Single Mass Flywheel

Introducing the ECS Tuning RA4 Single Mass Lightweight Flywheel, engineered in the U.S. by our leading R&D team for increased power transfer, faster revs, and improved acceleration while providing a smooth and easy clutch engagement. A decreased mass means a lower moment of inertia and, weighing in at only 14 pounds, the ECS single mass flywheel spins up faster and easier than the 23.6 pound flywheel installed from the factory. 

But light doesn't mean wimpy. Our precision CNC machined single mass flywheel is amazingly strong and tough enough to handle a performance clutch package and was subjected to long-term performance and durability testing in-house. Designed to accommodate all conditions: from Sunday drives through the country, to the abuse of the track. No matter your driving style or ability, this is the flywheel for you.

Key Features:

• Billet Chromoly 4140 Steel for superior strength and durability
  • Heat treated for wear resistance
  • Black Zinc plated for corrosion resistance
• Weighs in at only 14lbs!
  • 9.6lbs lighter than stock!
• Precision balanced for smooth running and idle quality
• Designed for use with B7 RS4 pressure plates and clutch discs for an OE-type fit
• SFI 1.1 tested and certified to ensure safe operation*
• Performance Benefits
  • Faster revs
  • Improved throttle response
  • Perfect rev matching for crisper shifts
  • Smooth and easy stock-like engagement
  • Improved acceleration
  • Sportier driving experience
• Allows you to utilize any clutch kit compatible with the B7 RS4 

Kit includes:

• ECS RA4 Single Mass Flywheel
• Pilot Bearing
• Flywheel Securing Hardware

Stronger and tougher than the original. If performance is job one on your to-do list, ECS Tuning flywheel kits deliver.

This kit does not include a clutch kit, allowing you to choose a clutch option that best suits your needs. This flywheel was designed to work with 240mm B7 RS4 clutch options only.

*Why is SFI testing and certification important?

The SFI Foundation, Inc. (SFI) is a non-profit organization established to issue and administer standards for the quality assurance of specialty performance and racing equipment. SFI certification indicates a flywheel has been certified using industry-standard SFI Spec 1.1 standards by an independent testing body to ensure quality of both design and materials for flywheels utilized in competitive motorsports. This testing requires that the flywheel must hold at 10,200RPM over an extended period of time for validation of durability, design, and construction. 

Having successfully passed SFI certification, this flywheel has an individual SFI serial number found in a laser etching, and on an affixed sticker. This certification means our ECS-engineered flywheel is safe and reliable during the rigors of competitive racing; it's also safe and reliable for years and years of street use.