Car comparison

Porsche 911 (997) · Facelift 2008 GT3 RS 3.8vsPorsche 911 Cabriolet (991) Carrera S 3.8

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

New comparison

Porsche 911 (997) · Facelift 2008

GT3 RS 3.8

450 hp3797 ccGasolineRWDManualNaturally aspiratedCoupe2009-2011
VS

Porsche 911 Cabriolet (991)

Carrera S 3.8

400 hp3800 ccGasolineRWDDual-clutchNaturally aspiratedCabriolet / convertible2011-2015

Comparison overview

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

Best choices

Porsche 911 Cabriolet (991) Carrera S 3.8

  • Highest torque
    440 Nm
    325 lb-ft
  • Lowest combined fuel consumption
    8.9 L/100 km
    26.4 mpg US
    31.7 mpg UK
  • Lowest city consumption
    12.2 L/100 km
    19.3 mpg US
    23.2 mpg UK
  • Lowest highway consumption
    6.9 L/100 km
    34.1 mpg US
    40.9 mpg UK
  • Lowest CO2 emissions
    207 g/km
  • Best estimated range
    719 km
    447 mi
  • Largest trunk
    290 L
  • Best economy score
    83/100
  • Best practicality score
    44/100

Porsche 911 (997) Facelift 2008 GT3 RS 3.8

  • Quickest 0-100 km/h
    4.0 s
  • Fastest top speed
    320 km/h
    199 mph Unrestricted
    310 km/h
    193 mph Restricted
  • Most powerful
    450 hp
    336 kW
  • Lightest
    1,370 kg
    3,020 lb
  • Best power-to-weight
    328 hp/t
    245 kW/t
    3.0 kg/hp
  • Best overall score
    70/100
  • Best performance score
    84/100

Specification comparison

Specification comparison
ModelPorsche911 (997)Facelift 2008GT3 RS 3.8Porsche911 Cabriolet (991)Carrera S 3.8
Power
450hp336kW
400hp298kW
Torque
430Nm317lb-ft
440Nm325lb-ft
Curb weight
1,370kg3,020lb
1,505kg3,318lb
Gross weight
1,680kg3,704lb
1,905kg4,200lb
Top speed
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
Calculated
299 km/h
186 mph
To 99% top speed
58.5s99% target: 317 km/h / 197 mph
Calculated
60.4s99% target: 296 km/h / 184 mph
Calculated
0-100 km/h
4.0s
4.3s
0-200 km/h
11.2s
Calculated
12.8s
Calculated
0-60 mph
3.8s
Calculated
4.1s
Calculated
Fuel consumption
13.2L/100 km17.8mpg US21.4mpg UK
8.9L/100 km26.4mpg US31.7mpg UK
Fuel consumption city
19.4L/100 km12.1mpg US14.6mpg UK
12.2L/100 km19.3mpg US23.2mpg UK
Fuel consumption highway
9.6L/100 km24.5mpg US29.4mpg UK
6.9L/100 km34.1mpg US40.9mpg UK
Quarter mile
11.7s
Calculated
12.2s
Calculated
Power-to-weight
328hp/t245kW/t149hp/1000 lb
Calculated
266hp/t198kW/t121hp/1000 lb
Calculated
Torque-to-weight
314Nm/t210lb-ft/ton
Calculated
292Nm/t196lb-ft/ton
Calculated
Estimated range
508km315mi
Calculated
719km447mi
Calculated
Displacement
3,797cc232cu in
3,800cc232cu in
Length
4,460mm176in
4,491mm177in
Width
1,808mm71in
1,808mm71in
Height
1,280mm50in
1,292mm51in
Wheelbase
2,355mm93in
2,450mm96in
Front track-
1,538mm61in
Rear track-
1,516mm60in
Trunk volume-
290L
Max trunk volume
105L
-
Doors
2
2
Seats
2
4
Fuel tank
67L
64L
CO2 emissions
314g/km
207g/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.

