[TheMadScientist]

I did some testing last night. The ECU will not advance the cams off throttle. I set the first 4 rows to 20 and monitored the AVCS on the dashboard. No advance until you have at least 1% throttle input. I wanted the car to idle like it had a big cam in it, ohh well.

TMS

[TheMadScientist]

SOA sucks!!!!!!!!!!!!!

 Hello Mr. Murray,

Thanks again for your message, and for your patience while I researched your
inquiries. I have consulted with our corporate Technical Services Department
and have been advised that the specific technical information you are
requesting is not available for us to share with you. We are sorry that we
are unable to provide the response you may have anticipated.

Best wishes, and have a safe Labor Day Holiday Weekend!

Natalie Cox
Subaru of America, Inc.
Customer Dealer Services
E-Contact Team

TMS

[TheRipler]

Not suprising.

[WolfPlayer]

Originally Posted by nhluhr

I don't think that blowing it out the exhaust valve is what you have to worry about - no, instead you must worry about reversion, especially on undersized exhaust housings like the VF39's P18. The exhaust manifold pressure will be significantly higher than the intake manifold pressure.

Extremely good point. However, I think it is a balance between what I said and what you said (isn't that true with everything in life?). At 3400rpms with 18.5psi on tap it's probably pushing out the exhaust ... but as RPMs get higher - yea, right out the intake. Great point.

t

[crystal_Imprezav]

So bringing this topic back to life after searching for about an hour trying to figure out the AVCS system, has anyone seen any noticable benefits from tweaking there AVCS timing? As I have been searching some people swear on it and some say it will barely do anything. If I am understanding this correctly, advancing the camshaft timing say right before 3200 rpms (or spool) will yield for better spool response since you are basically treating it like a NA motor? It is pretty surprising to me that there is not much out there on the system since it seems to have a pretty robust effect on overall performance as you can see many other companies i.e. the EVO that just added MIVEC. Anyone care to expand on some experiences they have had tweaking the AVCS table?

[ZuMBLe]

I think we have to keep in mind that AVCS is NOT MIVEC or VTEC. AVCS varies the cam but I believe the cam only has one profile. MIVEC like VTEC has a normal cam profile and a power cam profile.

According to this:
http://en.wikipedia.org/wiki/AVCS

AVCS modifies both the intake and exhaust cams. Anyone know if this is definitely accurate?

[crystal_Imprezav]

Ahh great article, I think I am starting to understand a little bit.

http://www.drivesubaru.com/Win05_WhatsInside.htm


But still really have no clue what I am doing yet, lol, im not touching it until i fully understand its capabilities and functions

BTW according to the article it only effects the intake valves.

[daemon]

The 2004 and 2005 STi's only have control of the intake valves. Subaru does have a version for 2006 that does both. Not sure which models of car it is in, but a search would probably reveal all.