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Old 07-15-2015, 10:32 AM   #51
NITROS
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Just a little update.

I am now running the engine for approx. 4 weeks. This has been my first full week with the engine where I was able to drive the car and get some tuning in.

1) When I had race gas in the tank the engine was amazing. VirtualDyno chart was reporting 330 whp with a GT3076 rotated kit at 18 psi tapering to 16.

2) After the race gas went I've struggled to make any power without the car knocking. I had to turn the timing map way down, to go WOT without knock. Right now I am making about 250whp in its current form. Maf voltage seems a bit low to me at 4.3v on a 73mm intake. This could mean that I might have a restriction somewhere in the system. However, the 4.3v is on part with the race gas tune.

3) Outside of WOT cruise is absolutely amazing. the car feels really smooth.

Based on this thread: http://forums.nasioc.com/forums/show....php?t=1411812

I think the lack of power is due to the exhaust avcs (lack of) closing the valves too early.
This means that the valves are closing at 2* BTDC. This means I need to retard the exhaust about 7 degrees to get the valves to close at 5 ATDC. I will try to post graphs of my current overlap.

I am also looking into a arduino to control the Exhaust AVCS but need to learn a bit more about circuit design.
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Last edited by NITROS; 07-15-2015 at 11:27 AM.
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Old 07-16-2015, 10:35 AM   #52
dpenn
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Check this thread out:
http://forums.nasioc.com/forums/show...2582784&page=3

I did the ej20x swap and realized the cam timing is retarded when the avcs solenoids are disconnected. A combination of changing timing by moving the belt and adjustable cam gears are necessary to return the cam centerline to the same specs as a non-avcs engine.

How is your powerband? I have nothing until 4k rpm, then the car is a rocket ship.
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Old 07-16-2015, 02:53 PM   #53
NITROS
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Quote:
Originally Posted by dpenn View Post
Check this thread out:
http://forums.nasioc.com/forums/show...2582784&page=3

I did the ej20x swap and realized the cam timing is retarded when the avcs solenoids are disconnected. A combination of changing timing by moving the belt and adjustable cam gears are necessary to return the cam centerline to the same specs as a non-avcs engine.

How is your powerband? I have nothing until 4k rpm, then the car is a rocket ship.
Thanks for the idea, that should help. I'm not sure i will get to trying this as I'm going to try and build a standalone avcs controller. I'll have a progress thread here.

http://forums.nasioc.com/forums/show....php?t=2681374


Powerband is decent but disappointing on a 30r, i should easily be making 300whp. I get full spool about 4200 RPM which is the same as my 2.1 stroker did. I have the intake AVCS working but not the exhaust. I swapped in a STI harness and ecu to control that.

Last edited by NITROS; 07-16-2015 at 03:00 PM.
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Old 07-21-2015, 10:01 AM   #54
gto7419
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Sounds like your issue is tune related. I read your other thread - you aren't running enough boost and you are probably running too much timing...
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Old 08-10-2015, 11:28 PM   #55
garmani
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Default Forged internals??

So for the EJ20X engine does anyone know if the internals are really forged?
The engine in my 2005 usdm legacy gt blew and a shop wants to swap the JDM EJ20X in.
Also how is the quad avcs converted to work with a dual avcs ecu?
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Old 08-11-2015, 06:15 AM   #56
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Quote:
Originally Posted by garmani View Post
So for the EJ20X engine does anyone know if the internals are really forged?
The engine in my 2005 usdm legacy gt blew and a shop wants to swap the JDM EJ20X in.
Also how is the quad avcs converted to work with a dual avcs ecu?
Definitely forged rods and crank. And pistons are forged crowns.

Downside is open deck block (like ej205).

Converting to inlet only avcs is not that simple - dodgy way is to leave the exhaust cam gears locked but this will also place the exhaust cams in a resting state that is advanced.
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Old 08-11-2015, 03:31 PM   #57
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Originally Posted by dr20t View Post
Definitely forged rods and crank. And pistons are forged crowns.

