My current plan is to create my own cheap turbo monster 2.5RS coupe. First I want to swap my shortblock out for a STI turbo block. Then to get the necessary items to turbo. Controlling all this will be a Hydra ECU. My question is, when I swap the shortblock and turbo it will I have to use a 2.5RS exhaust? Or will I have to convert to using the WRX/STI exhaust. I'm a bit poor so I'm trying to do things in chunks that'll get things going in the right direction. So I was thinking of getting a stock STI catback attached to the RS. This way the exhaust will already be there once I start doing things.
not to thread jack, but please keep us posted as you go along, i have been wanting to do this for a little while now and would be interested to see the cost and time put in. goodluck with the whole build it will be sick when you are done!
I'd do a turbo upgrade first and really limit the boost. Driving a 2.5 STI engine with no turbo is going to be much slower than your 2.5RS.
if i was u i would try getting a turbo for the 2.5 rs small block.. and see how it works.. i bet it will have a very big difference and saves some money .. i dunno... maybe it's a good idea..
Well I still have to break in the STI shortblock before I go all turbo crazy. So it fits with my piece by piece plan. Also is cheaper to seperate it =P
have you thought about a refurb crawford stage 2 block, right now they are the same price as a sti shortblock
Are you going to upgrade the clutch and transmission? I don't know if the 2.5rs will be able to handle the additional horsepower and torque of the STi block. Also you might want to consider better brakes too.
I will be upgrading the clutch to one that supports around 350 pounds of torque. That should be plenty at first. The transmission should be fine if I don't go crazy and do launches all the time. A lot of ppl are making around 325horse/torque on the stock RS transmission and have yet to blow anything. So I will definitely be extra careful.I 've already got a ton of supporting mods in place. I've got my suspension pretty much done minus a few bushings. Got megan coilovers, superhuge front and rear swaybars, antilift kit and such. I've got got the an ver3 sti brake upgrade for the front and new pads/rotors for the back. That should help me turn and stop this beast. I have thought of the Crawford blocks. They're BEAUTIFUL!!! That might be the way I go. Right now I just gotta figure out the exhaust. But I think I've got it. The route I might possibly be going is to get a wrx exhaust manifold and do the turbo that way using stock pieces off of WRX/STI's. And I'll need to keep the STI exhaust I am going to get unmodified. I have thought about getting a turbokit for my stock engine, but it's too risky. Can only handle 6psi safely before I have to start upgrading internals and what not. With an STI block it'll be much much safer to boost. But I figure if I'm going to do it I might as well do it right the first tiemr ather than wishing I had did it differently. Besides I want to blow past an STI not catch up to it =) This is months off from coming to form. Doing this slowly as I'm gathering more parts and information for what I need to do. Will DEFINITELY keep everyone posted. Right now even without a lot of power I'm having a blast still with all the suspension upgrades.