Shine On You Crazy Diamond

By Jeremy Williams, Technical Editor

“Remember when you were young, you shone like the sun
Shine on you crazy diamond…”

These Pink Floyd lyrics describe a new component technology that Porsche debuted in 2017, which we’re seeing become more and more prevalent on Porsche vehicles today. Referred to as PSCB, Porsche Surface Coated Brakes were released on the 2017 Cayenne Turbo’s as a standard feature.

The PSCB’s are many cuts above the standard Porsche gray-iron brakes in that they typically last about 30% longer than gray-iron, they hardly produce any brake dust, and they don’t rust like gray-iron. At the same time, while they’re ultimately not as race-worthy as PCCB’s (Porsche Ceramic Composite Brakes), they have performance properties similar to PCCB’s, and yet the PSCB’s cost about 1/3 that of PCCB’s. So, in many ways the PSCB’s are the best of both worlds.

The special brake rotors in the PSCB setup are the first to be developed for any vehicle. Their surface is incredibly shiny, akin to a mirror-like finish which doesn’t tarnish and is made of tungsten carbide which is almost as hard as a diamond. WIDIA is an acronym for wie Diamant (the German translation is “like diamond”) and is the trade name for an amazingly hard material which is mainly comprised of tungsten carbide. In close collaboration with Bosch/Buderus, what Porsche developed using this technology as a guide, is quite astonishing.

A brake rotor made 100% of tungsten carbide would cost about 3x that of PCCB’s (which are silly expensive already), so Porsche had to get very creative with the construction of the PSCB rotors; a process that took ages to develop. They start with a gray-iron rotor which is lasered to give structure, then an interlayer of nickel helps bind the gray-iron and tungsten carbide, where the tungsten carbide particles are flame-sprayed onto the rotor at supersonic speeds. This results in a tungsten carbide coating which is about 100 micrometers thick. However, once the rotors were finally created, Porsche wasn’t done. Very special brake pads were also needed to complete the PSCB setup.

Since the brake rotor surface is so smooth, the brake pad compound needed to be engineered with very hard microscopic particles that would anchor in to the also-very hard tungsten carbide rotor coating. One would expect that such a unique brake pad would still produce considerable brake dust as it digs and bites into the brake rotor, however PSCB pads create an astonishing 90% less brake dust than gray-iron pads do. As well, the mirror-like rotor surface which has no grainy structure like a grey-iron rotor, actually allows for complete pad-rotor contact, which means the entire surface area of the rotor can be used for fully optimal braking performance. When the PSCB components get hot from repeated braking exercises, they don’t show signs of brake fade like standard gray-iron components. This places the performance output of PSCB’s close to that of PCCB’s, but remember that the PSCB’s are about 1/3 the price of PCCB’s.

Due to the gigantic reduction in brake dust from the PSCB technology, Porsche cleverly decided to market PSCB applications via a unique color for the 10-piston front calipers and 4-piston rear calipers. While “Big Red” brake calipers have previously signified Porsche’s best brakes, along came yellow calipers to signify the race-worthy PCCB’s. Now, white calipers signify PSCB’s. White brake calipers you ask?! Yes, what better way to communicate that the PSCB’s produce such little brake dust and therefore the calipers stay super clean!

So with PCCB-like performance for significantly less money, and major improvements over standard gray-iron brakes, what are the downsides to PSCB’s? The only one I’ve been able to come up with is regarding those who want to participate in more off-pavement driving with their Cayenne, yet keep in mind that this sticking point isn’t specific to only PSCB’s. As vehicles continue to grow in both size and performance output, larger and larger brake components are needed to help quickly slow these vehicles down. I’m all for the highest margin of safety and performance, so bigger brakes vs smaller brakes are definitely an attribute. However, in order to clear these huge brakes, a large wheel is needed (21″-22″ diameter wheels are the norm now), which means the profile/aspect ratio of the tire is thinner. What does this mean if you’re wanting to take your strong, durable, and more than capable Cayenne off-pavement for everything from reaching a favorite hiking trailhead to more serious overlanding? Thinner profile tires mean more possibility for wheel damage and tire punctures, a rougher ride, and less grip on uneven terrain. And since the brakes are so massive in diameter, you cannot easily reduce wheel diameter in order to inversely increase the tire’s sidewall height, you’re pretty much stuck with more fragile tires for off-pavement adventures. A possible solution? Hop in an older ’05-16 955/957/early958-generation Cayenne with its 18″ or 19″ wheels and taller tires, as this will also help you appreciate the numerous refinements of your ’17-18 late958-generation or ’19+ 9Y0/9Y3-generation Cayenne that much more!

