Using turbochargers to increase performance was very appealing to the Japanese builders in the 1980s. The first example of a turbocharged motorcycle is the 1978 Kawasaki Z1R TC. It used a Rayjay ATP turbo kit to build 0.35 bar (5 lb) of boost. This raised the power up from to . It was only slightly faster than the standard model. Several other motorcycles were built with turbos. Turbo applications for motorcycles increased their price. The small gains in performance were not worth the extra cost. Since the mid 1980s, no manufacturers have produced turbocharged motorcycles.