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#1
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2.5 Sti Heads
Hey guys.
I have a '98 wrx and i'm looking at going 2.5 for my next engine very soon as I scored a brand new 2.5 forester block for cheap cheap. A mate of mine has a pair of '06 sti heads for me if I want them, but I was just wondering, as they have avcs, would this work? What would I need to get this thing going (loom, ecu etc)? I currently have the autronic smc, would this be compatible with the motor/heads etc? If its to much of a mission, i'm not really phased just the sti heads are there, so if I can use them, I might as well slap'em on, if not i'll just use my wrx heads (if thats even possible)? Any info would be great guys, cheers. Mat
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Undefeated highway dominator |
#2
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it is possible, but yeah, you may need a new ECU for the AVCS and some rewiring and you wont be able to use your current my98 intake manifold with it as it wont bolt onto the new heads.
Possible, but lots of messing around
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RS Liberty - Because WRX's are only good for parts... |
#3
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Buy the heads throw in some big cams w/o avcs wam bam... K Thx Bia
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I AM WE TODD DID... I AM SOFA KING WE TODD DID... |
#4
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You can use the heads and just leave the AVCS solenoids disconnected, they will just act like normal cams.
As mentioned you can't use a MY98 manifold with the sti heads, but you can put MY98 wrx heads onto the 2.5 short block. If you have a MY98, this will be the easiest option. To use AVCS your going to have to change to a motec, autronic SM4 or linkPlus G3. All would have to be wire in for a MY98. The SMC does not do variable valve control. You could possibly change to a newer subaru ecu, but this is ALOT of work, requiring the newer dash and vehicle loom.
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John Stamos fan club lifetime member |
#5
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Thanks heaps guys, and girl lol.
Thats all I needed too know. Great help as always!
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Undefeated highway dominator |
#6
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I would do a LOT or research before getting an Autronic SM4 or Link G3 to make doubly sure that it does AVCS if your keeping the AVCS Cams....
Motec M800 Plug in on 99 WRX's works with AVCS with 6-8 wires to wire in. You would need the Gold Box in a MY98. J
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"You can turn your back on a person, but, never turn your back on a drug. Especially when it's waving a razor-sharp hunting knife in your eye." - Raoul Duke |
#8
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Quote:
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Speak to Shane @ SMC Tyres, Unit 6/385 Sevenoaks St Beckenham WA 6107. Mobile 0413 128 087. Tell him Maddog sent you! |
#9
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AVCS heads can be run as normal heads...just make sure there is no power going to the solenoids.
You will still have to run the oil lines to the solenoids though, or your cams will seize up nicely. Probably worth removing the AVCS cams and fitting a nice set of Cosworth billets, or something similar. |
#10
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Jamie
After having done alot of research myself I can say with some certainty that the SM4 and LinkPlus G3 will do AVCS, you just need to use a wire in. And I'm sure as you and stace (and hopefully me) are about to find out, the Motec pnp will do it too, though I suspect you will need to use the later model manifold to get rid of the stepper idle control.
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John Stamos fan club lifetime member |
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25, heads, sti |
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