Jeremy Williams is the Oregon PCA Technical Editor. He co-owns Matrix Integrated (Matrix Integrated Inc.) with his brother Justin. Jeremy can be reached at [email protected]

*Special thanks to SSF for much of the PSCB information.

 

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President's Message

Carol Hedstrom

People Power

I have been an advocate and cheerleader of our many volunteers for several years. This year we have
had even more members step up and help out! Clearly, in order to organize and host over 100 separate events, it takes some peoplepower. As we are at mid-year, I want to share an update on what our volunteers are doing for the Club. It’s your Club and we want all of you to enjoy the fun and of course help out if you feel inclined to do so. 

ORPCA’s Autocross Team layout courses, set up and take down cones, implement safety procedures, keep time, manage standings, train and encourage new drivers, and do it all at the break of dawn. This is a hardy, knowledge-heavy group of dedicated people who produce one of the strongest autocross organizations in the Pacific Northwest. If you have not participated in autocross, you should. You will be introduced to the sport by some of the best and probably become a better driver. 

Our Social Committee and volunteers organize our monthly dinners, scout locations for future events, and plan the new-member orientation as well as the holiday party. They also monitor tickets for each social event, help prevent allergic reactions, and are on the lookout for all mobility needs. Have you tried one of the new Road and Fork events? These small-scale, intimate, elevated experiences are the brainchild of the Social Committee. Cheers to this team! 

Drive Team volunteers scout routes and roads, lead drives, curate drive groups with leads and sweeps, check out potential stops for restroom breaks, maintain a large library of routes, handle oodles of pre-and-post drive logistics including insurance and follow-up reports. The drive team works closely with the Web Team to ensure that all drives (70+ this year) are listed and described accurately on our website and that registrations open in a timely manner to keep it easy for members to join in drives throughout the year. 

The Membership Team orders and distributes name badges and anniversary pins. Name badges are key, but only one element of the many tasks involved in the Membership purview. Team members are master spreadsheet and database gurus. When questions arise around membership dues: what’s included, when and how to pay, this Team jumps in and clears the confusion. Additionally, Membership and supporting volunteers staff our tents and booths at public events to encourage new members to join and answer all questions relating to ORPCA. 

Our new Community Outreach Committee is currently a small group of volunteers strategizing on how to serve others. This team guides our charitable giving efforts as well as finding opportunities to enhance our image and reputation in the small towns and cities we pass through on our drives. We will hear more from them as the year goes on. Please be sure to check out the June Anzeiger message from member Wendy Wells regarding this team effort. Your input is needed; remember, it’s your club and you can help guide the future. 

Web Team, oh geez, what don’t they do? The Web Team, together with Social Media and Member Email, are the heartbeat of your Club. These people guarantee that you know about drives and upcoming events, and that you can register for events. They maintain lists of who is attending, handle cancelations, provide instructions, share information, and announce changes when needed. 

Northwest Passage Team, a stand- alone, perpetual group, handcrafts an epic journey every spring and then does it again a few months later in the fall. These people know their stuff and are quick to adapt to conditions and unexpected events like road closures due to weather and those unfortunate seasonal fires that pop up in our part of the country. While on the tour they are alert to pitfalls like rocks on the road that may take out tires or create other hazards. They and the event they organize are an example of planning success on every level. 

Your member newsletter, Anzeiger, is produced by a team of people, but mainly the editor and editorial support team. They are joined by a small group of experienced proofreaders, and many member contributors. Anzeiger is a big monthly project that showcases our many events and entices members to participate in future events. 

ORPCA’s Board Members are a classic working board. This group of people, along with numerous chair-people, manage the behind-the-scenes workings of the organization. That means everything from finances and calendar of events to interfacing with the national organizer, outside clubs, advertisers, sponsors, and kickstarting many sub-committees that make up the greater ORPCA organization. They are the hands that guide the other teams and committees and try to stay in the background. 

While I have not listed the names of everyone on the above teams, the list is long. I want to thank the entire unnamed list of people for their efforts, commitment and sense of fun for all that they do. I hope you thank them too! I know that after many events, some people will drop a short line of thanks to the organizer. You may not realize how good that makes them feel, but trust me, a little thanks goes a long way. If you enjoyed reading an article, had a good time on a drive or one of our multi-day tours, please give a nod and a thumbs-up to the organizers and volunteers who made it happen. It’s your club and it is 100% volunteer run.

Let’s Drive!

You can reach me at [email protected]