FA20DIT vs FA20 D4-s?
 

I'm a little late to the party and just found out about the 2015 WRX.

[ame="http://www.youtube.com/watch?v=vKx-NMikeOQ"]First Drive: 2015 Subaru WRX | DSPORT Magazine - YouTube[/ame]


So what do you guys think about the DIT engine? I wonder if anything is interchangeable with the d4s.

Subaru obviously liked the FA20 platform enough to use it in their WRX. I'm curious to know if the actual block and head design are the same as the d4s. Obviously internals, no port injection on the intake manifold, and all that stuff will be different to accommodate their DIT. But I'm talking actual architecture of the "long block". I'm curious to know if they're the same or close.

I wonder how the direct injection by itself is going to work out for Subaru. This is their first DI engine of their own- on their own (used in their forester too).

Do you guys think having D4S is advantageous?

The real question, I wonder how both will compare against each other if both are brought up in potential/power.

They've been running the dit motor in the over seas legacy for over a year now.
I imagine that almost everything is going to be swappable. Whether or not the engine bay will have clearance, is another story.

remember reading somewhere that the DIT engine wont fit our car without mods to engine bay? Or something like if one wanted the bottom end of the DIT, it wouldn't mate to the D4S properly.

You get the gist.

as someone who likes to tune my car, i'm very very glad that we have port as well as direct injection. i don't see the benefit to only using direct (which is entirely possible if you choose with d4-s). being able to use bigger port injectors up top is better than having to source aftermarket direct injection parts.

notice the 10.6:1 compression... :)

Yes! That's how I see D4S as being advantageous. I'm also VERY glad that we have port injectors for the ease of sizing up.

With DIT, I wonder how guys are going to get larger direct injectors. I couldn't imagine how expensive those pieces will be.

I'm very curious what Subaru is going to do to combat the carbon build up on the back of the valves that comes from only having direct injectors. BMW and GM are already having lots of issues with this.

The WRX's new set up will be very useful as a reference/benchmark for FI upgrades to the 86 platforms. I am excited :D . Can't wait to FI my car in Spring

This. I would probably spray a bottle of Seafoam though the intake each time I changed the oil, but how effective would it be?

Upgraded aftermarket diesel direct injectors for newer(2012-2013) dodges and fords run around 500$ Per injector. Gasser ones should be on par with them id think, diesels do have to cope with ALOT higher injection pressure.

Just need to catch all oil from the intake manifold and there wont be any carbon.

Another reason why I think it wasn't Subaru ditching the d4s but rather Toyota wanting to keep that technology firmly in their grasp. Toyota's a business and one of the most successful in history. I can't see them handing over all their d4s tech that they took years to develop to a partner/competitor that never had any DI tech prior who can potentially use it for their own interests.

Looks
Like this car:
http://m.youtube.com/watch?v=d5RzMPr...%3Dd5RzMPrZvm8

As an aftermarket solution maybe, but a catch can would never come stock.

This page addresses some of the carbon buidup concerns:

http://kaizenfactor.wordpress.com/20...e-fa20-engine/

I believe we'll have issues with the turbo where it's mounted and the IC...after having to re-do those, your choice of FI kit may be cheaper. We'll see once the 2015 WRX hits the ground and n00bs start wrecking them.

Air/oil separator.

While an air/oil separator isn't common they do exist in factory cars. Hell, the 95 neon came with one.

As for the fa20dit, this has been discussed ad nauseum. IIRC, the rods and crank are the same. The pistons are hypereutectic, not forged, and don't have the proper crown shape for our spray pattern. The block has the starter on the wrong side and the turbo manifold won't fit as it will interfer with the body on our cars.

What I haven't seen covered yet is the differences in head flow, the valve train, and how the newer combustion chamber will do with knock resistance.

Exactly. Anyone who thinks Subaru hasn't considered this may not be paying enough attention.

Source: http://appft1.uspto.gov/netacgi/nph-...DN/20120080015

Awesome stuff. I wasn't doubting they would find a solution, just curious what it would be. Kinda cool to have a group of internet Sherlock Holmes's at your disposal.

I would like to get a close up look of the size of the DI injectors on the wrx engine. it would be nice if they fit the fa20 for FI applications as they most likely are larger. Audi/VW 2.0t FSI guys upgrade their stock injectors to S3 or RS4 direct injectors when going larger turbo. Maybe coupled with the WRX HPFP as well we can see some interesting results when tuned properly with the already available port injectors.

Well if this is true:
...Then likely the direct injectors from the wrx would not work with our piston bowls becuase of the difference in spray pattern. But who really knows untill someone gets their hands on one to play with.

Does anyone know the rod length and compression height of the new engine?

Subaru started developing DI tech a long time ago, but it was never meant to be used in a NA application. They first used DI in a turbo diesel engine in 2011. The FA20DIT was being developed before the 86 FA20. It was used in the JDM Legacy in like May 2012.

Correct me if im wrong but wasnt the ee20 turbo diesel unveiled in like 2007-2008?

NASIOC does most of my sleuthing for me. That patent for the AOS design has been known for ~2 years or so.

Has there ever been a diesel engine that didn't use direct injection?

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Actually, let me introduce you to the IDI. Indirect injection diesel. Found most comonly in the old ford 7.3l non powerstroke.

It seems like it has come standard on the fa20dit...

They were checking DI for some time, but FA20DIT is based on FA20. Their own engine technology was FB20 powerplant and the FA20 was clearly an evolution. It kinda goes like this:

FB20 -> FA20 -> FA20DIT

Possibly the greatest necro to date.

I wonder how much has changed in the SEVEN years ago that he posted that.

Lol. Just saw the last post by Jameson86 and didn't realise it is a necro posting!