Power Stroke

Twincharging and twin-turbo: how superchargers and turbos combine

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Engine bay of a 1985 Lancia Delta S4 with its twincharged supercharger and turbo engine

Twincharging and twin-turbo: how superchargers and turbos combine America was twincharging before anyone had a name for it. Greyhound buses and semis powered by turbocharged two-stroke Detroit Diesels carried a Roots blower and a turbo on the same engine. Not as an exotic racing trick, but because the engine physically could not run without the … Read more

Turbo lag: how variable geometry, twin-scroll and the electric turbo kill it

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Sectioned variable-geometry turbo housing with the movable vanes closed around the turbine

Turbo lag: how variable geometry, twin-scroll and the electric turbo kill it Every turbocharged engine ever sold has been a negotiation with the same flaw, and the car industry has spent fifty years and a fortune pretending the negotiation is over. It isn’t. It has just gotten very, very good. The flaw is turbo lag, … Read more