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Unlike the Impreza WRX, the STI uses aluminum suspension components, and has different fenders that are 2.2 in (56 mm) wider. It adopted "Subaru Intelligent Chassis Design" and "Dynamic Chassis Control Concept". The turbo forces air through a larger top-mount-intercooler which has lost the red "STI" that was on previous generations.
The turbocharger directs air through a larger top-mount intercooler which has lost the red "STI" that was on previous generations. The STI (3,395 lbs) is heavier than the WRX (3,174- 3,240 lbs depending on trim) due to a more robust transmission, rear differential and other chassis reinforcements.
Compression ratio for the turbo engine falls to 10.6:1 from 12.5:1 for the FA20D. A revised variant of the FA20F was introduced for the 2015 model year Subaru WRX; in this application, the camshafts, rocker arms, boost pressure, intercooler, and exhaust were revised to increase peak output. [4]
The car's curb weight is 3,140 lb (1,424 kg) for the WRX TR, 3,192 lb (1,448 kg) for the WRX, and 3240 for the WRX Limited. The biggest change was the 2.5-liter turbocharged intercooled EJ255 engine, producing 230 hp (172 kW) at 5600 rpm.
Like the WRX, the B4 uses a bonnet scoop to feed a top-mount air-to-air intercooler. Manufactured by Sanden , the intercooler has an effective depth of 73 mm, a width of 140 mm and a length of 370 mm.
For the VA series WRX released in 2014 for the 2015 model year, Subaru decided to move away from marketing the WRX and WRX STI under the Impreza name. [13] This time, the Impreza name was dropped in all markets in which the new model is named simply as the WRX, as had been the case in North America with the previous model, while in Japan it was ...