Forged 2.5 Question
#1
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Forged 2.5 Question
Hi,
Ive recently bought a 2009 hatch sti. Im well aware of the problem that many have had with the 2.5 engines. Im looking to forge mine. Ive spoken to api and said thats needed is pistons, head studs and head gaskets. Will this be enough? What sort of power could the engine take with this mods? Ive seen peoples rebuild specs and the list looks endless.
Thanks Jamie
Ive recently bought a 2009 hatch sti. Im well aware of the problem that many have had with the 2.5 engines. Im looking to forge mine. Ive spoken to api and said thats needed is pistons, head studs and head gaskets. Will this be enough? What sort of power could the engine take with this mods? Ive seen peoples rebuild specs and the list looks endless.
Thanks Jamie
#3
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rods are prob worth doing at the same time if your going towards 450 ish, you can get away with it but its pushing it and given the engine will be stripped down makes sence to do it.
your then into other options to do at same time, inlet pipe (sits under manifold), tg delete etc etc
your then into other options to do at same time, inlet pipe (sits under manifold), tg delete etc etc
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Cheers guys. Well i just want to build a safe and strong engine as i know the standerd uk ones are weak. Id be happy with anything around 400+ but i know some builds can costs ££££'s and i dont really fancy that route. What else is there worth doing along with pistons, rods, headgasket and head studs.
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Haha no maz! Just want a safe strong engine
Well i want to start buying all the bits over time and get dirk and powerstation to do it for me. Cant really afford to fork out a lump in one. Just need a rough idea what to buy etc.
Tidgy.. What spec is your 2.5?
Well i want to start buying all the bits over time and get dirk and powerstation to do it for me. Cant really afford to fork out a lump in one. Just need a rough idea what to buy etc.
Tidgy.. What spec is your 2.5?
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#8
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Hi Jamie
Speak with Alyn@AS Performance or Paul Finch about the CDB insert and engine build.
If budget allow then I would go with CDB insert and Cosworth 11mm 260k psi Headstuds..
I've run on Open Deck Block 490BHP without the issue,this has been without the NOS,with NOS we are run above 500bhp and this has been on 11mm ARP headstuds and Open Deck Block
Jura
Speak with Alyn@AS Performance or Paul Finch about the CDB insert and engine build.
If budget allow then I would go with CDB insert and Cosworth 11mm 260k psi Headstuds..
I've run on Open Deck Block 490BHP without the issue,this has been without the NOS,with NOS we are run above 500bhp and this has been on 11mm ARP headstuds and Open Deck Block
Jura
#11
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ran 404/421 when it was mapped but pulled back slight on the road due to top mount not coping and now sat at 385/404.
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If i got mahle pistons, uprated rods, headstuds, acl bearings in the standerd 2.5 block. Would my engine be regaurded as strong/safe? Enough to cope with circa 400bhp?
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Yes, the limit then would be the block, the general rule is 450 on a std scdb, there are plenty running much more but most of us would not recommend it.
#20
the 2.5 engine is a different animal dont risk running high power without doing all u can to limit its weak points
the 2.0/2.1 odb can take more stick the 2.5 cant
the 2.0/2.1 odb can take more stick the 2.5 cant
#23
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We are used JDM WRX AVCS heads with stock cams and stock valves/springs.
Many people run 2.0L OBD in excess 550bhp without the issue,OBD block is OK,if you are not looking to break 550bhp,2.0L block liners are thicker than 2.5L
But if you are thinking to run more than 1.8-1.9bar I would add 14mm headstuds,but at this stage I wouldn't consider OBD at all,probably i would rather go with CDB or CDB insert
Jura
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Was recently going to send an engine for the insert myself, only reason we didn't go with it in the end was down to the fact she is never going to run a bigger turbo to make use of that spec engine, so went the pinned route on a SCDB instead. I was very surprised at the cost as well tbh of the insert £450 plus carriage which i thought was very fair.
Last edited by Infected by sti; 02 January 2014 at 06:34 PM.
#25
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It still won't make it bullet proof imho, I've seen first hand how thin the liners are and that's what will cause your problems. When put side by side with a new age 2.0ltr liner you see how thin they actually are, whilst the insert will help limit the movement it still won't cure it.
Was recently going to send an engine for the insert myself, only reason we didn't go with it in the end was down to the fact she is never going to run a bigger turbo to make use of that spec engine, so went the pinned route on a SCDB instead. I was very surprised at the cost as well tbh of the insert £450 plus carriage which i thought was very fair.
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