Can anyone confirm the engine in a 2015 Subaru WRX?

[Mobius357]

It's definitely the FA20DIT, same as the Forester XT and Japanese Legacy GT. 10.6:1 CP and 15.9psi according to a couple articles I've seen. 268HP seems a bit low for that much boost, makes me wonder if they are under rating it like the outgoing WRX.

[serialk11r]

Unless I missed some news, Subaru's new direct injection has a new TGV system and direct injection only. The TGVs are necessary as the port injectors were what improved combustion at low rpm.

[boxer 2.5]

Sigh.. Home-slices! The New WRX uses the SAME ENGINE as the Forester XT. It is:
2.0XT (2013-) 1,998 cc (121.9 cu in) H-4 (FA20) 250 hp at 5,600RPM 258 lb·ft at 2,000rpm

The WRX will use the same base with 10:6:1 compression, different cams for higher performance (it squeezes 18 extra horses from the FA) Power comes on at 2,000 RPM!!! from a twin-scroll turbo (smaller than the current WRX, but larger than in the Forester, no other details given on trim sizes ect...) It uses Subaru designed direct injection, and it owes no "Royalties" to Toyota, as the engine design was theirs completely. If you want/need any more info, quote me so i get a notification or something. I will be buying the 2015 when it lands in APRIL 2014

[hmong337]

Originally Posted by boxer 2.5

It uses Subaru designed direct injection, and it owes no "Royalties" to Toyota, as the engine design was theirs completely. If you want/need any more info, quote me so i get a notification or something. I will be buying the 2015 when it lands in APRIL 2014

This is where I think you're wrong. Call me a Toyota fan boy but I do believe Toyota pitched the idea of doing a complete square 86x86 in the 4u-gse design. Subaru with their manufacturing excellence in boxer engines ran with the idea. Remember, Subaru wanted no part of this ft86 pitch in the beginning. It was Toyota's calling of the reincarnation of the ae86 which is what we have now. I proudly believe both companies collaborated neatly.

I don't believe that is was Subaru that didn't want to use d4s. Rather, Toyota not wanting to give Subaru the technology to use it as their own!

Yes, I'm on this side of the tracks. Toyota. I hate the debate of who the ft86 belongs to but as far as I'm concerned, Toyota IS the ft86 concept and subaru only makes awd cars. Subaru just so happened to take a large part in the 4ugse design and put the car together at their plant. Toyota put this entire concept together using Subaru parts. There was no such thing as a Subaru Hachi Roku.

[coyote]

Originally Posted by Figo

This is from Subaru official website:

NEW 268-HORSEPOWER 2.0-LITER DIRECT-INJECTION TURBOCHARGED SUBARU BOXER ENGINE

Sounds like a turbo vision FA20 with plastic cover.

So anyone can confirm this?

I've had my hands on both engines and apart from the port injection, they are near enough to identical. I know because I've interchanged parts and even found things inside the FA20 that are there for no other purpose than as a provision for the FA20DIT.

Originally Posted by hmong337

This is where I think you're wrong. Call me a Toyota fan boy ... blah, blah, blah ... fairy tales ... blah, blah, blah

Sorry mate, I'll go one step further and call you a gullible fan boy. The stuff Tada sprouts is marketing, to be taken with about a pound of salt and only really good for fertilizing your garden. If it makes you like your car more, I see no harm though.

FWIW, I bought the rebadged version with a big T on it because it was better value. The Toyota fan boy stuff makes me laugh, but I really don't care.

[Laika]

Originally Posted by coyote

...and even found things inside the FA20 that are there for no other purpose than as a provision for the FA20DIT.

Feel free to share more about this.

[chrisl]

Originally Posted by hmong337

This is where I think you're wrong. Call me a Toyota fan boy but I do believe Toyota pitched the idea of doing a complete square 86x86 in the 4u-gse design.

So the idea of a square engine with 86x86 now belongs to Toyota? Don't be ridiculous...

[hmong337]

Originally Posted by chrisl

So the idea of a square engine with 86x86 now belongs to Toyota? Don't be ridiculous...

It was always Toyota's. Get your head outta the sand...

[hmong337]

Originally Posted by coyote

I've had my hands on both engines and apart from the port injection, they are near enough to identical. I know because I've interchanged parts and even found things inside the FA20 that are there for no other purpose than as a provision for the FA20DIT.



Sorry mate, I'll go one step further and call you a gullible fan boy. The stuff Tada sprouts is marketing, to be taken with about a pound of salt and only really good for fertilizing your garden. If it makes you like your car more, I see no harm though.

FWIW, I bought the rebadged version with a big T on it because it was better value. The Toyota fan boy stuff makes me laugh, but I really don't care.

Name a RWD Subaru that buzzed like the original ae86...? ...yea, thought so

[Dimman]

Originally Posted by m.wood0213

I don't think Subaru would blatantly say its an FA20 because Toyota might demand royalties from the sales. However, FA20DIT might get Toyota away. I must say its not a pretty as our engine is.

