© 2019 Yuey Tan

The GT3 Cup Car

The Porsche 911 GT3 Cup (Type 991 II)

  • Single-seated, near-standard race vehicle

  • Based on the 911 GT3​

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February 20, 2019

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Engine

  • Aluminum six-cylinder rear-mounted boxer engine

  • Sealed

  • 3,996 cm³; stroke 81.5 mm; bore 102 mm

  • Max. power: 357 kW (485 hp) at 7,500 rpm

  • Max. rpm: 8,500 rpm

  • Single-mass flywheel

  • Water cooling with heat management for engine and gearbox

  • Four valves per cylinder

  • Sequential multi-point fuel injection

  • Required fuel quality: minimum 98 octane, unleaded

  • Dry-sump lubrication

  • Electronic engine management (Bosch MS 4.6)

  • Race exhaust system with regulated race catalytic converter

  • Rear silencer with centered exhaust pipes

  • Electronic acceleration pedal

Transmission

  • Porsche six-speed sequential dog-type gearbox

 
Gear ratios:


Ring & pinion gear    14/22 i = 1.571
Final drive    17/41 i = 2.412
1st gear    13/41 i = 3.154
2nd gear    17/40 i = 2.353
3rd gear    19/36 i = 1.895
4th gear    19/29 i = 1.526
5th gear    24/30 i = 1.250
6th gear    34/35 i = 1.029

  • Internal pressure-oil lubrication with active oil cooling

  • Limited slip differential

  • Triple-disc sintered metal race clutch

  • Pneumatic paddle shift system