It might be borrowed from an SUV, but inside the WRX STI, the FA24 mill will be a devil

Whenever a new Subaru WRX STI is in the making, a large chunk of the car-worshiping community is bound to get excited. And while the 2020 WRX STI might be at least one year away, the rumor mill on what sort of firepower it’s going to pack has been spinning for a while.

Most reports hint that the go-fast WRX is in line to get Subaru’s new 2.4-liter FA24 powerplant that made its debut in the Ascent SUV, albeit in a higher state of tune. But what’s the deal with this new engine, anyway? Donut Media explains.

Some context, before you hit play

Here's the Science Behind the 2.4-liter Boxer Engine That Will Power the 2022 Subaru WRX STI
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Let’s take a step back and look at the bigger picture here. The outgoing 2020 Subaru WRX STI packs a 2.5-liter boxer engine that cranks out 310 horsepower and 290 pound-feet of torque. Now, while we were still waiting for word about a new WRX, rumors started popping up. These claimed that a new version of the WRX STI could arrive by 2021 or 2022 with no less than 400 horsepower on tap, as reported by Car and Driver.

The same rumors brought into discussion Subaru’s decision to use a 2.4-liter boxer engine that would replace the 2.5 mill. What’s more, the lower-displacement mill would be the same Subaru initially dropped inside the Ascent (the Legacy and the Outback also got it later on). In there, the 2.4-liter produces 260 horsepower and 277 pound-feet of torque.

Here's the Science Behind the 2.4-liter Boxer Engine That Will Power the 2022 Subaru WRX STI
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Furthermore, Gizmodo (quoting Forbes) reported a while back that the reworked 2.4-liter mill (codenamed FA24) will feature “reinforced crankshaft and pistons, optimized timing balance, fine-tuned valves and intake ports” as well as “other modifications.”

Obviously, this goes hand in hand with the claim that the new engine will crank out 400 horses but it also looks like Subaru is gunning for Mercedes-AMG’s 2.0-liter turbo four-cylinder good for 416 horsepower and 369 pound-feet of torque inside the 2020 AMG A45 and AMG CLA45.

Rumors and guesses aside, the guys over at Donut Media have put together a video that clearly explains how the 2.4-liter FA24 boxer engine works and what are its intricacies. Make sure to check it out below:

Tudor Rus
Assistant Content Manager - Automotive Expert - tudor@topspeed.com
Tudor’s first encounter with cars took place when he was only a child. Back then, his father brought home a Trabant 601 Kombi and a few years later, a Wartburg 353. At that time, he was too young to know how they worked and way too young to drive them, but he could see one thing – each of them had a different ethos and their own unique personality. As time went on, he started seeing that in other cars as well, and his love for the automobile was born.  Read More
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