Well after a 4 week wait my babys back and the resukts are very good

my06 2.5 sti uk

mods are

forged pistons
rods
headers heat wrapped
garrett hybrid turbo
clutch
ingectors
and more

made 461bhp / 465nm on the rollers today
and drive brilliant so smooth
so if anyone is thinking if of having any work done give paul a ring @ zen performance highly recommended

Thanks Tony

 

06 car, you didn't mess about

 

Good result Tony. You need to get some pics up of your car, the build now completes the looks. it really is a stunning car...

 

Tony I'm very interested in what parts etc you fitted as I have a MY07 STi that I want to mod but the pistons are my concern. Could you PM me with some more detail on makes and prices please.

Thanks

Marc

PS Great Results

 

pics will follow as soon as i sus out photo bucket hehe

marc will pm u later with more details or call paul @ zen on 01933 675 432

 

465nm ?

Thats about 340 lb/ft torque - seems very low

 

may be i mean lb/ft torque not nm not too sure will post up dyno later too ok

 

lb/ft would make sense with what you have had done on a 2.5 - nice figures

Good mods that you have had done though - will make it bullet proof to a large extent and pull like a steam train

I will need to change pistons/rods/turbo in mine at some point, although no-one actually knows the limits of the 06 STi pistons yet despite talk of them being made of chocolate.

 

Not chocolate, "hypereutherics". I read that Subaru's WRC cars have changed to hypereuteric cast since the forged ones wore out the motors too quickly. (Forged pistons expand more under heat so looser tolerances are used. Those looser tolerances lead to more piston slap.) However, Sti (Subaru or whowever) is claiming that the new hypereuteric cast pistons are approx. 120% stronger.Hypereutectic aluminum pistons are made from an alloy with hi-silicon content of 16% to 18%. Hypereutectic aluminum has 15% less thermal expansion than conventional piston alloys. The silicon reduces heat transfer, allowing the piston to run cooler. The silicon gives the hypereutectic it’s thermal & wear characteristics (improves resistance to scuffs and seizure). As long as the silicon granularity is controlled (kept small) the piston should be stronger than regular cast alloy pistons. However, when granularity increases the mechanical properties of the material drop substantially. I wonder how the pistons will react to overboosted engines and higher combustion chamber temperatures? I just wonder where the real limits of the pistons are, where reliability really starts to drop off, the approximate power level. Could be 350chp, could be 500chp. I wish we knew.

 

so do i

Would save an expensive unecessary piston/rod replacement if these will cope with up to 500

but who wants to be the one that pushes it just over what they can cope with? ... not me (or at least not intentionally anyway)

Shadower - have you had to run the engine in again?

 

thats why i changed my pistons etc as before the build with the fmic and turbo td06 it was runing 375bhp and didnt want to push my luck

i did 500 easy miles first then went back yestarday for the full tune

 

£ ?

 

I think you made a good decision

I am around that figure now 360/400 and the next big step to take it above 400 requires a chunk of money being spent that i cant justify yet. I'd be interested to find out roughly how much it cost you though (pm if you like)

 

pm sent

 

I think that pistons are not problem with new motors (2.5). Problem is because same piece of 2.0 block is raised to 2.5. Aquamist is possible solution or something to reduce overheating.

 

The liners have been proven to distort at close to 500 bhp from what i remember.

Interesting info on the std pistons though

 

Sounds great ! Bet you're skint now mate ? £4k ?

 

I thought that was the case when putting 2.5 block to 2.0 heads. It's a different story with 2.5 block and 2.5 heads?

 

correct skint


But Very happy

 

I can host them for you if you want, just e-mail them to me and I'll get em up

 

try this for the dyno

http://i155.photobucket.com/albums/s...wer72/dyno.jpg

 

dyno





pf discs









pics as promised

 

Looks great !!!

 

nice where did you get bonnet from?

 

I've seen the car there a couple of times, and Paul was talking about it. And I was admiring the bonnet - if I ever go front mount I want one like that.

I was in the bugeye that arrived while you were settling up on Thursday.


M

 

 

Really Nice

I note the fog light surround air duct - is this going straight to the normal air box or do you have a wing mounted induction kit?

re the FMIC - think that would look lovely sprayed black

 

induction kit in wing

bonnet from sebon carbon in the states amber performance is the importer in uk 650 quid
not bad i thought

 

great looking car Shadower, saw it up close at Zen. I bet you cant stop grinning,

 

I like that: very sinister!

I think I still would have kept the scoop though

Nice job!