Sti heads onto a wrx newage, is it worth it?
27 November 2013, 04:45 PM
#6
Hi there
As above really depends what power you are looking to run
UK STI heads they're good option,but still will cost you quite lot to do conversion,plus ECU you will need too
With AVCS heads you will gain mainly on spool up and on the top end,WRX heads are OK,but main problem with them is the cams,cams on them are lazy,they're OK up to 400bhp,above that you can struggle
On ECU side,if yours is WRX,then JDM WRX ECU can control AVCS,they usually come for sale not often,but they come
Yes you can fit UK STI ECU,but still you will need to do wiring and other bits
Aftermarket ECU can make sense in many ways,I can only recommend Syvecs S6
Jura
As above really depends what power you are looking to run
UK STI heads they're good option,but still will cost you quite lot to do conversion,plus ECU you will need too
With AVCS heads you will gain mainly on spool up and on the top end,WRX heads are OK,but main problem with them is the cams,cams on them are lazy,they're OK up to 400bhp,above that you can struggle
On ECU side,if yours is WRX,then JDM WRX ECU can control AVCS,they usually come for sale not often,but they come
Yes you can fit UK STI ECU,but still you will need to do wiring and other bits
Aftermarket ECU can make sense in many ways,I can only recommend Syvecs S6
Jura
27 November 2013, 04:47 PM
#7
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I've tried to figure this out from reading peoples posts.
There doesn't seem to be any real answer, because people are after different things, and willing to spend different amounts to get to their goals.
It feels LIle the only really way to find out is to either drive someone's car who has has it done, or do it yourself.
I know that helps F all with your question. But I'm wondering the same thing, and am in the same boat, to do, or not to do?!?!
There doesn't seem to be any real answer, because people are after different things, and willing to spend different amounts to get to their goals.
It feels LIle the only really way to find out is to either drive someone's car who has has it done, or do it yourself.
I know that helps F all with your question. But I'm wondering the same thing, and am in the same boat, to do, or not to do?!?!
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27 November 2013, 04:54 PM
#8
If you have the heads off there is much to be gained by having them overhauled and the chambers worked on to improve gas flow, for instance on my wrx heads there was quite a difference in the left and right head, you would have thought they would be the same but quite a lot of material was taken off to balance them up and improve flow rates.
The STI heads have AVCS and there is much more to it than just swopping. Best to keep it as simple as possible.
Trev
The STI heads have AVCS and there is much more to it than just swopping. Best to keep it as simple as possible.
Trev
Last edited by trevsjwood; 27 November 2013 at 04:57 PM.
27 November 2013, 05:31 PM
#14
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Newage sti heads are an expensive change and I'd say not worth it, you'll get slightly quicker spool and a more aggressive cam profile, capable of more power but then what are your intentions? What mods do you have now?
It's much more of a job than just swapping
It's much more of a job than just swapping
27 November 2013, 05:39 PM
#16
why not just transplant a full sti 8 engine into your car-they are capable of taking 450 bhp+ in standard form and quite cheap aswell plus you can sell your old engine to recoup some cash back 
buy a jdm wrx ecu and a avcs loom made by jt innovations
http://www.jti.uk.com/product/subaru-avcsvvt-loom/
buy a jdm wrx ecu and a avcs loom made by jt innovations
http://www.jti.uk.com/product/subaru-avcsvvt-loom/
27 November 2013, 06:33 PM
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after owning a 03 wrx myself,i can say its not worth it.and after spending an absolute fortune on it modding upto 358bhp including putting the sti8 bottom end in,i can only recommend two things.
A) sell it and buy an sti
B) if you are "attached" to your car like i was and want to keep,dont mess around with the wrx lump.just buy a decent full sti long engine including ancilaries/turbo etc (about 2k give or take) and drop it in with sti wiring and ecu.
i so wish i sold mine earlier and bought an sti,would of worked out a hell of alot cheaper and easier!!
weigh up your options
A) sell it and buy an sti
B) if you are "attached" to your car like i was and want to keep,dont mess around with the wrx lump.just buy a decent full sti long engine including ancilaries/turbo etc (about 2k give or take) and drop it in with sti wiring and ecu.
i so wish i sold mine earlier and bought an sti,would of worked out a hell of alot cheaper and easier!!
weigh up your options
28 November 2013, 10:53 AM
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why not just transplant a full sti 8 engine into your car-they are capable of taking 450 bhp+ in standard form and quite cheap aswell plus you can sell your old engine to recoup some cash back
buy a jdm wrx ecu and a avcs loom made by jt innovations
http://www.jti.uk.com/product/subaru-avcsvvt-loom/
buy a jdm wrx ecu and a avcs loom made by jt innovations
http://www.jti.uk.com/product/subaru-avcsvvt-loom/
PM me if you are interested.
28 November 2013, 02:33 PM
#26
We run our big port JDM WRX(those has been with AVCS) heads at 490bhp on 2.1L without the issue and beyond that I wouldn't run them,without the swapping at least cams/springs and valves
Agree with right turbo they(WRX heads) can flow enough,but still I would swap them
Jura
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