Porsche 991 GT America Technical Information
Summary
In 2013 Porsche Motorsport North America, Inc. announced that production in Stuttgart, Germany had commenced on the 2014 Porsche 911 GT America, a race car based on the Porsche 911 GT3 Cup. The car was designed exclusively for the new United Sports Car Racing series GT Daytona class for 2014.
The new car was delivered starting in October, 2013 and offered for sale to those teams committed to running the entire 2014 USCR season.
The 911 GT America features a Porsche flat-six 4.0 liter racing engine which will produce 470 hp and utilizes a six-speed sequential gearbox with pneumatic paddle shift system and electronic throttle. The car is based on the Porsche 911 GT3 Cup racer that currently exclusively runs in the Porsche Supercup series, and features lightweight bodywork with aluminum-steel composite construction, a fuel safety cell with new quick-fill connection, new color Cosworth dash display, and new safety equipment including a rescue opening in the roof allow use of the KED system for driver stabilization.
A newly developed race braking system further improved the excellent endurance qualities compared to its successful predecessor. The 380 millimeter slotted and inner-vented steel brake rotors at the front axle are decelerated by six-piston aluminium fixed calipers. The rear axle features a four-piston version.
Retailing at $269,000 (FOB Weissach, plus shipping and parts package), the new Porsche 911 GT America was sold in North America exclusively by Porsche Motorsport North America, Inc., based in Santa Ana, California.
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 265/645 ZR 18
- Rear 325/710 ZR 18
- 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
- For the aerodynamics, it comes with new front spoiler, a new design rear cover and carbon-fiber undertray to maximize aerodynamic balance with USCR-spec rear wing
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 4491 mm
- Front Track Width 1538 mm
- Rear Track Width 1516 mm
- Width 1808 mm
- Wheelbase 2450 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.
