The traditional turbocharger cannot match well with engine at all low speed and high speed conditions. At the same time the economic performance at sub load and acceleration characteristic is poor.

传统废气涡轮增压器很难同时兼顾高速、低速柴油机工况，同时存在着部分负荷经济性和加速性能差等问题。

youdao

The only time that the car gets really shouty is when you lash the engine during hard acceleration.

WSJ: 2012 Scion iQ Review: Slow, Whiny, Tiny��but Great to Park | Rumble Seat by Dan Neil