Car comparison

Porsche 911 (991 II) GT3 4.0vsPorsche 911 (991) GT3 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 ccGasolineRWDDual-clutchNaturally aspiratedCoupe2017-2018
VS

Porsche 911 (991)

GT3 3.8

475 hp3799 ccGasolineRWDDual-clutchNaturally aspiratedCoupe2013-2017

Comparison overview

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

Best choices

Porsche 911 (991 II) GT3 4.0

  • Quickest 0-100 km/h
    3.4 s
  • Fastest top speed
    318 km/h
    198 mph
  • Most powerful
    500 hp
    373 kW
  • Highest torque
    460 Nm
    339 lb-ft
  • Lightest
    1,430 kg
    3,153 lb
  • Best power-to-weight
    350 hp/t
    261 kW/t
    2.9 kg/hp
  • Lowest highway consumption
    8.8 L/100 km
    26.7 mpg US
    32.1 mpg UK
  • Lowest CO2 emissions
    288 g/km
  • Best performance score
    88/100

Porsche 911 (991) GT3 3.8

  • Lowest combined fuel consumption
    12.4 L/100 km
    19.0 mpg US
    22.8 mpg UK
  • Lowest city consumption
    18.9 L/100 km
    12.4 mpg US
    14.9 mpg UK
  • Best estimated range
    516 km
    321 mi
  • Largest trunk
    385 L
  • Best overall score
    72/100
  • Best economy score
    74/100
  • Best practicality score
    41/100

Specification comparison

Specification comparison
ModelPorsche911 (991 II)GT3 4.0Porsche911 (991)GT3 3.8
Power
500hp373kW
475hp354kW
Torque
460Nm339lb-ft
440Nm325lb-ft
Curb weight
1,430kg3,153lb
1,430kg3,153lb
Gross weight
1,777kg3,918lb
1,720kg3,792lb
Top speed
318 km/h
198 mph
315 km/h
196 mph
To 99% top speed
71.2s99% target: 315 km/h / 196 mph
Calculated
50.5s99% target: 312 km/h / 194 mph
Calculated
0-100 km/h
3.4s
3.5s
0-200 km/h
11.0s
9.9s
Calculated
0-60 mph
3.2s
Calculated
3.3s
Calculated
Fuel consumption
12.7L/100 km18.5mpg US22.2mpg UK
12.4L/100 km19mpg US22.8mpg UK
Fuel consumption city
19.4L/100 km12.1mpg US14.6mpg UK
18.9L/100 km12.4mpg US14.9mpg UK
Fuel consumption highway
8.8L/100 km26.7mpg US32.1mpg UK
8.9L/100 km26.4mpg US31.7mpg UK
Quarter mile
11.3s
Calculated
11.2s
Calculated
Power-to-weight
350hp/t261kW/t159hp/1000 lb
Calculated
332hp/t248kW/t151hp/1000 lb
Calculated
Torque-to-weight
322Nm/t215lb-ft/ton
Calculated
308Nm/t206lb-ft/ton
Calculated
Estimated range
504km313mi
Calculated
516km321mi
Calculated
Displacement
3,996cc244cu in
3,799cc232cu in
Length
4,562mm180in
4,545mm179in
Width
1,852mm73in
1,852mm73in
Height
1,271mm50in
1,269mm50in
Wheelbase
2,457mm97in
2,457mm97in
Front track
1,551mm61in
1,551mm61in
Rear track
1,555mm61in
1,555mm61in
Ground clearance
88mm3in
-
Trunk volume
125L
385L
Doors
2
2
Seats
2
2
Fuel tank
64L
64L
CO2 emissions
288g/km
289g/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 (991) GT3 3.8PowerTorque
  • Porsche 911 (991 II) GT3 4.0: Power / Torque
  • Porsche 911 (991) GT3 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 (991)GT3 3.88,250 rpm6,250 rpm8,500 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorsche911 (991 II)GT3 4.0Porsche911 (991)GT3 3.8
Acceleration checkpoints
0-60 mph
0-97 km/h
3.2 s
3.3 s
0-100 km/h
0-62 mph
3.4 s
3.5 s
0-200 km/h
0-124 mph
11.0 s
9.9 s
Top speed
318 km/h
198 mph
315 km/h
196 mph
Drag race simulation
60 ft
18 m
1.8 s
2.0 s
330 ft
101 m
4.9 s
5.0 s
1/8 mile
201 m
7.3 s
7.4 s
1000 ft
305 m
9.5 s
9.4 s
1/4 mile
402 m
11.3 s
11.2 s
Trap speed
1/4 mile
402 m
203 km/h
126 mph
213 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 (991)GT3 3.8
475 hp
354 kW

Porsche 911 (991 II) GT3 4.0 has 25 hp more than Porsche 911 (991) GT3 3.8.

