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Old 02-05-2008, 04:10 PM   #1
wrx2k4
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Default sti cams on 2.0 heads

im building a 2.5 hybrid set up, and im thinking about using sti cams on my 2.0 heads. Does anyone have any experiance with this so that they could offer some advice or problems they encountered?
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Old 02-05-2008, 04:28 PM   #2
advanracing62
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I don't know if you can do it with the VVTI (or whatever it's called on Subaru's)... isn't there an extra lobe?
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Old 02-05-2008, 04:45 PM   #3
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There is an extra oil hole. Some vendor here makes a kit to use the STI AVCS cams in a non AVCS head. I cant remember who though..
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Old 02-05-2008, 06:29 PM   #4
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Harman Motive might have your answer for the STI cams on 2.0 heads?
www.harmanmotive.com
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Old 02-05-2008, 08:42 PM   #5
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bump, im looking for that info too, as I dont want to suffer gas mileage from aftermarket cams....
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Old 02-05-2008, 09:26 PM   #6
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I don't think you can use the term gas mileage and high performance 2.5 in the same concept. A high performance 2.5 sti is good for about 18 mpg all around if your lucky. Thats with stock cams and a rotated 30r and so forth.

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Old 02-05-2008, 09:35 PM   #7
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Old 02-06-2008, 05:33 AM   #8
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very interesting! thanks for the help! im thinking sti cams maybe worth the effort. found some for good price and very low miles.
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Old 02-06-2008, 09:44 AM   #9
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you need to close up the avcs oil holes, get the cam seals for the sti cams and check lash and bucket size, then assemble as usual...
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Old 02-06-2008, 04:10 PM   #10
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yeah i heard you have to shim it out with new buckets, i've also been told that if you dont seal up the avcs holes correctly it will cause a leak.
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Old 02-06-2008, 08:54 PM   #11
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Quote:
Originally Posted by wrx2k4 View Post
i've also been told that if you dont seal up the avcs holes correctly it will cause a leak.
yeah...that is what happens when you have a pressure fluid behind a bad seal
I'd tap it and run in set screws with some loctite or henkels sealing compound. I've the sealing compound on some press fit assembled parts at work and never had an issue.
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Old 02-06-2008, 09:17 PM   #12
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just fyi, I happen to have a set of 'stage 1' ported and polish WRX heads if you're interested. you could probably put your current heads on ebay and have money left over since you're rebuilding them anyway.

asking $900, perfect condition (heads only, no internals). they're up at Fine Line Imports in santa rosa, feel free to call them directly or just PM me if interested.

they look just like this:

http://finelineimports.net/index.php...roducts_id=169
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Old 02-06-2008, 09:44 PM   #13
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Let me know what you decide. I just got my used STI cams in the mail and I am getting ready to install them. All I was planning on doing was putting them in after I plugged the AVCS holes. I did not know about the STI cam seals... The guy at the head shop says we have hydraulic buckets and therefor i shouldn't need new buckets.
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Old 02-06-2008, 09:54 PM   #14
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Hey man, I wouldn't really worry about the cams depending on what you want to do. I believe the STI cams have a slightly higher lift but are the same duration. If you want to run a smaller turbo (TD04, VF39) you can just use your stock WRX cams and it might hurt you a bit up top but you probably won't be able to notice. I have a WRX hybrid with stock 02 heads and stock cams and it pulls hard all the way. Looses a bit of steam up top but not any more than a typical VF39 setup. Run the stock sti head gaskets, boost your compression a bit and your car will be super responsive and torquey. If your looking to go with a bigger turbo then I'd definitely look into the cams. I talked with a bunch of tuners about it before my build and they all pretty much said the same thing.
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Old 02-07-2008, 01:05 AM   #15
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Quote:
Originally Posted by UP2MTNS View Post
just fyi, I happen to have a set of 'stage 1' ported and polish WRX heads if you're interested. you could probably put your current heads on ebay and have money left over since you're rebuilding them anyway.

