The 42Autosports 3.0RS (EZ30D inside)

[Donutz]

Just wanted to post up for my fellow nasioc-ers stage one of my ongoing Impreza build. The build started off as an STi swap for my 2007 2.5i but when I drove the Cannonball GTR (http://www.gtroc.us/forums/index.php...&mode=threaded) that was campaigned during the 2009 and 2010 One Lap of America, I knew I'd be shooting for a power levels that would not be reliable on a four cylinder powerplant. That is how my 3.0L Impreza came to be.

The powerplant in question is the EZ30D out of the 2001-2004 Outback L.L. Bean. The current motor is a "get the car up and running deal" it's a bit high mileage at 17XXXX miles but it still runs like a champ, putting down 175 at the wheels on a Dyno Dynamics with a full exhaust, intake and Haltech stand alone (they were rated at 212 crank from factory, and that 175 equates to about 200 at the wheels on a DynoJet or about 250 at the crank).

The reason for a slightly higher mileage motor is that the timing chain EZ30s are built like tanks and they don't suffer much from aging (not to mention it has been puttering around for the last 9 years (donor car was an 01 Outback LL Bean). Though this is only a temporary solution, we're going to acquire a core motor (once a six speed makes it way into the car of course) and build it with forged pistons and rods (the 2.0L WRX pistons will fit in the EZ30) and do a twin turbo setup, though that won't be coming to fruition for another year(ish).

Now for the pics and dyno video:

the car in question


The motor (a little dirty, it got cleaned up some before it went into the car)


The motor in the car at the Charlotte Auto Fair


The dyno video

YouTube - 42 Autosports EZ30 Impreza.wmv

YouTube - 42 Autosports EZ30 Impreza.wmv

Dyno plot


I'll continue updating this thread with new videos/status updates, the car's already been out to an autocross and did pretty well, compared to a VF52'd WRX it ran slightly quicker times (prep levels were similar, the 3.0 may have had better brakes/wider rubber) and it felt as if it had the peak torque of the 52'd car all over the rev band.

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[Patrick Olsen]

Originally Posted by Donutz

The powerplant in question is the EZ30D out of the 2001-2004 Outback L.L. Bean. The current motor is a "get the car up and running deal" it's a bit high mileage at 17XXXX miles but it still runs like a champ, putting down 175 at the wheels on a Dyno Dynamics with a full exhaust, intake and Haltech stand alone...

That's pretty impressive! When you say "full exhaust", what exactly are you guys running? I see on the dyno graph that it says OBX header, so I get that, but what about the rest. Is the exhaust 2.5" all the way back or bigger than that?

What sort of tweaks to the tuning have you done that gets that much more power out of the engine? Or do you think it's just a matter of letting it breathe better with the intake and exhaust?

Are you using the variable intake plenum at all? I'd be curious to see what (if any) difference it makes in the torque curve using it vs. not using it.

Originally Posted by Donutz

... build it with forged pistons and rods (the 2.0L WRX pistons will fit in the EZ30) ...

I think you might want to second check that. There's a reason Perrin, PDX, etc had to have pistons made.

Pat Olsen

[Dodik]

very interesting results, can you tell more about the exhaust very interested as i have 02 H6 mostly stock just for your reference stock motor in stock drivetrain (4eat) put out 156whp and 160 torque. which transmission are you using right now?

[Donutz]

1) Ya not exactly sure if the pistons are interchangeable, just one little rumor deal we heard though we're gonna play with things before it's settled so we're gonna look into it (play = try mixing 3.6 and 3.0 stuff lol).

2) The transmission is the 2.5i stock 5 speed, albeit with an Exedy Stage 1 organic meant for a WRX

3) The wrx is the OBX headers mated to a 3" SPT catback (the bosal unit) that had the flange rotated to mate to the OBX headers. The car is also running a standalone which is where some of the power gains are (along with it being catless etc etc).

As far as what's being intake wise used its just the stock H6 motor and intake plenum (with vibrant piping and an aem dryflow on it, short ram-esque).