Downside is open deck block (like ej205).

Converting to inlet only avcs is not that simple - dodgy way is to leave the exhaust cam gears locked but this will also place the exhaust cams in a resting state that is advanced.
I talked to a shop and they are going to do the conversion for me. They told me they cant really tell me the process of the conversion though?

If the pistons aren't completely forged, what is a safe WHP for the EJ20X? I was also told 300WHP is a reliable tune.
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Old 08-12-2015, 02:03 AM   #58
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I would tread with caution for anyone who can't tell you how the conversion will be done

300whp will be ok with a good tune, but just like with most things, who knows for how long

Mick
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Old 08-12-2015, 09:57 AM   #59
NITROS
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Just remember that the EJ205 are known to eat up rod bearings. You can also run the ej20x by setting installing non avcs cams or plugging the avcs holes, and then running a non avcs cam gears.
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Old 08-12-2015, 05:32 PM   #60
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Quote:
Originally Posted by NITROS View Post
Just remember that the EJ205 are known to eat up rod bearings. .
Which has absolutely nothing to do with the ej20x / y

The cranks and rods are not the same.

Only reason I even made mention of ej205 above was because of the open deck block design. That's the only thing they have in common with the ej205. And no they're not the same block. Just so happens that they're both open deck.
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Old 08-13-2015, 02:18 AM   #61
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Quote:
Originally Posted by garmani View Post
So for the EJ20X engine does anyone know if the internals are really forged?
The engine in my 2005 usdm legacy gt blew and a shop wants to swap the JDM EJ20X in.
Also how is the quad avcs converted to work with a dual avcs ecu?
I can't tell you what's inside one of these engines, but I can tell you that I would recommend using the JDM Legacy GT ECU. With a few wiring additions the dual AVCS can be made to work.
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Old 01-06-2016, 10:36 PM   #62
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I have a 2008 JDM WRX, known as S-GT or GH8

Supposedly using the EJ20X engine as well.

Is my block a open deck block as well?

What are the disadvantages to that?
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Old 06-20-2017, 01:04 AM   #63
Pokehatch062013
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[quote=dr20t;39122241]My EJ20Y quad avcs adm liberty (legacy) made 255awkw (350whp) unopened on e70

They're a open deck block, 9.5:1 static compression and forged rods/ crank

Edit : this was also through a 5eat auto so manual would see 370plus

Another guy down here made 270 awkw unopened.

What are the tuning options?
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Old 06-23-2017, 10:31 AM   #64
Mycarssweedish
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Default I dont know anything

So I'm considering dropping one of these into my impreza but the one I'm looking at doesn't seem to come with the original ecu. Can you use a usdm ecu on one of these or no?
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Old 06-23-2017, 12:40 PM   #65
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Originally Posted by Mycarssweedish View Post
So I'm considering dropping one of these into my impreza but the one I'm looking at doesn't seem to come with the original ecu. Can you use a usdm ecu on one of these or no?
Not really, in theory you could use just the long block if you had a way of deleting the AVCS. But if you wanted to use just the long block I believe a JDM ej205 would be a better option, but in that case it would still make more sense to just run the JDM ECU anyways.
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Old 10-19-2017, 05:41 PM   #66
itex
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Sorry to resurrect this thread.. but.. I'm currently swapping an EJ20Y into my 03 USDM WRX.

Was there a thread compiling what you guys did to get this to work?

I am interested in knowing what I have to do to disable AVCS without the adverse effect of messing up the timing (and therefore powerband). If this is possible, or not possible, and alternatives?

Worse case I should just be able to use my cams and gears from the usdm wrx correct?

Also, my wrx headers would bolt up to this engine correct?

