Covering 2.5 TFSI (TTRS, RS3) & 4-Cylinder 16V TFSI Applications
When pushing the performance boundaries of modern Audi TFSI engines, valve train stability becomes critical. STK Performance offers a range of high-quality valve spring kits tailored for the most demanding Audi engines, including the legendary 2.5 TFSI inline-5 found in the Audi RS3 and TTRS, as well as the popular EA113 and EA888 2.0/1.8 TFSI 16v 4-cylinder engines.
Why Upgrade Your Valve Springs?
Factory valve springs are designed for OEM cam profiles, limited RPM ranges, and moderate boost pressures. When you increase power with bigger turbos, more aggressive camshafts, or raise the rev limit, valve float, coil bind, and inconsistent valve control can become serious issues.
STK Performance valve springs solve these problems with upgraded metallurgy, engineering, and precision.
Key Features of STK Valve Springs
- High-Tensile Chrome-Silicon
Superior resistance to fatigue, heat, and spring surge at high RPMs. - Single Spring Designs (application-specific)
Optimal seat pressure with reduced mass and harmonics for stable valve control. - Designed for High RPM & Boost
Built to withstand elevated boost pressures up to 8500+ RPM depending on setup. - Matched with STK Retainers
Chromoly 4140 spring retainers available for complete valve train integrity. - Tested for Race and Street
Proven on high-output engines, including time attack, drag, and endurance builds.
Applications
2.5 TFSI (CEPA, DAZA, DNWA) – Audi RS3 / TTRS
STK’s 2.5 TFSI valve spring kit is engineered to handle serious boost and RPM levels seen in big-turbo builds (600–1000+ hp). This is a must-have for:
- Aftermarket camshafts
- Big turbo kits (Precision, TTE, Xona, etc.)
- Raised RPM limit tuning
- Circuit or drag racing reliability
Benefits:
- Prevent valve float above 7500 RPM
- Increased spring seat and open pressures
- Optional chromoly retainers for additional reliability
2.0/1.8 TFSI 16V (EA113 & EA888) – Audi A3, S3, Golf GTI, Cupra, etc.
STK valve springs for 4-cylinder TFSI platforms are ideal for builds exceeding stock power levels—whether it’s a hybrid turbo or full-frame kit.
Common Scenarios:
- High boost with OEM or uprated camshafts
- Engine tuning above 7000 RPM
- Road, track, or drag setups demanding higher valve control
Benefits:
- Prevent float or bounce under load
- Increase reliability at high revs
- Extend cam and lifter life
Why Choose STK Performance?
- Motorsport Proven:
Used in championship-level builds and performance tuning across South Africa. - Precision Manufacturing:
Springs are made under strict tolerances and load tested before shipping. - Platform Specific Kits:
Direct-fit kits available for all Audi TFSI heads with full install support. - Value for Performance:
Excellent balance of performance, reliability, and cost when compared to overseas competitors.
Final Word
If you’re building a high-power TFSI engine—whether it’s a 4-cylinder EA888 pushing 500 hp, or a 900 hp RS3 2.5 TFSI beast—the STK Performance valve spring upgrade is essential insurance. Prevent power loss, protect your valve train, and unlock true engine potential with confidence.
STK Performance — Engineered to Win.
For inquiries, compatibility checks, or installation support, get in touch with STK Performance.