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Description
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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 Racing Clutch
Porsche 911 GT3 Cup
Sintered metallic 3.4 mm, triple-plate – vehicle-specific for Porsche 911 GT3 Cup (991.1 2013–2016 / 991.2 2017–2020)
Developed for the Porsche 911 GT3 Cup (991): the SACHS RCS 3/140 S3.4 uses a compact Ø 140 mm friction diameter and three plates to achieve a low moment of inertia and very direct response – ideal for launch and shift demands of the 991.1 (3.8 L, approx. 460 hp) and 991.2 (4.0 L, 485 hp/480 Nm) with 6-speed sequential gearbox.
The 3.4 mm sintered metallic lining is engineered for durability and thermal stability in one-make sprint races and long stints. Versus 2.6 mm it offers more thermal reserve; versus 5.2 mm it keeps rotating mass lower and recovers heat faster – the bite point remains consistent over many starts and stints.
Rated up to 1,430 Nm. The forged aluminum clutch cover (housing) combines high stiffness with minimal package; high-strength steel pressure/intermediate plates ensure launch and endurance strength – matched to the 991 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.
Technology
RCS 3/140 – Technical data
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Vehicle:
Porsche 911 GT3 Cup 991.1 (2013–2016)
Porsche 911 GT3 Cup 991.2 (2017–2020) - Maximum engine torque [Nm]: 1,430
- Release diameter [mm]: 38
- Release force [N]: 4,200
- Release travel [mm]: 4.5 + 0.5
- Mass (weight) [kg]: 2.915
- Moment of inertia [kg·m²]: 0.00917
Clutch cover (housing)
Forged aluminum for maximum stiffness in a compact package. Geometry promotes heat dissipation and stabilizes clutch pack temperatures – proven for continuous 991 Cup use.
Friction lining
Sintered metallic lining provides high temperature capability, stable friction and fade resistance in dry high-load operation. 3.4 mm balances thermal buffer, life and low rotating mass – ideal for repeated starts, pit stops and tight shift windows.
Hub spline profile
Delivered with the correct spline for the Porsche 991 GT3 Cup input shaft (e.g. G91/70 sequential). Ensures perfect fit, reliable torque transfer and maximum durability.
Scope of delivery
RCS 140 clutch cover (HA140), aluminum
1 × RCS 140 pressure plate (PP140), steel
2 × RCS 140 intermediate plate (IP140), steel
3 × RCS 140 clutch disc, sintered 3.4
Hub length: vehicle-specific (991 Cup)
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), Carrera Cup Germany/France/Italia/Benelux/Scandinavia; plus NLS/VLN Cup classes and national endurance formats for one-make cars.
North & South America
Porsche GT3 Cup Challenge USA/Canada (later Carrera Cup North America), Carrera Cup Brazil; appearances at IMSA events and regional Cup series.
Asia / Pacific / Middle East
Carrera Cup Asia, Japan, Australia and Carrera Cup Middle East – active across the 991.1/991.2 era.
Partners of ZF Race Engineering
