Porterfield R4-1 DUAL PURPOSE Pad - MX5 Front
2006-2015
Street/Autocross/Track
PART NUMBER: 61-03331
DESCRIPTION
Set of 4 brake pads, fits all 2006 to 2013This high friction racing material has grown to be a very popular choice for drivers who need the highest possible friction with a low pad temperature. Developed and tested in the vintage racing community the R4-1 gives an average coefficient of friction of .56 with peak levels up to .600. Having tremendous stopping power, the R4-1 pad material can reach upwards of .5 friction level when pad temperature is a very low 200 F .
Drivers can still have a high friction brake pad without worry of the pad becoming too cold to be effective when the car is driven only moderately. For use when pad temperatures are under 600 F and peak temperatures are not over 1000 F. Widely used on Vintage GT and formula cars the R4-1 has gained great popularity as an excellent auto-cross, off-road and rally-cross pad material. Great modulation, consistent pedal feedback and the same rotor friendliness as our other carbon kevlar compounds.
BRIAN'S APPLICATION NOTES: I first drove on these in Vintage racing a Triumph TR4-A....which is the same weight as a Miata. I really liked the bite of these pads and they worked great at tracks like PIR. Finally decided to try them on our 2007 supercharged track and autocross MX5 and again the bite is great and they have low temperature performance that other race pads can't seem to deliver sufficient for use as your ONE choice for BOTH autocross and track. Expect a bit of squeal on cold morning for the first stop, after that they seem to have enough heat to work.
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Customer Reviews
Porterfield R4-1 DUAL PURPOSE Pad - MX5 Front
I totally agree with the other reviewer (J.A.). I track my car occasionally and these pads bite so hard and so good over OEM. Yes they squeal (not too bad), yes they leave your wheels dirty, but they are totally worth it.
I just installed my second pair of R4-1 pads on the front. Still have the first set on the rear. I REALLY like them. The coeff of friction is about twice that of common pads, so the brake torque is also about twice for a given pedal pressure. That makes them unusually touchy at 40 MPH and below and superb at 80 and up. They do not have a noticeable temperature curve, so you always have very powerful brakes, cold or not. I have never gotten the brakes hot enough to lose any brake torque during aggressive street driving. Running the roads near Fontana at MATG, never challenges my brakes.
They are very dusty and the dust is black. Trivial.
They are noisy, lots of squealing, again, trivial.
They don't last long, the first set lasted 16k miles on the front, the rears are about half worn. I installed them on EBC slotted rotors and that may have been the mistake that made them wear out so quickly.
They wear the discs aggressively, unlike the R4-Es and R4s I ran on my '87 Mustang GT autocross car.
Great pads, especially for a track/auto-x car, and very high performance for the street.
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