English
Designed to make a
difference
ZF Race Engineering's SACHS motorsport clutches have stood for top-tier quality in international racing for decades. The ambition: continuous improvement and the drive to keep pushing the limits. From the lightest clutch used in Formula 1 to proven twin-plate and multi-plate systems in WRC, DTM, NASCAR, Le Mans and the Dakar Rally - ZF Motorsport technology is a core component of many winning cars worldwide.
SACHS motorsport clutch module
Porsche 911 Cup
Sintered metal 3.4 mm, triple-plate – vehicle-specific for 993 Cup 3.8, 996 GT3 Cup 3.6 and 997 GT3 Cup 3.6/3.8
Complete, vehicle-specific clutch module for the Porsche 911 Cup generations 993/996/997: lightweight single-mass flywheel + SACHS RCS 3/140 motorsport clutch + motorsport concentric slave cylinder (CSC) – a matched system for precise launches, short shift windows and maximum durability in sprint and endurance formats.
Proven weight advantage: only 6.43 kg for the complete module incl. flywheel (OE: 23.86 kg) – that’s −73% versus the production clutch. The drastically reduced rotating mass measurably improves throttle response, traction window and braking stability.
The RCS 3/140 S3.4 combines a Ø 140 mm friction diameter with three sintered plates for very low inertia and direct response – ideal for the 993 Cup 3.8 L (G50/30, manual), the 996 GT3 Cup 3.6 L and the 997 GT3 Cup 3.6/3.8 L (sequential/dog-type). The 3.4-mm lining offers more thermal reserve than 2.6-mm setups while keeping rotating mass low.
Advantages
Light
low clutch height
Low mass and inertia
Less Mass
One of the greatest strengths of the RCS sintered clutch is its low mass and the associated low mass inertia.
The SACHS RCS clutches have been designed for racing with the objective that torque is transmitted rapidly and directly from the engine to the gearbox.
Reducing the weight of the crankshaft drive to lower the moment of inertia will considerably increase vehicle acceleration performance in the lower gears.
Faster Acceleration
If the clutch itself has a moment of inertia (MoI) of 0.061 kgm2, the MoI on the drive wheel will be 180 times higher (in first gear) for a reduction in transmission of 13.4:1 (13.42). If we convert this value into vehicle mass, we arrive around 145 kg of additional weight to be accelerated in first gear.
As a result of the low moment of inertia of the SACHS RCS clutch, shifting times are considerably reduced and the vehicle accelerates much faster.
The technology
Technical data RCS 3/140
-
Vehicles:
Porsche 993 Cup 3.8 (1994–1998)
Porsche 996 GT3 Cup 3.6 (1998–2005)
Porsche 997 GT3 Cup 3.6/3.8 (2005–2013) - Max. engine torque [Nm]: 1,450
- Release diameter [mm]: 38
- Release force [N]: 4,200
- Release travel [mm]: 4.5 + 0.5
- Clutch unit mass [kg]: 2.915
- Inertia [kg·m²]: 0.00917
- System weight incl. flywheel [kg]:
6.43 (OE: 23.86 / saving: −73%)
Clutch housing
High-strength forged aluminium, designed for maximum stiffness with minimal package space. The geometry supports efficient heat dissipation and stabilises the clutch pack’s temperature window – suitable for air- and water-cooled Cup generations.
Friction lining
Sintered metal provides high temperature resistance, stable friction and fade resistance in dry high-load use. At 3.4 mm it is the sweet spot of thermal buffer, service life and low rotating mass – ideal for repeated starts, pit stops and tight shift windows in one-make cups.
Hub profile
Delivered to precisely fit the input shaft of the respective vehicle (993 Cup G50/30 manual, 996/997 GT3 Cup dog-type/sequential). Ensures highest accuracy of fit, reliable torque transfer and maximum durability.
Concentric slave cylinder (CSC)
The motorsport-specific CSC for SACHS RCS/RCC reduces pedal effort through increased hydraulic volume. One-piece high-strength housing minimises leakage risk; bearings and seals are optimised for racing rpm. Actuation diameter matched to RCS Ø 38 mm.
Scope of supply
RCS 140 clutch housing (HA140), aluminium
1 × RCS 140 pressure plate (PP140), steel
2 × RCS 140 intermediate plate (IP140), steel
3 × RCS 140 clutch plate, sintered 3.4
Hub length: vehicle-specific (911 Cup)
1 × lightweight single-mass flywheel, steel
1 × motorsport concentric slave cylinder (CSC)
Quality Made in Germany
ZF Race Engineering has been among the technology leaders in motorsport for years. The combined know-how from top-level racing flows directly into the development of RCS racing clutches. State-of-the-art manufacturing methods, the highest quality standards and motorsport technologies make ZF Motorsport clutches the first choice for maximum performance and reliability - on circuits as well as in rallying, touring and endurance racing.
Applications
Europe
993 Cup (Supercup/Carrera Cups from 1994), later VLN/NLS and historic Cup/GT series. 996 GT3 Cup: Supercup & national Carrera Cups (1998–2005), endurance (incl. Nürburgring). 997 GT3 Cup: Supercup/Carrera Cups (2005–2013), numerous GT and endurance formats across Europe.
North & South America
Entries in Porsche GT3 Cup Challenge / Carrera Cup North America (996/997), club and endurance racing (PCA, NASA, SCCA). 993 Cup now primarily in historic/vintage series and track days.
Asia / Pacific
Carrera Cup Asia/Japan/Australia (996/997). 993 Cup and 996/997 are now common in regional GT/club series, historic events and track days (Japan, Australia, New Zealand).
Partners of ZF Race Engineering
