wrx - STI

[donnylad]

Hi just a general question.

 

Engine and power wise.what is the difference between these? by that I mean I know the wrx is around 220 and the STI around 2

 

What is the difference? is the block, camshafts. pistons etc the same?

 

I think the STI has a different:

turbo
TMIC
injectors
exhaust
ECU

 

Other then that are they the same? Can both engines be tuned to the same bhp using supporting mods?

 

Thanks!

 

 

[savage bulldogs]

It depends on what year sti or wrx and whether it's a uk or jdm version .

Generally the sti has all the above plus better cams ,headgaskets and forged pistons .

So for instance a 04 wrx would probably be at its limit at 360 hp . Whereas a 04 jdm sti would be good for 450 hp, have better brakes and a much stronger 6 speed box.

If it's not broke .....upgrade it 😊

[donnylad]

ohh didnt realise internal etc where different thats great thanks!

 

Mine is a 2001 wrx, but If i can achieve 320-350 bhp I would be very happy. I know they can go to 320 but unsure if they can go to 350 on the standard internals clutch and box.

[Tidgy]

It varies greatly from year to year, but a rough list (taken some from above to make it as complete as possible)

 

Different manifold 

some years have no/single/double avcs 

Suspension 

brakes 

pistons are different as said but new age don't have true forged pistons, they have hypereutectic

Interior

DCCD/no DCCD

Bodywork difference, high level spoiler, roof spoiler on hawks.

Wheels

PCD is different on some years

R180 vs R160 rear set (r180 is a stronger diff and different hubs)

Cams

ECU is the same but different map

Exhaust is the same bar a cat removed on the STI

Intercooler

Injectors

turbo

 

So simply put alot beyond the engine as well