340BHP-WRX

iTrader: (6)

Anyone know what differences if any there is between a WRX RA engine and an STI RA engine ?

mr.sheen

dont know, but ive just bought a 95 wrx ra and it goes like a rocket in standard form. cant imagine what an sti ra goes like if its any different

340BHP-WRX

iTrader: (6)

I want to know if there are any technical differences as one thing I have found out is the wrx ra has 380cc injectors but the sti ra has 440cc injectors.

I know they both have closed deck blocks and 5th injectors but i'm not aware of any other differences.

Normski

What year of car are you talking about?

Version 1 & 2 cars all have 380cc injectors, the 440cc came in on the version 3 to 6.

340BHP-WRX

iTrader: (6)

Well that kind of answers my question really. I didn't know all Version 1 & 2 cars have 380cc injectors.

So the wrx ra and sti ra engines are the same then if they are both version 1 or 2 ?

BLACK V5

I know all but version 1 sti`s are rated at between 275-280ps. Where as the RA is rated as the same power as the standard wrx of the same year.

eggy

i think the heads on the sti ra + the cams , would be diferent than the wrx ,, not 100% sure but

rbaz

iTrader: (1)

Might be some useful info here Eta Tauri Site Impreza Reference - Japanese Specification
It says that the STI RA's have a higher output engine but if you look the engine codes up they have the same output but have different numbers

340BHP-WRX

iTrader: (6)

Probably same engines but different ecu's

merlin24

iTrader: (1)

WRX RA has hydraulic heads and Cast dogbone pistons,the STi Vers 2 RA has top hat inner shims,better cams and forged dogbone pistons.

Mick

340BHP-WRX

iTrader: (6)

So if you had the 2 engines side by side,how would you tell which was the wrx or sti engine ?

muly

cams and heads are different along with the lifters, ecu/map etc, there are alot of difference between the wrx and sti

merlin24

iTrader: (1)

Camshaft out and see what lifters it has - or pull a head and drop a piston out to see if it's forged or cast.
Crank and rods are the same on both engines.
No easy way to tell 100% apart from a partial strip.

Mick

Normski

The version 2 (not sure about v1)Wrx Ra has the same solid lifter set-up as the STi Ra has it not?
It has the same engine red line of 7500rpm, where as the Wrx (and STi) is 7000rpm due to it's hydraulic lifters.

340BHP-WRX

iTrader: (6)

Did all STI RA's have red top manifolds then or did some versions have the normal silver manifold ?

merlin24

iTrader: (1)

STi Vers 1 and 2's had Silver Manifolds from the factory.