I'm also interested in the way to get HVAC to work / what is involved / any info on that.
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Old 12-23-2017, 02:59 PM   #67
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I went through with it and got this engine.. FP blue with supporting mods. Kept conservative to not nade my tranny or engine



I'm very happy
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Old 12-28-2017, 04:56 PM   #68
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Quote:
Originally Posted by itex View Post
I went through with it and got this engine.. FP blue with supporting mods. Kept conservative to not nade my tranny or engine



I'm very happy
thanks for sharing, nice results. Reliable looking tune (flat tq and increasing HP). Hows the MPG, notice any improvements (being higher CR)?
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Old 01-01-2018, 07:45 PM   #69
itex
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Thanks! I do actually. Haven't quantified it but.. it definitely seems easier on the wallet now; highway cruises especially.
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Old 01-05-2018, 05:04 PM   #70
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Quote:
Originally Posted by itex View Post
Thanks! I do actually. Haven't quantified it but.. it definitely seems easier on the wallet now; highway cruises especially.
What headers did you go with? Is your dual avcs functioning? How does the reduced displacement feel? Very interested because I'll be swapping one in soon.
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Old 01-10-2018, 05:07 PM   #71
itex
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Quote:
Originally Posted by 2JZ View Post
What headers did you go with? Is your dual avcs functioning? How does the reduced displacement feel? Very interested because I'll be swapping one in soon.
I went with EJ205 headers (stock). The fitment of the turbo with this setup was pretty tight but def doable.

I came from a 2.0 so I don't know how to compare it to the 2.5..

AVCS is not working at the moment. My chasis is 03 so the ECUis 16bit. Making AVCS work how it should would require a new ecu with related canbus 32bit components.. Just don't have the time for it right now.

I hear these drop directly into usdm wrx08+ (only thing to look out for is the downpipe).
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Old 01-17-2018, 01:47 AM   #72
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Quote:
Originally Posted by itex View Post
I went through with it and got this engine.. FP blue with supporting mods. Kept conservative to not nade my tranny or engine



I'm very happy
What fuel were you using? Ive got an ej20x on my usdm LGT and from what i understand the compression ratio of 9.5:1 is a little high for the 92 octane fuel i have available in my area. Im tuned on the vf38 and made 240whp. Im going single scroll with a vf52 but im not sure if i should continue. How did you combat the high comp ratio?
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Old 01-17-2018, 09:35 AM   #73
itex
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Quote:
Originally Posted by Whodi View Post
What fuel were you using? Ive got an ej20x on my usdm LGT and from what i understand the compression ratio of 9.5:1 is a little high for the 92 octane fuel i have available in my area. Im tuned on the vf38 and made 240whp. Im going single scroll with a vf52 but im not sure if i should continue. How did you combat the high comp ratio?
I'm not sure how my tuner got around this exactly.. Detonation would have shown up if he went too far. I believe it was all timing and AFR based. I can tell the afr drops to about 10 under certain rpms+loads and then 11.5 is the target at high rpm.. so, there is some tuning mysteries there since it's a locked tune.

My tank was actually half NY 93 E0 mixed with NJ 93 e10 from a crappy gas station.

I've since grown weary of the crappy gas and stick to top tier premium now.. Pulls hard. I have an issue with backfiring and bucking right now which is probably due to a crapping-out MAF because it just started doing it..

Also, the power stays strong until 7500 rpm rev limiter. This particular run he didn't take it to the limiter, but, I saw the other runs.. it kept pulling until the end.
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Old 01-17-2018, 10:29 AM   #74
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Why did you choose this motor and not an ej205 ?
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Old 01-17-2018, 11:30 AM   #75
itex
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This motor has better oiling, better heads, is a newer revised design, and was used virtually unchanged into later years. It revs higher, it's cheaper, and has the potential for dual avcs if I ever get around to adding the appropriate ecu. it was available locally.

I personally like the higher compression.. call me crazy but I can feel a stronger engine braking.

Also it resembles more of the STI engines than the wrx engine of the era (02-07). The wrx engine 08+ is basically the same with a higher displacement block.
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