Supertech Uprated Conical (Tapered) Valve Spring Kit & Titanium Retainers for BMW N54 N55 S55 – Performance Valvetrain Upgrade | 135i 1M M135i M235i 335i 435i M2 M2C F80 M3 F82 M4 – Anti Valve Float High RPM – SPRK-FE20N54-BE

Uprated tapered valve spring set for BMW 3.0 turbo straight six engines with lightweight titanium retainers

Give your BMW forced-induction six the confidence it deserves at high revs and high boost. This beehive-profile spring package is engineered specifically for the N54B30, N55B30 and S55B30, delivering rock-solid valve control on tuned road cars, track builds and big turbo conversions. If you are pushing higher boost, extending the rev limit or chasing consistent power lap after lap, these springs help combat valve float and keep the valvetrain stable when it matters.

We have installed this kit on our own cars and for customer projects, and the results have been outstanding. Owners report cleaner top-end power, smoother pull to redline and peace of mind during hard use. The tapered spring architecture paired with titanium retainers trims mass, reduces resonance and supports reliable performance under demanding conditions.

Why this upgrade works

• Tapered beehive design improves spring dynamics and reduces harmonics for consistent valve control at elevated RPM.
• Titanium retainers cut valvetrain weight for quicker response and improved stability under load.
• Developed for boosted applications, single turbo and hybrid turbo builds seeking dependable high RPM behaviour.
• Trusted quality from a leading valvetrain specialist used by enthusiasts worldwide.

What you get in the box

• Single springs - 24 pcs. SPR-FE20N54-BE
• Titanium retainers - 12 pcs. RET-BMN54-TI (5 mm)
• Titanium retainers - 12 pcs. RET-BMN54-TE (6 mm)

Technical data

• Seat pressure: 75 lbs at 36.50 mm
• Open pressure: 155 lbs at 10.00 mm lift
• Coil bind: 23.20 mm
• Maximum lift: 12 mm
• Rate: 8 lbs per mm
• Wide end outer diameter: 24.40 mm
• Wide end inner diameter: 17.60 mm
• Narrow end outer diameter: 21.00 mm
• Narrow end inner diameter: 14.30 mm

Vehicle applications

• BMW 1 Series
  • E82 E88 135i and 1M 2006–2013 N54
  • F20 F21 M135i 2012+ N55
• BMW 2 Series
  • F22 F23 M235i 2014+ N55
  • F87 M2 2015+ N55
  • F87 M2 Competition 2018+ S55
• BMW 3 Series
  • E90 E91 E92 E93 335i 2006–2013 N54
  • F30 F31 335i 2012+ N55
  • F80 M3 2014+ S55
• BMW 4 Series
  • F32 F33 F36 435i 2012+ N55
  • F82 F83 M4 2014+ S55

Ideal for

• N54 single turbo and hybrid turbo setups needing stronger valve control at higher boost and RPM.
• N55 performance builds in M135i, M235i and 335i aiming for reliable top-end power.
• S55-powered M2 Competition, F80 M3 and F82 M4 track and fast-road use where sustained high RPM stability is critical.

Part number

SPRK-FE20N54-BE

Installation and support

Professional fitting is strongly recommended for all valvetrain work. Book your installation with MJ Modifications in Warwickshire. For a quotation and availability email info@mjmodifications.co.uk.

Manufactured by

Supertech

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