Porterfield R4 (and R4s) Race Compound Brake Pads

Been a while but I will update here also. While I liked the R4s pads I had them in for about a week with great feel and normal dust and no noise. The next weekend we went to a HPDE at Road America on Sat. Then AutoX on the Kart track there on Sunday. Sat. was a total of 3 twenty minute sessions on the full 4+ mile track with the last session being closer to 30 minutes. And Sunday's event was 7 runs on the AutoX course. The car was trailered there and back so no hiway wear was incurred. When I swapped out the track wheels on Monday I found the rear brake pads down to less than 1/16th inch pad left on the drivers side and 1/8th inch passengers side left. Mind you only one weeks minimal driving on these great street pads. Now RA is a big track with a reputation of eating brakes on cars. I was stunned that the rears were gone and the fronts looked like new almost. Only thing we think it could be was Torque Vectoring as I had ESC in Full Off every run.. Other than that the pads and the car are great fun.

Hmm, here's the press release on the 2012 Focus and Torque Vectoring. It states drive wheels only modulation.

Ford Technology Allows New Ford Focus to Carve Through Turns Like a Downhill Skier

• The all-new 2012 Ford Focus features standard torque vectoring control to increase vehicle stability in turns by applying slight braking force to one side
• Torque vectoring control is a Focus class-exclusive feature that serves as a confidence-builder for novice drivers, while pleasing enthusiasts with added control when cornering
• Torque vectoring control provides stabilizing braking force to an individual drive wheel in a similar way that a skier or board-rider would shift weight to carving edge when turning

The all-new 2012 Ford Focus is the first beneficiary of a new class-exclusive Ford technology that employs downhill skiing and snowboarding moves to increase vehicle stability in turns.
Engineered to increase novice driver confidence by adding a finer sense of control in curves, the next-generation Focus will please enthusiast drivers as well with the addition of a vehicle stability control system previously reserved for premium sports cars.
"The new Focus is the first North American Ford vehicle to offer torque vectoring control," said Rick Bolt, program manager for the Ford Focus "This is a technology that has been offered on high-end sports cars, yet Ford is making it standard on their new small car."
Just as a downhill skier or board rider shifts weight to their outside edge in transition from schuss to edge– adding balance and stability to carve through a turn – torque vectoring control provides slight braking force to the wheel and the tire that is subject to potential slippage to help the driver and vehicle gracefully negotiate the curve.
The slight braking pressure applied to just one driven wheel is imperceptible to the driver. The behind-the-wheel experience is an improved sense of stability and control throughout the curve. This increased vehicle stability in cornering situations is sure to please enthusiast drivers yet serves as a confidence builder for novice drivers as well.
Torque vectoring control uses the Focus braking system to imitate the effect of limited-slip differential, constantly balancing the distribution of engine output between the driven front wheels to suit driving conditions and road surface. When accelerating through a tight corner, the system applies an imperceptible degree of braking to the inside front wheel, so that more engine torque goes to the outside wheel, providing additional traction, better grip and improved vehicle handling.
The system is designed to delight experienced and enthusiastic drivers but also to provide less- experienced drivers with confidence and a better sense of vehicle control, especially in difficult driving conditions.
"Torque vectoring control elevates the dynamic capability of the entire Focus model range, from an S series sedan through a Titanium Sport Package hatchback," said Bolt, an automotive enthusiast, frequent road course track-day participant, instructor, former Sports Car Club of America racer and – not surprisingly – downhill skier.
"Because torque vectoring control is on all our Focus models, it will elevate skill sets across a broad range of drivers," Bolt said. "The new Focus is differentiated from other vehicles in the segment by style and design, the technology it contains and the superior driving experience it provides."
The all-new 2012 Ford Focus goes on sale in early 2011.

That is interesting. While the Focus and Fiesta ST both have TVC, there are known differences (I've read that the FiST is a 2nd generation system, tuned differently, but that alone doesn't explain anything).

Keep in mind "all new...early 2011" in the above is talking about the first year of the FoST. That aside, I'm inclined to believe the electronics are more alike than not.

Perhaps this really is the case, but other sources say "front and rear wheel" as in this current 3rd party AutoGuide review (FiST v. BRZ):

(this snippet here)



I'll dig further into this. I know that I don't want it any form for my track car!