4 s
4.7 s
Top speed
Unrestricted
300 km/h186 mph
Restricted
290 km/h180 mph
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
Lightness
1,675 kg
3,693 lb
1,880 kg
4,145 lb
Fuel consumption
15.8 L/100 km
14.9 mpg US
17.9 mpg UK
14.2 L/100 km
16.6 mpg US
19.9 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk-
Length
4,381 mm
172.5 in
Height
1,366 mm
53.8 in
Doors/seats
2 doors
2 seats
Trunk
235 L
8.3 cu ft
Length
4,535 mm
178.5 in
Height
1,295 mm
51.0 in
Range score
557 km
346 mi
563 km
350 mi
CO2 score
377 g/km
-
Trunk score
-
235 L
8.3 cu ft
Power-to-weight score
269 hp/t
200 kW/t
3.7 kg/hp
253 hp/t
189 kW/t
3.9 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
VehicleAlfa Romeo 8C Spider 4.7 V8Mercedes-Benz SL (R230) AMG SL 55 V8
Consumption15.8 L/100 km14.9 mpg US17.9 mpg UK14.2 L/100 km16.6 mpg US19.9 mpg UK
Cost / 100 km27.65 LC100 km24.85 LC100 km
Cost / 100 mi44.50 LC100 mi39.99 LC100 mi
Annual fuel used2,370 L626 US gal521 UK gal2,130 L563 US gal469 UK gal
Annual fuel cost4,148 LC/year3,728 LC/year

Head-to-head comparisons

Alfa Romeo 8C Spider 4.7 V8

  • Is 205 kg lighter
  • Is 0.3 s quicker from 0-100 km/h
  • Has 30 km/h (19 mph) higher top speed
  • Has 15 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Lightest
  • Best power-to-weight ratio

Cons

  • Lowest power
  • Highest combined fuel consumption

Mercedes-Benz SL (R230) AMG SL 55 V8

  • Has 26 hp more
  • Has 220 Nm more
  • Uses 1.6 L/100 km less fuel
  • Has 6 km (4 mi) more estimated range

Pros

  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Slowest 0-100 km/h
  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Alfa Romeo 8C Spider 4.7 V8
Mercedes-Benz SL (R230) AMG SL 55 V8
Compare selected cars
2 vehicles selected

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