Cayenne Turbo Specs: Motor: 4.-liter twin-turbo V8, 541 hp and 568 lb-ft of torque / Transmission: 8-velocity computerized / Prime Pace: 177 mph/ Floor clearance: 9.6 inches (air suspension, superior degree) / -60: 3.7 seconds / Tow rating: 7,700 lbs . /Foundation price tag: $126,500
The white calipers are a baller move.
Porsche’s new Surface Coated Brake method uses white calipers, a nod to the actuality that the mirror-complete tungsten carbide-coated rotors considerably reduce brake dust. You will find typically a compromise in between brake pad functionality and brake dust (significant-effectiveness pads have a tendency to deliver a lot more schmutz on your wheels) but which is not the only reason Porsche bothers to zap rotors with substantial velocity oxygen gasoline, a course of action that seems to be like an really a person-sided lightsaber fight.
PSCBs give some other bennies, which is important considering that they are a $3,490 alternative on the Cayenne S, however they are Normal on the Cayenne Turbo.
On the monitor or through tricky driving—given that we’re conversing Cayennes, trailering could be pertinent, too—a system with iron rotors is likely to knowledge some brake fade as the rotors heat up. Through tests, Porsche executed brutal large-speed stops that took both equally iron rotors and floor-coated rotors up to nearly 1,200 degrees Fahrenheit.
Around the program of 13 stops, they calculated the improve in pedal force demanded to haul down the car or truck, and though both equally methods expected a firmer squeeze of the pedal, the PSCB rotors only seasoned fifty percent as a lot fade as the iron brakes. Fun fact: on the Vickers hardness test, iron has a value of about 30 to 80 HV. Tungsten carbide is above 1,000 HV, which is why it truly is so well-liked for drill bits.
As for the PSCB’s absence of fade, that since of the one of a kind interplay amongst the glass-sleek rotors and the specially formulated pads. Since the rotors are so sleek, the pads effectively apply much more area region to the rotor than they would with an iron disc. And underneath substantial braking pressure, the pads dig into the rotor floor like a microscopic hook-and-loop fastener—abrading the rotor and generating some dust, but offering enormous stopping power, also.
Relying on how you drive, Porsche suggests PSCB makes 90 percent less brake dust and your rotors must last 30 p.c for a longer time. And, as expensive as it is, the PSCB choice is even now about a third the expense of the carbon-ceramic set up. As with the carbon brakes, you get 10-piston entrance calipers and 4-piston rears. Also like the carbon brakes: no rust on your rotors—ever.
So why not just make the complete disc out of tungsten carbide? Effectively, simply because individuals rotors would make carbon ceramics look inexpensive. So rather, Porsche made a three-aspect process to implement a 100-micrometer thick layer of tungsten carbide to an iron disc. The core of the rotor is thermally dealt with and roughed up with a laser to encourage bonding with the galvanically utilized intermediate layer—think of it as making use of primer prior to you paint a wall.
Then arrives the primary party, the superior velocity oxygen gas spraying system, in which tungsten carbide particles are fired at the disc at supersonic speeds. And indeed, that seems as amazing as you would expect. The mirror end comes after about 4,000 miles of driving, since the approach is dependent on the pads sharpening the rotors.
When the PSCB system is certainly heroic on a observe, I would warning the significantly less hardcore Porsche lovers out there to consider a push prior to checking that unique choice box. That is simply because the floor-coated brakes, with their enormous calipers and tremendous-grippy pads, virtually sense like they provide extra halting electric power than you can use in ordinary driving. All-around town, you discover to go mild on the brake pedal, lest all loose objects in the car acquire a fast vacation towards the windshield and footwells. You get utilised to modulating the pedal in a different way than you would in a car with iron, or even carbon ceramic, rotors.
Right now PSCB is obtainable on the Cayenne only. Depending on how the method is obtained, possibly shiny tungsten rotors will come across their way in other places in the lineup. I bet a 911 would appear great with white calipers.