Supertech BMW N54 N55 S55 Conical Valve Spring Kit for M135i, 335i, M2 Competition and M4
Upgrade your BMW N54, N55 or S55 valvetrain with the Supertech Conical Valve Spring Kit. Engineered for the 3.0L N54B30, N55B30 and S55B30 engines, this Supertech valve spring kit delivers the stability and reliability demanded by tuned cars, high boost builds and high RPM track use. If you are chasing power on an N54 single turbo conversion, a hard-driven N55 M135i or an S55-powered M3 or M4, these Supertech conical valve springs are a proven solution to help control valve motion and reduce valve float.
We have fitted and used this Supertech kit on our own cars and customer builds, and feedback has been consistently excellent. Customers praise improved high RPM stability, smooth power delivery and confidence when pushing their BMW on the road or track. Supertech quality, conical spring design and titanium retainers make this one of the most trusted BMW N54 valve spring upgrades, BMW N55 valve spring upgrades and BMW S55 valve spring upgrades on the market.
Why choose Supertech conical valve springs
- Optimised for tuned BMW N54, N55 and S55 engines to help prevent valve float at high RPM and boost.
- Conical spring design reduces mass and resonance for improved valvetrain control and durability.
- Titanium retainers for strength and weight reduction, supporting reliable performance.
- Built to meet or exceed stringent industry standards from a brand trusted by enthusiasts worldwide.
Key search terms
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What is included
- 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 specifications
- Seat pressure: 75 lbs at 36.50 mm
- Open (lift) pressure: 155 lbs at 10.00 mm
- Spring coil bind: 23.20 mm
- Max lift: 12 mm
- Rate: 8 lbs per mm
- Wide end spring outer diameter: 24.40 mm
- Wide end spring inner diameter: 17.60 mm
- Narrow end spring outer diameter: 21.00 mm
- Narrow end spring inner diameter: 14.30 mm
Compatibility
- BMW 1 Series
- E82 E88 135i and 1M 2006 to 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 to 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)
Perfect for
- BMW N54 valve spring upgrade for single turbo or hybrid turbo builds.
- BMW N55 valve spring upgrade for M135i, M235i and 335i performance tuning.
- BMW S55 valve spring upgrade for M2 Competition, M3 and M4 high RPM track use.
Part number
SPRK-FE20N54-BE
Fitting and support
Professional installation is recommended for all valvetrain components. For fitting, choose Nforcd in Warwickshire. Request a quote and availability at Sales@nforcd.com.
Manufactured by
Supertech