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Old 02-06-2005, 11:45 AM   #1
DuoMaxwell
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Default Your opinions on EJ20G heads vs the rest

Ok I have just about had enough of the misinformation on the EJ20G RA (not HLA) heads vs everything else. I want your tuning facts and no I dont care jack squat about so and so from so and so tuning says as I have been tuning these engines 4 years after they were released. I have every publication from every tuner as of a year ago in Japan(due to v8) and every Suby manual up to and including a V8. I have spent the last week studying and reading every possible angle of the heads and block indepth. Edit: I am stil somewhat lost.

I need to know what facts you guys have and no I don't give a rats butt what so and so says from so and so tuning they have not ran a 56 sec lap time. I need your honest to god truths as I have just ran the dyno on the Ej20G with a 2.2 stroker and the HKS 2835 pro v7 heads and ver 2 heads in the past week.

Here is the question
Where do the Ver 7/8 heads perform better than ver 2 ra heads??
Keep in mind the difference points in favor of ver 2 heads.

Edit: Please read my second post prior to posting.
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Last edited by DuoMaxwell; 02-06-2005 at 12:58 PM.
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Old 02-06-2005, 12:17 PM   #2
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What I want to know is what's with the hard on for EJ20G's all of a sudden.

So it's closed deck, so is the old legacy EJ22's and you get some extra displacement. Granted, I haven't really been paying attention, but I haven't heard of any big power numbers from somebody running an EJ20G. Course, I imagine with your mods you may have some.

Last edited by AKGC8; 02-06-2005 at 12:24 PM.
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Old 02-06-2005, 12:56 PM   #3
DuoMaxwell
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Its not a hard on but I expected it to be in favor of the ver 7 heads. I will post some charts when both tunes are considered to be at the best settings. The way it looks right now there is a slight difference in the early part of the pull in favor of the V7 but later on in the end the V2 wins. I am doing everything I can to figure this out but I am at a loss, there are alot more knowledgable/smart people when it comes to cams and flow than I am. The overall difference is an average of 12awhp and I am trying to figure out why.

No AVCS is not used with this set-up, aftermarket cams were in affect.
Injectors are the same 820cc
The big differences are the sensors on the intake manifolds and the manifolds themselves!!!

Someone please I need to know what I am missing or in otherwords something is just not adding up.
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Old 02-06-2005, 03:23 PM   #4
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I thought all EJ20G's were non HLA except the legacy EJ20G's ?

Also just to be sure since i just found out HLA means hydrolic lifters right?

Last edited by scobaru; 02-06-2005 at 03:38 PM.
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Old 02-06-2005, 05:14 PM   #5
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u want to buy some EJ20G heads? i got some...u want u PM me ...
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Old 02-06-2005, 06:13 PM   #6
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which way is the 12 hp towards? the V7?
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Old 02-06-2005, 06:42 PM   #7
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Intake ports on a JDM V7 head is bigger than the older V2/3/4 . Before the V7 came out, I know all the guys in Oz/UK we using EJ20G blocks and V6 heads. For the same reason that the V6 heads flowed more better than the earlier ones.
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Old 02-06-2005, 07:32 PM   #8
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Most Ver 7 heads are junk! Just a usdm wrx head casting. Only advantage to them is valve train and cam. Spec C is a different story! http://forums.nasioc.com/forums/showthread.php?t=709729

How about some pics of the early RA heads. From what I have seen in the later versions 5-8 anything with RA means bigger ports then normal STi.

Small port ver 7 heads I would suspect to dyno just like you found, more low end power but falling off at high rpms compared to a large port RA head.

Last edited by Scoobie Steve; 02-06-2005 at 07:49 PM.
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Old 02-07-2005, 12:16 AM   #9
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Hurley overall on top the Ver 2 heads have about 12.

Scoobie Steve thanks for the information, this probably is the reason for my confusion. I will post up some pics within the week!!
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Old 02-07-2005, 12:39 AM   #10
snowman4us
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Quote:
Originally Posted by Scoobie Steve
Most Ver 7 heads are junk! Just a usdm wrx head casting. Only advantage to them is valve train and cam. Spec C is a different story! http://forums.nasioc.com/forums/showthread.php?t=709729

How about some pics of the early RA heads. From what I have seen in the later versions 5-8 anything with RA means bigger ports then normal STi.

