This device uses exhaust gas to boost engine power. A small, lightweight turbine inserted into the exhaust manifold spins as exhaust gas goes speeding past. On the other side of the turbine shaft, fresh air is then compressed into the intake manifold. The more air that goes into the engine, the more power it can make. Unlike other forms of boosting intake pressure, the turbo used a virtually "free" source of energy in the form of waste gas. The knock on early "turbos" was a "lag," caused by the delay while the turbo came up to operating speed every time you floored the accelerator. Materials and technology advances have virtually eliminated this deficiency. Used judiciously, a turbo can actually improve fuel economy. 


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