Twin-scroll turbochargers are great for improving performance during low and medium engine speed through the economical use of pulse energy. Doing this allows there to be no pressure interference between cylinders. Twin-scroll turbochargers are a type of pulse-turbocharged system where the exhaust ports of the engine’s cylinders are routed to the turbine through spiral shaped channels, also called scrolls, with both scrolls being a different diameter. In fact, twin-scroll turbochargers consist of only one turbo. Twin-Scroll TurbochargersĮven though biturbo and twin turbo is usually interchangeable with some trends towards either parallel or sequential dual turbocharger systems, twin-scroll turbochargers are something entirely different. These include Toyota’s MK4 Supra and Mazda’s FD Rx-7.
Some vehicles that are currently banned from the United States by the National Highway Traffic Safety Administration also utilize sequential dual turbocharger systems. For example, the 500i is equipped with a sequential dual turbocharged V8 engine that allows it to have an impressive 445 horsepower. Sequential dual turbocharger systems are often found with inline engines such as those in the BMW 5 Series. Generally, the term “biturbo” is used for this type of setup. When you accelerate, the larger turbo will kick in through the use of a compression valve. At lower revolutions per minute, the smaller of the two turbochargers functions. With two differently sized turbos, sequential dual turbocharger systems can provide enhanced efficiency even at lower speeds. If it is part of your vehicle’s original manufacturer equipment (OEM), you should be fine. Regardless of which you choose or your vehicle has, you will have to determine if your turbo is legal in the State of California. Unlike parallel dual turbochargers, sequential dual turbochargers utilize two turbos of different sizes. They generally have less turbo lag than some other turbocharger systems and can be found on the Nissan 300ZX and the Mitsubishi 3000GT. The fact that the two turbochargers are the same size is likely why this type of system is often called twin turbos. If instead you have a V8 engine, one turbo of the parallel dual turbocharger system would handle cylinders 1 through 4, and the other would handle 5 through 8. For example, if the engine is a V6, the first turbocharger may be assigned to cylinders 1 through 3 and the second turbocharger may be assigned to cylinders 4 through 6. Parallel dual turbocharger systems have two turbochargers that are the same size, both being assigned to their own engine bank. Sometimes parallel dual turbochargers are called “twin turbos” and sequential dual turbochargers are called “biturbo”, but this is not the rule, and you will often find that they are called the opposite term. Sometimes a vehicle manufacturer will use “twin turbo” or “biturbo” when describing their vehicle’s dual turbocharger system, though there is no agreed upon criteria regarding when to use one term over the other. When used in this context, there is no difference.
Twin turbo also carries a similar meaning. The “bi” in “biturbo” is a prefix meaning “twice” or “two” in Latin. They are interchangeable and have the same meaning. The following goes over what these words mean and what the different types of dual turbochargers are: Interchangeable UseĪgainst popular belief, the terms biturbo and twin turbo are synonyms. When talking about dual turbochargers you may hear the words “twin turbo” and “biturbo” thrown around. Through the use of forced induction, turbochargers increase the amount of air that is sucked into the engine to be compressed and ignited in the cylinders, leading to a more powerful engine.įor vehicles with 4-cylinder engines, single turbochargers are sufficient but when you get into V6, V8, and V12 vehicles, dual turbochargers are preferred. When in the pursuit of a more potent and efficient engine, turbochargers are one of the first directions many people look.
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