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Here s the difference between turbo lag and boost threshold
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Engineering Explained tackles one of the biggest misunderstandings in turbo tech

December 7, 2017

If you’ve ever driven a car with a turbocharger like a Subaru WRX STI, old Mitsubishi Eclipse or any early examples of turbocharged cars, you’ll sometimes feel a sudden rush of power seconds after matting the accelerator -- commonly known as turbo lag. Jason Fenske of Engineering Explained dishes out the difference between lag and a similar principle: boost threshold.

As the video explains, the distinction is clear -- boost threshold is the rev range before the turbocharger starts spooling and adding compressed air into the engine. Boost lag is the time it takes after an engine crosses the boost threshold to the air hitting the intake manifold.

Developments in turbocharging have made boost threshold nearly a thing of the past, with twin-scroll turbochargers able to spool lower in the rev range and able to supply boost at higher engine speeds.

For a deeper dive into the mess that is boost threshold and turbo lag -- including some all-important whiteboard diagrams -- check out the video above.

If you’ve ever driven a car with a turbocharger like a Subaru WRX STI, old Mitsubishi Eclipse or any early examples of turbocharged cars, you’ll sometimes feel a sudden rush of power seconds after matting the accelerator -- commonly known as turbo lag. Jason Fenske of Engineering Explained dishes out the difference between lag and a similar principle: boost threshold.

As the video explains, the distinction is clear -- boost threshold is the rev range before the turbocharger starts spooling and adding compressed air into the engine. Boost lag is the time it takes after an engine crosses the boost threshold to the air hitting the intake manifold.

Developments in turbocharging have made boost threshold nearly a thing of the past, with twin-scroll turbochargers able to spool lower in the rev range and able to supply boost at higher engine speeds.

For a deeper dive into the mess that is boost threshold and turbo lag -- including some all-important whiteboard diagrams -- check out the video above.

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