Turner Motorsport F8X S55/N55 Lightweight Single-Mass Flywheel

The OEM dual-mass flywheel found in S55-powered BMWs is engineered for comfort. It's design is aimed at dampening drivetrain vibrations, smoothing gear changes, and ensuring a driving experience that is on par with BMWs line of luxury vehicles. An unfortunate byproduct of this design is the rotational mass it introduces to the drivetrain—a hefty 26.5 lbs! This added inertia hinders throttle response, making it difficult to rev-match and perform efficient gear changes. Moreover, dual-mass flywheels are a known weak point in modified applications and can prove expensive to replace.

The Turner Motorsport Single-Mass Lightweight Flywheel Conversion for BMW S55 addresses all of these shortcomings with a purpose-built, lightweight, single-mass design that prioritizes performance. Weighing in at only 18.5 lbs.—nearly 10 lbs. lighter than stock—this design significantly reduces rotational mass, allowing your S55 to achieve its true motorsport potential!

FEATURES

• Precision machined from 4140 HT heat-treated chromoly steel for exceptional toughness, even wear properties, and increased durability.
  • Material quality promotes even wear across the entire friction surface, prolonging component lifespan.
  • Heat treated to HRC 28-32, tempered to relieve stress and improve dimensional stability.
  • Hardness improves component wear characteristics.
• Black oxide coated for corrosion resistance on non-friction surfaces.
• Precision balanced to exceed OEM specification (G16 spec to 175g-mm).
• SFI 1.1 certified to ensure safe operation under extreme operating conditions.
• Specifically designed to work with S55 OE-architecture clutches.
• Optimized step height maximizes clutch clamp load and offers a prolonged service life.

PERFORMANCE

• 10 lbs. lighter than the factory BMW flywheel!
  • OEM Dual-Mass: 26.5 lbs.
  • Turner Motorsport Single-Mass: 18.5 lbs.
• Faster revs
• Improved throttle response and acceleration
• Allows for a more engaging driving experience and delivers a feeling of direct connection

Replaces Genuine BMW Part Number: 21212283028

Installation:

Flywheel Hardware: For added peace of mind, apply Blue or Orange Loctite when installing factory flywheel bolts that do not come with pre-applied threadlocker.