Porsche 911 (997) Facelift 2008 GT3 RS 3.8Porsche 911 Cabriolet (991) Carrera S 3.8PowerTorque
  • Porsche 911 (997) Facelift 2008 GT3 RS 3.8: Power / Torque
  • Porsche 911 Cabriolet (991) Carrera S 3.8: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Porsche911 (997)Facelift 2008GT3 RS 3.87,900 rpm6,750 rpm8,150 rpm
Porsche911 Cabriolet (991)Carrera S 3.87,400 rpm5,600 rpm7,650 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorsche911 (997)Facelift 2008GT3 RS 3.8Porsche911 Cabriolet (991)Carrera S 3.8
Acceleration checkpoints
0-60 mph
0-97 km/h
3.8 s
4.1 s
0-100 km/h
0-62 mph
4.0 s
4.3 s
0-200 km/h
0-124 mph
11.2 s
12.8 s
Top speed
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
Likely limited
299 km/h
186 mph
Drag race simulation
60 ft
18 m
2.1 s
2.1 s
330 ft
101 m
5.3 s
5.4 s
1/8 mile
201 m
7.8 s
8.1 s
1000 ft
305 m
10.0 s
10.3 s
1/4 mile
402 m
11.7 s
12.2 s
Trap speed
1/4 mile
402 m
205 km/h
128 mph
195 km/h
121 mph

Power comparison

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

Chart data table
VehicleValue
Porsche911 (997)Facelift 2008GT3 RS 3.8
450 hp
336 kW
Porsche911 Cabriolet (991)Carrera S 3.8
400 hp
298 kW

Porsche 911 (997) Facelift 2008 GT3 RS 3.8 has 50 hp more than Porsche 911 Cabriolet (991) Carrera S 3.8.

The biggest power difference is between Porsche 911 Cabriolet (991) Carrera S 3.8 and Porsche 911 (997) Facelift 2008 GT3 RS 3.8: 50 hp (37 kW).

Torque comparison

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

Chart data table
VehicleValue
Porsche911 (997)Facelift 2008GT3 RS 3.8
430 Nm
317 lb-ft
Porsche911 Cabriolet (991)Carrera S 3.8
440 Nm
325 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
Porsche911 (997)Facelift 2008GT3 RS 3.8
1,370 kg
3,020 lb
Porsche911 Cabriolet (991)Carrera S 3.8
1,505 kg
3,318 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
Porsche911 (997)Facelift 2008GT3 RS 3.8
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
Porsche911 Cabriolet (991)Carrera S 3.8
299 km/h
186 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
Porsche911 (997)Facelift 2008GT3 RS 3.84.0 s
Porsche911 Cabriolet (991)Carrera S 3.84.3 s

The biggest 0-100 km/h difference is between Porsche 911 (997) Facelift 2008 GT3 RS 3.8 and Porsche 911 Cabriolet (991) Carrera S 3.8: 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
Porsche911 (997)Facelift 2008GT3 RS 3.8
13.2 L/100 km
17.8 mpg US
21.4 mpg UK
Porsche911 Cabriolet (991)Carrera S 3.8
8.9 L/100 km
26.4 mpg US
31.7 mpg UK

The biggest fuel consumption difference is between Porsche 911 Cabriolet (991) Carrera S 3.8 and Porsche 911 (997) Facelift 2008 GT3 RS 3.8: 4.3 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
Porsche911 (997)Facelift 2008GT3 RS 3.8
328 hp/t
245 kW/t
3.0 kg/hp
Porsche911 Cabriolet (991)Carrera S 3.8
266 hp/t
198 kW/t
3.8 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
Porsche911 (997)Facelift 2008GT3 RS 3.8
508 km
315 mi
Porsche911 Cabriolet (991)Carrera S 3.8
719 km
447 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
Porsche911 (997)Facelift 2008GT3 RS 3.8
450 hp
336 kW
4.0 s
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
Porsche911 Cabriolet (991)Carrera S 3.8
400 hp
298 kW
4.3 s
299 km/h
186 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
Porsche911 (997)Facelift 2008GT3 RS 3.8
Power
450 hp
336 kW
0-100 km/h4.0 s
Top speed
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
Doors/seats
2 doors
2 seats
Trunk
105 L
3.7 cu ft
Length
4,460 mm
175.6 in
Height
1,280 mm
50.4 in
Porsche911 Cabriolet (991)Carrera S 3.8
Power
400 hp
298 kW
0-100 km/h4.3 s
Top speed
299 km/h
186 mph
Doors/seats
2 doors
4 seats
Trunk
290 L
10.2 cu ft
Length
4,491 mm
176.8 in
Height
1,292 mm
50.9 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
Porsche911 (997)Facelift 2008GT3 RS 3.8
Power
450 hp
336 kW
0-100 km/h4.0 s
Top speed
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
13.2 L/100 km
17.8 mpg US
21.4 mpg UK
Porsche911 Cabriolet (991)Carrera S 3.8
Power
400 hp
298 kW
0-100 km/h4.3 s
Top speed
299 km/h
186 mph
8.9 L/100 km
26.4 mpg US
31.7 mpg UK

