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The anti-lag system (ALS) is a method of reducing turbo lag or effective compression used on turbocharged engines to minimize turbo lag on racing or performance cars. It works by retarding the ignition timing and adding extra fuel (and sometimes air) to balance an inherent loss in combustion efficiency with increased pressure at the charging side of the turbo.
These engines can be identified by smooth valve covers, plug leads and a wasted spark coil in the middle of the intake manifold. In addition, the inlet manifold may be bare aluminum for all WRX models and red for all STI models. The engine utilizes an IHI ball-bearing turbo unit. VF22 on the WRX, either a VF23 or VF24 on the STI.
Mazda went back to the 4 port intake design similar to what was used in the '74–'78 13B. In '86–'88 engines the twin-scroll turbocharger is fed using a two-stage mechanically actuated valve, however, on '89–'91 engines a better turbo design was used with a divided manifold powering the twin-scroll configuration. For engines manufactured ...
Additional turbo variants, not offered in the US market, were the B19ET and the B21ET, based on the B19E and B21E respectively. The turbocharger increased power output to 127 hp (95 kW) for the B21FT, and 155 hp (116 kW) for the B21ET. 6.5 psi (0.45 bar) boost on the B21FT and 9 psi (0.62 bar) boost on the B21ET.
The 235-horsepower version had argent silver valve covers and air cleaner. A dealer-installed "M 260" engine kit was released in January 1956. The kit consisted of a hotter camshaft, revised cylinder heads, and an intake manifold mounting two four-barrel carburetors. The kit was advertised as boosting the Mercury 312 V8 to 260 hp (264 PS; 194 kW).
The Lucas fuel injection system on the 3.6 L (3,590 cc) AJ6 engines in these early XJ-S cars sensed engine load using a Manifold Absolute Pressure (MAP) sensor just like the V12 cars from the same era. Later 3.6 L (3,590 cc) AJ6 engines as used in the 1986–1989 XJ40 cars had a crank-sensor type of ignition system with a bare distributor that ...
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The primary turbo (located at the left rear of the engine) delivers boost in the low rpm and load range, while the secondary turbo comes in to aid mid-to-high range breathing. During the primary turbo stage, boost pressure is controlled by a conventional arrangement of an ECU-controlled duty-cycle solenoid and an internal wastegate.