What is the difference between a twin turbo and a biturbo?

twin-vs-bi-turbo توربو

Twin-turbo or biturbo refers to a turbocharged engine in which two turbochargers compress the intake charge.

Twin-turbo or biturbo refers to a turbocharged engine in which two turbochargers compress the intake charge. More specifically called “parallel twin-turbos”. Other kinds of turbocharging include sequential turbocharging, and staged turbocharging. The latter is used in diesel automobile racing applications.

When it comes to engines with two turbochargers, that simply means that more air is being sucked into the cylinders, compressed and ignited than would be possible for a single turbo or the engine to do on its own. When it comes to models that claim to be a twin turbo or biturbo, the terms are interchangeable. “Bi” means “two” which also means “twin.” There are different types of biturbo engines such as parallel or sequential turbos which may be where the confusion lies. Rest assured they are all still categorized as having two turbochargers.

Twin Turbo VS BiTurbo

They are two different terminologies for what type of turbo configuration you have in your car. What this means is that there is a turbo for each bank of cylinders, and they are located on opposite ends of the motor. One feeds off the other (there is a smaller turbo that spools up to create less turbo lag, at which point a larger turbo kicks in for the higher boost). From what I understand, that is the “technical terminology” The term twin turbo has been often given to vehicles that use sequential turbos, a small one for low rpm torque, and a larger one for higher rpms and power. The biturbo system uses two equally sized turbos, one fed by cylinders 1-3, and the other by cylinders 4-6. They are not sequential or in series, but in parallel. “Biturbo is the same as “Sequential Twin Turbo” Basically, you have 1 smaller turbo for lower RPM range, and a larger turbo for higher range. It helps greatly reduce turbo lag due to the smaller turbo can produce boost much earlier than a super single or twin turbo setup can do. At lower RPM, the smaller turbo spools and produces boost – then when you reach a preset RPM or boost level, a staging valve opens and directs air to turbo 2 (large one) and it now produces the boost for the engine. Usually, stage one turbo is turned off, or its boost is sent into the compressor intake of the stage 2 turbo to achieve a higher output pressure. Do not confuse Biturbo / Sequential Twin Turbo with “Twin Turbo”. Twin turbo is having two EQUAL size turbo’s. Each runs off its own cylinder bank in V or H type (boxer) engines, or off of a turbo manifoldon inline type engines. Both turbos share the load equally in producing boost air. (Like a dual core processor in your PC – both run at same speed, sharing the load equally) So, turbo lag still effects this type of setup, as both turbos will spool at the same time.”