The Toyota GR Yaris is built on a unique platform, combining Toyota’s new GA-B platform (which debuted on the new generation Yaris hatchback) and a rear section adapted from the GA-C platform used for the Corolla and C-HR. The rally team emphasised the importance of light weight and this is reflected in the use of aluminium body panels and a forged carbon composite roof in the body structure, and scrutiny of how weight could be reduced in parts throughout the car.
For the best possible aerodynamic performance, the body itself is another unique element: although based on the new Yaris hatchback, it is a three rather than five-door model, with a lower, tapering roof line. This has been designed specifically to direct wind flow onto the large rear rally car spoiler to generate extra downforce. As with a competition car, the shaping of the lower body efficiently channels airflow down the sides of the vehicle.
The engine is also all-new, a 1.6-litre, three-cylinder turbocharged unit. It is the world’s most powerful three-cylinder engine and also the smallest and lightest 1.6 turbo. Producing 261 hp and 360 Nm of torque, it complies with WRC2 technical regulations and can launch the GR Yaris from rest to 100 km/h in just 5.5 seconds, and on to an electronically limited top speed of 230 km/h. Its construction makes use of features derived directly from motor sport, including a ball bearing turbocharger, large-diameter exhaust valves and multi-jet oil piston cooling.
A kerb weight of just 1,280 kg gives the GR Yaris an excellent weight-to-power ratio of 4.9 kg per 1 DIN hp.
Engine power is harnessed through a Toyota’s new GR-FOUR permanent, electronically controlled all-wheel drive system. Another competition-inspired feature, this provides three driving modes with different front/rear drive torque to suit the conditions – Normal, Track and Sport.
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