Car comparison

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

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

New comparison

Porsche 911 (991 II)

Turbo 3.8

540 hp3800 ccGasolineAWDDual-clutchTwin-turboCoupe2015-2018
VS

Porsche 911 (991)

GT3 RS 4.0

500 hp3996 ccGasolineRWDDual-clutchNaturally aspiratedCoupe2015-2017

Comparison overview

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

Best choices

Porsche 911 (991 II) Turbo 3.8

  • Quickest 0-100 km/h
    3.0 s
  • Fastest top speed
    330 km/h
    205 mph Unrestricted
    320 km/h
    199 mph Restricted
  • Most powerful
    540 hp
    403 kW
  • Highest torque
    710 Nm
    524 lb-ft
  • Lowest combined fuel consumption
    9.1 L/100 km
    25.8 mpg US
    31.0 mpg UK
  • Lowest city consumption
    11.8 L/100 km
    19.9 mpg US
    23.9 mpg UK
  • Lowest highway consumption
    7.5 L/100 km
    31.4 mpg US
    37.7 mpg UK
  • Lowest CO2 emissions
    212 g/km
  • Best estimated range
    747 km
    464 mi
  • Best overall score
    77/100
  • Best performance score
    94/100
  • Best economy score
    82/100
  • Best practicality score
    40/100

Specification comparison

Specification comparison
ModelPorsche911 (991 II)Turbo 3.8Porsche911 (991)GT3 RS 4.0
Power
540hp403kW
500hp373kW
Torque
710Nm524lb-ft
460Nm339lb-ft
Curb weight
1,595kg3,516lb
1,420kg3,131lb
Gross weight
2,010kg4,431lb
1,720kg3,792lb
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Calculated
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
Calculated
To 99% top speed
45.8s99% target: 327 km/h / 203 mph
Calculated
47.9s99% target: 317 km/h / 197 mph
Calculated
0-100 km/h
3.0s
3.3s
0-200 km/h
8.3s
Calculated
9.2s
Calculated
0-60 mph
2.9s
Calculated
3.2s
Calculated
Fuel consumption
9.1L/100 km25.8mpg US31.0mpg UK
12.7L/100 km18.5mpg US22.2mpg UK
Fuel consumption city
11.8L/100 km19.9mpg US23.9mpg UK
19.2L/100 km12.3mpg US14.7mpg UK
Fuel consumption highway
7.5L/100 km31.4mpg US37.7mpg UK
8.9L/100 km26.4mpg US31.7mpg UK
Quarter mile
10.4s
Calculated
10.9s
Calculated
Power-to-weight
339hp/t252kW/t154hp/1000 lb
Calculated
352hp/t263kW/t160hp/1000 lb
Calculated
Torque-to-weight
445Nm/t298lb-ft/ton
Calculated
324Nm/t217lb-ft/ton
Calculated
Estimated range
747km464mi
Calculated
504km313mi
Calculated
Displacement
3,800cc232cu in
3,996cc244cu in
Length
4,507mm177in
4,545mm179in
Width
1,880mm74in
1,880mm74in
Height
1,297mm51in
1,291mm51in
Wheelbase
2,450mm96in
2,457mm97in
Front track
1,541mm61in
1,587mm62in
Rear track
1,590mm63in
1,557mm61in
Trunk volume
115L
125L
Max trunk volume
260L
260L
Doors
2
2
Seats
4
2
Fuel tank
68L
64L
CO2 emissions
212g/km
296g/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) Turbo 3.8Porsche 911 (991) GT3 RS 4.0PowerTorque
  • Porsche 911 (991 II) Turbo 3.8: Power / Torque
  • Porsche 911 (991) GT3 RS 4.0: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Porsche911 (991 II)Turbo 3.86,400 rpm2,250-4,000 rpm6,650 rpm
Porsche911 (991)GT3 RS 4.08,250 rpm6,250 rpm8,500 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorsche911 (991 II)Turbo 3.8Porsche911 (991)GT3 RS 4.0
Acceleration checkpoints
0-60 mph
0-97 km/h
2.9 s
3.2 s
0-100 km/h
0-62 mph
3.0 s
3.3 s
0-200 km/h
0-124 mph
8.3 s
9.2 s
0-200 mph
0-322 km/h
36.3 s
-
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Likely limited
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
Likely limited
Drag race simulation
60 ft
18 m
1.8 s
1.9 s
330 ft
101 m
4.7 s
4.9 s
1/8 mile
201 m
6.9 s
7.2 s
1000 ft
305 m
8.8 s
9.2 s
1/4 mile
402 m
10.4 s
10.9 s
Trap speed
1/4 mile
402 m
226 km/h
141 mph
218 km/h
136 mph

Power comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)Turbo 3.8
540 hp
403 kW
Porsche911 (991)GT3 RS 4.0
500 hp
373 kW

Porsche 911 (991 II) Turbo 3.8 has 40 hp more than Porsche 911 (991) GT3 RS 4.0.

The biggest power difference is between Porsche 911 (991) GT3 RS 4.0 and Porsche 911 (991 II) Turbo 3.8: 40 hp (30 kW).

