BMW S54 Steel 8.5in Flywheel

Tilton Engineering Steel Flywheel – BMW S54

Larger diameter. Greater inertia. Real-world drivability.

Upgrade your BMW S54 engine with Tilton Engineering’s 12lb steel flywheel—a purpose-built solution that balances performance and drivability. With a larger diameter than the OEM flywheel, this unit delivers increased rotational inertia for smoother power delivery and more predictable clutch engagement.

Whether you’re building a responsive street car, a track-day machine that still needs to idle cleanly, or a high-torque boosted setup, this flywheel gives you the low-RPM stability and traction-friendly behavior lightweight race flywheels can't match.

Why It Works for the S54:

• Greater Rotational Inertia
  The larger diameter and steel mass help the engine maintain RPMs during shifts, launches, and low-speed driving—reducing the chance of stalling and making the car easier to drive in traffic or at the limit.
• Smooth and Predictable Power Delivery
  Engine pulses are dampened more effectively, leading to smoother throttle transitions and improved rear-wheel traction on exit.
• Real-World Friendly Clutch Engagement
  Compared to small-diameter 7.25” flywheels, this 8.5" version provides easier modulation and smoother engagement—ideal for dual-purpose builds.
• Steel Durability
  Built from high-strength steel, this flywheel resists warping and fatigue under high heat and repeated abuse—perfect for naturally aspirated or forced-induction S54s.

Best For:

• E46 M3 street and track builds
• High-compression or turbocharged S54s
• Drivers who want performance without sacrificing drivability