02-19-2019, 01:21 PM | #1 |
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Porterfield R-4 Racing Compound for your BMW M2 Competition
R-4 Racing Compound
For over two decades, the Porterfield Carbon Kevlar brake pad has given racers abroad a definite world class friction material suitable for virtually any racing condition. Designed specifically for heavy duty motorsports, the Porterfield R-4 brake pad was our first and is our origi- nal Carbon Kevlar brake pad. Being able to maintain an average of a .50 friction level within a very wide temperature range gives the R-4 pad astounding versatility and makes it very suitable for a wide array of vari- ous track conditions. With use of the latest ceramic technology, the Carbon based semi- metallic R-4 materials allow the pads to absorb tremendous amounts of heat and dissipate it at a very even rate, while at the same time insulating excessive heat from calipers. Another inherent characteristic of our carbon kevlar material is how quickly the pads warm up to race temperature which is quite helpful during restarts, and when track time is limited. Optimum R-4 operating temperatures are 450oF and above. When used with cast iron and steel alloy rotors, the R-4 compound requires minimal bed-in period. Throughout the entire heat range, the Carbon Kevlar material will give extremely consistent modulation and predictability smooth release characteristics up to thresh- old. Another benefit of our R-4 compound is that even with the high friction levels and broad temperature ranges, the unique properties of our compound allows the rotors life to be extended to the maximum. This is truly the most rotor friendly racing brake pad material ever. Road courses, oval track, rally, vintage racing, autocross, club events or professional racing events. Tested and raced in countless types of competition ve- hicles, the R-4 compound from the outset has established its reputation as a Championship winning brake pad material. AP1648 APF-40 Application: F87 M2 Competition ***Please allow 7-10 business days of lead time*** $629.45 for 6 piston front and 4 piston rear set Order here: https://hpautosport.com/product/port...2-competition/ Last edited by HP Autosport; 07-28-2023 at 05:07 PM.. |
03-12-2019, 08:05 PM | #5 |
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These are my new favorite pad. They last a long time and bite well. I'll be ordering some for the M2C soon!!!
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2020 M2 Competition - Silver/6MT/Exec // 2019 Merc-AMG GLA45 // 2004 Audi TT 3.2 VR6 // 2015 Porsche Cayenne Diesel (off-road modded) //2007 Audi RS 4 (AWD/6MT/NA-V8!!!) // SOLD: 2017 AMG GLA45 //2018 034Motorsport Stg-2 E85 TT RS Nardo Grey // 2013 034Motorsport Stg-2 TT RS Suzuka Grey // 2013 034Motorsport Stg-2 (de)allroad(ed) Glacier White // 2007 Z4MC Space Grey/Red // 2006 Z4MC Imola Red/Black
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06-08-2019, 10:54 PM | #11 |
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Drives: 20 BMW M2C 17 Mazda MX-5 RF
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I've used R4's on three of my previous dual duty cars. E36M3, E46M3 & FRS.
What makes this pad so unique is its ability to work cold on the street w/o tearing up rotors. But also then being able to work a track temps as well. Only 2 other pad compounds I've run into work like this the Carbotech XP10's, 12's or higher and the Raybestos 43's. I'm a LFB and pad modulation and feel on these pads is outstanding
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