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Old 09-07-2005, 03:38 PM   #1
012.5RS
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Default Turboing A N/A 2.5L

I am thinking of turbocharging my RS. Who's kits would you reccomend and where could i get them? My car has 83k miles so would i need to rebuild the internals? I'm figuring i will. And if so who would you reccomend for the internals? I'm planning on all forged. Also what boost would you reccomend when im done?
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Old 09-07-2005, 03:43 PM   #2
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dont be foolish. Do an engine swap.
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Old 09-07-2005, 03:51 PM   #3
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Look in the aftermarket forced induction forum for info
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Old 09-07-2005, 05:09 PM   #4
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No-dout....on what AaronWRX says

Hold out for a long or short block depending on your $$$ situation. I got my hands on a STI long block with ECU and full harrness w/1500 miles for only $3000. ( no turbo or TMIC ) That is what it will run you to buy internals and true out your cylinder walls and get it all rebuilt. But in the end it always falls on CASH flow and what U want

By the way......I got JE 2.5L pistons w/ rings and con rods to sell you if U do a build. I was goin down the road you are thinkin of till I came appon the STI block. I'll even drop em off you aint far away.....$350...........PM me if interested
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Old 09-07-2005, 05:50 PM   #5
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^^
what they say motor swap if you dont do it now you will later on.
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Old 09-07-2005, 06:27 PM   #6
Master2192
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How much boost do you WANT to run? The AVO turbo kit is a set it and forget it setup that will give you 5-6 psi of boost. This will make you faster than a stock WRX, without the tons of lag of the WRX. If you don't get any more power hungry than that, then you won't need new internals. But if you want more power than that, engine swap is just as easy

www.rallitek.com for the AVO turbo kit

Last edited by Master2192; 09-07-2005 at 06:33 PM.
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Old 09-07-2005, 06:33 PM   #7
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my kit is always an option as well

http://forums.nasioc.com/forums/showthread.php?t=805127

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Old 09-07-2005, 08:33 PM   #8
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Quote:
Originally Posted by 012.5RS
I am thinking of turbocharging my RS. Who's kits would you reccomend and where could i get them?
None!

Quote:
Originally Posted by 012.5RS
My car has 83k miles so would i need to rebuild the internals?
This depends on how much boost you plan on running.

Quote:
Originally Posted by 012.5RS
Also what boost would you reccomend when im done?
All forged internals? Who know's! Tranny, fueling and engine management plays a major role when you start pushing the boost. 5-6psi of boost to play it safe and your car will be fast enough. It gets addictive.
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Old 09-07-2005, 10:01 PM   #9
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Quote:
Originally Posted by impr25rs
Look in the aftermarket forced induction forum for info
wow..cus hes not here allready!
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Old 09-07-2005, 11:21 PM   #10
Master2192
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Quote:
Originally Posted by Kawikid20o2
wow..cus hes not here allready!
Someone moved it here...
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Old 09-07-2005, 11:54 PM   #11
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my bad i dont see anywhere that it was moved i thought it usually says that on the thread title. but what ever
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Old 09-08-2005, 09:53 AM   #12
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In the next couple of months my shop will be developing new kits that will be very competitive with current offerings.
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Old 09-19-2005, 08:33 AM   #13
012.5RS
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http://www.rallitek.com/products.asp...Y&HB=&ACC=&SP=

is this just the turbo or the whole setup?
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Old 09-19-2005, 11:00 AM   #14
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How about, instead of just giving our lame opinions, and being
ridiculously pessimistic and snide about this, we actually help
him out:

There are a number of options:

1) A good start would be to read some of the older posts in here
and do a search for this. Honestly, there are tons, and I mean
tons of posts about this.

2) A second good resource is Unique Motorsports. You can get to them
at http://www.uniquemotorsports.com. They have a lot of info on
making your own turbo setup.

3) There are several places that make turbo kits for the RS, to include
Forced Air Technologies http://www.forcedairtech.com and AVO, which
can be purchased at SPO Motorsports http://www.spomotorsports.com
There are a few more which are outlined in the various posts.

4) A supercharger is an option, but there are very few prefabbed kits
out there for subarus. Again, there are a couple very lengthy threads
here about superchargers.

Turbo lag is relative, and honestly, going from NA to turbo doesn't add
any lag, because being NA is like having lag that never ends. It'll just
adjust your power band so that after 3000 RPMs, you'll really have power.
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Old 09-19-2005, 12:38 PM   #15
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Quote:
Originally Posted by 012.5RS
http://www.rallitek.com/products.asp...Y&HB=&ACC=&SP=

is this just the turbo or the whole setup?
Just a turbo. The momentum EJ5-40T is capable of 400hp at half the price.
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Old 09-19-2005, 02:33 PM   #16
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Quote:
Originally Posted by dangerousatom
No-dout....on what AaronWRX says

