Car comparison

Porsche 911 (991 II) GT3 4.0vsPorsche 911 Cabriolet (991) Turbo 3.8

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

New comparison

Porsche 911 (991 II)

GT3 4.0

500 hp3996 ccGasolineRWDManualNaturally aspiratedCoupe2017-2018
VS

Porsche 911 Cabriolet (991)

Turbo 3.8

520 hp3800 ccGasolineAWDDual-clutchTwin-turboCabriolet / convertible2013-2016

Comparison overview

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

Best choices

Porsche 911 Cabriolet (991) Turbo 3.8

  • Quickest 0-100 km/h
    3.5 s
  • Most powerful
    520 hp
    388 kW
  • Highest torque
    660 Nm
    487 lb-ft
  • Lowest combined fuel consumption
    9.9 L/100 km
    23.8 mpg US
    28.5 mpg UK
  • Lowest city consumption
    13.4 L/100 km
    17.6 mpg US
    21.1 mpg UK
  • Lowest highway consumption
    7.8 L/100 km
    30.2 mpg US
    36.2 mpg UK
  • Lowest CO2 emissions
    231 g/km
  • Best estimated range
    687 km
    427 mi
  • Largest trunk
    275 L
  • Best overall score
    76/100
  • Best performance score
    91/100
  • Best economy score
    80/100
  • Best practicality score
    43/100

Porsche 911 (991 II) GT3 4.0

  • Fastest top speed
    330 km/h
    205 mph Unrestricted
    320 km/h
    199 mph Restricted
  • Lightest
    1,413 kg
    3,115 lb
  • Best power-to-weight
    354 hp/t
    264 kW/t
    2.8 kg/hp

Specification comparison

Specification comparison
ModelPorsche911 (991 II)GT3 4.0Porsche911 Cabriolet (991)Turbo 3.8
Power
500hp373kW
520hp388kW
Torque
460Nm339lb-ft
660Nm487lb-ft
Curb weight
1,413kg3,115lb
1,665kg3,671lb
Gross weight
1,760kg3,880lb
2,045kg4,508lb
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Calculated
315 km/h
196 mph
To 99% top speed
69.5s99% target: 327 km/h / 203 mph
Calculated
51.1s99% target: 312 km/h / 194 mph
Calculated
0-100 km/h
3.9s
3.5s
0-200 km/h
11.4s
10.0s
Calculated
0-60 mph
3.7s
Calculated
3.3s
Calculated
Fuel consumption
12.9L/100 km18.2mpg US21.9mpg UK
9.9L/100 km23.8mpg US28.5mpg UK
Fuel consumption city
19.7L/100 km11.9mpg US14.3mpg UK
13.4L/100 km17.6mpg US21.1mpg UK
Fuel consumption highway
8.8L/100 km26.7mpg US32.1mpg UK
7.8L/100 km30.2mpg US36.2mpg UK
Quarter mile
11.7s
Calculated
11.2s
Calculated
Power-to-weight
354hp/t264kW/t161hp/1000 lb
Calculated
312hp/t233kW/t142hp/1000 lb
Calculated
Torque-to-weight
326Nm/t218lb-ft/ton
Calculated
396Nm/t265lb-ft/ton
Calculated
Estimated range
496km308mi
Calculated
687km427mi
Calculated
Displacement
3,996cc244cu in
3,800cc232cu in
Length
4,562mm180in
4,506mm177in
Width
1,852mm73in
1,880mm74in
Height
1,271mm50in
1,292mm51in
Wheelbase
2,457mm97in
2,450mm96in
Front track
1,551mm61in
1,541mm61in
Rear track
1,555mm61in
1,590mm63in
Ground clearance
88mm3in
-
Trunk volume
125L
275L
Doors
2
2
Seats
2
4
Fuel tank
64L
68L
CO2 emissions
290g/km
231g/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 (991 II) GT3 4.0Porsche 911 Cabriolet (991) Turbo 3.8PowerTorque
  • Porsche 911 (991 II) GT3 4.0: Power / Torque
  • Porsche 911 Cabriolet (991) Turbo 3.8: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Porsche911 (991 II)GT3 4.08,250 rpm6,000 rpm9,000 rpm
Porsche911 Cabriolet (991)Turbo 3.86,000-6,500 rpm1,950-5,000 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorsche911 (991 II)GT3 4.0Porsche911 Cabriolet (991)Turbo 3.8
Acceleration checkpoints
0-60 mph
0-97 km/h
3.7 s
3.3 s
0-100 km/h
0-62 mph
3.9 s
3.5 s
0-200 km/h
0-124 mph
11.4 s
10.0 s
0-200 mph
0-322 km/h
54.3 s
-
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Likely limited
315 km/h
196 mph
Drag race simulation
60 ft
18 m
2.0 s
1.9 s
330 ft
101 m
5.2 s
5.0 s
1/8 mile
201 m
7.7 s
7.4 s
1000 ft
305 m
9.9 s
9.4 s
1/4 mile
402 m
11.7 s
11.2 s
Trap speed
1/4 mile
402 m
203 km/h
126 mph
212 km/h
132 mph

Power comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 4.0
500 hp
373 kW
Porsche911 Cabriolet (991)Turbo 3.8
520 hp
388 kW

Porsche 911 Cabriolet (991) Turbo 3.8 has 20 hp more than Porsche 911 (991 II) GT3 4.0.

The biggest power difference is between Porsche 911 (991 II) GT3 4.0 and Porsche 911 Cabriolet (991) Turbo 3.8: 20 hp (15 kW).

