Presentation: Subaru WRX STI NBR Challenge 2017

Subaru Tecnica International (STI), Subaru Corporation's sports car development and competition department, developed the impressive 2017 WRX STI NBR Challenge, a racing car that shares up to 70% of its parts with the 2018 street version of the Recently launched WRX STI in the Japanese market.

Thanks to the excellent engineering applied to production Subaru's that have used boxer engines since 1966, symmetrical permanent all-wheel drive since 1972 and stand out for their high torsional rigidity, the starting point for developing an excellent fast and reliable racing car is assured. Next, the news of the WRX STI NBR Challenge 2017.

STI has created a new Racing Technology division to extract information from last year's car and oversee its Motor, Engineering and Experimentation divisions with Eiji Tatsumi, former General Manager of the team, as technical advisor. Competition being the test bench used by Subaru to evolve its differential technologies, the engine used is derived from the strict series, and is based on the legendary EJ207 block that offers 340 horsepower and 461 Nm of torque.

In 2016, the SP3T category regulation made it necessary to reduce the diameter of the intake flange. In order to minimize the loss caused by this measure, STI has improved combustion efficiency by optimizing the internal parts of the engine and increasing the compression ratio. In addition, it has redesigned the exhaust manifold and used a single scroll turbo to improve the speed of torque and power delivery.

STI has created paddles on the steering wheel to make it easier for drivers to shift gears, they have reduced the development of the final group to improve acceleration, and thoroughly revised the transmissions and the control of the center differential.

One of the fundamental areas in a racing car is aerodynamic efficiency, for this reason the team has improved the load at the front with the use of a sharper bumper-hood assembly. The front wing and flat bottom have been redesigned and the intake and cooling intakes for the engine and wheel arches are larger. At the rear there are slight touches on the diffuser. On the other hand, in order to increase the quantity and quality of air available to pilots, the air intake to the passenger compartment has been redesigned.

To improve the car's handling, STI engineers have increased the wheelbase, rear track and front suspension travel. The Falken tires used also incorporate a new compound to increase their resistance to wear, improve cornering grip and allow the WRX STI to maintain the highest possible regularity in lap times. In addition, the rigidity of a multitude of components has been increased, the weight distribution improved and the car's electronics modernized.


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Automundo is the blog about news from the automotive industry, motorsport and the culture of the region. Director: Diego Durruty.

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