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Stealth 316 3S Fuel Injection Control and Fuel Cut

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This technical note describes fuel injection timing and control in the Mitsubishi 3000GT VR4 and the. Dodge Stealth R/T Twin Turbo. The 6G72 DOHC 24valve ...

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Stealth 316 3S Fuel Injection Control and Fuel CutPage 1Fuel Injection Control and Fuel Cut in the Mitsubishi 3000GT VR4 and Dodge Stealth R/T Twin Turbo by Jeff Lucius TopicsIntroductionFuel Injection Driver CircuitsFuel Injector Activation TimingSequential InjectionSimultaneous Injection start crankingSimultaneous Injection cold startSimultaneous Injection acceleration enrichmentFuel Injection Amount ControlControl During Normal OperationClosed Loop Control (Feedback Control)Open Loop Control (Preset Map Control)Fuel CutSummaryReferencesIntroduction This technical note describes fuel injection timing and control in the Mitsubishi 3000GT VR4 and the Dodge Stealth R/T Twin Turbo. The 6G72 DOHC 24valve turbocharged 2.972liter V6 engine uses a multipoint fuel injection system that is electronically controlled. Fuel injection control for the nonturbo DOHC and the SOHC 6G72 engine is basically the same except for the specific features related to turbocharging. The fuel injectors themselves are described more completely in my web page 2injectortypes.htm. The cylinders are arranged and numbered as shown below. Because each piston begins its combustion stroke 120 before the next numerically successive cylinder there are three "pairs" of cylinders 14 25 and 36. Each cylinder pair move up and down together and are at top dead center (TDC) at the sametime. The intank electric fuel pump and the fuel pressure regulator provide pressurized fuel to the six fuel injectors mounted in the cylinder head intake ports. Each injector is activated indepedently by the engine control module (ECM). Because the injector nozzle spray area is constant and the fuel pressure is constant the amount of fuel injected is determined by how long the injector solenoid coil is energized that is by how long the ECM grounds the injector electrical circuit. The basic injection activation duration is determined by the intake air volume of each cylinder per engine revolution (A/N) which is de ...

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