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Description
Manufacturer
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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 992 GT3 Cup
Sintered metal 3.4 mm, triple-plate – vehicle-specific for 992 GT3 Cup (4.0 L / ≈ 510 hp)
Complete, vehicle-specific clutch module for the Porsche 911 GT3 Cup (992, from 2021): lightweight single-mass flywheel + RCS 3/140 motorsport clutch + motorsport concentric slave cylinder (CSC) – a matched system for maximum durability, precise launches and short shift windows.
The SACHS RCS 3/140 S3.4 combines a compact Ø 140 mm friction diameter with three plates for very low rotational inertia and direct response – ideal for the 4.0-L naturally aspirated flat-six (≈ 510 hp / ≈ 470 Nm) of the 992 Cup and the 6-speed sequential gearbox (dog-type, paddle shift).
The 3.4-mm sintered lining is designed for one-make sprint and long-stint use: more thermal reserve than 2.6-mm, lower rotating mass than 5.2-mm – the bite point stays consistent over many race starts. Since late 2020, around 1,130 units of the 992 Cup generation have been produced – the most widespread Cup model to date.
The design transmits up to 1,450 Nm. The forged aluminium housing offers high stiffness with minimal package space; pressure and intermediate plates made of high-strength steel ensure launch and endurance strength – precisely matched to the 992 Cup platform.
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
-
Vehicle:
Porsche 911 GT3 Cup 992 (4.0 L, from 2021) - Maximum engine torque [Nm] : 1,450
- Release diameter [mm] : 38
- Release force [N] : 4,200
- Release travel [mm] : 4.5 + 0.5
- Mass (weight) [kg] : 2.915
- Inertia [kg·m²] : 0.00917
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 continuous use in the 992 Cup.
Friction lining
Sintered metal provides high temperature resistance, consistent friction and fade resistance in dry high-load use. 3.4 mm strikes the balanced mix of thermal buffer, service life and low rotating mass – ideal for repeated starts, pit stops and tight shift windows in one-make racing.
Hub profile
Delivered to fit the input shaft of the Porsche 911 GT3 Cup 992 (transaxle, dog-type). This ensures highest accuracy of fit, reliable torque transfer and maximum durability in motorsport use.
Concentric slave cylinder (CSC)
The motorsport CSC specifically engineered for SACHS RCS/RCC reduces pedal effort thanks to increased hydraulic volume. A one-piece, high-strength housing minimises leakage risk; bearings and seals are optimised for racing speeds. 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 (992 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
Porsche Mobil 1 Supercup (F1 support, since 2021), Carrera Cup Germany/France/Italia/Benelux/Scandinavia/GB/Middle East; plus Porsche Sprint Challenge & Sports Cup (992-Cup classes).
North & South America
Porsche Carrera Cup North America (since 2021 exclusively 992 Cup) as well as further Carrera Cups and regional Cup/Challenge formats in North and South America.
Asia / Pacific / Middle East
Carrera Cup Asia, Japan, Australia as well as Porsche Sprint Challenge Asia/Middle East – 992 GT3 Cup as the top one-make platform.
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