The Toyota KR engine family is a straight-3 piston engine, designed by Daihatsu, a subsidiary of Toyota. The 1KR series uses aluminium engine blocks and chain driven DOHC cylinder heads. It uses multi-point fuel injection, and has 4 valves per cylinder. Some versions have VVT-i variable valve timing. The engine is exceptionally light: with all ancillaries. This is due to the nature of the applications and weight of city cars. 1KR-FE The 1KR-FE is a version built in Japan and Poland. Bore and stroke is , with a compression ratio of 10.5:1. Output is at 6000 rpm with of torque at 4800 rpm - and a rev-limit of 6500 rpm - or at 6000 rpm with of torque at 3600 rpm. When originally on sale it met European emission standard EU4 requirements and had levels of 109 g/km, but current applications meet European emission standard EU5 and can have levels as low as 99 g/km. This engine has been given the 2007, 2008, 2009 and 2010 International Engine of the Year awards in the sub-1.0 liter category. The engine was also adapted to meet European emission standard EU6 and can have levels as low as 88/89 g/km in Toyota Aygo or Citroën C1/Peugeot 108 since 2014 in NEDC. Applications Daihatsu Boon/Toyota Passo/Daihatsu Sirion/Subaru Justy Toyota Aygo/Citroën C1 (2005–2021) Toyota Vitz/Yaris (2005–present) Toyota Belta (2006–2012) Toyota iQ (2008–2015) Daihatsu Cuore L276 (2007–2013) Peugeot 107 (2005–2014) Peugeot 108 (2014–2021) Daihatsu Thor/Toyota Tank/Toyota Roomy/Subaru Justy (2016–present) 1KR-DE The 1KR-DE is the non-VVT-i variant of the 1KR engine made by Daihatsu. It produces less power and torque than the 1KR-FE. Output is at 6000 rpm and of torque at 3600 rpm. Bore and stroke is , while the engine displacement is . The 1KR-DE was specially designed for the Indonesian LCGC (Low Cost Green Car) market to reduce cost. The cylinder head cover is made from a light weight plastic-resin material. The exhaust manifold is integrated to the cylinder head together with the catalytic converter and oxygen sensor to save even more weight as well as helping the engine to warm up quicker, reducing total exhaust emissions. There was an overall saving of . Applications Daihatsu Ayla (2013–2023) Toyota Agya/Wigo (2013–2017) Daihatsu Hi-Max, based on tenth generation Hijet Truck (2016–2019) 1KR-DE2 The 1KR-DE2 is the more powerful variant of the 1KR-DE engine which is redesigned by Perodua. It produces at 6000 rpm and of