Torque comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 4.0
460 Nm
339 lb-ft
Porsche911 Cabriolet (991)Turbo 3.8
660 Nm
487 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 4.0
1,413 kg
3,115 lb
Porsche911 Cabriolet (991)Turbo 3.8
1,665 kg
3,671 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 (991 II)GT3 4.0
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Porsche911 Cabriolet (991)Turbo 3.8
315 km/h
196 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 4.03.9 s
Porsche911 Cabriolet (991)Turbo 3.83.5 s

The biggest 0-100 km/h difference is between Porsche 911 Cabriolet (991) Turbo 3.8 and Porsche 911 (991 II) GT3 4.0: 0.4 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 (991 II)GT3 4.0
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
Porsche911 Cabriolet (991)Turbo 3.8
9.9 L/100 km
23.8 mpg US
28.5 mpg UK

The biggest fuel consumption difference is between Porsche 911 Cabriolet (991) Turbo 3.8 and Porsche 911 (991 II) GT3 4.0: 3.0 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 (991 II)GT3 4.0
354 hp/t
264 kW/t
2.8 kg/hp
Porsche911 Cabriolet (991)Turbo 3.8
312 hp/t
233 kW/t
3.2 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 4.0
496 km
308 mi
Porsche911 Cabriolet (991)Turbo 3.8
687 km
427 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
Porsche911 (991 II)GT3 4.0
500 hp
373 kW
3.9 s
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Porsche911 Cabriolet (991)Turbo 3.8
520 hp
388 kW
3.5 s
315 km/h
196 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 (991 II)GT3 4.0
Power
500 hp
373 kW
0-100 km/h3.9 s
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Doors/seats
2 doors
2 seats
Trunk
125 L
4.4 cu ft
Length
4,562 mm
179.6 in
Height
1,271 mm
50.0 in
Porsche911 Cabriolet (991)Turbo 3.8
Power
520 hp
388 kW
0-100 km/h3.5 s
Top speed
315 km/h
196 mph
Doors/seats
2 doors
4 seats
Trunk
275 L
9.7 cu ft
Length
4,506 mm
177.4 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 (991 II)GT3 4.0
Power
500 hp
373 kW
0-100 km/h3.9 s
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
Porsche911 Cabriolet (991)Turbo 3.8
Power
520 hp
388 kW
0-100 km/h3.5 s
Top speed
315 km/h
196 mph
9.9 L/100 km
23.8 mpg US
28.5 mpg UK

Porsche 911 Cabriolet (991) Turbo 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 (991 II)GT3 4.0
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
3.9 s
Porsche911 Cabriolet (991)Turbo 3.8
9.9 L/100 km
23.8 mpg US
28.5 mpg UK
3.5 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
Porsche911 (991 II)GT3 4.0
354 hp/t
264 kW/t
2.8 kg/hp
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
Porsche911 Cabriolet (991)Turbo 3.8
312 hp/t
233 kW/t
3.2 kg/hp
9.9 L/100 km
23.8 mpg US
28.5 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorsche911 (991 II)GT3 4.0Porsche911 Cabriolet (991)Turbo 3.8
Power
500 hp
373 kW
520 hp
388 kW
Torque
460 Nm
339 lb-ft
660 Nm
487 lb-ft
Acceleration
3.9 s
3.5 s
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
315 km/h
196 mph
Lightness
1,413 kg
3,115 lb
1,665 kg
3,671 lb
Fuel consumption
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
9.9 L/100 km
23.8 mpg US
28.5 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
125 L
4.4 cu ft
Length
4,562 mm
179.6 in
Height
1,271 mm
50.0 in
Doors/seats
2 doors
4 seats
Trunk
275 L
9.7 cu ft
Length
4,506 mm
177.4 in
Height
1,292 mm
50.9 in
Range score
496 km
308 mi
687 km
427 mi
CO2 score
290 g/km
231 g/km
Trunk score
125 L
4.4 cu ft
275 L
9.7 cu ft
Power-to-weight score
354 hp/t
264 kW/t
2.8 kg/hp
312 hp/t
233 kW/t
3.2 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 (991 II) GT3 4.0Porsche 911 Cabriolet (991) Turbo 3.8
Consumption12.9 L/100 km18.2 mpg US21.9 mpg UK9.9 L/100 km23.8 mpg US28.5 mpg UK
Cost / 100 km22.58 LC100 km17.33 LC100 km
Cost / 100 mi36.33 LC100 mi27.88 LC100 mi
Annual fuel used1,935 L511 US gal426 UK gal1,485 L392 US gal327 UK gal
Annual fuel cost3,386 LC/year2,599 LC/year

Head-to-head comparisons

Porsche 911 (991 II) GT3 4.0

  • Is 252 kg lighter
  • Has 15 km/h (9 mph) higher top speed
  • Has 42 hp/t better power-to-weight

Pros

  • Highest top speed
  • Lightest
  • Best power-to-weight ratio

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Highest combined fuel consumption
  • Smallest trunk
  • Highest CO2 emissions

Porsche 911 Cabriolet (991) Turbo 3.8

  • Has 20 hp more
  • Has 200 Nm more
  • Is 0.4 s quicker from 0-100 km/h
  • Uses 3.0 L/100 km less fuel
  • Has 191 km (119 mi) more estimated range
  • Has 150 L more trunk volume
  • Emits 59 g/km less CO2

Pros

  • Quickest 0-100 km/h in this comparison
  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche 911 (991 II) GT3 4.0
Porsche 911 Cabriolet (991) Turbo 3.8
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