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Old 10-06-2010, 10:20 AM   #26
jkopinga
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OK! Now I found something that hopefully explains it WITH pictures. Very nice info which I didn't even know existed until I started searching for it. Perhaps a sticky

http://www.scoobymods.com/diy-plug-a...se-t12446.html

Cheers,

Jasper Kopinga
CS Racing
Taiwan.
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Old 10-06-2010, 07:10 PM   #27
Bad Noodle
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thanks for the info jkopinga. That clears it up. So as long as the solenoids are in place and unplugged then the 4 holes can be blocked off and the cam will still get oil in the journal.
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Old 10-06-2010, 07:56 PM   #28
bertune
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Don't know if it passed me but i didn't see where anyone mentioned the location of the cam sensor.
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Old 11-12-2010, 08:46 PM   #29
Alaskan EJ20
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i just got my cosy 08sti heads, this now make sense on the intake side, i got to take some pics so i can figure how do the same on the exhaust side. do the same solenoids power the exhaust avcs on 08stis, where does the oil come from for the exhaust cams and gears?

so we're on the same page, this is going to be a forged 2.5l shortblock with 08 sti cosworth heads ran non avcs intake and exhaust, 2.0L wrx wiring,

Last edited by Alaskan EJ20; 11-12-2010 at 08:56 PM.
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Old 11-13-2010, 08:35 PM   #30
Alaskan EJ20
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different solenoids power the exhaust avcs, i found a thread where wagonkenny on here made plates to cover the exhaust avcs but that would have caused the front cam journal to not get oil. big no no. he then added and tapped bungs for an oil line to run to each from an oil sandwich. good solution but couldn't i just use the stock avcs solenoids and plug the front of the cams like im doing on the intake avcs setup.

thanks
gabe
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Old 11-14-2010, 01:34 AM   #31
RYNOMOTO
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Quote:
Originally Posted by Alaskan EJ20 View Post
different solenoids power the exhaust avcs, i found a thread where wagonkenny on here made plates to cover the exhaust avcs but that would have caused the front cam journal to not get oil. big no no. he then added and tapped bungs for an oil line to run to each from an oil sandwich. good solution but couldn't i just use the stock avcs solenoids and plug the front of the cams like im doing on the intake avcs setup.

thanks
gabe

YES!!!


Plug the cam oiling holes only and leave the oil lines connected to the solenoid/cam cap housings to allow for oiling. The oil from the steel lines is the only oiling source for the front cam journals, and it works this way for both intake and exhaust on Dual AVCS engines.

I did this on a engine I built for a guy in Colorado... it ended up making 400whp on a mustang dyno with a mild and safe 18psi /pump gas tune on a Dom 3 I think.... been running great for more than 8,000 miles now, so it obviously works well... It is an EJ257 block and heads with the solenoids still in the head's cam caps, but unplugged because this user was utilizing an 02 WRX wiring harness and ECU with a custom dyno tune of course. He said that his tuner noticed no real difference in power between AVCS and this setup running non-AVCS with the larger turbo, compared to STI EJ257's with this large turbo and functional AVCS....

I think AVCS on engines running large cams and stock piston dome designs on stock or forged pistons is asking for trouble.... One wrong move on the AVCS tuning and you have screwed up a bunch of parts for all of the potential of maybe 20-30ft-lbs and 15hp..... of course, having stock pistons that don't even have enough valve relief to allow for a broken belt or out of time engine is pretty ignorant anyways.... IMHO


I am looking at eliminating AVCS from my engine for my own Forester XT and running larger cams and WRX sprockets.... I am not sure if it will throw any weird codes or have more tuning issues than just the bigger cams alone though.....



Any Help?

Thanks
Ryan
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Old 11-14-2010, 01:49 AM   #32
Alaskan EJ20
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just have the tuner eliminate those codes like they do with the rear exhaust o2 sensor and such, then youll never see them come up., thanks for the info.
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Old 11-14-2010, 09:44 PM   #33
RYNOMOTO
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Quote:
Originally Posted by Alaskan EJ20 View Post
just have the tuner eliminate those codes like they do with the rear exhaust o2 sensor and such, then youll never see them come up., thanks for the info.


Thanks Alaskan, that is what I was thinking also....

I may be in the market for some JDM V8 big port heads to port and upgrade big time.... haven't decided yet... those or EJ255/EJ257 ported heads
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Old 11-19-2010, 09:42 PM   #34
Alaskan EJ20
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maybe someone in here can help,

i got my 08 sti cosy heads and of course they came with out any solenoids or sensors, im trying to source:

08 sti avcs exhaust- solenoids and cam sensors
04+ sti intake solenoids

i went to the dealer and my jaw dropped, hoping that someone may have some laying around they would sell me.

i have already posted in the classified threads.
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Old 01-30-2011, 01:40 AM   #35
Moore Performance
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I'm actually very interested in experimenting on my own personal car with this idea...... We're buildling a higher compression SB for it and I might throw on a new set of sti heads that I have laying around with a set of non avcs gears and cams. I'm glad to see more clarification on the oiling for the front journal, b/c that was my biggest concern if I decided to play around with this idea on my car. It's worth a shot and thanks for the great info.
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Old 01-30-2011, 10:59 AM   #36
Wagonkenny
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Been making a reliable 312whp for over 8000 miles now without the AVCS on my 08 STI motor. Alaskan....seriously man I ran into the same problem as you did with not being able to find the exhaust solenoids. That is why I made the blocks, drilled and tapped into the milled out area (seen below), installed 90 degree brass fittings, and plumbed lines from the oil sandwich adapter. My tuner said the same thing as above....."This car makes the same if not better power than a stock 2008 STI." It has a small lag off the start but up top it is ferocious!!





