D-4S Engine Discussion Thread

[FR_S_Fan]

From the Toyota FT-86 boxer engine picture below we can see the engine code is D-4S. An article I was reading on a automotive news website cleared up the confusion about this since some thought it said C-4S, and strongly believed the FR-S engine code to be D-4S.

Things we can discuss about the FR-S 2.0 D-4S Engine:

- Specifications
- Engine Technology
- Horsepower & Torque

Feel free to include anything related.


Here's some information from a couple souces

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

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

It won’t surprise me if the 2.0 liter 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 liter engines with port injection can do.

Toyota FT-86 to feature D-4S Boxer engine

The 2.0-liter naturally-aspirated engine is the result of a joint development between Subaru and Toyota, bringing together their technical know-how and passion for sports cars. Subaru brings its newly developed horizontally opposed boxer engine while Toyota adds its D-4S technology (direct injection combined with port injection). This results in increased horsepower and torque without sacrificing fuel consumption and environmental performance.

The flat-four engine will be mated to either a six-speed manual or a six-speed automatic transmission. The manual will offer quick and precise shifts with a short-throw, while the automatic transmission will feature sporty shifts controlled by steering-wheel-mounted paddle shifts. Power will be distributed effectively to the rear wheels through a limited-slip differential.

Based on an entirely new front-engined and rear-wheel drive platform the production model will offer the driver confident stability and manoeuvrability, while still being quick and nimble into and out of any corner.

The FT-86 final production model will be realised around the idea of unique balance thanks to its compact dimensions, light weight design and low centre of gravity ensuring the best possible power-to-weight ratio and resulting in an intrinsic joy of driving.

from Toyota

[FT.HachiRoku]

Found a picture of the underside of the FR-S, from the passenger side.

Anyone know what the heat wrap is covering in the picture?

[AE86]

it what seems to be a fiberglass wrap from possible maybe the subaru version it maybe the exhaust being wrapped in fibre glass or even the headers are that low to the ground,

It being wrapped in fibre glass allows for quicker cooling.

[levin]

why wrap only a portion of the exhaust? interestinggg.

[FR_S_Fan]

Found a picture of the underside of the FR-S, from the passenger side.

Anyone know what the heat wrap is covering in the picture?

Interesting...

I bet this is to help with performance. If it was for that purpose I will be interested in finding out what difference it will make if the FR-S didn't have the heat wrap since it's just a small section being covered.

[levin]

Maybe they wrapped it because it was melting wiring or plastic nearby. Bad design? Last minute fix? I do see a wire close to it.

[cfrp]

Maybe to help with the bottom scraping?

[FR_S_Fan]

Maybe they wrapped it because it was melting wiring or plastic nearby. Bad design? Last minute fix? I do see a wire close to it.

I doubt it would melt any plastic around that area. A lot of cars have plastic panels very close to the engine and transmission which heats up a lot and melting plastic has hardly ever been an issue.

I'm almost sure it was wrapped to help concentrate the heat and help it escape the engine faster. But it could also be a last minute fix, we'll just have to wait for the fr-s production model to confirm what this is for.

Maybe to help with the bottom scraping?

I highly doubt that since it there's a part of the frame that sits lower than it or at the same level.

[rwdftw]

who knows what it could be but that wire looks to be a Sensor of some sort and that the bunged off the exhaust for an o2 sensor of some sort of something!

[import_nation]

o2 sensor wiring most likely.

[FR_S_Fan]

Thinking about it the wire and where it's located most likely it's a FR-S o2 sensor wire. Really can't think of anything else it could be. Then again we can never be too sure until official information is out.

During or after the 2011 Tokyo Motor Show we should find out.

[the4kbeast]

Interesting...

I bet this is to help with performance. If it was for that purpose I will be interested in finding out what difference it will make if the FR-S didn't have the heat wrap since it's just a small section being covered.

Check out the tires... the FR-S concept has SCION cut into the tires, so I don't think we're looking at a genuine picture of the underside of the concept. At this point we haven't seen pictures of the production version, so even if they were pictures of the FR-S we'd probably see a concept car mock-up of what will be reality in the roadgoing version.

I don't think they're designating D4-S as the engine code, that's just their marketing name for the direct injection system they have. The other cool thing about the D4-S direct injection is that they'll be able to lean the engine out while driving at highway speeds, so hwy fuel economy should be pretty good for a sports car. We'll have to wait and see.

Torquey D4-S direct injection + revy Yamaha heads = Happy 4k ; )

[import_nation]

Torquey D4-S direct injection + revy Yamaha heads = Happy 4k ; )

im with you on that one. The toyota d4-s injection system is very innovative.

[IronNam]

Exhaust wrapping keeping the exhaust temperatures higher actually allow for higher exhaust velocity, helps especially on turbo vehicles.