here ya go!

http://www.sae.org/automag/techbrief...1-114-1-17.pdf

Any info on maybe a compression ratio?

2GR-FSE was 11.8:1 says that article...I think they can beat that this time around. I'd guess approximately 12:1. More would be awesome :)

So that article seems to say that D-4S achieves very good fuel mixing and combustion efficiency compared to your typical fuel injector setup. Now the GR engines were rev limited pretty low as I remember, but someone said it's possible to get a crapton more power out of them. Does this require new cams though? I definitely remember looking up that motor, torque drops off towards its low redline, sounds like cams weren't that aggressive.

This... and holy shit this is goign to open the door on the GR and UR engines... I've been practically salivating. What would I pay to be very close friends with a rogue Toyota ECU engineer ***sigh***

This. Nigh impossible is the more appropriate description.


Yeah.. these engines have a shit ton of power corked up in them and might even be slightly underrated. I think I need to buy me and engine brake setup and a couple 2GRs.. someone needs to crack this puzzle...

So no word on who is actually providing the ECUs yet? I doubt each model to have its own, though its a possibility.

That would be silly for a badge engineering job. Unnecessary work to create two different ECU's for what is mechanically the same car.

I think what will happen is that it will be a toyota ecu, but the plugs that connects to the body and transmission harness (subject to configuration of course) will be Subaru spec. Why? If they are going to make it so "easy" to plop in a Subaru EJXXX motor, might as well make it easy to just take a subbie ECU, engine harness and plug em up. Couldn't get easier than that. It is however, very wishful thinking.

Why wouldn't it be a Subaru ECU/Software running the whole shebang? D4-S.

Denso. I'll bet you five bucks.

:laughabove: That isn't "tuner" Jordo. Tuners work on ECUs and maybe the chassis not the body/show stuff.

With D4s you can upgrade injectors easier and you can always upgrade the fuel pump but the tuning is a whole separate issue.

This is not encouraging for a Toyota ECU :(.

I would think the end compression would depends on the bore x stroke. The old Subaru's weren't exactly high compression happy designs like say Honda's. With their wide bore x short stroke and their low rev setup for USDM cars. A square design isn't the most knock resistant design either though. That is the one advantage I could find with the undersquare design.

That would be so cool. But sadly the ECUs pinouts differ between USDM and JDM so I don't believe that it is even possible. :iono:

Heh. Does Denso usually supply ECUs for Toyota and Subaru?

Do you mean Subaru ECUs? They are the same between JDM and USDM AFAIK, there is only AVCS and non AVCS ECUs that you have to watch out for. You can get a JDM EJ207 and run it off a 2002 USDM WRX ECU, you just have to make your own AVCS wiring bundle and obviously a new ROM.

Yep. OEMs never design their own ECUs, it's all outsourced to suppliers like Denso, Delphi, Bosch, Magneti Marelli, etc. Look at the labels on any ECU, there will be a logo for the vehicle manufacturer, and a logo for the ECU manufacturer.

To the best of my knowledge, Denso supplies ECUs for all of the turbo Subarus and some of the N/A ones as well. On top of that Denso is a part of the Toyota Group, so it seems like a pretty safe bet that they supply the majority of Toyota/Lexus ECUs as well (I don't have any first hand knowledge though).

That agrees with what I know and what I said actually. It's isn't as simple as a Honda B series swap, aka plug and play, because the wiring is different but it's limited to cutting and splicing a few wires and extending the harness and still nowhere near as complicated as a completely unrelated ECU pinout.

I wouldn't know since I am not that knowledgeable about this but suggesting that ECUs are compatible simply because they come from the same supplier is not accurate.

Eg. even across a small manufacturer like Subaru the ECUs are not all designed to be compatible especially in different markets where they have offer different engines.

Am I right?

I never suggested anything of the sort. I simply stated that Denso supplies ECUs to both Toyota and Subaru, and will likely supply the ECUs for this new car.

I actually didn't mean to say that you were suggesting the ECUs were similar. You only said Denso was an ECU supplier.

I was talking in regards to similar ECUs and BCMs.