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Old 10-27-2008, 08:18 PM   #1
lemons
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Default I want to turbo my 05 RS

As the title says, I want to turbo my 05 RS, but reliably. I can get a hold of a cheap OEM top mount intercooler and a vf39. I know I need manifolds, engine management etc.. but if i do this will my motor handle boost reliably? Or should i think about building the motor before the turbo?
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Last edited by lemons; 10-27-2008 at 08:27 PM.
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Old 10-27-2008, 09:41 PM   #2
freeride
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Build before you add.

vf39 it too much turbo for a stock block and a waste at low psi.

Build the pistons and rods and then you can add a decent amount of boost to it.
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Old 10-27-2008, 10:12 PM   #3
lemons
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So is my bottom end okay? Pistons and rods are sufficient to handle boost?
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Old 10-27-2008, 11:29 PM   #4
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i gotta 03 RS that we turbod. My shop makes the complete kit for this. comes with the up pipe, DP, intake, turbo, TMIC, FMU boost/retard controller, and voltage clamp. check out forcedairtech.com many people have our kit.
You can either do it with our kit or go DIY. all you really need for yours is the fuel and turbo and exhaust mani. I belive 05 RS can be opened sorced for tuning therefore you do not need the voltage clamp or boost/retard controller. As long your tuned right should be able to run 8lbs safely, this means a rich mixture during boost and plenty of retarding while in boost. This will in the long run shortin the life of your shortblock, but then throw in the sti 2.5 shortblock and run 17psi all day.
You can run the whole wrx setup. I.E: injectors, TMIC, turbo, exhaust mani, down pipe, you will need a wally 255 fuel pump, and a great tuner and i see no problem with you runnin 8-10psi. LMK
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Old 11-30-2008, 03:28 PM   #5
lemons
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So can someone make a list of everything you need to turbo an RS?

This is what I have so far:
Intercooler
Turbo
up pipe
DP
intake
injectors
exhaust
fuel ppump
tune

Am I missing anything?
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Old 11-30-2008, 09:57 PM   #6
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Some gauges wouldn't hurt, mechanical Boost gauge?
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Old 11-30-2008, 10:34 PM   #7
Boostinwagon
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You might as well spend the 1700 and just get an sti shortblock and boost the **** out of it. This way you wont have to worry about it.
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Old 12-01-2008, 12:38 AM   #8
lemons
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Will my stock pistons cams etc. fit onto the shortblock? And how much approximately will a full sti swap cost?
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Old 12-01-2008, 03:18 AM   #9
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The shortblock is basically the assembled block without heads, manifolds. It has the crank, pistons etc built in. I wish I could fill you in on whether your RS heads would work on the 2.5l block but I'm not sure.
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Old 12-01-2008, 05:56 PM   #10
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most say they will but kinda wierd as to how that is....I think low compression psitons and forged rods will yield you good boost gains...just alot of work just to boost really..where as you'll spend the same amount for a swap...but if your going to be participating in the build you might enjoy it also..really its up too you but from what you've listed as a basic swap or boost build that sounds about right..440 injectors will work just fine no need for say 880's or so....most up pipes are attached to the headers so just get headers with it welded..avoid anthing bolted into headers...down pipe is fine cause it as a flange...
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Old 12-01-2008, 07:08 PM   #11
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Quote:
Originally Posted by lemons View Post
Will my stock pistons cams etc. fit onto the shortblock? And how much approximately will a full sti swap cost?
Quote:
Originally Posted by Sooby Soldier View Post
The shortblock is basically the assembled block without heads, manifolds. It has the crank, pistons etc built in. I wish I could fill you in on whether your RS heads would work on the 2.5l block but I'm not sure.
IMO if you want to boost it, go with the brand new sti shortblock from the factory. Like Scooby Soldier said, the block comes assembled with internals right out of the box.

As for heads, be on the lookout for sti heads that need fixing (like they have a bent or dropped valve) and have the 3 angle valve job with springs/retainers done.

Once all is said and done, you can sell your longblock and drivetrain setup and recover some of the cash.

I'm in the middle of an sti swap right now into my 03 wrx wagon. It ends up being quite expensive... I mean once you have an sti longblock (about $1750 from dealership) with drop in pistons (about $450 depending on brand), and pnp'd/upgraded springs/retainers sti heads (about$700 for parts and labor), your not going to want to run a 39 on it. Even tuned on the 39, over 320 wtq would shred a wrx tranny (usually 3rd gear). Also needed are ARP headstuds and new head gaskets (around $400?).

It gets expensive because you can't just do the motor. You have to do the tranny and the brakes just to be safe and in order not to break anything and that is where the $$$ goes. Right around $4000 goes to the tranny/hubs/axles/brakes swap not to mention labor if you're not doing yourself. You will also need 5x114.3 wheels. Sti engine/car harness/ecu/cluster will run you around $1500 (for parts no labor).

Also need turbo, injectors, fuel pump, intercooler, blah blah

And I know im missing a bunch of stuff but this will start to hint at an idea of price. Notice all prices are an estimate, it depends on what type of deals you can find and get.

Last edited by howfast?; 12-01-2008 at 07:13 PM.
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Old 12-01-2008, 08:18 PM   #12
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good write up...so go buy an sti..simple way.....or go buy the stuff to give you sti power the intresting and braggin rights way. No but really this is why I'm going with 06 wrx swap mainly for the tranny..then let my money build again and have the tranny installed with seriously strong dogbones to handle the power.....around here most guys tear up second but I guess 3rd is just about right all so that hard shift high RPM on the gear can tear it to shreds.
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Old 01-05-2009, 02:55 AM   #13
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Is it worth building the stock RS block or would it just be a waste of money?
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Old 01-05-2009, 03:19 AM   #14
shanemono4
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boost your 2.5 engine using stock wrx parts. no vf39. and then when youve got the time and money, get yourself that short block.
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Old 01-05-2009, 06:34 PM   #15
supernick77
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Default how much boost on a 2.5?

i have a 99 leg gt. how much boost can you put at the 2.5? i heard the heads are weak as it is?
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Old 01-05-2009, 07:53 PM   #16
shanemono4
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with a safe tune, good gas, rrfpr, etc... 8 or 9 lbs. seems to be the limit.
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Old 01-06-2009, 05:27 PM   #17
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You can build the the stock 2.5 with sti internals to lower the compression and make it hold alot more boost.

The heads on a legacy will work just fine.
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Old 01-07-2009, 12:25 PM   #18
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i have a ej251 hybrid built block from my SOHC '00 RS with mahle pistons, stock sti rods, cometic hg, arp head studs, and delta cams w/ vf39 and perrin 800cc inj all tuned on greddy emanage ult running 17psi all day long and it didnt cost me all that much to do it. i also ran my stock block at 8.5psi for 2 years before one of the head gaskets finally gave out and i ran that setup on completely stock engine with a td04 and tuned with emanage ult... it was fun back then but now i have a blast!!!
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