Porsche 911 Cabriolet (991) Carrera S 3.8 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
Porsche911 (997)Facelift 2008GT3 RS 3.8
13.2 L/100 km
17.8 mpg US
21.4 mpg UK
4.0 s
Porsche911 Cabriolet (991)Carrera S 3.8
8.9 L/100 km
26.4 mpg US
31.7 mpg UK
4.3 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
Porsche911 (997)Facelift 2008GT3 RS 3.8
328 hp/t
245 kW/t
3.0 kg/hp
13.2 L/100 km
17.8 mpg US
21.4 mpg UK
Porsche911 Cabriolet (991)Carrera S 3.8
266 hp/t
198 kW/t
3.8 kg/hp
8.9 L/100 km
26.4 mpg US
31.7 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorsche911 (997)Facelift 2008GT3 RS 3.8Porsche911 Cabriolet (991)Carrera S 3.8
Power
450 hp
336 kW
400 hp
298 kW
Torque
430 Nm
317 lb-ft
440 Nm
325 lb-ft
Acceleration
4.0 s
4.3 s
Top speed
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
299 km/h
186 mph
Lightness
1,370 kg
3,020 lb
1,505 kg
3,318 lb
Fuel consumption
13.2 L/100 km
17.8 mpg US
21.4 mpg UK
8.9 L/100 km
26.4 mpg US
31.7 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
105 L
3.7 cu ft
Length
4,460 mm
175.6 in
Height
1,280 mm
50.4 in
Doors/seats
2 doors
4 seats
Trunk
290 L
10.2 cu ft
Length
4,491 mm
176.8 in
Height
1,292 mm
50.9 in
Range score
508 km
315 mi
719 km
447 mi
CO2 score
314 g/km
207 g/km
Trunk score
105 L
3.7 cu ft
290 L
10.2 cu ft
Power-to-weight score
328 hp/t
245 kW/t
3.0 kg/hp
266 hp/t
198 kW/t
3.8 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
VehiclePorsche 911 (997) Facelift 2008 GT3 RS 3.8Porsche 911 Cabriolet (991) Carrera S 3.8
Consumption13.2 L/100 km17.8 mpg US21.4 mpg UK8.9 L/100 km26.4 mpg US31.7 mpg UK
Cost / 100 km23.10 LC100 km15.58 LC100 km
Cost / 100 mi37.18 LC100 mi25.07 LC100 mi
Annual fuel used1,980 L523 US gal436 UK gal1,335 L353 US gal294 UK gal
Annual fuel cost3,465 LC/year2,336 LC/year

Head-to-head comparisons

Porsche 911 (997) Facelift 2008 GT3 RS 3.8

  • Has 50 hp more
  • Is 135 kg lighter
  • Is 0.3 s quicker from 0-100 km/h
  • Has 21 km/h (13 mph) higher top speed
  • Has 63 hp/t better power-to-weight

Pros

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

Cons

  • Highest combined fuel consumption
  • Smallest trunk
  • Highest CO2 emissions

Porsche 911 Cabriolet (991) Carrera S 3.8

  • Has 10 Nm more
  • Uses 4.3 L/100 km less fuel
  • Has 212 km (131 mi) more estimated range
  • Has 185 L more trunk volume
  • Emits 107 g/km less CO2

Pros

  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

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

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche 911 (997) GT3 RS 3.8
Porsche 911 Cabriolet (991) Carrera S 3.8
Compare selected cars
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