10/06/2009
Porsche 992 GTS: Mastering Brakes for Road and Track
The Porsche 992 GTS, a marvel of automotive engineering, offers an exceptional driving experience, particularly with its factory-fitted ceramic brake discs and calipers. These components are undeniably superb for everyday road use, providing confidence-inspiring stopping power and a refined feel. However, for owners who relish pushing their machines on the track, the high-performance ceramic discs, while brilliant, can present a significant concern. The intense heat generated during track sessions can lead to damage, including oxidation, which can compromise their longevity and performance, not to mention the considerable expense associated with their replacement.
Recognising this common owner dilemma, reputable specialists like Litchfield have developed a compelling alternative: a replacement steel disc option that leverages the proven technology of leading brake manufacturers. This article delves into the specifics of upgrading your 992 GTS's braking system with high-quality steel discs and explores the advantages of using performance brake pads from renowned brands like PFC (Performance Friction Corporation).
The Case for Steel: Durability and Cost-Effectiveness
While Porsche's ceramic composite brakes are a technological tour de force, their vulnerability to extreme heat on track days is well-documented. For those who frequently venture onto circuits, the financial outlay for repairing or replacing damaged ceramic discs can be substantial. This is where the appeal of a robust steel disc conversion becomes particularly strong.
A prime example of such an upgrade utilises Alcon's extensive disc technology. Alcon is a name synonymous with high-performance braking solutions, supplying top-tier components to numerous motorsport and OEM road car manufacturers. Their steel discs have a proven track record, having been used since 2011 on the significantly heavier Nissan GT-R. This extensive real-world application underscores the inherent quality and durability of their product. The materials and design elements employed in these steel discs are carefully selected to offer an ideal solution for drivers who enjoy the versatility of using their car both on the road and on the track, providing a balance of performance and practicality.
Alcon's Engineering Prowess
Alcon's reputation is built on a foundation of supplying critical braking components to elite racing departments, including those of BMW, Corvette, and VW. Furthermore, they are trusted suppliers for prestigious road car manufacturers such as Bentley, McLaren (for the P1), Praga, and the Aston Martin Valkyrie. This broad OEM engagement highlights Alcon's deep understanding of the performance levels demanded by discerning drivers and their ability to meet those expectations consistently.
The design of these Alcon steel discs incorporates features specifically engineered to manage heat effectively. The curved internal ventilation design facilitates a rapid and consistent distribution of heat away from the friction surfaces. This is crucial for maintaining braking performance under sustained load. In addition to the advanced ventilation, the Alcon discs also feature distinctive C-shaped grooves on the surface. These grooves serve a dual purpose: they help to deglaze the brake pads, ensuring a clean and consistent contact surface, and they also contribute to further cooling by increasing the surface area and promoting airflow.
Disc Size Comparison: 992 GTS vs. Alcon Upgrade
A key aspect of any brake upgrade is ensuring the new components are appropriately sized to maintain the vehicle's intended brake bias and overall performance balance. The Alcon disc conversion for the 992 GTS boasts impressive dimensions:
| Brake Component | Alcon Steel Disc Size (mm) | 992 GTS Factory Steel Disc Size (mm) |
|---|---|---|
| Front Disc | 412 x 36 | 408 x 36 |
| Rear Disc | 390 x 32.8 | 380 x 30 |
As the table illustrates, the Alcon steel discs offer a slight increase in diameter and thickness for both the front and rear axles compared to the factory steel discs found on the 992 GTS and Turbo models. These dimensions are not only substantial in their own right but are carefully chosen to work with the existing calipers and maintain optimal brake distribution, ensuring a balanced and predictable braking feel. This subtle increase in surface area and thermal mass can contribute to improved fade resistance and overall braking performance, especially during prolonged track use.
The Power of PFC Pads: Choosing Your Compound
Complementing a high-quality disc upgrade is the selection of appropriate brake pads. Performance Friction Corporation (PFC) is a leading name in high-performance braking technology, with a strong pedigree in motorsport. Manufactured in the USA, PFC pads are the preferred choice for many top racing teams globally, testament to their consistent performance and durability.
