Four-cylinder will replace the 1.33-litre unit, and it could spawn the basis for a turbocharged version to power the hot Gazoo model

The Toyota Yaris has gained a new 1.5-litre naturally aspirated engine that will offer better performance and fuel economy than the 1.33-litre it will replace. It could also form the base for a more powerful turbocharged unit that will feature in a Toyota Gazoo hot hatch.

The four-cylinder engine produces up to 110bhp and 100lb ft of torque, which is 12bhp and 30lb ft more than the outgoing motor. This added potency enables a 1.5-litre Yaris to accelerate from 0-62mph in 11sec, which is 0.8sec quicker than the 1.33-litre car. It can also power from 50-75mph in 17.6sec – the old model took 18.8sec.

No fuel consumption figures have been released, but Toyota’s claim for a 12% improvement equates to an average economy figure of about 64.5mpg. The old 1.33-litre offered 57.6mpg.

Toyota’s new engine meets Euro6 emissions standards and has been engineered to achieve a 38.5% thermal efficiency value, which ranks it at the sharp end of its class. The unit’s high 13.5:1 compression ratio, cooled exhaust gas recirculation (EGR) system and extended variable valve timing operation, which can switch it from the Otto to the Atkinson cycle, are listed as significant contributions to the boosted efficiency.

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The engine is also connected to Toyota’s first water-cooled exhaust manifold system, which is said to boost efficiency when cruising at motorway speeds. The technology reduces exhaust gas temperature, enabling the engine to run with a reduced fuel mixture, reducing combustion temperature and improving both fuel consumption and exhaust emissions.

The Japanese brand has refrained from revealing whether a more potent version of the 1.5-litre will be produced at a later stage, but sources close to Autocar have suggested it will form the base for the turbocharged four-cylinder unit that will power an upcoming Gazoo Yaris hot hatch.

The front-drive car, which will be a rival to the Ford Fiesta ST and Renault Sport Clio, will make its debut at the Geneva motor show and is said to have more than 210bhp.

Join the debate


24 January 2017
Maybe an upsize down-revving normally aspirated engine is a better approach than the usual small capacity turbo. It would be good to know more about the philosophy of the exhaust cooling: there is no mention of energy recovery so I can't see the benefit unless the recovered heat is used to reduce engine warm up time? That said a thermal efficiency just short of 40% sounds pretty good for a petrol engine.

24 January 2017
LP in Brighton wrote:

It would be good to know more about the philosophy of the exhaust cooling...

It doesn't seem to be very well explained here. It has cooled EGR, which does its usual thing. The cooled exhaust manifold reduces/eliminates the need for full-load mixture enrichment as the exhaust manifold can protect itself from the high temps so doesn't need the excess fuel to do so.

24 January 2017
That makes sense and shows that Toyota is concerned with real world efficiency, not just the headline test cycle figures which would not involve full load conditions.

24 January 2017
How can such a small light car with a 1.5 litre engine take so long to get from 50-75mph, 17.6 secs. That's basically means changing down a gear every time a lorry moves over for you on a dual carriageway.

24 January 2017
Its a bizarre world where a Yaris comes with a 1.5 4 pot, and a Mondeo comes with a 1.0 3 pot. Is this new engine related to the Yaris Hybrid powerplant, just without the electrics?

Anyway, it sounds interesting technology, even if it still leaves the yaris being rather slow. I doubt anyone who buys a standard Yaris will mind or notice though.

24 January 2017
seems to suggest the car has been hobbled with interstellar gearing. It might work on a test rig but does nothing for MPG in real world driving.

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