gear gear gear

facebook instagram twitter youtube linkedin issuu wikipedia tripadvisor izi.TRAVEL GoogleArtsmini

Motore Subaru Boxer EJ257 - 2.5 Turbo
2004 - 2012



The boxer engine EJ257 is one of the most powerful versions of the Subaru EJ family. It has been produced since 2004 for the Impreza WRX STi sport car which, in the various competition versions, achieved many successes in the international rally championships.

Technical specifications

ManufacturerSubaru, Fuji Heavy Industries, Japan, from 2004 to 2012
Descriptionboxer 4-cylinder engine, cylinder block, heads and pistons made of aluminium alloy
Stroke79 mm
Bore99.5 mm
Displacement2457 cm³
Compression ratio8.71
Power300 hp at 6000 rpm
Torque407 Nm at 4000 rpm
Specific power122.1 hp/litre
Valvetrain system4 valves per cylinder with hydraulic tappets, controlled by two overhead camshafts in each head, with intake variable timing system, driven by toothed belts
Fuel feeding systemmultipoint port fuel (gasoline) injection operated by an electronic control system
Supercharging systemexhaust gas turbocharger IHI with and air-to-air cooler
Ignition systemone spark plug and one ignition coil per cylinder, controlled by an integrated (ignition-injection) electronic system
Cooling systemliquid-fed by a centrifugal pump
Lubrication systemforced by a gear pump
Mass120 kg


Subaru Impreza WRX STi


Kind donation of Mari Service srl.

Testi e immagini di Giuseppe Genchi
Sito realizzato da Pasquale Pillitteri