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Old 08-04-2013, 04:36 PM   #1601
Patrick Olsen
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You would have to do some harness merging, since the Impreza/OBS never had the 6-cyl and thus the wiring to the climate control, instrument cluster, etc will be different between the two cars.
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Old 08-04-2013, 07:20 PM   #1602
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Has anyone does this sort of swap before, that can give me some pointers? It seems like most H6 swap threads are about EG33s in GCs.
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Old 08-04-2013, 08:17 PM   #1603
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i'm doing it right now. the engine bay harnesses are virtually identical, and the rear harnesses are. the bulkhead ones are not, however virtually of the plugs (e.g for the cluster) are exactly the same.

in other words, you can swap the bulkhead harness and plug it straight into virtually everything. you just can't use the EJ bulkhead harness with the H6. i posted links/images about all of this previously.
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Old 08-04-2013, 08:20 PM   #1604
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I glanced through it - is it actually running ok?
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Old 08-04-2013, 08:23 PM   #1605
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no idea yet

if you have a donor car, you'll need at minimum the bulkhead and dash harnesses. the one that does a big lap around the engine bay to the headlights etc i'm not sure about yet - it's 98% identical to the ej ones but little things like park lights or something may not work. the rear harnesses are all the same, 6, 4, whatever. all the harnesses just plug straight into one another though
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Old 08-05-2013, 10:50 AM   #1606
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Mine is running great, but now deciding on what combination of exhaust elements. Currently the OBX headers to the stock mid-pipe with the micro resonator, into a Stromung WRX cat back. Looking into a single high flow cat and maybe a large resonator to deepen the tone. Also have the intake machined from aluminum or billet.



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Old 08-05-2013, 06:00 PM   #1607
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that inlet is terrible. tiny filters and air from either side will crash against each other and disrupt flow.

change it to a single pipe, smooth bends, one filter.
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Old 08-05-2013, 07:04 PM   #1608
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Quote:
Originally Posted by vicious_fishes View Post
ah. well you never told us that. in that case i'd just supercharge an ej25 assuming you're trying to find something with more lowdown torque. loads of guys on rs25 have done it. tell us what you're trying to achieve and we can help you much better.
I don't own an Impreza anymore and I'm never owning an EJ2xx again.
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Old 08-05-2013, 08:02 PM   #1609
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Quote:
Originally Posted by OrbitalEllipses View Post
Uh. Boost vs engine swap is the question...so less than $7K? Pipe dream really.
Could be done. Depends on how much "other stuff" needs to be done to make it work in the new platform. You'd be breaking new ground, which typically isn't cheap.

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Now I'm seeming to remember an earlier conversation about the Subaru engines other than the FA not mating to the bell-housing of my Aisin trans.
Can't help you there.

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I'll have to read more, but EZ36R is the Legacy 3.6R and Tribeca powerplant right?
Yes.

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"Output: 256 hp @ 6,000 rpm, 247 lb-ft @ 4,400 rpm" Must rev higher and needs 100 more hp...these stock numbers are about the wheel output of a very well tuned up twin-screw supercharger with supporting modifications.
Basically, there's not a whole lot of data out there about "built" N/A EZ30s or EZ36s. Personally, I would say it's unlikely that you will see the same output out of a N/A EZ30 or 36 that you would out of a forced induction FA20 (or whatever the new designation is). I think it's safe to say you could get more than the factory output from one (with a proper intake setup, proper headers, better tuning), but I don't know that you could get the ~50bhp you would need to match the FI FA20. On the other hand, the sexy 6-cyl growl from a BRZ/FR-S would be pretty badass.
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Old 08-05-2013, 11:00 PM   #1610
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Quote:
Originally Posted by vicious_fishes View Post
that inlet is terrible. tiny filters and air from either side will crash against each other and disrupt flow.

change it to a single pipe, smooth bends, one filter.
This is a tester, not the final...the final being machined by aluminum or billet. By FAR not too small of filters...the EZ30 needs a bit of restriction to keep torque...inside the tube are contoured directional pieces that direct the air into the TB, it's not just open and flow isn't crashing...cool air being drawn in by the scoop and below (which isn't in this photo) is an aluminum head shield keeping the heat at bay.

If it was just me I'd doubt my ideas, but this car was done by Subaru.
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Old 08-06-2013, 04:28 AM   #1611
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Quote:
Originally Posted by RallyGuy2k View Post
This is a tester, not the final...the final being machined by aluminum or billet. By FAR not too small of filters...the EZ30 needs a bit of restriction to keep torque...inside the tube are contoured directional pieces that direct the air into the TB, it's not just open and flow isn't crashing...cool air being drawn in by the scoop and below (which isn't in this photo) is an aluminum head shield keeping the heat at bay.

If it was just me I'd doubt my ideas, but this car was done by Subaru.
restriction to keep torque... that doesn't make sense?

your car dude but, a single fat filter would be the way i'd go...
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Old 08-06-2013, 06:57 AM   #1612
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Quote:
Originally Posted by RallyGuy2k View Post
By FAR not too small of filters.
I'm not sure I'd say "by FAR", but I would guess those 2 filters combined have more inlet area than the stock filter would.

Quote:
Originally Posted by RallyGuy2k View Post
the EZ30 needs a bit of restriction to keep torque...
I'm with vicious, that statement makes no sense whatsoever.

