PORSCHE 911 GT3 CUP

The Porsche 911 GT3 CUP (Type 997 MK2) is based on the lightweight 911 RS (977) street sports car. The power unit largely identical to the production engine of the 911 GT3 RS with the same output of 450 bhp and the same maximum engine speed of 8,500 rpm. A race exhaust system with a controlled catalytic converter keeps emissions to a minimum.

Engine
Aspirated engine
Water cooled flat six-cylinder boxer engine with four valves per cylinder
3,797 cc; stroke 76.4 mm; bore 102.7 mm diameter
Max. power: 331 kW (450 hp) at 7,500 rpm
Max. rpm: 8,500 rpm
Required fuel quality: 98 octane ROZ, unleaded
Dry-sump lubrication
Sequential multi-point fuel injection
Electronic engine management MS3.1 by Bosch
Race exhaust system with regulated race catalytic converter
Twin-branched muffler with centered exhaust pipes

 

Powertrain
Six-speed sequential dog-type gearbox (G97/63) with active oil cooling and pressure-oil lubrication

Gear ratios:
Ring & pinion gear 8/32 i = 4,000
1st gear 12/38 i = 3.167
2nd gear 15/32 i = 2.133
3rd gear 18/31 i = 1.722
4th gear 20/28 i = 1.400
5th gear 23/26 i = 1.300
6th gear 29/27 i = 0.931

Limited slip differential 37 % / 52 %
Single-mass flywheel
Race clutch (5½” triple-disc sintered-metal clutch)
Hydraulic clutch centre-release mechanism
Oil-water heat exchanger

Front Suspension
Front axle McPherson strut-type axle, height-adjustable
Front axle wheel suspension with twin-clamp system
Double coil springs with race setup (main spring and helper spring)
Sachs gas pressure shock absorbers
Front axle control arm with six-point-suspension
Two-piece lower control arms for camber adjustment
Longitudinal control arm
Double-blade-type anti-roll bar, seven setting options per side
Forged supporting mounts with Unibal
Reinforced, continuously variable rear axle track rod
Power steering with electro-hydraulic pressure feed
Modified steering-column assembly (adjustable in height and length)

 

Rear Suspension
Rear axle Multilink rear suspension with solidly mounted subframe
Suspension struts height-adjustable
Wheel suspension with optimised wheel hub
Double coil springs with race setup (main spring and helper spring)
Sachs gas pressure shock absorbers
Modified axle side parts
Two-piece lower control arms for camber adjustment
Unibal – suspended control arm (top)
Longitudinal control arm
Double-blade-type anti-roll bar, seven setting options per side
Reinforced, continuously variable rear axle track rod

 

Brakes
2 independent brake circuits, adjustable via break balance system and 2 master brake cylinders

Front:
Aluminium six-piston calipers, in red
Steel brake discs (compound molding) internally vented,
380 mm diameter
Special race brake pads without wear indicator (P50)
Optimized ventilation routing

Rear:
Aluminium four-piston calipers, in red
Steel brake discs (compound molding) internally vented,
355 mm diameter
Special race brake pads without wear indicator (P50)
Optimized ventilation routing

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