Signal Green Porsche 991 GT3 RS Track Monster: Apex Wheels and PFC Brakes Upgrade at Murtha Motorsports
We recently enhanced a striking Signal Green Porsche 991 GT3 RS at Murtha Motorsports in Gilbert, Arizona. This model, already known for its track prowess, has been elevated into an even more formidable machine with top-tier components from Apex and Performance Friction Brakes (PFC), supplied by our partners at BBI Autosport.
PFC Brakes 380S Big Brake Kit
We fitted the Performance Friction 380S Big Brake Kit, utilizing the same features and technology found on the 991 GT3 Cup Cars straight from the factory. This upgrade is designed to provide superior braking performance, ensuring that the GT3 RS can easily handle the track.
Key Features of the PFC Brakes 380S Big Brake Kit:
Motorsport Calipers
The kit includes the advanced ZR95 6-piston front and ZR96 4-piston rear calipers. These calipers are forged from high-strength aluminum and are designed to offer exceptional stiffness and performance, even at elevated temperatures.
Lighter: Innovative FEA-optimized design ensures the lightest total corner package.
Stiffer: The monobloc design increases stiffness, allowing for better pedal response, more control, zero vibration, and quicker release time.
Cooler: Patented rocket nozzle insulators and superior piston caps reduce caliper temperature, increasing stiffness and reducing drag.
Zero Drag: PFC’s advanced caliper design eliminates drag during braking transitions, maximizing stopping power and improving pedal response. Traditional calipers often suffer from residual drag, which can rob the vehicle of valuable horsepower and increase wear on the brake components. PFC’s Zero Drag technology ensures that the calipers retract fully after braking, allowing the brake pads to disengage entirely from the disc. This enhances braking performance and reduces heat buildup, wear, and energy loss, leading to quicker acceleration out of corners and improved overall lap times.
Advanced Disc Assemblies
The 380 x 34mm front and 380 x 30mm rear disc assemblies are engineered with PFC’s patented V3 technology. These slotted discs are designed to reduce weight, simplify installation, and offer better cooling with high thermal stability. The unique slot pattern enhances initial bite and helps clean the brake pads, all while resisting crack propagation.
V3 Disc Retention Ring Technology: The V3 technology introduces a novel two-turn retention ring system that securely holds the hat and disc. Unlike traditional bolted setups, this retention ring allows quick and tool-free disc changes, drastically reducing installation time and complexity. This method not only saves time but also reduces the overall weight of the braking system, improving the vehicle's handling and performance. The retention ring sits in a groove in the hat that overlaps the disc flanges, effectively locking the disc to the hat, ensuring a secure fit without needing torque wrenches or hassle.
High Thermal Stability: The V3 disc assemblies are engineered to withstand high thermal loads without warping or degradation. The 48-vane geometry enhances cooling efficiency, ensuring consistent performance even under extreme track conditions.
Reduced Weight: The V3 design reduces the braking system's unsprung weight by integrating lightweight aluminum hats with the disc assemblies, which improves handling and responsiveness on the track.
Enhanced Slot Pattern: The patented slot pattern improves the brake pads' initial bite and helps clean the pad surface, reduce debris buildup, and enhance overall braking performance. This design also prevents the formation of disc cracks, ensuring longer disc life and reliability.
PFC 11 Pad Compound:
Ideal for sprint and medium-distance races, offering smooth bite, rising friction over temperature, superior disc conditioning, and easy control. This ultra-smooth compound reduces wheel locking at the end of a stop and provides good fade resistance.
Wheels: Apex EC-7RS
To complement the new braking system, we fitted the car with Apex EC-7RS wheels, sized 19x10 at the front and 19x13 at the rear. These wheels are known for their strength, lightweight construction, and excellent brake clearance, making them the perfect match for the PFC Big Brake Kit.
Key Features of the Apex EC-7RS Wheels:
10K Ton Forged 6061-T6 Aluminum: Formed under extreme pressure to eliminate porosity and improve grain structure for maximum strength.
Side-Milled Spokes: Wider and deeper side-milled spokes remove excess material, enhancing strength without unnecessary weight.
Stronger Sprint Spec Inner Lip: A reinforced design for high durability, even under extreme track conditions.
Massive Brake Clearance: High-clearance barrel design and vehicle-specific spoke profiles ensure compatibility with big brake kits.
Paintless Knurled Beads: Unpainted knurled beads maximize tire grip, preventing tire slip during hard braking and acceleration.
Unmatched Replacement Program & Lifetime Structural Warranty: Apex stands behind its product with industry-leading support and warranties.
Independently Tested and Certified: Rigorous testing ensures exceptional performance and safety standards.
Weight Optimization: Extensive Finite Element Analysis (FEA) reinforces high-stress areas and removes unnecessary material, resulting in a lightweight wheel without compromising strength.
Deeper Concavity: Redesigned forging profiles to create deeper, concave spoke profiles for optimized aesthetics and performance.
Corner Balance and Alignment: Precision Tuning for Track Handling
After installing the PFC brakes and Apex wheels, we performed precise corner balancing and alignment. Using ProPlus HUBStands and Longacre Scales, we meticulously adjusted the bump steer, corner weight, camber, caster, ride height, and toe. This process ensures optimized handling, stability, and tire performance, preparing the car for superior track performance. Whether fine-tuning for better lap times or improved handling, our expert adjustments make this GT3 RS a formidable track contender.
Results: The Perfect Track Monster
With the PFC Brakes 380S Big Brake Kit and Apex EC-7RS wheels, this Signal Green Porsche 991 GT3 RS is equipped for superior performance on the track. The car now features unparalleled braking efficiency, reduced weight, and improved handling, making it a true track monster. At Murtha Motorsports, we offer top-tier performance upgrades, ensuring you get the best for your vehicle. If you want to upgrade your Porsche or any other high-performance vehicle, contact us today to learn more about our services and how we can help you achieve your automotive goals.