Quote:
Originally Posted by RallyGuy2k View Post
If it was just me I'd doubt my ideas, but this car was done by Subaru.
"Done by Subaru" how? It's a swap into a car that never had that engine, using an intake design that was never used from the factory with that engine (or any other Subaru engine, for that matter). The fact that the work was done at a dealership doesn't mean it's the best solution.
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Old 08-06-2013, 08:25 AM   #1613
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I mean its a better solution than I could come up with.
Yeah the filters are providing more than the stock and that's all I'm looking for. I used to run a large k&n on it as a 2.5 and it was meh. The fozzy has a k&n in the stock box with a gantz into the fender, and the ll bean has been played with but wide wants it quiet.

Subaru/Fuji corporate will be going over it today in Houston so I'm curious what they think. All I know is that is exactly what I wanted from when I got it in 2000....just took 13 years to have it done.
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Old 08-06-2013, 08:31 AM   #1614
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Quote:
Originally Posted by vicious_fishes View Post
restriction to keep torque... that doesn't make sense?

your car dude but, a single fat filter would be the way i'd go...
Back when we were modding the 2.5RS we did straight filter to the TB but we lost our torque... same with running open exhaust. We used the stock box with a k&n with a gantz and has better luck... or oz course run the filter in the fender.

Same with the exhaust. They have open track exhaust...obx to track pipe to stromung and is loud and raspy...good pull up top but lacks down low...we put a stock H6 cat and the low end improved nicely. It needs some back pressure to keep the low end so they're putting a hiflow cat and a 22" resonator with the stromung. At least the sound will be a bit more toned down.
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Old 08-06-2013, 10:35 PM   #1615
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that's what N/A tuning is. but the lowdown power isn't created by restricting the flow to the intake. it's having that fat reservoir of air in the inlet box. he has both removed that reservoir AND has air clashing from either side with tiny little inlets. i'd wager it's worse than stock.

Last edited by vicious_fishes; 08-06-2013 at 10:40 PM.
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Old 08-06-2013, 10:45 PM   #1616
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After 13 years of being here, I don't e-thug or e-argue.
Instead of arguing I'd rather agree to disagree.








...or we can compare bottom line scca autox or rallyx championships. ; )
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Old 08-06-2013, 11:12 PM   #1617
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On the bright side, Subaru vice pres Jay Shoji and marketing manager Hideyuki Nakabayashi checked out how it came out and took more cell photos than I've taken. They dig the H6 following.





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Old 08-07-2013, 12:16 AM   #1618
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Quote:
Originally Posted by RallyGuy2k View Post
After 13 years of being here, I don't e-thug or e-argue.
Instead of arguing I'd rather agree to disagree.
...or we can compare bottom line scca autox or rallyx championships. ; )
we're not being e-thugs mate. we're trying to help him.

my old man is the same as this, can't tell the difference between someone trying to help him/telling him something for a reason and just ripping into him. this is the former. it makes no difference to me what is done.
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Old 08-07-2013, 10:44 AM   #1619
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right on man. It's probably too much time in OT. lulz

On a side note, the RS 5sd tranny isn't bad but 1st gear is useless...easier to start in 2nd. A STi 6 would be nice.









I need to build up my stash again so wife doesn't know.
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Old 08-07-2013, 08:47 PM   #1620
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Originally Posted by RallyGuy2k View Post
right on man. It's probably too much time in OT. lulz

On a side note, the RS 5sd tranny isn't bad but 1st gear is useless...easier to start in 2nd. A STi 6 would be nice.

I need to build up my stash again so wife doesn't know.
you have a stash of gearboxes?
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Old 08-08-2013, 08:42 AM   #1621
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I just realized that when the cage is in, the dash bar isn't coming out again. Is it possible to swap the harness without removing the dash bar? I don't have the donor car yet, so I didn't want to start pulling anything until I did (just in case I don't have it but still want to run an event).
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Old 08-08-2013, 06:48 PM   #1622
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every dash swap i've ever seen has needed the corresponding dash bar too.
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Old 08-08-2013, 06:51 PM   #1623
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I'm not swapping dashes - just the wiring harnesses.
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Old 08-08-2013, 09:03 PM   #1624
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oh then no. the harnesses don't have to bolt in exact place like the dash does. hell just ziptie it if you have to.

in other news, i was just told that the BRZ and the H6 share the same crank pulley. so if you want a light one, just buy a BRZ one. a search of "brz pulley" in ebay gives plenty of results.

i'm quite happy with this news

Last edited by vicious_fishes; 08-09-2013 at 01:50 AM.
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Old 08-13-2013, 08:47 AM   #1625
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Quote:
Originally Posted by Marnix View Post
DAXABB is the first 'batch' of EZ30D engines for the USDM market.

Here's a picture I found browsing through Google of that first EZ30D:



You can see the tiny pockets for the valves.
alright so how do these engines fire? i'm having a debate with a mate about the appropriate size for the header primaries to be. he reckons no more than 1.75 inch like on the ej's but i was under the impression that you at some point get two pistons per bank firing at the same time, hence needing the larger primaries like on the OBX header.

basically, i thought the engine rotated like this:



but your pic above obviously disproves that. soooo... what's the skinny?
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