High performance alloys were developed in order to improve the performance of turbochargers for automotive engines by leaps and bounds. The developed alloys are (1) a g -TiAl alloy for turbine wheels, which improved the high temperature oxidation resistance by a new surface treatment and (2) a heat-resistant magnesium alloy for compressor impellers with a specific high temperature strength superior to that of the conventional aluminum alloy, and (3) a high modulus steel for turbine shafts with a Young's modulus of 300GPa strengthened by the dispersion of titanium borides. The application of these developed alloys for rotating parts can reduce the inertia moment (Ip) by 42% and can increase the resonance frequency of shaft vibration by 44%.