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Home GlossaryTurbocharger

Engine

Turbocharger

An exhaust-driven compressor that forces more air into the engine, increasing power output. Iconic JDM turbos: Garrett, HKS, Tomei, IHI. Twin-turbo setups (Supra 2JZ-GTE, 300ZX VG30DETT) use two smaller turbos for reduced lag. The heart of JDM performance culture.

Related Terms

Blow-Off Valve (BOV)

A pressure release valve that vents excess boost pressure when the throttle closes, preventing compressor surge. Atmospheric BOVs vent to air (iconic whoosh sound); recirculating BOVs route air back to the intake. Primarily a turbo protection device, not a performance mod.

Boost

Positive air pressure created by a turbocharger or supercharger, measured in PSI or bar. Stock boost on most JDM turbo cars: 7-14 PSI. Increasing boost is the simplest way to add power but requires supporting fuel and cooling modifications to stay safe.

Intercooler

A heat exchanger that cools compressed air from the turbo before it enters the engine. Cooler air is denser, producing more power and reducing detonation risk. Front-mount intercoolers (FMIC) are more efficient than top-mount (TMIC) but require piping modifications.

Wastegate

A valve that controls boost pressure by diverting exhaust gas away from the turbine. Internal wastegates are built into the turbo housing; external wastegates are separate units offering more precise control. Essential for regulating boost levels and protecting the engine.

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