Small port ver 7 heads I would suspect to dyno just like you found, more low end power but falling off at high rpms compared to a large port RA head.
JDM AVC...is there even an argument...once the valve timing turns on there is no comparison. and im sure if u put on some more aggresive cams on the ver.7's they would flow like a chav. 350.

my .o2
but what do i know


kirill
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Old 02-07-2005, 12:47 AM   #11
Scoobie Steve
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You missed post #3 AVCS is not nearly as wonderful as its made out to be. I have seen dynos of about 10 ftlb of difference. Suby heads outflow all production GM heads... and most aftermarket ones too

Last edited by Scoobie Steve; 02-07-2005 at 12:53 AM.
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Old 02-07-2005, 01:33 AM   #12
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yeah, i bet the heads they were using were plain V7's. also, i bet the ej20g heads have a higher port velocity. the different parts (manifold, valves, cams, and so on) probably work better as a whole, giving it that 12hp.
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Old 02-07-2005, 05:01 AM   #13
DuoMaxwell
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Thanks for your insight so far guys, I have the engine back out and we are gonna do some more tuning and tweaking.
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Old 02-07-2005, 08:25 AM   #14
snowman4us
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w/ the ver7 heads u can have the low end torqe and high end HP...i would be willing to sacrafice 10-15lb.tq.(or HP) up top to have the power down low...

after im done working on this WRX im going to get some EJ20G heads and take a closer look at them. im going to messure the Comb. Cham. and see how it compares to the EJ205 and see how mutch diff. the ports and what not looks. ill post my findings on the coversion forum...

kirill
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Old 02-07-2005, 10:02 AM   #15
DuoMaxwell
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Cool snow when you do it let me know what you find out.
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Old 02-07-2005, 01:54 PM   #16
snowman4us
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it wont be for another week or so...but from what i have read on the net, the EJ20G has bigger Comb. Chamber then the USDM ej205.
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Old 02-07-2005, 03:01 PM   #17
Jaxx
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interesting
i started comparing some the cam profiles seems that there is quite a difference

Code:
                legacy--legacy RS--A/B/C IMP--STI ver1--STI ver2--ej20k
Lift IN/EX      8.0/8.0   8.0/8.0   7.5/7.5   7.5/7.5   7.5/7.5  8.2/8.3
IN  open/close    2/48      2/50      6/56      6/56      6/56    10/56
EX open/close    51/5      46/10     55/11     55/11     55/11    12/56
i wish i had a 205 profile to compair it to

the "G" designation is just to vague
the plain legacy GT left side of the colum is by far the most comon

Last edited by Jaxx; 02-07-2005 at 03:13 PM.
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Old 02-08-2005, 12:23 AM   #18
Ver.III
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The 98 RS DOHC heads looked identical to my V3 and a set of early EJ20G heads from a 96 Sti RA . That includes the combustion chamber. Only difference with the NA heads was the valve gear and the oil drain hole that was used for the turbo was blocked.
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Old 02-08-2005, 02:11 AM   #19
Hurley 2.5 WRS
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well, if youre right^, that means they flowed great, especially if you look at the era.
anyone have the cam profiles for the 205 and 7? also, are the EJ20K STi RA cams a different grind than the regulars?
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Old 02-08-2005, 09:51 PM   #20
snowman4us
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suposedly the EJ20G heads will outflow a good amount of other scooby heads w/ a more aggresive cam
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Old 02-09-2005, 01:05 AM   #21
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sweet sooo I could get my head's port and polished with some better cams and away we go? do any EJ cams work?? which ones would be good to use?
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Old 02-09-2005, 08:28 AM   #22
snowman4us
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im not sure on what cams you could use thow...if im not mistaken the EJ20G has hydro. lifters. so you could maby use the cams of another EJ that has hydro lifters...
if you can find any, there are plunty of companies that will make custom cams for about the same price of aftermarket cams. u just have to tell them the specs, and thats the hardest part.
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Old 02-09-2005, 09:06 AM   #23
DuoMaxwell
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Yea or you can a pay out the ying yang for the first set for a EJ207 then 2 get real lucky and come across some for an EJ20G on yahoo japan auctions. Total cost was 2k man Jun is killing me!!!
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Old 02-09-2005, 10:34 AM   #24
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legacy EJ20's are hydrolic lifters. Impreza EJ20G's arn't hydro soo around 94+ wrx's?
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Old 02-09-2005, 10:54 AM   #25
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Quote:
Originally Posted by scobaru
legacy EJ20's are hydrolic lifters. Impreza EJ20G's arn't hydro soo around 94+ wrx's?
huh?
yes they are
what about the 92 and 93 imprezas ..
also missing that the imp wagon still had the G for another 2 years

the only ej20G w/o hydro lifters was the sti ver 2

i wonder if the jun cams are compatable with legacy heads?
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