140mm Tetra-Disc Clutch Kit & Flywheel for Porsche 991.1 GT3 Cup 3.8L (2013-2016) 

Kit Includes:

• 140mm / 5.5" 4-Disc Clutch Kit
• 140mm Flywheel, equivalent to Porsche Motorsport PN: 99710204192 / 997.102.041.92 / 997-102-041-92
• Flywheel Grooved Ball Bearing, equivalent to Porsche Motorsport part number: 93110211102
• Flywheel M10x1.25 Socket Head Screws (9 pcs, Grade 12.9), equivalent to Porsche Motorsport PN: 93010220600, but with a shorter head height for increased clearance with the bottom clutch disc.
• Clutch Disc Alignment Tool

Why Choose Our Ø140mm (5½") Four-Plate Clutch Kit?

✅Our 140mm Four-Plate Clutch Kit is essential for hill climb and rally racing, offering twice the lifespan of the Porsche Motorsport triple-disc clutch kit (ZF Sachs Racing).

✅Proven in High-Torque Applications – Used in 996, 997, 991, and 992 GT3 Cup hill climb & rally builds, as well as Audi R8 GT3 LMS hill climb setups producing over 550Nm of torque.

✅Engineered for Maximum Durability – Designed to withstand at least 800Nm, ensuring exceptional reliability under extreme conditions.

✅Optimized Performance & Control – With our precisely tuned diaphragm and component tolerances, along with our specially developed sintered friction blend, we enhance driver control and pedal feel, allowing for smoother, quicker, and more precise launches. This results in improved start-line performance in hill climb races and rallies, ensuring faster engagement with reduced effort.

✅Ultra-Lightweight Design – The entire clutch kit weighs only 3.93 kg (excluding bolts)

Clutch Kit – Component Features

4-Plate 140mm Clutch Cover

✅Material: Forged 6061-T6 aluminum with Electroless Plating Coating for:

• Enhanced hardness & wear resistance
• Improved corrosion resistance
  

✅Clutch cover legs are equipped with metal rivets for increased durability.

✅ Chromium-vanadium alloy steel diaphragm, with a special heat treatment, offers superior strength, elasticity, heat resistance, and excellent wear resistance.

Top/Pressure Plate

✅Material: Forged chromoly steel, ensuring maximum performance and longevity.
✅Cryogenic treatment for increased strength and durability under high loads.

Clutch Discs

✅Sintered friction material with our proprietary blend of sintered metal compounds.
✅Optimized for:

• Exceptional durability & heat resistance
• High torque capacity

✅Custom spline options available upon request.

Flywheel Design & Key Improvements

Our flywheel retains the same dimensions and weight (2.95kg) as the Porsche Motorsport flywheel (PN: 99710204192 / 997.102.041.92 / 997-102-041-92) but features several significant upgrades:

✅ One-Piece Design with Integral Ring Gear – Far more reliable than the Porsche Motorsport / Sachs Racing two-piece bolt-on ring gear system.
✅ High-Strength Forged Chromoly Steel (CrMo) – Special nitriding heat treatment delivers a 60 HRC surface hardness (twice as hard as the OEM Porsche Motorsport flywheel).
✅ Superior Durability & Longevity – Increased resistance to wear, deformation, and heat-related fatigue.

Applications

✅Porsche 991.1 GT3 Cup 3.8L (2013-2016)