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Old 10-01-2010, 12:48 PM   #1
42Autosports
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Default 42 Autosports 2001 2.5RS H6 Swap - EZ30D Inside!

Ben's car is too nice to leave as a foot note in the thread about Josh's car so we decided to give his car it's own thread.

As our first GC guinea pig he deserves some forum love.

Adam prepped the engine for it new home.


We bolted on some clutch goodies - A Prolite Flywheel and Exedy Stage 1 Clutch.


Slowly...


The H6 looks right at home in the GC engine bay.


It's a tight squeeze, but it fits.


The OBX Header almost fits perfectly. One chop and a weld to Ben's old catback and it will breathe freely.


We'll have to notch that one brace but other wise the OBX Header is a perfect fit.



Stay tuned for future updates as we finish the wiring and get her up and running!

-Miles
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Last edited by 42Autosports; 12-02-2010 at 12:36 PM.
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Old 10-01-2010, 06:00 PM   #2
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looks awesome.
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Old 10-02-2010, 08:45 AM   #3
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Here's the other recent thread about another 42Autosports EZ30 swap. Good stuff! I'm looking forward to more info.

Pat Olsen
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Old 10-02-2010, 08:05 PM   #4
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Why the older EZ30???
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Old 10-03-2010, 12:40 PM   #5
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Here's one reason.



Other than that it's also very affordable and unboosted it's dead nuts reliable. We are looking into better internals and the goal is a twin turbo EZ30D for Josh's and/or Steven's car, who knows where we'll go from there.

We have tested an EZ30R on our dyno and we noticed it's torque curve is flatter and it may have more potential in the long run but it's also hard to come by one for a reasonable price. The EZ36D is an engine we'd love to have in one of our Imprezas but right now they are cost prohibitive.

-Miles

Last edited by 42Autosports; 12-02-2010 at 12:36 PM.
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Old 10-03-2010, 01:36 PM   #6
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The D isn't actually as reliable as the R or the 36. I've seen quite a few come in for major work.

Plus they are single port heads, which sucks. I would actually do a EG33 over that motor and get more power with a simpler ECU situation.

But thats just me... Anything is better than the N/A EJ25 for power anyway.
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Old 10-03-2010, 05:42 PM   #7
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Quote:
Originally Posted by Kostamojen View Post
The D isn't actually as reliable as the R or the 36. I've seen quite a few come in for major work.

Plus they are single port heads, which sucks. I would actually do a EG33 over that motor and get more power with a simpler ECU situation.

But thats just me... Anything is better than the N/A EJ25 for power anyway.
There are always exceptions to the rule, but with 190K+ now on the motor in Josh's car and running strong, and the fact that I have talked to numerous Subaru techs who have never had the opportunity to tear into one of those motors because they have never seen one broken says a lot about the reliability of the motors.

I think the 'single port heads suck' statement is a little overused. Are they as good as the triple port heads on the R motors? No, but they hardly suck. In fact, unless someone can show me flow-bench results of the heads I am kind of tired of hearing about how bad they suck. Not trying to be a jerk, but people state all the time about how they suck, yet I have never seen direct scientific data to prove what the difference is between the two.

The EG33 is a cool motor no doubt, but our direction is to develop swaps and parts that work well with motors that are cheap now (EZ30D) and will work with motors that become cheap in the future (EZ30R & EZ36R), hence our starting with the EZ30D.

Steven
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Old 10-03-2010, 10:07 PM   #8
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Well, it sucks cause it doesn't sound nearly as good as the tripple port

So far, every single port head Subaru has made has been worse in terms of power capability...

EA63 dual port vs single port: dual port makes more power
EJ22 dual port vs single port: dual port makes more power
EJ25 dual port vs single port (04-05 Legacy PZEV): dual port makes more power
EZ30 triple port vs single port: dual port makes more power


But the big thing IMO is that EZ30 is still more reliable than the turbo motors and more power than the EJ25, and if it really is that cheap then its a good option for sure.
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Old 10-04-2010, 12:05 AM   #9
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nice stuff guys. The EZs will catch on like crazy in time, for they are easier to swap and emissions compliant.
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Old 10-04-2010, 07:23 AM   #10
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Originally Posted by Kostamojen View Post
Well, it sucks cause it doesn't sound nearly as good as the tripple port
I will give you that I do ponder the sound differences - our '07 2.5i with the EZ30D has some low end noises that I don't like, but it sings very nice above 4k rpm. We are taking the car to an exhaust guru later this week to see if he can help us get the sound just right though.

