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In February 1986, the bonds between the Celica and the Supra were cut; they were now two completely different models. The Celica changed to a front-wheel drive layout, using the Toyota "T" platform associated with the Corona, while the Supra kept its rear-wheel-drive layout. The engine was updated to a more powerful 2,954 cc (3.0 L) inline-six engine rated at 149 kW (200 hp; 203 PS). Although initially only available with naturally aspirated engines, a turbocharged version was added in the 1987 model year. The Supra continued its relationship with the Soarer.

The new engine used in the A70 Supra, the Toyota 7M-GE, was the flagship engine of Toyota's arsenal. Both versions of the engine contained 4 valves per cylinder and dual overhead cams. The turbocharged 7M-GTE engine was Toyota's first distributor-less engine offered in the US which used coil packs sitting on the cam covers and a cam position sensor driven by the exhaust camshaft.[23] It was equipped with a CT26 turbocharger and was rated at 172 kW (231 hp; 234 PS) at 5,600 rpm while the naturally aspirated 7M-GE engine was rated at 149 kW (200 hp; 203 PS) at 6,000 rpm. Further refinement on the turbo model increased power to 173 kW (232 hp; 235 PS) at 5,600 rpm and 254 lb⋅ft (344 N⋅m) of torque at 3,200 rpm in 1989. This was mostly due to a redesign of the wastegate. All models used the same tyre size of 225/50R16 on 16x7 inch wheels. Spare tyres were full-sized but on steel wheels.