NISMO Racing Radiator Cap maintains a higher internal
pressure for the cooling system than the standard cap (Valve
opening pressure: 0.9kg/cm2 * 1.2kg/cm2 for Z32). It prevents
the coolant from boiling and vaporizing easily (the boiling
point is approximately 6 Deg.C higher than the standard cap’s
0.9kg/cm2 threshold) and improves cooling efficiency.