PFC offers a range of compounds designed for specific applications, ensuring drivers can select the ideal pad for their needs. For the Porsche 992 GT3 (and by extension, suitable for the GTS), PFC pads are available in the following compounds:
- 11 Compound: This compound is engineered for sprint and medium-distance racing. It offers a strong initial bite, providing exceptional control and superior disc conditioning. The friction material is ultra-smooth and developed to minimise wheel locking at the end of a braking event. Its wear characteristics are comparable to PFC's legendary 01 compound, exhibiting virtually zero taper wear when used in a properly designed race caliper. It's ideal for venues with medium-low grip where control and modulation are paramount.
- 13 Compound: Representing a new generation of high-bite, high-friction materials, the 13 Compound was developed from the 01 compound with enhanced bite and modulation. It boasts superior disc conditioning and release characteristics for exceptional control. This compound is ultra-smooth and performs exceptionally well on tracks with high grip or in conjunction with high downforce cars. It has already achieved race wins, demonstrating its potent combination of aggressive bite and refined control. Its wear rate is on par with the 01 compound, and it can operate at higher temperatures, offering excellent fade resistance. The 13 Compound is recognised for having one of the lowest taper wear rates among high-bite, high-torque pads when used in a suitable race caliper.
- 331 Compound: This is PFC's next-generation endurance material, designed for endurance racing and track day enthusiasts. It offers improved control, particularly with ABS systems, and is gentle on the brake rotors. The 331 Carbon Metallic compound has been developed with a higher initial bite than PFC's well-regarded 08 endurance compound. It features improved release characteristics, continuing to deliver exceptional control and feel. With a low wear rate and excellent disc conditioning, the 331 compound is perfect for endurance applications on the front axle, especially for cars with ABS such as GT3, GT4, Touring Cars, and track day vehicles. It is also an excellent choice for Clubsport and Cup models equipped with ABS.
Why Choose PFC? The Benefits
The primary advantage of PFC pads, as highlighted by many users, is their consistent performance lap after lap and their remarkably low wear rates. Unlike some other performance pads, PFC compounds are designed to resist overheating, maintaining their effectiveness even under sustained high-temperature conditions. While the initial purchase price might be slightly higher than some competitors, the extended lifespan of PFC pads often translates into significant long-term savings, as they can last twice as long, if not more, in many applications.
Furthermore, PFC pads are notably less harsh on brake rotors compared to many other performance compounds. This reduced rotor wear contributes to lower overall running costs. In braking, tyre grip is often the ultimate limiting factor, and PFC pads are designed to provide all the stopping power you need, ensuring you can fully exploit the available traction.
PFC pads are also suitable for occasional road use when transitioning to and from the track. While, like most race-oriented pads, they may exhibit less initial bite when cold and might occasionally produce some noise, they function perfectly well for street driving. The performance benefits and cost savings they offer, particularly for track-focused driving, make them a highly compelling choice for owners of high-performance Porsches.
Frequently Asked Questions
Q1: Will the Alcon steel discs fit my 992 GTS without modification?
Yes, these are designed as a direct replacement or upgrade, leveraging the existing caliper mounting points and intended brake bias. Specific fitment should always be confirmed with the supplier.
Q2: Are PFC pads suitable for everyday road use?
PFC pads are primarily designed for track use. While they can be used on the road, they may have less initial bite when cold and might produce some noise. For dedicated daily drivers, a different pad compound might be more suitable, but for occasional road use between track sessions, they are generally acceptable.
Q3: How do the Alcon steel discs compare to the factory ceramic discs on track?
The Alcon steel discs offer a more cost-effective and durable solution for track use, being less susceptible to heat damage and oxidation than ceramic discs. While ceramic discs may offer superior initial bite and feel in some conditions, the Alcon steel discs provide excellent performance and longevity for demanding track environments.
Q4: Which PFC pad compound should I choose for my 992 GTS?
For sprint racing and maximum control, the 11 or 13 compounds are excellent choices. For endurance racing or track days where longevity and ABS compatibility are key, the 331 compound is highly recommended. Consider your typical usage and track conditions when making your selection.
Q5: Can I use different brands of brake pads with the Alcon discs?
Yes, the Alcon steel discs are designed to be compatible with a wide range of performance brake pads, offering flexibility in your setup. However, always ensure that the chosen pads are compatible with the disc size and intended application.
In summary, upgrading your Porsche 992 GTS with Alcon steel discs and selecting the appropriate PFC brake pads provides a robust, cost-effective, and high-performance braking solution that excels in both road and track environments. This combination ensures you can enjoy your car to its fullest potential with confidence in your braking system.
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