Toyota D-4S Boxer

A pretty sharp reader managed to point out that the words found on the Toyota FT-86 boxer engine is actually D-4S Boxer and not C-45 Boxer. Now this makes so much sense, and also gives us an idea of the kind of technology that’s going to be found in the new engine. We can also predict its power output based on other engines that have featured D-4S and high compression in the past, like the 2GR-FSE.

The fact that the production version of the FT-86 coupe will feature D-4S is not new actually. Sometime earlier this year at the Tokyo Auto Salon, Akio Toyoda said that the production car will not be coming very soon because a new boxer engine with Toyota D-4S technology was still being developed. The Subaru version of the FT-86 (if it’s still going to be produced) will also feature its own Subaru D-4S Boxer engine.

D-4S is basically an advanced variant of Toyota’s D-4 direct injection system. You might have noticed D-4D badging on local Toyota Hilux pickups – that’s their diesel direct injection. D-4 is basically gasoline direct injection, and D-4S stands for D-4 Superior. D-4S combines both direct injection and conventional port injection for each cylinder which means two injectors per cylinder, or eight injectors if the engine is a 4-cylinder boxer like the FT-86 production car will have. The system will pick between the two types of injectors according to needs (here’s a good story on how it works).

In the 2GR-FSE 3.5 litre D-4S V6 engine, it allowed Toyota to tune the engine for very impressive torque to litre ratio figures for a normally aspirated engine. 377Nm of torque from a 3.5 litre engine while maintaining good emission, refinement and fuel consumption figures is not easy to get.

It won’t surprise me if the 2.0 litre D-4S Boxer engine in the production Toyota FT-86 coupe may make over 160 to 170 horsepower and around 210 to 215Nm of torque, which exceeds what regular 2.0 litre engines with port injection can do.

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