What does twin-turbo mean?

[StMiguel]

Twin-turbocharging is one of the turbocharging methods. To address the turbo lag phenomenon in exhaust gas turbocharging, two turbochargers are used in series (one large and one small) or in parallel (two identical ones). At low engine speeds, a smaller amount of exhaust gas can drive the turbocharger to rotate at high speed, generating sufficient intake pressure and reducing the turbo lag effect. Here is an introduction to twin-turbocharging: 1. When the engine operates with the combined effect of two turbochargers, the intake efficiency is significantly improved, the boosting effect becomes more pronounced, and the power performance is greatly enhanced. 2. At low engine speeds, only a low-speed turbocharger is working. At this time, a smaller amount of exhaust gas can drive this turbocharger to rotate at high speed to generate sufficient intake pressure. When the engine speed increases, the high-speed turbocharger continues to work, entering a high-boost state and providing a consistent and powerful performance.