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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 Carbon Racing Clutch
Porsche 911 RSR 4.0
The Clutch of Competence
Vehicle-specific for the Porsche 911 RSR 4.0 (991, MY 2013–2016 and 2017–2019): the SACHS RCC 3/140 carbon racing clutch from ZF Motorsport delivers maximum race performance with a compact Ø 140 mm and a very low moment of inertia – precisely matched to the 4.0-liter naturally aspirated flat-six and the 6-speed sequential racing gearbox of the LMGTE/GTLM works kit.
ZF Race Engineering transfers cutting-edge technology from Formula 1, Super GT and WRC into the GTE application. Focus: lowest rotating mass, rapid speed matching and high thermal stability – for consistent, repeatable lap times across qualifying, stints and pit-stop cycles in WEC/IMSA.
The triple-plate carbon design offers high torque density at a low stack height. This supports precise launches, short shift windows and a finely controllable pedal feel – ideal for BoP-regulated LMGTE runs over long race distances.
Benefits
maximum thermal resilience - carbon quality from Formula 1
very low weight and minimal moment of inertia
smooth and comfortable launch behavior
no flywheel wear
extreme durability - up to 4x longer than conventional sintered racing clutches
Lowest mass
One of the major strengths of a carbon racing clutch is its low mass and the resulting low moment of inertia.
They are designed for the lowest possible mass with the goal of transferring engine torque to the gearbox as quickly and directly as possible.
Lightening measures in the cranktrain that reduce the moment of inertia increase vehicle acceleration noticeably in the lower gears.
Faster acceleration
If, for example, the clutch has a moment of inertia (Mtm) of 0,061 kgm2, with a gearbox ratio of 13,4:1 (first gear ratio) this acts at the drive wheel with 180 times the value (13,42). Converting Mtm into vehicle mass results in an additional weight of approx. 145 kg in 1st gear that must be accelerated.
Thanks to the extremely low inertia of the SACHS carbon clutch, shift times are significantly reduced and the vehicle accelerates faster.
Maximum service life
For carbon clutches there are pressure plate and shim packs available that compensate carbon wear. With these compensation pressure plates the clutch can be reset to as-new condition - significantly extending service life.
Each unit undergoes stringent quality checks and is individually tested and measured before shipment. Preload force, installation height and release characteristics are documented. The preinstalled carbon stack thickness is also recorded - the included document supports maintenance and the shimming process (compensation pressure plates for refurbishment).
Technology
RCC 3/140 – Technical data
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Vehicle:
Porsche 911 RSR 4.0
(991 – in service 2013–2016, 2017–2019) - Maximum engine torque [Nm]: 900
- Release diameter [mm]: 38
- Release force [N]: 4,800
- Release travel [mm]: 4.5 + 0.5
- Mass (weight) [kg]: 2.17
- Moment of inertia [kg·m²]: 0.00687
Clutch cover (housing)
High-strength forged aluminium, engineered for maximum stiffness at minimal weight. The geometry promotes heat dissipation and stabilises the clutch pack’s temperature window; a hard, wear-resistant coating reduces friction and fretting wear.
Material: carbon
In GTE use, carbon offers high temperature capability, stable friction over a wide operating window and a progressive, easily metered response even at elevated disc temperatures. Its low density reduces rotating mass and supports short shift times.
Hub spline profile
This RCC 3/140 carbon clutch is supplied with the exact spline to suit the Porsche 911 RSR 4.0 (991) – precisely matched to the input shaft of the Porsche 6-speed racing gearbox. The result is maximum fit accuracy, reliable torque transfer and high durability in endurance operation.
Scope of supply
RCC 140 clutch cover (HA140), aluminium
3 × carbon driven plates (RCC 140)
4 × carbon pressure plates (RCC 140)
1 × hub for 991 RSR 4.0
1 × base plate (RCC 140), steel
1 × pressure ring (RCC 140), steel
Quality Made in Germany
ZF Race Engineering has been among the technology leaders in motorsport for years. The combined know-how from top-tier racing flows directly into the development of carbon racing clutches. State-of-the-art manufacturing methods, the highest quality standards and motorsport technologies make carbon clutches the first choice for maximum performance and reliability - on circuit racing as well as in rally, formula and endurance applications.
Applications
Europe
FIA WEC (LMGTE Pro/Am) incl. 24h Le Mans – e.g. GTE-Pro 1-2 finish in 2013; ELMS entries by customer teams.
North America
ALMS/IMSA GTLM: incl. Daytona 24h class win 2014; entries at Sebring, Petit Le Mans, Watkins Glen and more.
Asia / Middle East
WEC rounds at Fuji, Shanghai, Bahrain as part of the GTE works programme.
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