TiNi has been actively studied for high value-added industries, due to its excellent formability and shape memory characteristics. Quenched TiNi shape memory alloys (SMAs) have transformation path as B2→B19’. But as Ni is replaced by Cu, transformation path to B19’ is suppressed, and transformation path to B19 is promoted. Because B19 has many different properties from B19’ such as low modulus and large ductility, it can be a promising methodology to modulate phase transformation path to design SMAs. In previous researches, transformation to B19’ couldn’t be sufficiently suppressed because solid solubility of Cu in Ti-based B2 phase is limited. In this research, we developed TiNiCu-based super elastic alloys with extremely high concentration of Cu by fast quenching as well as minor addition of Si to stabilize B2 phase. As a consequence, we obtained B2→B19 transformation path, and the mechanical properties including damping properties were compared with those of TiNi.