Project NSX: Part 7 – Installing PFC Multi-Pad Monobloc Calipers

Performance Friction Multi-Pad Monobloc Caliper for Acura NSX

When the FX Motorsports Development Time Attack NSX team (that I drove for) was looking for a competitive edge, they turned to PFC to design a braking application for the already record-breaking car.  PFC analyzed braking data from the ABS-less Time Attack car and the brake bias from the three different OEM NSX brake packages that were used over the years to develop this 14” brake package that utilizes their ZR31 multi-pad caliper, a street version of their Champ Car caliper.

FX Motorsports Development NSX Billy Johnson PFC Brakes

The FXMD NSX was one of the least modified Unlimited-class cars ever.  This car always used the stock suspension control arms, mounting points, 5-speed transmission, and brake booster. Optimizing the brake bias in the calipers was crucial since the car could not quickly and easily change brake bias from a dual master cylinder racing system that many of our competitors had. 14” rotors were also a requirement when most of the options for the NSX were 13”.

After all of their calculations, PFC came up with a 59.5% front bias that is 15% more powerful than the NSX-R.  For reference:

Front Brake Bias % – Brake System
64.7% – 13” Brembo Lotus front & 1991-1996 rear
63.3% – 11.1” Spoon front & 1991-1996 rear
62.4% – 13” Stoptech front & rear
62.2% – 13” Stoptech front & 1991-1996 rear
60.3% – OEM 1991-1996 NSX
59.5% – 14” PFC front & rear
56.6% – 11.73” Spoon front & 1997+ rear
56.4% – 13” Brembo Lotus font & 1997+ rear
55.0% – 13” F50 front & 13” Lotus rear (old FXMD setup, with rear proportioning valve closed off for more F bias).
53.8% – 13” Stoptech front & 1997+ rear
53.4% – OEM 2002 NSX-R
52.2% – OEM 1997+ NSX
50% – 13” Lotus front & rear

Note: There is a big jump rearward in brake bias in 1997, which coincides with a new ABS modulator and accumulator that likely has an integrated proportioning valve to limit pressure to the rear calipers. In 2000, the new style ABS module utilizes an external proportioning valve.

Performance Friction Multi-Pad Monobloc Caliper on FXMD NSX

FX Motorsports Development went on to set records across the country with this newly developed brake package.  Some of which are still standing to this day, 11 years later.

For the install, we turned to NSX expert technician Nick Eustache of Applied Motorsports in Vista, California.  Nick is one of the few remaining NSX-certified technicians with two decades of NSX experience.  He was responsible for building all of the stock 5-speed transmissions (with OS Giken LSDs) for FXMD’s record-breaking NSX in addition to building motors, designing supercharger kits, and track prep work for NSXs.

Performance Friction calipers arrive wrapped in these fancy bags that make you feel like you’re putting a pair of Louis Vuittons on your car.  In some ways, that’s kind of true as they are jewels to behold.

8 comments

  1. OK, that’s just lovely. Wish the multipad stuff was more commonplace but even the “budget” ZR34/ZR94 calipers look pretty nice.

  2. Any idea if the NSX ABS module is similar to the S2k stuff? I am kicking around adding the S2k ABS system to my 240sx as it is a self contained standalone setup. Would be nice to go from no ABS to something more modern and workable.

    1. It’s somewhat similar. The programming is different and there are some hardware differences. People have used it on the NSX but I do not how know it performs vs a system designed for the NSX, however for your application it may be a better option.

  3. I had no idea individual pads were so rare in the automotive world. In the motorcycle industry, lots of even stock calipers use 4 individual pads.

  4. Neat. A lot of new information in this thread. I am one of those people who thought PFC was left only for those in NASCAR circles etc. I have a 328mm Stoptech ST40 kit behind 18″ TE37s. I thought they were cool (just like Milhouse’s mom), but you said otherwise.

    1. They’ve been in formula cars, prototypes, and sportscars for decades. I never said anything bad about StopTech. They are a great product at a great price point and put far more engineering and focus on brake bias for each application than their competitors.

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