Upgrading to STI components

[Guest]

Hi all, 

I currently have a 2010 wrx-s running 285bhp due to the following mods:

Sports cat
360lph fuel pump
Cat back exhaust
Induction kit
Remap

I’m looking to change the turbo/ inlet manifold and inter cooler to STI parts and remapping to 330ish bhp, has anyone done this before, or anything to look out for?

 

Thanks

[savage bulldogs]

I'm not too clued up on 2.5 spec but with the 2ltrs , to break the 300hp mark (on top of the mods you have) most fit ....

Sti turbo , sti injectors ,sti tmic and sti up pipe (as the bug /blob wrx have a pre cat in the up pipe )

Unsure if the 2.5 ltrs have a pre cat or if there's any difference in the sti inlet manifold, other than if the non sti has tgv's ? (Which i think can be deleted on your existing manifold if so)

Hopefully someone  who knows their latter scooby spec can help 

[Guest]

11 minutes ago, savage bulldogs said:

I'm not too clued up on 2.5 spec but with the 2ltrs , to break the 300hp mark (on top of the mods you have) most fit ....

Sti turbo , sti injectors ,sti tmic and sti up pipe (as the bug /blob wrx have a pre cat in the up pipe )

Unsure if the 2.5 ltrs have a pre cat or if there's any difference in the sti inlet manifold, other than if the non sti has tgv's ? (Which i think can be deleted on your existing manifold if so)

Hopefully someone  who knows their latter scooby spec can help 

Thanks, I figured that I was on the right track, just a bit concerned that its going to be too much for the car, but other than gearbox and clutch, I guess changing these components the engine will be ok (as it’ll be v similar to an STI with a remap)

 

[savage bulldogs]

Will admit the 2.5 ltrs do get a bad rep when pushed for power ,as they do tend to suffer from headgasket and ringland failure more than the 2ltrs .

The later 5 speeds seem to handle more hp than the earlier ones (350hp ish) but the added torque of the 2.5 can tend to push close to the limits of a 5 speed .

6 speed is the most comon upgrade at £1.5k for just the box (no labour) , then most save for a forged build (£5k) just in case the stock block goes pop .

But I'd suggest to speak to your mapper about the best route and power limit for your block and drivetrain,  before buying any parts .

[Guest]

10 hours ago, savage bulldogs said:

Will admit the 2.5 ltrs do get a bad rep when pushed for power ,as they do tend to suffer from headgasket and ringland failure more than the 2ltrs .

The later 5 speeds seem to handle more hp than the earlier ones (350hp ish) but the added torque of the 2.5 can tend to push close to the limits of a 5 speed .

6 speed is the most comon upgrade at £1.5k for just the box (no labour) , then most save for a forged build (£5k) just in case the stock block goes pop .

But I'd suggest to speak to your mapper about the best route and power limit for your block and drivetrain,  before buying any parts .

Thanks, to be honest this is a very good point and i will have a chat with my mapper about this first. The car is my daily so i don’t want to risk making it too unreliable, or costing me a bomb when it all goes wrong 🙃 !

[Sandals]

They ditched the cat in the up-pipe for the 2.5's

[Tidgy]

Hawk onwards 5 speed is considerably stronger so shouldn't be an issue unless your ham fisted with it, i ran 390/420 on one for 15 months no issue and know a few others who have been well over 400.

[Guest]

1 hour ago, Tidgy said:

Hawk onwards 5 speed is considerably stronger so shouldn't be an issue unless your ham fisted with it, i ran 390/420 on one for 15 months no issue and know a few others who have been well over 400.

That’s very good to know 👍 thanks!