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Old 09-01-2005, 11:53 AM   #1
Suberman
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Default how to see if engine has AVCS??

How to see if its an AVCS equipped engine??

with a popped bonnet, is it possible to see if its a JDM EJ207 or a EDM EJ207??
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Old 09-01-2005, 12:01 PM   #2
Davenow
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teh numbers on the engine. Get them, post them.

Or look at the heads/cam pullies.
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Old 09-01-2005, 01:06 PM   #3
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Look for the avcs solinoids..
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Old 09-01-2005, 02:12 PM   #4
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Quote:
Originally Posted by Davenow
teh numbers on the engine. Get them, post them.

Or look at the heads/cam pullies.
what do you look for
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Old 09-01-2005, 02:26 PM   #5
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Quote:
Originally Posted by ofay
what do you look for
Quote:
Originally Posted by cronic
Look for the avcs solinoids..
12345
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Old 09-01-2005, 03:46 PM   #6
ofay
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still hatin ROTAS

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still lost
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Old 09-01-2005, 03:54 PM   #7
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wow, the scooby specialists are being very vague today
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Old 09-01-2005, 05:15 PM   #8
TheMadScientist
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Default Non-avcs

Screwed up
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Old 09-01-2005, 05:16 PM   #9
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AVCS at the top front of the head.

TMS
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Old 09-01-2005, 05:46 PM   #10
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And if its JDM it has it on the back side too.


Scoobs
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Old 09-01-2005, 06:06 PM   #11
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Quote:
Originally Posted by Scoobs2002
And if its JDM it has it on the back side too.


Scoobs
Nope..
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Old 09-02-2005, 04:48 AM   #12
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Quote:
Originally Posted by TheMadScientist




AVCS at the top front of the head.

TMS
a picture says a thousand words....

thanks!!
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Old 09-02-2005, 12:29 PM   #13
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I can't seem to figure this one out on my own. What does AVCS stand for?
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Old 09-02-2005, 12:34 PM   #14
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Active valve control system

TMS
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Old 09-02-2005, 03:26 PM   #15
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Thanks for helping me continue my re-education, TMS.


Note - I just found this thread if any newbies like me are interested and like me have more questions. http://forums.nasioc.com/forums/showthread.php?t=134854

Last edited by specialev; 09-02-2005 at 03:40 PM.
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Old 01-13-2020, 04:44 PM   #16
sebastian323
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How can I tell if I have dual or single AVCS? I have one AVCS solenoid on each head, and two oversize AVCS cam gears on the passenger side head. The head I have are labeled Z20, and the block is an EJ20 labeled EJ20 Z20 701
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Old 01-14-2020, 01:16 PM   #17
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Quote:
Originally Posted by sebastian323 View Post
How can I tell if I have dual or single AVCS? I have one AVCS solenoid on each head, and two oversize AVCS cam gears on the passenger side head. The head I have are labeled Z20, and the block is an EJ20 labeled EJ20 Z20 701
I beleive those are off a ej20x or y they are dual avcs btw
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Old 01-16-2020, 01:37 AM   #18
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Quote:
Originally Posted by subaru_gc8 View Post
I beleive those are off a ej20x or y they are dual avcs btw
Yes I have an EJ20x ( I dont know what the x is yet)
This is what my AVCS cam gears look like

https://i.imgur.com/2W3GY2J.jpg

https://i.imgur.com/sMr7bA8.jpg
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Old 01-16-2020, 08:14 AM   #19
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EJ20X is the engine code. EJ20X came off an 03+ legacy GT automatic, the EJ20Y came off an 04+ legacy GT with a 5 speed manual.

Both have dual AVCS.

I believe the main difference is the x has a vf38 twinscroll setup from the factory, while the Y has a td04-19t single scroll.

Both good motors. If you have an auto, it's an x, a manual, it's a y, unless a swap has been done.
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Old 01-16-2020, 03:03 PM   #20
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Quote:
Originally Posted by bugeyerex02 View Post
EJ20X is the engine code. EJ20X came off an 03+ legacy GT automatic, the EJ20Y came off an 04+ legacy GT with a 5 speed manual.

Both have dual AVCS.

I believe the main difference is the x has a vf38 twinscroll setup from the factory, while the Y has a td04-19t single scroll.

Both good motors. If you have an auto, it's an x, a manual, it's a y, unless a swap has been done.
The little timing belt retainer that is present on manual cars to keep the belt from coming off if you get bumped while parked in first was there (https://parts.mckennasubaru.com/p/Su...hoChhwQAvD_BwE, so I believe the engine came off a manual car. My engine came installed in a manual 06 WRX hawkeye. Does the fact that I have a legacy motor mean the previous owner changed the ECU ?
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Old 01-16-2020, 06:46 PM   #21
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Quote:
Originally Posted by sebastian323 View Post
The little timing belt retainer that is present on manual cars to keep the belt from coming off if you get bumped while parked in first was there (https://parts.mckennasubaru.com/p/Su...hoChhwQAvD_BwE, so I believe the engine came off a manual car. My engine came installed in a manual 06 WRX hawkeye. Does the fact that I have a legacy motor mean the previous owner changed the ECU ?
There's no way we can tell this. Do you have a taxtrix cable? Can you pull the map and post the ECU ID?
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Old Yesterday, 05:50 PM   #22
sebastian323
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Quote:
Originally Posted by bugeyerex02 View Post
There's no way we can tell this. Do you have a taxtrix cable? Can you pull the map and post the ECU ID?
The car is a 2006 WRX and the original owner swapped in an EJ20X/Y from a Subaru Legacy GT and retained the original EJ255 ECU and wiring harness. My EJ20X/Y has AVCS on both intake and exhaust for a total of four AVCS cam gears and four AVCS solenoids. I realized there are actually 2 solenoids on the heads for the exhaust AVCS, which were unplugged (one of them even had its connector broken off). I have read on a LegacyGT forum that the EJ20X/Y can be run with the exhaust AVCS solenoids unplugged but that the exhaust cam gears need to be locked in a neutral position to avoid exhaust timing advance/retardation.

Quote:
If you have the Z20 heads, you should know that when the exhaust side AVCS components are unplugged, the cams go into full retard position, which robs quite a bit of power that the engine should have.
Quote:
Um. I spoke to Jeremy at Outfront Motorsports, the definitive knowledge source for all things Subaru engine related regardless of continent of origin. He says "why would you want to do that? Tell him it wont work". Then he says, "if he pays you to do it have him sign that your not responsible before proceeding".

Then he proceeds to laugh and go on about all the sand cars he has built (and that I have worked on) with locked cams and unplugged solenoids.

Just trying to save you the grief. All you have to do is leave the exhaust avcs solenoids unplugged.
- https://legacygt.com/forums/showthre...-270757p2.html

Last edited by sebastian323; Yesterday at 06:24 PM.
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