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Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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Old 01-18-2013, 08:53 AM   #1
My_06WRX
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Member#: 344000
Join Date: Jan 2013
Default From k20 to Ej255

Hi there, I just recently sold my cammed n/a 235whp 08 Mugen civic si and got a stock used 06 WRX 5spd. I am a honda enthusiast at heart and know nothing of the world of subaru engines and modifications and brands.

I want to hit 280ish-300ishwhp (dynojet results.) and was wondering what is needed to hit that mark. I want to hit that mark, but want three things specifically...I want to keep my WRX as QUIET as possible, reliable, and good for daily driving. I will not be tracking it or 1/4 mileing it, just every now and then pushing it for fun, and make the ladies feel that torque that I couldn't make happen with the honda. lols. Also, I am aware that I have the 5 spd transmission which is well known to be weak. but I am not modding extreme past its limits and do not abuse the tranny like dumping clutch or some shiit like that. I'm pretty confident that the 06 wrx tranny can withstand 300wtq just fine with just pushing it here and there a little bit doing some highway runs. unless you all say otherwise, I will shoot for a lesser whp/wtq goal. Like I said, I'm a noob, and lmk what you think and suggest.

What are your specific opinions of engine modifications, specific brands?

I know I could just research and I am very much so, this is just a thread to get some great opinions from people with more experience.

Quiet, Reliable, DailyDriver, 290ish whp!

With that said, lmk what you think!

This will be for an aspen white 06 WRX 5spd sedan! EJ255 engine.
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Last edited by My_06WRX; 01-18-2013 at 08:58 AM.
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Old 01-18-2013, 09:20 AM   #2
Boostedbob
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Join Date: Oct 2012
Chapter/Region: MWSOC
Location: Colorado, New Mexico
Vehicle:
08 Sti
OPB

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You can keep your stock intake on, but I would replace the dp, I'm not to sure on quiet cat backs would be, but I did have a Cobb cat back on my old 06 Wrx wagon pretty quiet IMO idling and when you get it on it you could hear it but wasn't obnoxious.

You will need a Cobb access port or go with open source tuning using a tactrix cable. I'm not sure if the Td04 will be able to hit the 300 ish mark maybe at sea level, however if you swap out to a vf39 or vf43 I don't see any issues with you hitting your goal. The transmission should be fine with the power numbers your looking at just take care of her, the transmission can take more abuse then what people give it credit for.

Edit: Make sure you get a tune, I can't stress this enough these motors are extremely finicky with mods, the only thing I can see you getting away with without a tune will be a cat back. The Cobb ap comes with stage 1 and stage 2 tunes and you can get a pro tune on it as well.
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Old 01-18-2013, 09:43 AM   #3
tuzzio
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Location: Southwick, Ma
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Welcome to the Subaru world my friend. My first suggestions for a quiet 3" exhaust would be a borla hush, or a Cobb. (or jna, gimmick, srs, Cobb replicas.) and a nice down pipe to go with it.
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Old 01-18-2013, 09:50 AM   #4
Leafy
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If you just want the ladies to feel the torque, you only need to go stage 2. A really good stage 2 can get you somewhere around 340ftlbs/240hp. My tune still needs more work but I'm at 320/230 according to the road dyno but the clutch slips in gears 3-5 if its wet out. So I haven't put more effort into dialing it in.
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Old 01-18-2013, 11:25 AM   #5
Dave D.
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Location: Menzel Lake, WA
Vehicle:
06 Red Ltd.Wagon
20g-xtr in the works.

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Keep the stock axleback exhaust. Get a downpipe, Sti intercooler and a VF39 turbo. And a tune.

Ready to rock 'n roll.

In proven power bragging there's a post where this setup ran a 12.9 quarter.

My car ran this setup and produced 295/350 on Maxwell power's dynocom.
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Old 01-18-2013, 03:57 PM   #6
FCmaniac
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Quote:
Originally Posted by Dave D. View Post
Keep the stock axleback exhaust. Get a downpipe, Sti intercooler and a VF39 turbo. And a tune.

Ready to rock 'n roll.

In proven power bragging there's a post where this setup ran a 12.9 quarter.

My car ran this setup and produced 295/350 on Maxwell power's dynocom.
This and done.
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Old 01-19-2013, 03:20 AM   #7
bacalhau16
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Location: Dartmouth, MA
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2011 WRX hatch
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I would certainly advise doing lots and lots of research. Subarus are not like other makes of cars and require a bit more attention and care to detail.
Lots of research, then modify.
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Old 01-19-2013, 08:01 PM   #8
some dude
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You can go to the regional forums and ask what tuners are in your area and which ones are recommended. Getting a good tune is very important.
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