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Old 02-09-2011, 04:53 AM   #37
Alaskan EJ20
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sweet, got ahold of solenoids actually and heads are getting fitted for buckets as we speak, im excited to get in this car a drive it, not sure what the numbers will be because there are no dynos here in Alaska so it will be road tuned, we should get a good idea from the logs though.

Last edited by Alaskan EJ20; 02-09-2011 at 05:07 AM.
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Old 02-09-2011, 04:19 PM   #38
maxpowr
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with the dual avcs cosi heads, i was wondering why you didn't just swap harness and ecu. i know its a lot of work, but i thought dual avcs makes a big difference when all is said and done vs., non-avcs.

then you mentioned bare heads.

funny that i never looked into how much more power the avcs big cam'd engine makes vs. a non avcs big cam'd engine.
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Old 02-09-2011, 04:59 PM   #39
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Quote:
Originally Posted by maxpowr View Post
funny that i never looked into how much more power the avcs big cam'd engine makes vs. a non avcs big cam'd engine.
at a certain point the cam becomes so large that there is no range for AVCS...when you get to that point in the name of peak power, you do trade off a lot area under the curve = lag and less low end torque
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Old 02-09-2011, 05:23 PM   #40
maxpowr
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*chert*
roger that homemade. makes sense to me.
over and out.
*chert*
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Old 02-09-2011, 06:10 PM   #41
Alaskan EJ20
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wont be able to run very much avcs because these valves are huge and i went with non-avcs cam gears because they are lighter, this car is mainly racing on the drag strip so avcs doesnt have too much effect here.
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Old 04-24-2012, 04:27 PM   #42
khalonen
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I'm bit confused.
My situation:
I've got 2003 european STi with single avcs EJ207 running good just abowe 300whp.
Recently bought dual avcs EJ257 2008 european STI motor with #2 rod bearing failure. Planning to make spare motor out of it with forged internals.
I would like to run the 2.5L motor with intake avcs and lock/disable the exhaust avcs.
I know 2008 car is CANBUS and sourcing/using ecu/wiring from one would be too much effort. Standalone ecu would be solution but no budget for it atm.

Can I do this just leaving the solenoids in place, plugging holes at the cam and using exhaust cam sprockets from my 2.0 engine when the time for swap comes?
Or would the right way be somehow locking the avcs exhaust sprockets in one position and using them?
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Old 04-24-2012, 10:09 PM   #43
xxsive25
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My new setup i will be installing is
Built 100mm ej257, 05 cossi heads with kelford r199-c
Cams and wrx cam gears. Using a aftermarket
Cam sensor bracket and 02 ecu and harness.
Ill let u know how it goes... Lol
Not sure if im going to buy adjustable
Cam gears and take the time to degree
The cams. Ill prob just clay the piston
To valve clearance with some old gaskets
On one engine bank.
P.s.... I had my machinist go through
My 05 cosi heads and he found a couple of
Defects.
-the valve guides were protruding out
Of the head so far that under max lift
With the kelf. R-199c cams the retainers
Were hitting on the intake and exhaust guides.
Please take note!
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Old 04-24-2012, 10:11 PM   #44
Alaskan EJ20
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Quote:
Originally Posted by khalonen View Post
I'm bit confused.
My situation:
I've got 2003 european STi with single avcs EJ207 running good just abowe 300whp.
Recently bought dual avcs EJ257 2008 european STI motor with #2 rod bearing failure. Planning to make spare motor out of it with forged internals.
I would like to run the 2.5L motor with intake avcs and lock/disable the exhaust avcs.
I know 2008 car is CANBUS and sourcing/using ecu/wiring from one would be too much effort. Standalone ecu would be solution but no budget for it atm.

Can I do this just leaving the solenoids in place, plugging holes at the cam and using exhaust cam sprockets from my 2.0 engine when the time for swap comes?
Or would the right way be somehow locking the avcs exhaust sprockets in one position and using them?

you can plug the holes and use non avcs gears

or you use the avcs gears without plugging the holes, (if the solenoids aren't plugged in to a signal the cam will not advance)

in both cases you want to leave sensors and solenoid in place.
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Old 05-27-2014, 09:24 AM   #45
wil06STI
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I know this thread has been dead for 2 years but i just bought a set of 11 STI heads and i want to delete the DAVCS and need confirmation that it works and that i will have no issues if done correctly. I dont want to spend the $$ to upgrade to +1mm and all that if im not 100% sure it works.

So far based on what i have gathered i need to do the following to delete DAVCS:

- Use non-AVCS cams or plug AVCS cam holes
- Use -non-AVCS cam seals
- Use non-AVCS cam gears
- Connect intake/exhaust avcs solenoids oil lines
- Use cranck sensor adapter if running stock ECU

Can someone that has deleted DACVS shime and in a provide confirmation?

Thanks,

Wil
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