The Nissan KA24DE engine is a fairly recent development in their automotive technology. It is a 2.4 Liter Fuel Injected 16-valve Dual Overhead Cam 4 Cylinder engine. It is available in the 240SX from 1990 up as well as the Altima from 1992 onward. The engine is actually a redesigned KA24E engine which has been used (under the name U13) in Nissan pickups.
The engine respons very well to turbo, and is actually available as a stock turbo engine in Japan as the KA24DET.