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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 motorsport clutch
Porsche 911 GT3 R / RSR 4.0
The Clutch of Competence
Vehicle-specific for the Porsche 997 platform: This SACHS RCC 3/140 carbon motorsport clutch incl. flywheel and motorsport concentric slave cylinder is precisely matched to the 911 GT3 RSR 4.0 (2009–2012) and the 911 GT3 R 4.0 (2010–2012). Minimal diameter (Ø 140 mm) and very low rotational inertia deliver instant engine response, short shift windows and precise launches – ideal for GT2/LMGTE endurance (RSR) and FIA GT3 sprint/endurance (GT3 R).
ZF Race Engineering transfers cutting-edge technology from Formula 1, Super GT and WRC to the 997 GT application. Focus: lowest rotating mass, temperature-stable friction levels and repeatable pedal feel over many race starts, pit stop cycles and long stints.
The three-plate carbon design provides high torque density with a low overall height – perfectly tuned to the 4.0-L naturally aspirated flat-six (RSR/GT3 R) with 6-speed sequential gearbox (dog-type/transaxle).
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).
The technology
Technical data RCC 3/140
-
Vehicles:
Porsche 997 GT3 RSR 4.0 (2009–2012)
Porsche 997 GT3 R 4.0 (2010–2012) - Engine / drivetrain: 4.0 L naturally aspirated flat-six
- Gearbox: 6-speed sequential (dog-type/transaxle)
- Max. 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
- Inertia [kg·m²] : 0.00687
Clutch housing
High-strength forged aluminium – maximum stiffness at minimal weight. The housing geometry aids heat dissipation and keeps the clutch pack’s temperature window stable – essential for GT endurance loads and repeated race starts.
Material: carbon
Carbon provides high temperature resistance, consistent friction and a progressive, easily controllable response even at high disc temperatures. The low density reduces drag losses and supports short shift times – an advantage in GT2/LMGTE and GT3.
Hub profile
Delivered to fit the input shaft of the respective 997 variant (RSR GT2/LMGTE or GT3 R). This ensures maximum fit accuracy, reliable torque transfer and long service life in racing use.
Concentric slave cylinder (CSC)
The motorsport CSC specifically designed for SACHS RCS/RCC reduces pedal forces thanks to its larger hydraulic volume. A one-piece, high-strength housing minimises leakage risk; bearings and seal systems are optimised for racing speeds. Actuation diameter matched to RCC/RCS: Ø 38 mm.
Scope of supply
RCC 140 clutch housing (HA140), aluminium
3 × carbon driven plates (RCC 140)
4 × carbon pressure plates (RCC 140)
1 × hub for 997 RSR / 997 GT3 R
1 × base plate (RCC 140), steel
1 × pressure ring (RCC 140), steel
1 × lightweight single-mass steel flywheel
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-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
Porsche 997 GT3 RSR 4.0 (GT2/LMGTE)
24h Le Mans (GT2/LMGTE), FIA WEC/Le Mans Series/ELMS (GT class), ALMS GT2, International GT Open as well as major endurance races (incl. Nürburgring, Spa).
Porsche 997 GT3 R 4.0 (GT3)
FIA GT3 series (FIA GT3, Blancpain/GT World Challenge), ADAC GT Masters, British GT, GT Open, NLS & 24h Nürburgring (SP9/GT3) as well as other national/regional GT3 championships in Europe, Asia and selectively the Americas.
Partners of ZF Race Engineering
