The first generation of the 240SX can be divided into two distinct versions, both having the sporting advantage of rear wheel drive. The hatchback, which was offered in base, SE, and LE trims, and the coupé, which was offered in base, XE, LE and SE trims. Both styles shared the same front bodywork as the Japanese-market Nissan 180SX, featuring the sloping front with pop-up headlights. This front bodywork distinguishes the coupé model from its Japanese-market counterpart, the Silvia, which featured fixed headlights. Both styles in all markets share the same chassis, and with few exceptions, most components and features are identical. The 240SX is a popular car in the sport of drifting due to its long wheelbase,[1] low cost, ample power, light weight, well-balanced chassis and abundant aftermarket support. 1989 and 1990 models are powered by a naturally aspirated 140 hp (100 kW), 152 lb⋅ft (206 N⋅m) 2,389 cc (2.4 L; 145.8 cu in) SOHC KA24E 4-cylinder engine with 3 valves per cylinder (instead of the turbocharged and intercooled 1.8-liter DOHC CA18DET offered in Japan and Europe in the 180SX and Silvia). Four-wheel disc brakes were standard, with anti-lock brakes available as an option on the SE. Both models were offered with either a 5-speed manual or 4-speed automatic transmission. Coupes offered a Heads-up display (HUD) with a digital speedometer as part of the optional Power Convenience Group.

The 240SX received some updates in 1991. The matte silver, teardrop wheels were replaced by polished aluminium 7-spoke wheels that had better brake cooling properties but more drag. The nose was smoothed out by getting rid of the non-functional slots and gave back the aerodynamic efficiencies lost by the wheels. This gave the car an overhaul that included a minor update of the exterior and a new cylinder head. A new LE hatchback trim package was added that included leather interior. The SOHC KA24E was replaced by the DOHC KA24DE, now with 4 valves per cylinder, rated at 155 bhp (157 PS; 116 kW) at 5,600 rpm and 160 lb⋅ft (217 N⋅m) at 4,400 rpm of torque. An optional sports package including ABS, a limited-slip differential, and Nissan's HICAS four-wheel steering was now available on hatchback models.