The Clever Way Mazda Nearly Eliminates Turbo Lag

Mazda has an elegant solution to spool up the turbo in its 2.5-liter four-cylinder.

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Mazda

As turbochargers become more commonplace, automakers are developing innovative ways of reducing turbo lag. For its 2.5-liter Skyactiv engine in the CX-9 and 6 sedan, Mazda has a couple of simple solutions to get its single turbo spooled up more quickly. Engineering Explained's Jason Fenske breaks it down in his latest video.

Mazda uses a valve in the exhaust that closes below 1620 rpm to create a narrower air passage leading to the turbo. This increases the pressure of the air rushing to the turbo, which helps spool the turbine more quickly. That means you'll have to spend less time waiting for the turbocharger to kick in at low RPMs. The exhaust valve is aided by a four-to-three-to-one exhaust manifold designed to accelerate air out of the cylinders.

A lot of automakers are working on complicated tech to mitigate lag, including electric supercharging. Mazda's solution is much more simple, relying on smart engineering and basic hardware to achieve the same goal. Exactly the sort of thing we expect from Mazda.

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