Engine technology thread.

[Dimman]

That power and torque curve looks very close (hard with the pic's detail) to the same one they used in 2006 for the intro to D4-S.

And it doesn't seem to be on a scale that makes it match. (ie, the peak should be more to the right if it really is at 6600)

[Ryephile]

Wow, those graphs are very similar.

[Levi]

Ryephile, I noticed the same thing. I wonder why torque curve and straight line performance were not yet revealed.

[Allch Chcar]

Originally Posted by Levi

I don't know if you already noticed this, but this is the torque curve of the GT86.

We can see the 205 Nm at 6.600 RPM.

Check the translation for that page. I believe that graph is for a different engine as an example.

[bambbrose]

Does anyone know what the fuel pressure is for the direct injector? Is it a static system or a return? Does it pressurize internal to the injector or have a pump and a separate fuel rail from the standard system?

[Kostamojen]

Figure these might be relevant for this thread:







I've seen headers like this before on Subaru's, just not very often. They are crossed over like that due to the piston firing order to make a near-perfect exhaust flow for the headers.

The muffler looks damn close to an Impreza hatchback muffler, even has Subaru stamped on the muffler.

[torquemada]

yeah, and it rusts like a Subaru muffler

[Kostamojen]

Originally Posted by torquemada

yeah, and it rusts like a Subaru muffler

Not something I ever have to worry about, LOL!

But the catback will be the first thing to go of course.

[Ryephile]

Originally Posted by Kostamojen

Figure these might be relevant for this thread:

Good call.

Looking at the engine stand pictures versus what's installed in the car, it's possible to discern the three fuel lines coming from the chassis to the engine; one for each port injection rail, and one going to the DI HPFP, which appears to be the right bank intake [behind the oil filler] and camshaft driven [usually via its own lobe]. No return lines from what I can tell, which puts it on par with everything current. Speaking of the DI system, the injectors appear to be inboard of the intake manifold, virtually out of sight.

I see cam phasers for intake and exhaust along with corresponding cam position sensors, all good. I see a pre and post O2 sensor on the main catalytic converter. The exhaust is fascinating; I have to admit I'm bummed there's no asymmetrical exhaust [and thus the warble tone], but this design looks reasonable for stock.

Oh, and i can't wait to rip off that "sound generator".

[Allch Chcar]

Those port fuel injectors are going to be easy enough to change I think. Should they ever need changing. >.>

[Dimman]

Layout like that exhaust will be probably what turbo kits do, with the turbo around where the catalyst is.

The intake runners are weird, really flaring away from the plenum.

[Ryephile]

Originally Posted by Dimman

The intake runners are weird, really flaring away from the plenum.

They are? How else would they run them without forcing the hood several inches higher?

[Dimman]

Originally Posted by Ryephile

They are? How else would they run them without forcing the hood several inches higher?

In the side view, when they come off the plenum they look narrow, but they flare out to quite wide towards the head where the port injectors are. But in the front view the alternator is blocking the view from that angle, so it's difficult to say if they are expanding, or just changing shape.

Is this thing using TGV's/variable intake runners? Subaru and Toyota both use them currently, except the D4-S 2GRFSE motor doesn't.

[Kostamojen]

Originally Posted by Dimman

Is this thing using TGV's/variable intake runners? Subaru and Toyota both use them currently, except the D4-S 2GRFSE motor doesn't.

No TGV's on this motor. The new DI turbo motor next to it is however, which is rather interesting.