From idle to 4000 rpm, the TT600 is wheezy and inconsistent, with a serious flat-spot between 3000 and 4000 rpm. It's singularly cold-blooded, too, a characteristic made worse by the lack of a fast-idle control-everything's automated by the injection computer. Once past the 4000-rpm threshold, the TT springs to life and hustles up through a decent but not class-leading midrange surge. Up top, between 10,000 rpm and the 14,000-rpm redline, the TT's massively oversquare engine puts out competitive power. (We'll know how competitive when we get the TT to a dyno.) Unfortunately, throttle-response is semiabrupt and not particularly well-sorted, making us wonder if the lack of fuel injection in 600s is not an oversight by the others.