Uprated valve spring kit AUDI 2.5 TFSI (CEPA CEPB CZGB DAZA DNWA)

The uprated valve spring kit SUPERTECH contains 20 springs and 20 retainers, and the FERREA kit contains 20 springs, 20 retainers and 20 spring seats.

Technical specification

• Spring type: single
• Outer diameter of the conical spring: 24.00mm
• Inner diameter of the conical spring: 16.50mm
• Seat pressure / installed height: 33.11kg @ 37.40mm (intake) / 38.56kg @ 36.00mm (exhaust)
• Seat pressure / at lift: 80.74kg @ 10.00mm (intake) / 86.18kg @ 10.00mm (exhaust)
• Max lift: 12.50mm
• Reference: SPRK-A2416-5

SUPERTECH valve springs are made from a high-grade chrome silicon vanadium steel alloy. This alloy delivers superior performance and reliability, above all at high engine speeds, and offers better structural memory. SUPERTECH uprated valve springs are designed by computer to keep harmonics under control and to hold stress levels within the limits of the material fatigue diagrams.

The SUPERTECH retainers are made from titanium alloy and CNC machined for the closest possible fit.

Technical specification

• Spring type: single
• Outer diameter: 22.38mm
• Inner diameter: 15.52mm
• Seat pressure / installed height: 36.29kg @ 37.00mm (intake) / 38.56kg @ 36.50mm (exhaust)
• Seat pressure / at lift: 81.65kg @ 27.00mm (intake) / 83.92kg @ 26.50mm (exhaust)
• Max lift: 11mm (intake) / 10.5mm (exhaust)
• Reference: KT4042

As with SUPERTECH, FERREA uprated valve springs are made from chrome vanadium steel and are heat treated. These FERREA springs are developed to keep harmonics and high-rpm fatigue under control, which avoids the springs going into resonance; they bring stability and reduce wear on the cylinder head components. Their design also limits pressure loss.

CNC machined, the FERREA retainers are made from titanium.