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A blowoff valve is designed to release pressure in the intake system when the throttle is closed. A "recirculating" type blowoff valve releases the pressurised air back into the non-pressurized section of the intake (i.e. upstream of the turbocharger), while an "atmospheric venting" type blowoff valve dumps the air directly into the atmosphere.
A method by which a large one-way check valve is inserted just prior to the throttle body, enabling air to bypass the turbo, intercooler, and piping during periods where there is negative air pressure at the throttle body inlet. This results in more air combusting, which means more air driving the turbine side of the turbo.
An internal wastegate is a built-in bypass valve and passage within the turbocharger housing which allows excess exhaust pressure to bypass the turbine into the downstream exhaust. Control of the internal wastegate valve by a pressure signal from the intake manifold is identical to that of an external wastegate.
The engine uses a twin-scroll turbocharger with electronically-controlled wastegate/bypass valve, air-to-air intercooler, stainless-steel dual-scroll (1–4, 2–3) exhaust manifold designed to withstand 980 °C (1,800 °F) turbine temperature, and a rotacast aluminium-alloy (A356T6) cylinder head with sodium-filled exhaust valves. [17]
variable geometry turbo intercooler Nissan Almera (N16) Nissan Almera Tino (V16) 2003–2005: 82 kW (112 PS; 110 hp) at 4000 rpm 100 kW (136 PS; 134 hp) at 4000 rpm: 247 N⋅m (182 lb⋅ft) at 2000 rpm 304 N⋅m (224 lb⋅ft) at 2000 rpm: common rail direct injection variable geometry turbo intercooler Nissan Primera (P12) Nissan Almera (N16)
The SRT-4 has a cast-aluminum 8-row Valeo intercooler mounted in the front, and the reverse-rotation Mitsubishi TD04LR-16Gk turbocharger has a 6 cm 2 (1 sq in) turbine inlet. The turbocharger compressor housing features a built-in bypass valve, and the turbo housing is cast into the exhaust manifold with a loop-around flow pattern.
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