Bob 53

Excuse me if this question has been asked before; I was wondering if the 06 Forester XT engine is a detuned version of the 06 STI engine? From previous threads I gather that they are quite similar.

Thanks, Bob

Dodiox

i want to know the exact same thing.

depdivr

I think that the block is exactly the same but internals are different enabling the STI to take high boost levels.

Nick Koan

iTrader: (3)

I don't know if it is conclusive or not, but I've heard that the internals are actually the same. The differences comes from the heads and the tuning.

b4437

it's the same as the 06 wrx engine(same compression). the 06 sti has a lower compression than the xt and wrx. on the other hand,the 05 forester xt and 05 sti are the same engine.

neuspeed

Wait the 05 forester XT and STi have the same engine?; but different turbo/IC/and fuel pump/ injectors?

b4437

yep,except we have the same injectors.

Peaty

iTrader: (2)

and ECU tuning, some people have installed the STi's turbo and IC then just plugged in an STi ECU. The 04 XT also has a pre cat and the STi does not the resonator in the exhaust is smaller in the STi too. No one is sure about the fuel pump either. We think it's the same. Quite a few guys on the Forester forum (www.subaruforester.com) are putting down 300 WHP. I'm gonna hit the dyno this month and see what I'm up to with my mods. I was able to beat a stock STi in the 1/4 this year, but I'm not stock (and he was).

Juelz5420

i am thinking of buying a 06 forresrter xt for my girl. i have a 05 sti if i decide to get a after market turbo and injectors and intercooler will all my stuff bolt on the forrester.

Peaty

iTrader: (2)

Yes but AFAIK the injectors are the same, the turbo will bolt on and the IC needs some bracket modification and you need to watch the back of the IC does not rub a hole in the AC line (needs to be bent out of the way or something)

Juelz5420

what does afaik mean? but thanks for the reply peaty think i am going to get that for her?

Peaty

iTrader: (2)

AFAIK = As far as I know

Christian.

Just to give another perspective. '06WRX = '06FXT, engine wise.

'06WRX & '06FXT Fuel injectors are larger than any STi. Thay are around 550cc in size. STi injectors should be around 520cc.

Christian.