asking $900, perfect condition (heads only, no internals). they're up at Fine Line Imports in santa rosa, feel free to call them directly or just PM me if interested.

they look just like this:

http://finelineimports.net/index.php...roducts_id=169
yeah a friend found a pair of 07 avcs complete heads for me for around 800.00 but i will have to go with a hydra if i wanna be able to use the avcs.

im looking at going to a fp 20g nothing bigger, so i dont know if its even worth it. As far as the sti cams thinking how you tap and put set screws in the avcs holes. Wouldnt it cause a balance issue adding the weight of the set screws? thanks for all your input. if anyone comes with any thing else post it up hopefully leads me in the right direction.
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Old 02-07-2008, 10:25 AM   #16
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I have STi cams in a set of WRX heads, they hold power later then the WRX ones did. As for tapping the cams, I can't remember what size tap I used. I went to home depot got the drill/tap combo, some set screws and lock tight. Drill the holes out with the bit, then tap the new bigger holes, little lock tight and install the set screw. I don't think it cause a balance issue, it is such a small weight when compared to the whole cam and cam gear. There also isn't much room for the cam to move when installed.
Edit maybe I should have clicked the link 1st, much better write up then mine.
MCL
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Old 02-07-2008, 11:30 AM   #17
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Yeah I wanted to get STI cams because i have a TD0518G and I wanted it to breath up top. For the ones who have this mod done, besides tapping and plugging the wholes anything else needed? Like buckets or cam seals or whatever?
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Old 02-07-2008, 11:41 AM   #18
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I have a 2002 so I had to re shim the buckets, huge PITA. I would use new cam oil seals, and valve cover gasket set.
MCL
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Old 02-07-2008, 12:03 PM   #19
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Quote:
Originally Posted by Paulys05wrx View Post
Yeah I wanted to get STI cams because i have a TD0518G and I wanted it to breath up top. For the ones who have this mod done, besides tapping and plugging the wholes anything else needed? Like buckets or cam seals or whatever?
like stated earlier...you will need the cam seals for the AVCS cams...so go ask for sti cam seals
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Old 02-07-2008, 02:15 PM   #20
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isn't the diameter of the cam seal different between avcs and non-avcs cams?
avcs cam made larger for the oil ports.
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Old 02-07-2008, 03:11 PM   #21
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I think the cam shaft is the same size. The only reason the STI ones are different is because they seal on the gear, not the cam. If you are using WRX (none avcs) cam gears then you will need to use WRX style cam seals.

FYI - If you just tap the existing holes then you can remove the set screws and use the cams with AVCS later if needed.

Last edited by mick_the_ginge; 02-07-2008 at 03:11 PM. Reason: typo
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Old 02-07-2008, 03:40 PM   #22
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From what I have read the only difference in the cam seals is that the STI AVCS cams dont cover the whole front are of the cam. They have a little space left over because the avcs cam moves with timing advancing the extra area covered by a wrx seal would impede the soleniod advancing the cam due to friction on the cam at the point of contact with the cam seal. So my conclusion is if not using AVCS which most of us with hybrids are doing, use WRX cam seals.
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Old 02-07-2008, 03:57 PM   #23
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Quote:
Originally Posted by WJM View Post
^You've read wrong.
Okay that is what I read so the poster must have been wrong... well is the conclusion wrong as well?
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Old 02-07-2008, 04:07 PM   #24
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Quote:
Originally Posted by WJM View Post
^You've read wrong.
good to know, I was misinformed too...and sealing on the cam gear does make complete sense, now that I think about it...that's what I get for not playing with my avcs

that and now that I think about it, if that part of the cam were a different diameter, the cams wouldn't be interchangable between avcs and non-avcs heads
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Old 02-07-2008, 04:51 PM   #25
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As far as the weight aspect goes....the holes are already there, and its balanced on that note. So when adding the same amount of weight into those holes, what difference would it make? Given that you take out the same amount on each tap and use the exact same screws, it should be extremely close in weight comparison.
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