Gday got an My03 STI 2.0lt has anyone recently upgraded theres to 2.5lt and if so what was the way you went about it eg. bought your own 2.5lt block or got a workshop to do the lot. If so were you happy with results dyno etc.
Thanks in advance any tips would help.
Steve.

Keep the 2 litre.

any technical reasons?

Longer stroke in the same block height with the same rod length leaves less room for the piston. Many would argue that it's a downgrade from a 2.0 to a 2.5 in terms of strength and longevity.

Why do you want to 'upgrade' to the 2.5L?

Essentially we get them as the excess USA stock. JDM still uses the 2L engines which proves (in my opinion) they are still the bees knees.

Already having a EJ207 means you can smash in some serious boost which you can't do on the EJ257's.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

what do you call serious boost im at 20psi now is that on par with most?

Just be aware that the MY03 V8 JDM STI EJ207 engine onwards changed from forged pistons in previous years to Hypereutetic pistons as well. The JDM MY03 engine runs tighter piston to bore clearances due to less piston thermal expansion and a higher redline as a result of less piston weight.
This would be the same engine the JDM MY08 EJ207 Twin Scroll STI has.

All Aus STI EJ207's from MY02-MY05 have the same short block as the JDM MY02 STI model. ie forged pistons that will tolerate detonation far better than the Hypereutetic ones. Heads are different comparing Aus to JDM.

Stick with your forged piston Aus 02 STI EJ207. It one tuff bastard of an engine.

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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

Thats if i even got one, all this talk about some people getting this and some people getting that has got me worried.
I never got a chance to see mine before it was sealed up and dropped in.

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Balls.

tuna runs 32 psi in his ej207 block. Thats a pretty good sign of its strength

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RS Liberty - Because WRX's are only good for parts...

20 psi is only 1.3-1.4bar.

With a good tune and supporting mods up to 2 bar is easily achievable these days.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]