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The heart of the 2018 Toyota Yaris GRMN is its engine, a unit that is unique in the B-hot hatch market in its use of a supercharger to boost performance.
The 1,798cm3 2ZR-FE engine is built by Toyota Manufacturing UK (TMUK) at its Deeside factory, with modifications carried out by specialists at the sports car manufacturer Lotus, also in Britain. Final engine build and installation is carried out by Toyota Motor Manufacturing France (TMMF) at the Valenciennes factory. Each one of the 400 built for European customers bears a numbered plate to mark its special, limited production status.
With a 10:1 compression ratio and the benefit of Dual VVT-i intelligent variable timing for both inlet and exhaust valves, the engine delivers a maximum 212 DIN hp/156 kW at 6,800 rpm and peak torque of 250 Nm at 4,800 rpm. Driving the front wheels through a reinforced six-speed manual transmission, and with the significant benefit of a Torsen limited-slip differential, the Yaris GRMN posts a nought to 100 km/h acceleration time of 6.4 seconds, and a nought to 400 m time of 14.2 seconds. Top speed is electronically limited to 230 km/h.
Weighing a modest 1,135 kg, the Yaris GRMN also achieves its performance target of a best-in-class power to weight ratio of 5.35 kg per 1 hp.
The supercharger, a Magnusson-Eaton unit, presented a particular design challenge, as only very limited space was available in the Yaris GRMN’s engine compartment. The packaging solution cleverly combines the supercharger, cooling unit and air intake in a single, space-saving stacked unit that can be neatly mounted on the front of the engine, within the required space tolerances.
Cooling is crucial for the engine’s performance, so an intercooler for the supercharger and an engine oil cooler are used, located in front of the radiator, together with a new, enlarged air intake to provide better engine breathing.
The engineering project also successfully introduced a new fuel injection system, using componentry originally designed for a V6 engine.
The exhaust has been fully reworked, a task that had to be achieved within very tight space limitations, and with careful attention to underbody heat management. The goals were to reduce exhaust back pressure and control emissions and noise levels, while also introducing a centre tailpipe design at the rear of the car – a feature shared with the Yaris WRC competition car. Success in this task has enhanced engine power and produced a rousing exhaust note. The design has also helped reduce the car’s overall weight.
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