Torque comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)Turbo 3.8
710 Nm
524 lb-ft
Porsche911 (991)GT3 RS 4.0
460 Nm
339 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)Turbo 3.8
1,595 kg
3,516 lb
Porsche911 (991)GT3 RS 4.0
1,420 kg
3,131 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)Turbo 3.8
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Porsche911 (991)GT3 RS 4.0
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 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)Turbo 3.83.0 s
Porsche911 (991)GT3 RS 4.03.3 s

The biggest 0-100 km/h difference is between Porsche 911 (991 II) Turbo 3.8 and Porsche 911 (991) GT3 RS 4.0: 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 (991 II)Turbo 3.8
9.1 L/100 km
25.8 mpg US
31.0 mpg UK
Porsche911 (991)GT3 RS 4.0
12.7 L/100 km
18.5 mpg US
22.2 mpg UK

The biggest fuel consumption difference is between Porsche 911 (991 II) Turbo 3.8 and Porsche 911 (991) GT3 RS 4.0: 3.6 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
Porsche911 (991 II)Turbo 3.8
339 hp/t
252 kW/t
3.0 kg/hp
Porsche911 (991)GT3 RS 4.0
352 hp/t
263 kW/t
2.8 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)Turbo 3.8
747 km
464 mi
Porsche911 (991)GT3 RS 4.0
504 km
313 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
Porsche911 (991 II)Turbo 3.8
540 hp
403 kW
3.0 s
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Porsche911 (991)GT3 RS 4.0
500 hp
373 kW
3.3 s
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 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)Turbo 3.8
Power
540 hp
403 kW
0-100 km/h3.0 s
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Doors/seats
2 doors
4 seats
Trunk
115 L
4.1 cu ft
Length
4,507 mm
177.4 in
Height
1,297 mm
51.1 in
Porsche911 (991)GT3 RS 4.0
Power
500 hp
373 kW
0-100 km/h3.3 s
Top speed
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
Doors/seats
2 doors
2 seats
Trunk
125 L
4.4 cu ft
Length
4,545 mm
178.9 in
Height
1,291 mm
50.8 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)Turbo 3.8
Power
540 hp
403 kW
0-100 km/h3.0 s
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
9.1 L/100 km
25.8 mpg US
31.0 mpg UK
Porsche911 (991)GT3 RS 4.0
Power
500 hp
373 kW
0-100 km/h3.3 s
Top speed
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
12.7 L/100 km
18.5 mpg US
22.2 mpg UK

Porsche 911 (991 II) 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)Turbo 3.8
9.1 L/100 km
25.8 mpg US
31.0 mpg UK
3.0 s
Porsche911 (991)GT3 RS 4.0
12.7 L/100 km
18.5 mpg US
22.2 mpg UK
3.3 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 (991 II)Turbo 3.8
339 hp/t
252 kW/t
3.0 kg/hp
9.1 L/100 km
25.8 mpg US
31.0 mpg UK
Porsche911 (991)GT3 RS 4.0
352 hp/t
263 kW/t
2.8 kg/hp
12.7 L/100 km
18.5 mpg US
22.2 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorsche911 (991 II)Turbo 3.8Porsche911 (991)GT3 RS 4.0
Power
540 hp
403 kW
500 hp
373 kW
Torque
710 Nm
524 lb-ft
460 Nm
339 lb-ft
Acceleration
3.0 s
3.3 s
Top speed
Unrestricted
330 km/h205 mph
Restricted
320 km/h199 mph
Unrestricted
320 km/h199 mph
Restricted
310 km/h193 mph
Lightness
1,595 kg
3,516 lb
1,420 kg
3,131 lb
Fuel consumption
9.1 L/100 km
25.8 mpg US
31.0 mpg UK
12.7 L/100 km
18.5 mpg US
22.2 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
115 L
4.1 cu ft
Length
4,507 mm
177.4 in
Height
1,297 mm
51.1 in
Doors/seats
2 doors
2 seats
Trunk
125 L
4.4 cu ft
Length
4,545 mm
178.9 in
Height
1,291 mm
50.8 in
Range score
747 km
464 mi
504 km
313 mi
CO2 score
212 g/km
296 g/km
Trunk score
115 L
4.1 cu ft
125 L
4.4 cu ft
Power-to-weight score
339 hp/t
252 kW/t
3.0 kg/hp
352 hp/t
263 kW/t
2.8 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 (991 II) Turbo 3.8Porsche 911 (991) GT3 RS 4.0
Consumption9.1 L/100 km25.8 mpg US31 mpg UK12.7 L/100 km18.5 mpg US22.2 mpg UK
Cost / 100 km15.92 LC100 km22.22 LC100 km
Cost / 100 mi25.63 LC100 mi35.77 LC100 mi
Annual fuel used1,365 L361 US gal300 UK gal1,905 L503 US gal419 UK gal
Annual fuel cost2,389 LC/year3,334 LC/year

Head-to-head comparisons

Porsche 911 (991 II) Turbo 3.8

  • Has 40 hp more
  • Has 250 Nm more
  • Is 0.3 s quicker from 0-100 km/h
  • Has 10 km/h (6 mph) higher top speed
  • Uses 3.6 L/100 km less fuel
  • Has 243 km (151 mi) more estimated range
  • Emits 84 g/km less CO2

Pros

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

Cons

  • Heaviest
  • Smallest trunk

Porsche 911 (991) GT3 RS 4.0

  • Is 175 kg lighter
  • Has 14 hp/t better power-to-weight
  • Has 10 L more trunk volume

Pros

  • Lightest
  • Best power-to-weight ratio
  • Largest trunk

Cons

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

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