The next-generation Subaru WRX STI could be coming with a new 2.4-liter engine if rumors are correct. According to a report from Road & Track, Subaru could use the new Ascent 2.4-liter turbo Boxer in the fourth-generation Subaru WRX STI replacing the aging EJ25 2.5-liter used in the current model when it arrives sometime in 2020. It’s reported the 2.4-liter turbo could make 330 plus horsepower in the new STI.
Subaru engineers developed the 2.4-liter powerplant for the Ascent 3-Row family hauler. The new FA24 Boxer engine comes with the latest direct injection and other internal upgrades for the best power and towing vs fuel efficiency. Could Subaru drop it in the fourth-generation WRX STI?
It features all-aluminum heads and block, to reduce weight and allows for more rapid warm-up. The internals include heads with dual overhead cams, driven by a timing chain rather than a belt, actuating 16 valves with variable timing.
It has a total engine displacement of 2,387cc with a 94-millimeter bore and an 86-millimeter stroke. The compression ratio is 10.6:1 which keeps cylinder pressures high for efficiency. It also features a twin-scroll turbocharger.
In the Ascent, the new FA24 engine develops 260-horsepower at 5,600 rpm and has a broad peak torque band of 277 lb-ft between 2,000 and 4,800 rpm. Subaru Technica International would rework the internals and bump up horsepower and torque considerably if they use it in the new WRX STI. Subaru could also use it mated with new hybrid technology being developed now.
Of course, this is all speculation and has not been confirmed by Subaru who declined to comment. Subaru needs to replace the aging 2.5-liter EJ25 Boxer in the fourth-generation 2020 Subaru WRX STI and the newest Subaru engine may get the nod. Stay tuned.
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Photo credit: Subaru Global