How Subaru Made Their Most Powerful Engine Ever - STI S209

Опубликовано 16 января 2019, 15:00

Subaru WRX STI S209 Uses A Water Sprayed Intercooler For Max HP
STI S209 First Look At NAIAS 2019 - youtu.be/FYsSeKJRKDs
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The Subaru STI S209 is the first time America gets an exclusive S Line Subaru STI. With a bigger turbo, revised intake and exhaust, new tune, and water injection system, the car now puts down 341 horsepower from its 2.5L boxer EJ25 engine. Forged pistons and connecting rods ensure the engine is up to the added pressures, and wider 265 bespoke tires all around, combined with Subaru's DCCD AWD system ensure the power is put down without a fuss. Here's how Subaru made their most powerful engine ever.

From Subaru's Press Kit:
- Debuts at 2019 North American International Auto Show
- First-ever STI-crafted S-line performance vehicle sold in the United States
- Limited production run of around 200 units
- Available exclusively in the U.S.
- 341-horsepower (est.) 2.5-liter SUBARU BOXER engine
- Aggressive new look with wide fenders, front canards and rear wing
- Performance-focused chassis with flexible strut tower bar and draw stiffeners
- Exclusive 19 x 9-inch forged BBS® wheels with bespoke Dunlop® SP - Sport Maxx® GT600A tires
- Brembo® brakes with new high-friction pads
- Available in two exterior colors: World Rally Blue Pearl and Crystal White Pearl

Subaru Tecnica International (STI), a wholly owned subsidiary of Subaru Corporation, today introduced the limited-edition STI S209, the first-ever S-line STI product produced exclusively for the U.S. market. As an S-line product, the STI S209 encompasses upgrades in power, handling, aerodynamics and driver engagement, and undergoes final assembly in Kiryu, Japan, where it receives engine modifications and bodywork alterations that in total require it to be homologated for the U.S. by STI; thus, the S209 is considered the first “STI-built” Subaru sold in the U.S. The S209 carries on a high-performance tradition that dates to STI-built models that were exclusive to the Japanese domestic market – the 2000 S201 through the 2018 S208.

A thoroughly reworked version of the legendary EJ25 2.5-liter turbocharged BOXER engine propels the S209. Featuring an STI turbocharger manufactured by HKS®, the EJ25 serves up an estimated 341 horsepower, thanks in part to a larger turbine and compressor (up 6 and 8 percent, respectively, compared to WRX STI) as well as maximum boost pressure that has been increased to 18.0 psi (16.2 psi for WRX STI). Proudly displaying an S209 serial number plate, the enhanced BOXER engine utilizes forged pistons and connecting rods that are both lighter and stronger. Midrange torque, too, gets a notable bump, up 10 percent at 3,600 rpm, delivering higher corner exit speeds when driving on track.

To feed more air to the EJ25, the S209 uses a high-flow intake system featuring a new intake duct, induction box with conical air filter, silicone turbo inlet duct and, a nod from the 2004-07 WRX STI, an intercooler water spray system that lowers intercooler temperature via manually operated steering-wheel paddles. More air demands more fuel, so the S209 receives a new high-flow fuel pump, larger fuel injectors and an STI-tuned engine control module. High-performance mufflers deliver 17-percent less airflow resistance while larger hand-polished stainless-steel exhaust tips – 101mm in diameter – deliver aggressive appearance and acoustics.
Source: media.subaru.com/pressrelease/...

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