Tomei Valve Sprins for Nissan GTR R35

High power generating engines which operate at high engine speeds require precision durable valve springs to suit the aggressive performance camshaft profiles that are used.

Combining multiple spring rates into one valve spring dramatically increases it's natural frequency. This improves the spring's harmonic resistance which also helps reduce the chance of spring surge.  

Standard oil tempered chrome silicon wire is widely considered to be the best material for manufacturing springs. However these valve springs are made using an enhanced version of the material. Paired with our highly optimized valve spring design these springs offer increased maximum rpm as well as improved resistance to fatigue and valve 'jump'/'bounce'.  

The 'Shot Peening' process involves the spring's surface being 'shot' with countless steel pellets/particles. This forms a layer of residual stress on the surface which improves the spring's resistance to fatigue.

'Hot Setting' is when the spring shape/form is set in high temperatures using a far greater load than intended. In doing so the spring is able to maintain and consistently deliver a high level of performance over a long period of time.  

Nitriding is used to further harden the surface of these valve springs. The process involves the springs being treated with nitrogen which once absorbed causes the spring's surface to compress and harden. This process was specifically employed to reduce spring fatigue when using high lift camshafts. 

Oval wire valve springs feature greater compression than regular valve springs allowing them to work with a wider range of 'lift' settings. This makes them compatible with both stock AND aftermarket high lift camshafts. (VR38/VQ35/KA24/4G63/4B11/G4KF)