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The Turbo starts spooling at 1,850RPM and reaches full boost by 2,000RPM. It's a tiny turbo too. But even when the turbo isn't spooled, locked into high gear in manual mode, the engine has decent torque, starting at 1,500RPM. Then, in drive, once that turbo spools, there is just so much torque. The power band of this engine is happiest from 2,500RPM-5000RPM. Over that, it kinda loses steam (confirmed by the torque and horsepower numbers. Torque is 148lb/ft from 1,850-4,900RPM, Horsepower peaks at 4900RM and drops off after, to the redline of 6,500). This means that any time you put your foot down enough to keep it in this powerband, it just goes like you would never expect a tiny 1.4L to pull.
This menas that going up hills, and accelerating under light foot means that even without downshifting, it will pull decently. It can't really be described without driving a turbo car. If you haven't driven one, you probably don't know what it feels like. You don't expect a four cylinder, especially one this tiny, to have gobs of torque at just above 2000RPM. The engine itself is pretty fantastic so far. There is a danger of turbo engines though- one that I will get to in a bit.
We just bought a new 2011 Regal 2.0 Turbo, and you have described it's behavior perfectly. Having never owned a Turbo car, I am VERY impressed with how much torque this tiny engine has at 2000 rpm. Feels much more responsive than the naturally Aspirated GM 3.8 V6 we had in our last car (Impala).