Porsche 991.1 GT3 Cup Technical Information
Suspension & Steering
- Front suspension Independent McPherson strut with double clamped upright
- Rear suspension Independent multi-link rear suspension
- Steering The hydraulic power steering is derived from the 911 GT3 Cup (997)while the power steering pump has its origins in the 911 GT3 R
- Hydraulic oil filling quantity:0.65 liters (0.69 qts)
- System pressure: 96 bar (1,392 psi)
Wheels & Tyres
- Single Piece Forged Aluminum Center Mount Wheels
- Front 10.5J x 18″
- Rear 12J x18″
- Tyres Front (Delivery specification) Michelin 27 / 65-18 slicks
- Rear (Delivery specification) Michelin 31 / 71-18 slicks
- Centre lock Front and rear axles
Brakes
- Dual-circuit hydraulic brakes system with two separate main cylinders. The front to rear brake balance can be changed by rotating the brake balance knob
- Front brake disc One piece steel – Diameter = 380 mm, Brake disc thickness 32 mm, 6 piston – aluminum brake caliper.
- Rear brake disc One piece steel – Diameter = 380 mm, Brake disc thickness 30 mm, 4 piston – aluminum brake caliper.
Chassis
Based on the previous model, the following major development objectives were set and implemented in the chassis for the new 911 GT3 Cup (991):
- Extension of the wheel base by 100 mm (3.94 inches)
- Front and rear axle redesign with optimized kinematics
- All joints in Uniball design for maximum system stiffness
- Brake system improvement
- Increase in axle stiffness
- Improved brake balance setting
Interior
- Trim without noise insulation, integral roll cage
- The interior design Focuses on ergonomics and drivers safety. The center console is tilted towards the driver in order to improve accessibility of the control elements. Appearance improvements feature colored controls and a Cosworth data logger with colored display
- 100 litre street car fuel cell
- FIA homologated Recaro racing bucket seat with longitudinal adjustment
- 6 Point safety harness
- HANS System All cars from the 2004 model onwards are optimised for the HANS safety system
- Fire extinguisher system, compliant with FIA standard
Dimensions & Weight
- Length 4547 mm
- Width 1848 mm over front axle – 1862 mm over rear axle
- Wheelbase 2463 mm
- Dry Weight ca. 1200 kg
Fluid Capacities
- Fuel system 100 L.
- Gearbox 3.0 L after rebuild
- New Engine ca.11 L. (The Oil level check should be carried out with the dipstick, through the filler neck with the engine at operating temperature and running at idle speed).
- Engine 8.3L including oil filter change; 8.1L without oil filter change
Lubricants & Fuel
- Engine oil Mobil 1 (0W – 40)
- Coolant 22L
- Recommendation: 2L anti-corrosion additive + approximately 20L water. (Part # 997 106 907 90)
- Gearbox oil ‘Mobilube’ SHC
- Steering servo oil ‘Pentosin’
- Fuel 98 RON Super Plus unleaded
- Brake fluid Racing Brake Fluid-325° (DOT 4)
- Air jack A pressure of 35-38 bars is necessary to operate the air jacks.
