Notable features include siamesed cylinders, aluminium rocker arms and pistons, thin block walls, and single valve springs - all in the interest of reducing weight.

The E1 was strictly intended for export markets where taxes based on engine size made this a popular alternative.

Released in 1983 and available only in Japan, the E5T utilized an IHI-supplied VJ1 turbocharger running approximately 0.5 bar (7.3 psi) to produce as much as 115 PS (113 hp; 85 kW) and 162 N⋅m (119 lb⋅ft; 17 kg⋅m) (JIS gross).

Other notable advancements included an integrated knock sensor (supplied by Mitsubishi) and multi-point fuel injection as standard.

It was exclusively available in Australia as part of the White Lightning Ford Laser limited-edition package of just 300 cars released in June 1985.

The engine started out as a normal E5S and then an IHI RHB52 turbocharger was fitted, setup in a blow-through style, with boost limited to just 5.1 psi (0.35 bar).

A Compuspark ignition system with knock sensor was also added to prevent engine damage if the driver ever used a lower octane fuel than the 97 RON that was recommended.