I'm Planing on running a wrx headers, wrx intercooler, xs uppipe and ludespeed downpipe with a T3/T4. Would this set up bolt up alright or would the crossmember get in the way. Thank for any help that anyone can give me.

 

You would need the crossmember since the up pipe won't clear the stock crossmember. Not sure if the Ludespeed DP would work either. It might just be easier to use the Ludespeed entire kit since you know it will bolt up.

 

Don't do it man. Using WRX parts is up there with one of the biggest mistakes I've made. The intercooler doesn't fit without MAJOR cutting and moving of parts (including A/C lines). You'll also have to shave down the throttle body inlet and IC outlet for clearance. The turbo is too close to the intake manifold, so an intake pipe will have to be specially fabricated, or a new manifold installed. Besides, the Rex turbo is tiny and the IC a joke in the performance world. I guarantee you'll spend just as much as a kit even off e-bay. Not to mention all the time in the shop, exhaust shops, and machine shops. It runs good now, but it takes TONS of work to get every aspect working well. Go with a turbo kit that someone else has already worked out all those kinks in, if you want it to run well from the install.

 

Does your newer model RS have the WRX crossmember in it?

 

Yes, you'd still have issues with fitting these parts. Get a kit man. Stage 1 is like $2,500 or something. Also, to use a t3/t4 you'll need custom I/C piping to fit onto the WRX intercooler. Like a 180 degree loop (Read: $$$). The intake manifold (Although it looks the same) is slightly different on your car (02 and up) than a WRX manifold. It doesn't squat low and angle up, but sits flat. Not meant for a TMIC. Plan on rerouting A/C($$), and engine wiring harnesses. Also, heat shielding will need to be added to your t3/t4 to keep from soaking the I/C with warm ugliness. A t3/t4's efficient operating range (70%+) is over 15 psi. Not meant to run between 5 and 10psi. No I/C is the quickest way to damage your engine, the last thing you want when turboing anything. Think front mount or bar and plate top mount.

Just some things to think about...

 

True it would be easier to just get a turbo kit since you won't have to worry about switching the crossmember or doing any trimming to make the WRX parts work with the EJ25. Try to pick up a turbo kit used if you are trying to save some cash.

 

True cause its not really the cost of piecing it together as it is the creeping costs involved in a DIY turbo kit. No matter what you set your budget at the odds are fairly good that your not going to keep to that budget.

 

5psi on a T3/T04e with a .50A/R Compressor Housing and a 50trim wheel is just fine for a Turbo'd RS...

Zee

 

"just fine" is much different than "optimal". Using a t3/t4 requires the airflow to support it. Air flow that you won't find in cheap WRX pipes off of ebay, but in systems designed to run well together, which is what this thread is about.

 

Wrong this thread is about making it work and work well enough to enjoy...

If he wanted it to work optimal, he would drop $10000 on an engine build, engine management and a custom turbo kit...


So, with that in mind, I believe, "just fine" is what he'll deal with...

And, in case you don't know, most bolt on Turbo kits for non-turbo cars use a t3/t4 or similar and run 3-8psi...Even though the turbos can run about 20psi...

Zee