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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 992 GT3 Cup
Sintered metal 3.4 mm, triple-plate – vehicle-specific for the 992 GT3 Cup
Vehicle-specific for the Porsche 911 GT3 Cup (992, model year 2021 onwards): the SACHS RCS 3/140 S3.4 uses the compact Ø 140 mm and three friction discs for a very low moment of inertia and direct response – precisely matched to the 4.0-liter flat-six (approx. 510 hp / ~470 Nm) and Porsche’s 6-speed paddle-shifted dog-type sequential gearbox.
The 3.4-mm sintered lining is designed for sprint and long-stint loads in one-make cups: more thermal reserve than 2.6-mm while keeping rotating mass low. This stabilises bite point and modulation over many race starts, pit stops and tight shift windows.
The setup transmits up to 1,450 Nm. A forged aluminium housing minimises package size and mass; high-strength steel pressure/intermediate plates ensure launch and durability performance in tough Cup use.
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 992 (from 2021) - Max. 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
- Moment of inertia [kg·m²] : 0.00917
Clutch housing
High-strength forged aluminium, engineered for maximum stiffness with minimal package size. The geometry aids heat dissipation and stabilises the clutch pack’s temperature window; a hard wear-resistant coating reduces friction and fretting wear.
Friction material
Sintered metal provides high temperature capability, stable friction and fade resistance in dry high-load operation. At 3.4 mm it hits the best-of-both-worlds compromise: noticeably more thermal buffer and life than 2.6 mm, lower inertia than 5.2 mm – ideal for Cup sprints and long stints.
Hub spline
Supplied exactly matched to the input shaft of the 992 GT3 Cup gearbox. Ensures maximum fit accuracy, reliable torque transfer and durability.
Scope of supply
RCS 140 clutch cover (HA140), aluminium
1 × RCS 140 pressure plate (PP140), steel
2 × RCS 140 intermediate plate (IP140), steel
3 × RCS 140 driven plate, sintered 3.4
Hub length: vehicle-specific (992 GT3 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) – 992 since 2021; Carrera Cups (DE, FR, IT, Benelux, Scandinavia, GB, Middle East) plus Sports/Sprint Challenges.
North & South America
Carrera Cup North America (since 2021), Carrera Cup Brasil/México as well as regional GT3 Cup formats with 992 class.
Asia / Pacific
Carrera Cup Asia, Japan, Australia plus Sprint Challenges – 992 Cup as the top car from 2021/22.
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