Toyota already gets over 15% of everything Subaru does on all of their cars indefinitely.

Royalties are not an issue.

[chrisl]

Originally Posted by hmong337

It was always Toyota's. Get your head outta the sand...

A square engine displacing 500cc per cylinder is going to end up around 86x86. 500cc per cylinder isn't exactly a new idea (there are a LOT of 2L 4cyl engines and 3L 6cyl engines out there), and running a square bore and stroke isn't exactly a new idea either. I don't see what makes you think that it's something that either automaker explicitly deserves credit for. In my mind, it's kind of like saying "yeah, but it was Subaru's idea to give the engine spark plugs!" I think the 86x86 was chosen simply to hit a 2L engine displacement target, and to provide the engine with good power output characteristics. An oversquare (stroke shorter than bore) engine has better high-revving characteristics, but it sacrifices low end torque (for example, the 911 GT3, with a 102mm bore and a 77.5mm stroke), while an undersquare engine (long stroke) has good low end torque but sacrifices high revving capability (for example most diesels). The square engine design gives fairly good low end torque without sacrificing the capability to rev, which makes sense for this car.

Hell, the 2L 4cyl in the Mazda 626 from '83-'87 had an 86x86 bore and stroke, and I'm pretty sure Toyota had nothing to do with that one. The Toyota 1AZ also has 86x86 bore and stroke, but I doubt they were trying to evoke any particular history or feelings with that engine, since it was used in the Camry and Rav4. Other engines with similar bore and stroke include the S70/2 from the Mclaren F1 (86mm bore x87mm stroke), the Toyota 2jz (86x86mm), the Nissan SR20 (86x86mm), the BMW M52 (84x84mm), and even the Volkswagen Group's W16 from the Bugatti Veyron (86x86mm). At the end of the day, the simplest and most logical explanation for the 86x86 bore and stroke of the FA20 engine is simply that it provides desirable power characteristics, and it gives a displacement of 2L for a 4 cylinder engine, rather than assuming that they wanted to evoke any historical meaning.

[Bristecom]

Just to clear a few things up...

Ichitaka posted a development story about the twins a long while back. It said that they originally tried to tune the Subaru EJ engine but couldn't get enough power, economy, and efficiency from it at the same time. So a Toyota engineer (from the LFA engine team) suggested the 86x86 bore/stroke and direct injection to meet the targets. From there, Subaru was reluctant to do it since they had tested DI before with bad results, and Toyota managers were reluctant to do it due to not wanting to share technology - but after a prototype engine was made, both came to an agreement to use it.

And yes, this is the FA20DIT which has Subaru's new direct injection technology which does not combine port injection. Subaru saw how effective Toyota's DI was in the FA20 and decided to proceed with their own rendition.

[boxer 2.5]

Originally Posted by hmong337

This is where I think you're wrong. Call me a Toyota fan boy but I do believe Toyota pitched the idea of doing a complete square 86x86 in the 4u-gse design. Subaru with their manufacturing excellence in boxer engines ran with the idea. Remember, Subaru wanted no part of this ft86 pitch in the beginning. It was Toyota's calling of the reincarnation of the ae86 which is what we have now. I proudly believe both companies collaborated neatly.

I don't believe that is was Subaru that didn't want to use d4s. Rather, Toyota not wanting to give Subaru the technology to use it as their own!

Yes, I'm on this side of the tracks. Toyota. I hate the debate of who the ft86 belongs to but as far as I'm concerned, Toyota IS the ft86 concept and subaru only makes awd cars. Subaru just so happened to take a large part in the 4ugse design and put the car together at their plant. Toyota put this entire concept together using Subaru parts. There was no such thing as a Subaru Hachi Roku.

This isn't the FA20 in our cars. Very similar? Yes. But we drop the Toyota port/direct system, as well as the compression. Port/direct is harder to tune than just direct, and with the twin scroll they didn't want the hassle. Plus toyota didn't want their system in Subaru's showroom car haha. Im on the side of the tracks for a new WRX. The old was was... old!

[Dimman]

The straight DI on the turbo car is for cost/roi reasons. Knowing Subaru, they will have this injection setup in all of their cars with one variation or another.

With a responsive turbo, the rapid boost-building produces charge velocity in the intake port at earlier rpms than the NA setup. Charge velocity creates turbulence and mixing for better more complete combustion. The D4-S in the PI/DI setup is tuned to create superior mixing and combustion without a lot of charge motion. But since the turbo engine will already have the motion because of the pressure difference, the D4-S' superior mixing is only very slightly better with more complexity and cost. The only thing Subaru needs to add are the TGVs for idle and very low rpm operations, which are much cheaper.

There is no rivalry. They are partner companies and both benefit from the success of the other. Subaru got 3 engine architectures (FA20, FB20, FB25) to use thanks to Toyota. Toyota will make more money when Subaru sells more cars thanks to wider engine differences. Win-win.