1988 model year worldwide. Notable owners of the first generation Legend were Soichiro Honda the founder of Honda, Satoru Nakajima, Tyrrell Racing F1 driver in 1990, and Ayrton Senna. The Legend V6Xi was used as the pace car for the Suzuka Circuit for 1986. "Wing Turbo" version In October 1988, Honda upgraded the C20A V6 engine used exclusively in the KA5 series Legend with a variable geometry turbocharger, calling it the "Wing Turbo" in a Japanese TV commercial to address the modest power available from the previous engine with variable length intake manifold used in earlier models. The turbocharger compressor housing had four vanes made from heat resistant Inconel alloy surrounding the turbine wheel (on the inlet side of it) that would fluctuate based on engine load and transmission gearing above 2,000 rpm to allow for increased airflow into the engine as needed. The turbo compressor could generate as much as of boost, and was paired with a water cooled intercooler installed inside the intake plenum between the cylinder banks to produce net at 6000 rpm and a maximum torque of at 3,500 rpm. The turbo was installed not necessarily to make the engine more powerful, but rather to increase fuel efficiency and reduce emissions, as the Japanese pay a tax on the amount of emissions the car produces. According to an excerpt of Automotive Engineering in January 1989, "The movable wings are positive pressure- and vacuum-operated, their angle changes are controlled by an eight-bit 36-kilobyte computer that also manages fuel injection. Positive pressure to the wing actuator is supplied by the turbo's supercharge pressure, controlled by a frequency solenoid valve, and negative pressure is generated by intake vacuum and accumulated in a reservoir which is also solenoid controlled. The CPU is fed signals including boost pressure, intake temperature, coolant temperature, throttle opening, engine rpm, and vehicle speed. The Wing Turbo is not fitted with a conventional wastegate. On idling and steady-state cruising that do not require supercharging, the movable flags—or wings—which are fully opened, allow exhaust gas to enter the enlarged nozzle area and pass through the turbine smoothly with little resistance. At the beginning of full acceleration, the wings close fully, reducing the nozzle area through which accelerated gas enters and strikes the turbine blades forcefully, gaining boost quickly. When maximum boost is obtained, the movable wings begin to close gradually, until the vehicle reaches a desired cruising