By the way......I got JE 2.5L pistons w/ rings and con rods to sell you if U do a build. I was goin down the road you are thinkin of till I came appon the STI block. I'll even drop em off you aint far away.....$350...........PM me if interested
PM me with specs and more information. I might be interested...
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Old 09-19-2005, 02:59 PM   #17
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just piece your own kit together and don't skimp on tuning, and don't run more than 8 psi.....you'll be fine
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Old 09-19-2005, 10:06 PM   #18
012.5RS
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Quote:
Originally Posted by Matt Monson
PM me with specs and more information. I might be interested...
sorry man i already called dibs on them. and hopefully will be picking them up on sat.

im looking for maybe like 300hp/300TQ at the wheels... now im used to V8's so you'll have to excuse me, will running 8psi enable me that kind of power? I'm buying the pistons/rings/rods of dangerousatom. They are JE's(which i know from drag racing my ponchos are great pistons) stock bore(for what im getting em for i dont care about not boring it out), they are forged good up to 30 psi and are N2O friendly. Dished out for a DOHC head like the WRX or STI but from what I understand they can be used in a SOHC head setup like in a NA 2.5RS. The pistons will take the block to 8.5-1 compresion. The rings that he got with them were Turbo Nitrous(im assuming moly) for heavy boost and an optional shot of N2O.

Now how high might it raise the cr from 8.5 under 8-10psi? Does anyone have a website that has calculators for this? Can i bolt the DOHC head to my short block? Also pls lemme know any odd ball stuff that i might need. I still wanna get a forged crank, does anyone know of a company that makes them? i know i gotta upgrade spark and fuel... duh. But hopefully when im done ill be dancing like this...


I found these two kits from Forced Air: both 5psi

http://www.forcedairtech.com/turbokits_gc8_stage1.html

http://www.forcedairtech.com/turbokits_gc8_stage2.html

There is also this AVO kit:

http://www.spomotorsports.com/Catego...tomerID=336143

its like $1500 more than the stage 1 kit. i think it might be worth the extra money for reliablity and power sakes.

Is the intercooler worth the extra $1000? I know sometimes ive seen it where the intercooler will actually make a car slower if it is running low boost like 5psi. Also im sure the pistons and rods im getting will handle a baby 5psi. Do you think its worth buying a forged crank for this little boost? Can i always boost the psi up? This seems like a good deal since its everything you need. I think ill probably go with the stage 1 since this will be a daily driven car.

Last edited by 012.5RS; 09-20-2005 at 08:19 AM.
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Old 09-20-2005, 02:26 PM   #19
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Intercooler is more for reliability in a changing environment (or hot climate) at 5psi or so. Apparently the intercooler itself is not cheap and of course people will make a bit of money on top of it. I'm guessing you're building up your EJ251 instead of swapping in an EJ257? I'm not sure if it's wise to do that when you're trying to get 300whp - you're lowering your compression so you would need to run about 14psi or so to be near the STi power level (STi runs 8:1 and 14psi and their heads probably flow better than the stock SOHC head)
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Old 09-20-2005, 09:10 PM   #20
012.5RS
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can i put the DOHC head on my short block?
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Old 09-20-2005, 10:10 PM   #21
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Yes, but it's more trouble than its worth because your stock ECU won't know how to fire that
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Old 09-21-2005, 12:50 AM   #22
012.5RS
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well i can always port my head, and to up the cr i can just mill the head so i wont have to boost 14psi
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Old 09-21-2005, 01:25 AM   #23
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Boost it......Do it right!"low to moderate boost" When you fry the rings have local machine shop you trust,rebuild the stock block with forged crank,rods & lower compression forged pistons"run about 2k. Dont waste thousands off dollars and countless hours on a clip swap or sti block swap. Short block rebuild will net you way better pay-off with a real performance build. This is if you can handle an engine pull and tune yourself ,If not...Then yes a clip swap is a good option for you

P.S. Keep SOHC, less parts=cheaper in the long run and they flow close to the same anyways, dont mill the head its just asking for trouble....the idea is to lower compression...unless you like 108 octane gas. EJ251 has 10:1 you dont want to increase that,thats were detnation occurs

Edit: This is all "IMO" its also my plan.

Last edited by Boom05rs25; 09-21-2005 at 01:33 AM.
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Old 09-21-2005, 07:47 PM   #24
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thx for the support man. I'm getting JE forged pistons that drop it to 8.5:1 cr. is that a good range? I wanna get a kit from Forced Air Technologies that is 5psi and adds approx 60-80hp. Of course the turbo comes after the TWE Stage II Cams and Stage II Head. I'm getting the JE forged pistons, rods and rings from a member here on sat for $350. Then all i need it the crank for the bottom end. I figure with the forged internals i can bump it to 10psi max and reach atleast 300hp.

Last edited by 012.5RS; 09-21-2005 at 07:58 PM.
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Old 09-21-2005, 09:31 PM   #25
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If you drop from 10:1 down to 8.5:1, you lose some low end. At 8.5:1 I believe you need quite a bit more than 10psi to reach 300 at the crank.
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