Variable geometry turbos promise better boost and efficiency, but do all Cummins engines include them? Dive into the tech and ...

By Pat Ganahl A supercharger—such as a turbo—compresses air. Compressing air heats it. Heating air makes it expand. This is a Catch 22 inherent in supercharging ...

Turbo wastegates help your car's turbocharger spin at just the right speed. But if they get stuck, a legion of bad consequences will follow.

Audi solves the problem of turbo lag another way entirely. It uses a small compressor, also powered by a 48-volt electrical system, to essentially "pre-charge" the existing conventional turbochargers.