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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-19
The Clutch of Competence
Vehicle-specific for the Porsche 911 RSR-19 (991.2, 2019–2023): the SACHS RCC 3/140 carbon racing clutch delivers maximum track performance with minimal diameter and low moment of inertia – precisely matched to the 4.2-L naturally aspirated flat-six in mid-engine layout and the 6-speed sequential racing gearbox of the LMGTE/GTLM works package.
ZF Race Engineering transfers top-tier technology from Formula 1, Super GT and WRC to GTE applications. Focus: lowest rotating mass, rapid engine-speed matching and high thermal stability – for consistent, repeatable performance across qualifying, stints and pit-stop cycles in WEC, ELMS and IMSA.
The 140-mm triple-plate carbon configuration offers high torque density with a low stack height. This supports precise launches, short shift windows and a finely controllable pedal feel – ideal for BoP-regulated LMGTE competition with 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-19
(991.2, 2019–2023) - Max engine torque [Nm]: 1,000
- 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)
Forged high-strength aluminum engineered for maximum stiffness at minimal weight. Geometry promotes efficient heat dissipation and stabilizes clutch-pack temperatures; a hard, wear-resistant coating reduces friction and fretting wear.
Material: carbon
Carbon delivers high temperature capability, stable friction over a wide operating window and a progressive, easily meterable response even at elevated disc temperatures. Low density reduces rotating mass and supports short shift times.
Hub spline
Supplied with the correct spline for the 911 RSR-19 input shaft – precisely matched to Porsche’s 6-speed racing gearbox for perfect fit, reliable torque transfer and long service life in endurance operation.
Scope of delivery
RCC 140 clutch cover (HA140), aluminum
3 × carbon driven plates (RCC 140)
4 × carbon pressure plates (RCC 140)
1 × hub (vehicle-specific spline for 911 RSR-19)
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, European Le Mans Series (LMGTE) – factory and customer programs 2019–2023.
North America
IMSA WeatherTech (GTLM): debut at 24h Daytona 2020, victories incl. Sebring and Petit Le Mans; fielded by works and customer teams.
Asia / Middle East
WEC rounds at Fuji, Shanghai, Bahrain and more; GTE programs until the end of the LMGTE era in 2023.
Partners of ZF Race Engineering
