DualBoost Single Sequential Turbocharger

The 6.7L Power Stroke's Unique Turbocharger Design

 

How it Works: Ford's DualBoost Turbocharger

Ford's new diesel, the 6.7L Power Stroke (AKA 6.7L Scorpion Diesel) utlizes a single sequential variable geometry tubocharger. This is essentially a variable geometry tubocharger that features 2 compressor housings & 2 compressor wheels mounted on a single shaft. The image below simplifies the turbocharger design:

Arrow A and Arrow B point to the intakes of the 2 compressor housings. Arrow C & Arrow D point to the compressor wheels, which are mounted on the same shaft but in different housings. Each compressor housing has a different volume, giving this single turbocharger the benefits of a sequential turbocharger system. The turbocharger has a single exhaust housing, whose volume is controlled by the vanes of the variable geometry system.

Single Sequential Turbo Design Features:

The single sequential turbocharger really is a "2-in-1" turbocharger system; a single turbocharger that has the characteristics of a sequential twin turbocharger system. The single sequential turbocharger, or SST, is a Honeywell design. It features the quick spooling of a small turbocharger with the high volume air flow characteristics of a larger turbo, all in one small, more efficient package.