[Patrick Olsen]

Originally Posted by Donutz

1) Ya not exactly sure if the pistons are interchangeable, just one little rumor deal we heard though we're gonna play with things before it's settled so we're gonna look into it (play = try mixing 3.6 and 3.0 stuff lol).

The bore on the EZ30 is not the same as the EJ20 (89.2mm vs. 92mm). Unless you can cram 3mm larger pistons in there, it ain't gonna work. The EZ30 has no commonalities with the EJ engines, AFAIK (unlike the EG33, which shared a number of parts with the EJ22). The EZ36 is also very different from the EZ30, particularly the first gen non-AVCS version of the EZ30.

Originally Posted by Donutz

3) The wrx is the OBX headers mated to a 3" SPT catback (the bosal unit) that had the flange rotated to mate to the OBX headers. The car is also running a standalone which is where some of the power gains are (along with it being catless etc etc).

Gotcha.

Originally Posted by Donutz

As far as what's being intake wise used its just the stock H6 motor and intake plenum (with vibrant piping and an aem dryflow on it, short ram-esque).

Right, I could see that in the pictures. My question is whether or not you're using the variable intake plenum IRIS valve, which splits the plenum of the intake manifold in half when it's shut. The SVX intake manifold has the same thing. It's supposed to broaden the torque curve. I believe it's supposed to be shut at low RPM, splitting the intake manifold in two so you have two smaller plenums and improving low RPM torque and response, then open at ~4000rpm to enlarge the plenum for better top end. Your torque jumps pretty good at ~4000rpm - I wonder if you could beef up the <4000rpm curve if the IRIS valve was used.

Pat

[42Autosports]

Pat,

Good questions about the setup. About the pistons, you are correct about the 2L pistons - there are some other options out there that we are looking at for the build. We are currently looking for a good 'core' motor for the build. At this time, it's not a huge rush, as Donutz has to get a 6spd in the car first.

As for the IRIS valve, currently it is not in operation, although that's the next thing to be tested. We also need to do some intake testing, as the stock torque box and filter on a stick were just the quick and easy solution to get the car up and running.

Glad to see you still have your Legacy GT, I miss my Luxobarge!

Steven

[Patrick Olsen]

Originally Posted by 42Autosports

As for the IRIS valve, currently it is not in operation, although that's the next thing to be tested. We also need to do some intake testing, as the stock torque box and filter on a stick were just the quick and easy solution to get the car up and running.

Cool. If you get any dyno comparison graphs, post 'em up! I'm curious to see what a difference it makes.

Pat

[aesthetect]

bump

gettin interested in ez30ds... curious what all you got out of it while still NA

[Donutz]

funny you should ask we're just finishing up the next iteration of the build with a built (or near built) EZ30 with factory 5 over pistons, Supertech valve springs, a valve job and some decking. We'll post with results when we get them, the car's going to be stout....(and a rocketship at 2600 lbs)

you can also check us out on facebook: www.facebook.com/42autosports

[aesthetect]

awesome thats just what i was hoping to hear -- bumping compression at all? any thoughts on cam options for the EZ30D? what about headers?

[TurboLag23]

Hey, how hard was it to hook up the 5MT to the EZ30D? Was there any work involved custom-fitting, or did it bolt right up?

Basically, I'm thinking of doing a trans swap into my OB, and I wanted to know any pitfalls that may arise ahead of time.

Thanks.

[bigolrig]

nice job!

[Patrick Olsen]

Originally Posted by TurboLag23

Hey, how hard was it to hook up the 5MT to the EZ30D? Was there any work involved custom-fitting, or did it bolt right up?

Basically, I'm thinking of doing a trans swap into my OB, and I wanted to know any pitfalls that may arise ahead of time.

The 5MTs and 6MTs will bolt right up to the EZ engines.

[TurboLag23]

Originally Posted by Patrick Olsen

The 5MTs and 6MTs will bolt right up to the EZ engines.

Perfect, thanks!

Now time to save up some money! hahaha