MFactory 21 lb Lightweight Chromoly-Nitrided Single Mass Flywheel for BMW N54 135i/335i (E82 E88 E90 E91 E92 E93) 6-Bolt & 8-Bolt, Manual, OEM Clutch Compatible

MFactory lightened solid flywheel upgrade for BMW N54 135i and 335i manuals

Give your N54 turbo six the response it deserves. This precision-engineered MFactory solid flywheel replaces the heavy dual mass unit to deliver instant pick up, faster revs and stronger acceleration. At approximately 21 lb (about 9.5 kg), it cuts rotating inertia without compromising drivability, making it ideal for spirited road use, track days and drag runs. Designed to work with the factory clutch and pressure plate, it is a proven bolt-on drivetrain upgrade for E8x and E9x BMW 135i and 335i manual gearbox cars.

What you will feel

• Quicker throttle response and crisper rev matching for heel and toe
• Snappier gear changes with improved engine braking feel
• Smoother, more direct connection compared with a tired dual mass flywheel
• Reduced parasitic losses for a more eager, energetic power delivery

Engineering highlights

• Forged 4140 chromoly steel for exceptional strength and durability
• Nitrided surface for superior wear resistance and long service life
• CAD designed and FEA validated for optimal rigidity and reduced inertia
• Precision balanced to over 12,000 rpm for silky smooth operation
• Approx. 21 lb construction to slash rotating mass while retaining street manners
• Direct fit with stock-style clutch components for hassle-free installation

MFactory report typical driveline efficiency gains of around 1–2% versus rival components. Pair this lightweight unit with a suitable clutch and enjoy sharper rev matching, quicker spool and a more engaging drive from your BMW turbo straight-six.

Tested by MJ Modifications

We have installed and used these MFactory flywheels on our own cars and customer builds. Feedback is consistently excellent, with owners praising the improved responsiveness, slicker engagement and acceleration compared to ageing dual mass setups.

Recommended clutch pairing

For higher torque N54 builds, we recommend the SPEC BMW N54 Stage 3+ clutch which is designed to suit this MFactory flywheel. This combination is a popular, proven solution for tuned 135i and 335i manuals.

Fitment and part numbers

MF-TRS-09E92 (8-bolt crank)

• BMW 135i E82 and E88 2006 to 2008
• BMW 335i and 335ix E90, E91, E92, E93 2006 to 2008
• Manual transmission only

MF-TRS-09E92A (6-bolt crank)

• BMW 135i E82 and E88 2009 onwards
• BMW 335i and 335ix E90, E91, E92, E93 2009 onwards
• Manual transmission only

Key specifications

• Material: SAE 4140 forged chromoly steel
• Heat treatment: Forged, double tempered and super sub-zero treated for toughness
• Surface: Proprietary nitride hardening
• Balance: Precision balanced to 12,000+ rpm
• Weight: Approximately 21 lb (about 9.5 kg)
• Clutch compatibility: Works with OEM or OEM-style clutch kits

Professional installation

We strongly recommend expert fitting. Book with MJ Modifications in Warwickshire for supply and installation, plus guidance on the best clutch setup for your power goals. Request a quote at info@mjmodifications.co.uk.

Compatibility check

We will verify the correct 6-bolt or 8-bolt version before dispatch. Please provide your UK registration or the last 7 digits of your VIN at checkout so we can confirm fitment.

Warranty

MFactory Competition Products provide a limited 1 year warranty on Lightweight Flywheels covering defects in materials and workmanship, subject to professional installation.

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