The biggest power difference is between Porsche 911 (991) GT3 3.8 and Porsche 911 (991 II) GT3 4.0: 25 hp (19 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 (991)GT3 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 (991 II)GT3 4.0
1,430 kg
3,153 lb
Porsche911 (991)GT3 3.8
1,430 kg
3,153 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
318 km/h
198 mph
Porsche911 (991)GT3 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 4.03.4 s
Porsche911 (991)GT3 3.83.5 s

The biggest 0-100 km/h difference is between Porsche 911 (991 II) GT3 4.0 and Porsche 911 (991) GT3 3.8: 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
Porsche911 (991 II)GT3 4.0
12.7 L/100 km
18.5 mpg US
22.2 mpg UK
Porsche911 (991)GT3 3.8
12.4 L/100 km
19.0 mpg US
22.8 mpg UK

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
350 hp/t
261 kW/t
2.9 kg/hp
Porsche911 (991)GT3 3.8
332 hp/t
248 kW/t
3.0 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
504 km
313 mi
Porsche911 (991)GT3 3.8
516 km
321 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
3.4 s
318 km/h
198 mph
Porsche911 (991)GT3 3.8
475 hp
354 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/h3.4 s
Top speed
318 km/h
198 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 (991)GT3 3.8
Power
475 hp
354 kW
0-100 km/h3.5 s
Top speed
315 km/h
196 mph
Doors/seats
2 doors
2 seats
Trunk
385 L
13.6 cu ft
Length
4,545 mm
178.9 in
Height
1,269 mm
50.0 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
Porsche911 (991 II)GT3 4.0
Power
500 hp
373 kW
0-100 km/h3.4 s
Top speed
318 km/h
198 mph
12.7 L/100 km
18.5 mpg US
22.2 mpg UK
Porsche911 (991)GT3 3.8
Power
475 hp
354 kW
0-100 km/h3.5 s
Top speed
315 km/h
196 mph
12.4 L/100 km
19.0 mpg US
22.8 mpg UK

Porsche 911 (991) GT3 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
12.7 L/100 km
18.5 mpg US
22.2 mpg UK
3.4 s
Porsche911 (991)GT3 3.8
12.4 L/100 km
19.0 mpg US
22.8 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
350 hp/t
261 kW/t
2.9 kg/hp
12.7 L/100 km
18.5 mpg US
22.2 mpg UK
Porsche911 (991)GT3 3.8
332 hp/t
248 kW/t
3.0 kg/hp
12.4 L/100 km
19.0 mpg US
22.8 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorsche911 (991 II)GT3 4.0Porsche911 (991)GT3 3.8
Power
500 hp
373 kW
475 hp
354 kW
Torque
460 Nm
339 lb-ft
440 Nm
325 lb-ft
Acceleration
3.4 s
3.5 s
Top speed
318 km/h
198 mph
315 km/h
196 mph
Lightness
1,430 kg
3,153 lb
1,430 kg
3,153 lb
Fuel consumption
12.7 L/100 km
18.5 mpg US
22.2 mpg UK
12.4 L/100 km
19.0 mpg US
22.8 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
2 seats
Trunk
385 L
13.6 cu ft
Length
4,545 mm
178.9 in
Height
1,269 mm
50.0 in
Range score
504 km
313 mi
516 km
321 mi
CO2 score
288 g/km
289 g/km
Trunk score
125 L
4.4 cu ft
385 L
13.6 cu ft
Power-to-weight score
350 hp/t
261 kW/t
2.9 kg/hp
332 hp/t
248 kW/t
3.0 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 (991) GT3 3.8
Consumption12.7 L/100 km18.5 mpg US22.2 mpg UK12.4 L/100 km19 mpg US22.8 mpg UK
Cost / 100 km22.22 LC100 km21.70 LC100 km
Cost / 100 mi35.77 LC100 mi34.92 LC100 mi
Annual fuel used1,905 L503 US gal419 UK gal1,860 L491 US gal409 UK gal
Annual fuel cost3,334 LC/year3,255 LC/year

Head-to-head comparisons

Porsche 911 (991 II) GT3 4.0

  • Has 25 hp more
  • Has 20 Nm more
  • Is 0.1 s quicker from 0-100 km/h
  • Has 3 km/h (2 mph) higher top speed
  • Has 17 hp/t better power-to-weight
  • Emits 1 g/km less CO2

Pros

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

Cons

  • Highest combined fuel consumption
  • Smallest trunk

Porsche 911 (991) GT3 3.8

  • Uses 0.3 L/100 km less fuel
  • Has 12 km (8 mi) more estimated range
  • Has 260 L more trunk volume

Pros

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

Cons

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

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche 911 (991 II) GT3 4.0
Porsche 911 (991) GT3 3.8
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Porsche 911 (991 II) GT3 4.0 vs Porsche 911 (991) GT3 3.8 - car comparison - FastVsFaster