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Old 09-21-2007, 01:06 AM   #1
Scooby Newbie
Member#: 134429
Join Date: Dec 2006
Chapter/Region: TXIC
Location: SA
02 wrx

Default noob 2.5 ?

first, yes ima noob i admit it and iv look at other forums and gone just about everywhere to ask this question but i havnt found a DEFINITE answer yet ....i have a stock 2002 wrx and i want to put a 2.5 shortbolck in. Does anyone know what i need to do?? Is it true that all i need is to just upgrade the cams and springs in the heads or would i need a tune with it also, im getting stg 2 cobb AP also so would that be fine?? and does anyone know where i can find a good shortbock or cylinder heads? the car is a DD and im not looking for like 500 hp either i just want a lil extra sumthin, thanx
DausWRX is offline   Reply With Quote
Old 09-21-2007, 01:45 AM   #2
Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
1990 Legacy wagon
goes 12.387 @ 116.5


How much do you have to spend?
reddevil is offline   Reply With Quote
Old 09-21-2007, 03:17 PM   #3
Scooby Newbie
Member#: 145138
Join Date: Apr 2007
Location: Stockton, California, 209
2002 Impreza WRX
WR Blue


While you wont really gain any HP from the Short Block you will gain a bunch of Torque and you can use bigger turbos and push bigger boost with the 2.5L.

Many different people will advise you to get different things, you should do a search on "STi 2.5L hybrid"

Here is what I did with my swap and other things recommended by my tuner.

STi 2.5L Short Block
STi Head Gaskets
Engine Overhaul Gasket Kit
One step colder plugs
STi Water pump
Cosworth Oil Pump
ARP Head Studs
PE Kevlar timing belt
Belt tensioner
Machined my WRX heads

You will need EM, I went with the Cobb AP, and you will need a custom tune as there is no map available for the hybrid setup.

If you have enough money you should do some head work like upgrading your cams, this will help with your top end power.
MindzeyeWRX02 is offline   Reply With Quote

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