Turbocharger

A turbocharger (often called a turbo) is a forced induction device that increases an engine's efficiency and power output by forcing extra compressed air into the combustion chamber. This allows the engine to burn more fuel and produce more power without increasing the engine's displacement.

A turbocharger consists of two main parts: a **turbine** and a **compressor**, connected by a shared shaft. The turbine is driven by the engine's hot exhaust gases as they exit the exhaust manifold. As the turbine spins, it drives the compressor, which draws in fresh ambient air, compresses it to higher pressure, and forces it into the intake manifold. To optimize density, the compressed air is often passed through an **intercooler** (a heat exchanger) to cool it down before it enters the engine.

Because turbochargers rely on exhaust gases, they experience a slight delay in power delivery when you step on the gas pedal, known as **turbo lag**. Modern turbos use variable-geometry turbines or twin-scroll designs to minimize this lag.

Turbochargers operate at extreme rotational speeds (up to 250,000 RPM) and high temperatures, relying on clean engine oil for lubrication and cooling. Failure to change engine oil regularly can cause oil starvation and bearing damage, leading to turbo failure. Symptoms of a failing turbocharger include blue or grey exhaust smoke, a loud whining or whistling noise (often called a "siren" sound), loss of boost pressure, and sluggish performance.