Andrewhlava3

Sequential Turbocharging

Sequential turbocharging refers to a forced induction set-up by which an engine uses a smaller (primary) turbocharger for a near immediate response as little kinetic energy from the exhaust gas will be required to place it on an effective area of its compressor MAP; and a larger (secondary) turbocharger to efficiently provide steadily progressive compressed air throughout the engines power band. In Sequential Turbocharging all the Internal Combustion Engines (ICE) exhaust gas is first directed toward the primary turbocharger. However, after the exhaust gas travels through the primary turbocharger it’s directed toward the secondary turbocharger uninterrupted. This is called the “secondary priming phase”. During the secondary priming phase, the primary turbocharger will reach a peak efficient area of its compressor MAP and the secondary turbocharger will enter an effective area of its compressor MAP. Once the secondary turbocharger has been effectively primed per its MAP, and the Primary can no longer effectively use any additional exhaust gas per it’s MAP, the sequential-turbo manifold bypass valve(s) will begin to open accordingly and direct all the excess exhaust gas toward the secondary turbocharger bypassing the primary. These valves open gradually according to sequential turbo-manifold pressure and are specifically designed to allow a high-volume uninterrupted flow path towards the secondary turbocharger when needed, maintaining stability in boost control and turbocharging efficiency throughout the engine’s RPM band.

Note: On the Compressor charge side, a high flow check-valve (e.g. swing/flap valve) is used to keep charge air pressure from backing out the primary turbocharger once pressures have gone beyond the primary turbocharger capabilities.

Prior to the Patented Universal Hlava Sequential Turbo-Manifold this was never able to be done with such efficiency and effectiveness and while sequential turbocharging existed prior to it, the systems produced functioned differently and only existed for an OEM designed application where it was not able to be duplicated and used universally as single, twin and compound setups are among their specific ICE fuel type (e.g. diesel, gasoline, natural gas, etc.)  With the Hlava Sequential-Turbo manifold, designed and engineered by Andrew Hlava, any ICE that has been designed for forced induction can now utilize Sequential Turbocharging, no matter the fuel type and can remove the need of a wastegate or an electronic boost control system.

Manifold Layout

Dual Valve Stock

Hlava Sequential Turbo Manifold Installed