The single port heads on the D are going to make it very easy to strap a turbo on each bank though.
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Old 10-04-2010, 10:58 PM   #11
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The single port heads on the D are going to make it very easy to strap a turbo on each bank though.
This is true.

6 ports into a turbo is... Difficult.
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Old 10-06-2010, 10:27 PM   #12
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great work guys. this is far more interesting to me than a turbo EJ swap. seems like a great mix of affordability and a "fun" level of reliable N/A power with lots of potential down the line if one chooses to turbo. there's just something about a stout, medium displacement 6 cylinder engine that's appealing for street and track use. and the sound...oh that sound.

do you foresee developing a wiring harness to be used with a particular EMS solution? being untalented with anything wiring-related, my dreams of an H-6 swap always hit a wall when i hear about how difficult and expensive it is to modify harnesses AND remain emissions compliant.

keep us updated! i'm in NC as well so i may need to come visit and see it for myself at some point
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Old 10-12-2010, 11:10 PM   #13
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looks good
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Old 10-22-2010, 05:32 PM   #14
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New pics of Ben's car.




The nose returns! It looks like a complete car from the outside again!!




Some of the interior has made it back in the car too.

We're finalizing some of the wiring before we put the front seats back in the car.

Right now she runs and sounds great!

We'll keep you posted as it gets closer to completion.

Miles
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Old 10-23-2010, 12:58 PM   #15
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Quote:
Originally Posted by Kostamojen View Post
This is true.

6 ports into a turbo is... Difficult.
Thats the nice thing about the 3.3 exhaust manifold. Other then being restrictive, all three ports go into one.
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Old 12-02-2010, 12:39 PM   #16
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Kind of a late update but Ben's car is on the road and has been seeing some daily driving duty from him for the past few weeks. I've seen the car around town and other than the exhaust note it's a total sleeper. Pretty soon we'll have GC 3.0RS #2 on the road, see this post for more details.
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Old 12-02-2010, 05:23 PM   #17
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the videos!!!!!
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Old 12-03-2010, 07:19 PM   #18
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Looks sweet!
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Old 12-04-2010, 12:19 AM   #19
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Looks nice, definitely liking the swap
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Old 12-04-2010, 03:41 PM   #20
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IBthinkingcams
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Old 12-04-2010, 05:37 PM   #21
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Quote:
Originally Posted by ScottyB View Post
great work guys. this is far more interesting to me than a turbo EJ swap. seems like a great mix of affordability and a "fun" level of reliable N/A power with lots of potential down the line if one chooses to turbo. there's just something about a stout, medium displacement 6 cylinder engine that's appealing for street and track use. and the sound...oh that sound.

do you foresee developing a wiring harness to be used with a particular EMS solution? being untalented with anything wiring-related, my dreams of an H-6 swap always hit a wall when i hear about how difficult and expensive it is to modify harnesses AND remain emissions compliant.
The first swap they did (the 2007 2.5i that I linked to earlier in this thread) used a Haltech computer. Not sure what they're using in this car, but anders8 installed an '01-04 EZ30D in his rally car and used the stock (EZ30D) ECU. I'm assuming one could maintain emissions compliance doing that, but I don't know. (anders8 was building a rally car, so emissions compliance didn't really matter in his case.)

Quote:
Originally Posted by Homemade WRX View Post
IBthinkingcams
I really would be interested in seeing what one of these engines could do with some cams reground by Delta or whoever. Obviously the single port design isn't going to help the ultimate power potential, but I'm sure there are gains to be had. A 212hp 3.0L isn't exactly a high stress motor, so there's probably some potential waiting to be extracted.

Pat
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Old 12-04-2010, 07:04 PM   #22
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yeah, acid porting the single ports my be a viable option. Never seen them so I don't know tooling one can get into the ports.
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