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Old 02-10-2006, 11:26 AM   #1
kheff46
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Smile v4 questions

what size are the header tubes id/od if anyone happens to know(assuming its still stock)?
would an ej20g closed deck block be a cheaper and still worthwhile block to use for a build? sorry bout another closed vs. open debate!
can i run usdm wrx headers(oem/aftermarket) if i had to stoop?
thats it! thanks if anyone has thoughts they'd like to share! -keith
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Old 02-10-2006, 01:44 PM   #2
Matt Monson
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Headers on the Ej20 engines are virtually unchanged since the dawn of time. Someone may come on here and debate the subtle nuances (like the special equal length factory units I have in my possession) but in short, there really isn't much difference. Any aftermarket header for a USDM WRX will work, but do your research. Until you are at some pretty high power levels they aren't worth diddly for power and are just a bling purchase...

Open vs closed also doesn't mean a damned thing. Either the V4 or V1 will be a good engine...
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Old 02-10-2006, 03:05 PM   #3
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thanks matt! i was hoping all engine acc. were in the same spot as usdm wrx/sti so i can just order one for that model. this was for the future mods anyhoo!
open/closed wasn't really the debate, moreso what kind of cheap replacement block would work as well if not a lil better(i've heard ej20k is harder to find). but that may be a moot point(ej257 is rejatively cheap) now. thanks again! -keith
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Old 02-10-2006, 03:23 PM   #4
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Quote:
Originally Posted by Matt Monson
Headers on the Ej20 engines are virtually unchanged since the dawn of time. Someone may come on here and debate the subtle nuances (like the special equal length factory units I have in my possession) but in short, there really isn't much difference. Any aftermarket header for a USDM WRX will work, but do your research. Until you are at some pretty high power levels they aren't worth diddly for power and are just a bling purchase...

Open vs closed also doesn't mean a damned thing. Either the V4 or V1 will be a good engine...
Oooo... what are the factory EQ headers off of?
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Old 02-10-2006, 03:56 PM   #5
Matt Monson
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The RS-RA. Some non-STi engines got them early on, but they were mostly STI units from the RS-RA through V2. But I have also found than not every early STI got them. It's is real hit and miss...
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Old 02-10-2006, 05:24 PM   #6
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post pictures of this equal length and non equal length thing. i wants to see.
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Old 02-10-2006, 05:33 PM   #7
Matt Monson
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Digi cam done plumb broke. There are some around here somewhere. I will see what I've got...
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Old 02-10-2006, 06:16 PM   #8
Matt Monson
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Here's a picture of one side. I can't come up with anything for the other side, but it has those long runners as well. It is a true 4-2-1 instead of the abbreviated 4-2-1 of most of the EJ20 headers. Most of them go from 4 to 2 immediately without any distance on the individual runners before they join up...
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Old 02-10-2006, 10:43 PM   #9
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I still need to put mine on. Do you see any advantage to having them ported? I am for sure going to get them coated but still out on the porting, lots of people offer it. any opinions?
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Old 02-11-2006, 12:14 AM   #10
THAWA
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Matt, it's not equal length. The left bank is still longer than the right bank, and they came on more than just STi's and RS-RA's, WRX's had them, as did Legacy RS's (Liberty didn't). We need to come up with a better name for them though, as calling them equal length is innaccurate and confusing. Tuned length might be better, as these were used for the higher RPM cars, the turbos hold boost longer, etc.


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Old 02-11-2006, 09:21 AM   #11
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supercool! any ideas what my v4'll come wih? superstar? i mean swapmoose? i'm lost -keith
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Old 02-13-2006, 09:49 PM   #12
THAWA
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I finally installed those manifolds. The aussies said they would slow spool up time, cause full boost later, and hold boost to a higher rpm. That's not quite what happened, the turbo spools sooner believe it or not. For a comparison when in 5th I used to floor it and have boost start to build between 2250-2500 rpms, and make full boost at 3000 rpms or thereabouts. Now in 5th the turbo starts to spool a little after 1875 and full boost is at 2500 rpms! Something else I noticed is when shifting, or any time when releasing and reapplying the throttle it does take slightly longer to reach full boost again.

The turbo also doesn't produce as much boost as before. I was able to get slightly more than 8 psi in 1st gear and a solid 9 psi in every other gear, now it hovers around 7 psi in 1st and slightly more than 8 psi in every other gear. Note the standard pressure is 8.7 psi.

Sound has changed aswell, the change isn't that noticable. To be honest you wouldn't be able to pick a car with these manifolds off the street. However, if you're changing your manifolds you'll probably notice it. The volume of the exhaust is slightly quieter, and more refined, but at the same time it sounds like it resonates more. It's kind of wierd to explain, but it's a cool sound. At idle it sounds as though the engine is at a higher rpm than what it actually is.

And one other quirky thing that happened was the idle. Before, I used to be able to pump the brakes and cause the idle to jump up and down. Now when I pump the brakes the same way the idle doesn't jump up or down, it just stays. Very wierd.

Overall, the manifolds are worth it, but then again these tests were done on an EJ22T with only a turboback.
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Old 02-13-2006, 09:51 PM   #13
THAWA
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I think a v4 has the regular manifolds.
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Old 02-14-2006, 12:13 AM   #14
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i looked at some, they kinda look like those manifolds. i couldnt really tell, heat shields still there.

from a V4 RA for reference
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Old 02-14-2006, 12:18 AM   #15
THAWA
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The heatshields are the same for all single scroll EJ turbos. If you look at the design of the tuned length and the regular length the mounting points are the same. You can't really tell from the heatshields which sucks.
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Old 02-14-2006, 12:41 AM   #16
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nerf. ive only seen the longer runner guys, never seen the short ones.

haha. mab my JDM og is more friendly than i thoughts.
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Old 02-14-2006, 01:04 AM   #17
Hurley 2.5 WRS
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thats why i said i cant see, the shields are still there and i dont have x-ray vision
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Old 02-16-2006, 02:08 PM   #18
kheff46
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are both these runners pictured the same ID? and same ID as the exhaust?

THAWA- the vaccuum is different, causing your funny brake issue. do you have a way to check the difference between them at your disposal? i'm interested in the actual pressure difference between the two tuned runners. -keith
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Old 02-16-2006, 03:04 PM   #19
Matt Monson
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Thawa,
I think you have got to be the most nit-picky peson on the board. I quote myself,"Some non-STi engines got them early on, but they were mostly STI units from the RS-RA through V2. But I have also found than not every early STI got them. It's is real hit and miss..." Now what about that really warrants correcting?

As for the equal length thing, i think that is still a fairly accurate description as well. The two pairs may not be equal length from side to side, but each individual pair on one side of the engine is equal length. But call it what you want. Your need to take it to the Nth degree just gets annoying as h3ll sometimes!
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Old 02-16-2006, 03:33 PM   #20
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Quote:
as did Legacy RS's (Liberty didn't).
bzzt the first pict is from my legacy/liberty gt engine (200ps version)
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