There are not variable intake and 6PI systems. The 13B-T has a single twin-scroll turbocharger and the four-injector fuel injection from the 13B-DEI. The 13B-DEI is a little bit more powerful: 146 hp (109 kW) at 6500 rpm and 138 lb-ft (187 Nm) at 3500 rpm. This non-turbo engine was equipped with the 6PI, DEI systems, and four-injector electronic fuel injection. The second generation RX-7 came with 13B-DEI engine. The new technology significantly improved power and torque of naturally aspirated 13B engines. This engine also received a unique intake manifold with two-level intake box which provided a supercharger-like effect from the Helmholtz resonance. The 13B-RESI engine (Rotary Engine Super Injection) got Bosch L-Jetronic fuel injection system in 1984. In the future, the engine was switched to injection. Cars using this engine used the AP name (1974-1980). The first 13B engines had carburetor fuel system and single distributor in the ignition system.
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