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Has anyone had their rotors silver cadmium plated to eliminate the rust? It will wear off the friction surface quickly but the internal surfaces will no longer rust and sling brown stains arouns the inside of my nice clean wheels. I see this plating all over the place int he aftermarket - but not on any Porsche sites I've visited. Any clues for the clue-less?
Well, the coating would add weight and possibly reduce cooling.
Greg Kable reports in Autoweek November 13 that a German Auto Manufacturer will offer Electronic Wedge Brakes [EWB] in 2008. These brakes, produced by Siemens, will stop in half the distance of hydraulic brakes. Imagine the G-forces these clampers would have at 160 mph!
I read that article today, and I'm kind of confused. At one point they say,
"In tests, a prototype with the wedge brakes regularly required less than half the distance to come to a complete stop than the prototype with the standard brakes, a company official said."
HALF the distance??? I thought tires would be the limiting factor a lot quicker than that.
Also... whenever I hear about a technology like this, I wonder why the guys in F1 aren't using it? If somehow, they didn't 'know' about it, can I COUNT on seeing it in F1 next year. I mean -- HALF the distance! Your team instantly dominates.
I read that article today, and I'm kind of confused. At one point they say,
"In tests, a prototype with the wedge brakes regularly required less than half the distance to come to a complete stop than the prototype with the standard brakes, a company official said."
HALF the distance??? I thought tires would be the limiting factor a lot quicker than that.
Also... whenever I hear about a technology like this, I wonder why the guys in F1 aren't using it? If somehow, they didn't 'know' about it, can I COUNT on seeing it in F1 next year. I mean -- HALF the distance! Your team instantly dominates.
Same thought, if these are so amazing why don't we see them in F1, but then the rules might need to be changed to allow these stoppers. The other thought I had was how do these brakes feel while driving? Say I tap the brakes and suddenly I am going through the windshield..just before the guy behind me rear-ends me. How good would that be? Then there is M-B's experiment with E-brakes. On a drive to San Diego these e-brakes drove me nuts, I was afraid to use them for fear of what might happen at So-Cal highway speeds.
This is an interesting innovation and it will certainly be interesting to watch it develop and evolve. But I don't see it becoming main stream any time soon.
Here are my concerns:
1. What about pedal feel? The visceral experience of a Porsche will loose an important component, the feedback you can feel from the brake pedal. These electrically operated brakes will provide as much pedal feel as your 'drive by wire' accelerator pedal does, none.
2. What about reliability? You can read about all sorts of electrical failures including check engine lights, PASM failures, PSM failures, ABS failures and so on. Though you can still limp home or to a dealer with most of these, what happens if your electric brakes or accompanying control units fail? You're toast. I like the old school mechanical reliability of a hydraulic brake system. Every system in the car can fail and those brakes will still work.
3. If this braking system is so great, why aren't we seeing it in use in other areas first, like on race cars (as pointed out), airplanes and trains?
4. Do we really need an improvement in brakes? I am finding it hard to believe that this can reduce a Cayman's braking distance by 50%. With today's good braking systems, it seems stopping distance becomes a product of traction more than anything.
Perhaps in time they can solve these issues, but you wouldn't catch me being their guinea pig until I see real world performance and reliability.
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
By biggest concern with cad plating would be the material transfer going on as it wears off the friction surface. Sounds like a great way to really mess up the interface to me.
as for e-brakes, you won't find them in racing for a very long time until they can work out the ability to modulate and feel them. The best thing about hydraulic is that its a direct connection foot to pad that you can feel and which eventually becomes a direct extension of your nervous system...your brain forgets about all the stuff inbetween it and the tires and it just does what it needs to do to put you at the right speed at the right spot (one hopes) on instinct...put a computer in the middle that interprets what it thinks you intended and you f everything up. The weak link in modern racing brake systems is not the hydraulics...however. Its materials and thats is still what is holding even e-brakes back.
here is a good video showing how they work, and a good SAE white paper from the on them too.
If anybody really wants deeper details I also havea copy of the original patent filed by eStop, the company that siemans bought to acquire this technology for the eWheel project.
Silver Cadmium plated rotors?
Linear Mode
