Car comparison

Alfa Romeo 8C Spider 4.7 V8vsMercedes-Benz SL (R230) · Facelift 2006 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) · Facelift 2006

AMG SL 55 V8

517 hp5439 ccGasolineRWDAutomaticSuperchargedRoadster2006-2008

Comparison overview

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

Best choices

Mercedes-Benz SL (R230) Facelift 2006 AMG SL 55 V8

  • Most powerful
    517 hp
    386 kW
  • Highest torque
    720 Nm
    531 lb-ft
  • Best power-to-weight
    274 hp/t
    205 kW/t
    3.6 kg/hp
  • Lowest combined fuel consumption
    13.5 L/100 km
    17.4 mpg US
    20.9 mpg UK
  • Best estimated range
    593 km
    368 mi
  • Best overall score
    67/100
  • Best performance score
    85/100
  • Best economy score
    71/100

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 practicality score
    32/100

Specification comparison

Specification comparison
ModelAlfa Romeo8C Spider4.7 V8Mercedes-BenzSL (R230)Facelift 2006AMG SL 55 V8
Power
450hp336kW
517hp386kW
Torque
480Nm354lb-ft
720Nm531lb-ft
Curb weight
1,675kg3,693lb
1,885kg4,156lb
Gross weight
1,855kg4,090lb
2,205kg4,861lb
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
51.4s99% target: 267 km/h / 166 mph
Calculated
0-100 km/h
4.4s
4.5s
0-200 km/h
13.5s
Calculated
14.0s
0-60 mph
4.2s
Calculated
4.3s
Calculated
Fuel consumption
15.8L/100 km14.9mpg US17.9mpg UK
13.5L/100 km17.4mpg US20.9mpg UK
Fuel consumption city-
20.3L/100 km11.6mpg US13.9mpg UK
Fuel consumption highway-
9.6L/100 km24.5mpg US29.4mpg UK
Quarter mile
12.3s
Calculated
12.5s
Calculated
Power-to-weight
269hp/t200kW/t122hp/1000 lb
Calculated
274hp/t205kW/t124hp/1000 lb
Calculated
Torque-to-weight
287Nm/t192lb-ft/ton
Calculated
382Nm/t256lb-ft/ton
Calculated
Estimated range
557km346mi
Calculated
593km368mi
Calculated
Displacement
4,691cc286cu in
5,439cc332cu in
Length
4,381mm172in
4,532mm178in
Width
1,892mm74in
1,827mm72in
Height
1,366mm54in
1,298mm51in
Wheelbase
2,645mm104in
2,560mm101in
Front track
1,590mm63in
1,559mm61in
Rear track
1,589mm63in
1,537mm61in
Ground clearance
140mm6in
-
Trunk volume-
235L
Max trunk volume-
339L
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) Facelift 2006 AMG SL 55 V8PowerTorque
  • Alfa Romeo 8C Spider 4.7 V8: Power / Torque
  • Mercedes-Benz SL (R230) Facelift 2006 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)Facelift 2006AMG SL 55 V86,100 rpm2,600-4,000 rpm6,350 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricAlfa Romeo8C Spider4.7 V8Mercedes-BenzSL (R230)Facelift 2006AMG SL 55 V8
Acceleration checkpoints
0-60 mph
0-97 km/h
4.2 s
4.3 s
0-100 km/h
0-62 mph
4.4 s
4.5 s
0-200 km/h
0-124 mph
13.5 s
14.0 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
5.5 s
1/8 mile
201 m
8.1 s
8.2 s
1000 ft
305 m
10.4 s
10.5 s
1/4 mile
402 m
12.3 s
12.5 s
Trap speed
1/4 mile
402 m
192 km/h
119 mph
189 km/h
118 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)Facelift 2006AMG SL 55 V8
517 hp
386 kW

Mercedes-Benz SL (R230) Facelift 2006 AMG SL 55 V8 has 67 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) Facelift 2006 AMG SL 55 V8: 67 hp (50 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)Facelift 2006AMG SL 55 V8
720 Nm
531 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)Facelift 2006AMG SL 55 V8
1,885 kg
4,156 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)Facelift 2006AMG 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)Facelift 2006AMG SL 55 V84.5 s

Although Mercedes-Benz SL (R230) Facelift 2006 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) Facelift 2006 AMG SL 55 V8: 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
Alfa Romeo8C Spider4.7 V8
15.8 L/100 km
14.9 mpg US
17.9 mpg UK
Mercedes-BenzSL (R230)Facelift 2006AMG SL 55 V8
13.5 L/100 km
17.4 mpg US
20.9 mpg UK

The biggest fuel consumption difference is between Mercedes-Benz SL (R230) Facelift 2006 AMG SL 55 V8 and Alfa Romeo 8C Spider 4.7 V8: 2.3 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)Facelift 2006AMG SL 55 V8
274 hp/t
205 kW/t
3.6 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)Facelift 2006AMG SL 55 V8
593 km
368 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)Facelift 2006AMG SL 55 V8
517 hp
386 kW
4.5 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)Facelift 2006AMG SL 55 V8
Power
517 hp
386 kW
0-100 km/h4.5 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
4,532 mm
178.4 in
Height
1,298 mm
51.1 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)Facelift 2006AMG SL 55 V8
Power
517 hp
386 kW
0-100 km/h4.5 s
Top speed
Unrestricted
270 km/h168 mph
Restricted
250 km/h155 mph
13.5 L/100 km
17.4 mpg US
20.9 mpg UK

Mercedes-Benz SL (R230) Facelift 2006 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)Facelift 2006AMG SL 55 V8
13.5 L/100 km
17.4 mpg US
20.9 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
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)Facelift 2006AMG SL 55 V8
274 hp/t
205 kW/t
3.6 kg/hp
13.5 L/100 km
17.4 mpg US
20.9 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleAlfa Romeo8C Spider4.7 V8Mercedes-BenzSL (R230)Facelift 2006AMG SL 55 V8
Power
450 hp
336 kW
517 hp
386 kW
Torque
480 Nm
354 lb-ft
720 Nm
531 lb-ft
Acceleration
4.4 s
4.5 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
1,885 kg
4,156 lb
Fuel consumption
15.8 L/100 km
14.9 mpg US
17.9 mpg UK
13.5 L/100 km
17.4 mpg US
20.9 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
4,532 mm
178.4 in
Height
1,298 mm
51.1 in
Range score
557 km
346 mi
593 km
368 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
274 hp/t
205 kW/t
3.6 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) Facelift 2006 AMG SL 55 V8
Consumption15.8 L/100 km14.9 mpg US17.9 mpg UK13.5 L/100 km17.4 mpg US20.9 mpg UK
Cost / 100 km27.65 LC100 km23.63 LC100 km
Cost / 100 mi44.50 LC100 mi38.02 LC100 mi
Annual fuel used2,370 L626 US gal521 UK gal2,025 L535 US gal445 UK gal
Annual fuel cost4,148 LC/year3,544 LC/year

Head-to-head comparisons

Alfa Romeo 8C Spider 4.7 V8

  • Is 210 kg lighter
  • Is 0.1 s quicker from 0-100 km/h
  • Has 30 km/h (19 mph) higher top speed

Pros

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

Cons

  • Lowest power
  • Highest combined fuel consumption

Mercedes-Benz SL (R230) Facelift 2006 AMG SL 55 V8

  • Has 67 hp more
  • Has 240 Nm more
  • Uses 2.3 L/100 km less fuel
  • Has 6 hp/t better power-to-weight
  • Has 36 km (22 mi) more estimated range

Pros

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