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Old 11-27-2005, 10:28 PM   #1
riggs
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Default Looking to upgrade the turbo setup on my 06 WRX..

Well,

I sold my Corvette to get the WRX and I'm having HP withdrawals...

I'd like to see 400whp out of the WRX as I have several local EVO's that are modded and are around this HP level...

I just ordered the Cobb Accessport with Street Tuner software, Megan Racing downpipe and testpipe...

I am ready to pick up a twin-disk clutch from Exedy, and a FMIC off Ebay (since it appears there is one brand in particular that seems to be a good buy.)

I'm hoping the redline can be increased to at least 7,000 RPM in factory form and maybe to 7500?

With the current 6500 RPM redline it's going to be hard to find a turbo setup that is going to make decent power and still have a respectable powerband...

I'm curious to hear what people suggest for this motor as it sits...GT30R?
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Old 11-27-2005, 10:32 PM   #2
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Trade it in on an STI now while its still worth something and you havent dropped a ton of money on it.

I am serious.

400whp, reliably, will take a METRIC TON of money. MUCH more than the difference of the wrx and an STI. The STI will be a WAY stronger base to build off of.

I know thats probably not what you wanted to hear, but I am trying to save you a load of headaches.
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Old 11-27-2005, 10:34 PM   #3
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same here and then add a superzilla deadbolt turbo and bam, with some assisting mods 400 whp
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Old 11-27-2005, 10:36 PM   #4
riggs
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I dont see how it will cost a fortune to make 400whp....I know the factory internals can take it.....I feel confident...

As long as I dont have to open the motor to make my HP goal, then I'm content with the car..

Things like a FMIC, clutch, etc would need to be done to any Subaru build going to that level I would assume..
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Old 11-27-2005, 10:51 PM   #5
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Quote:
Originally Posted by riggs
I dont see how it will cost a fortune to make 400whp....I know the factory internals can take it.....I feel confident...

As long as I dont have to open the motor to make my HP goal, then I'm content with the car..

Things like a FMIC, clutch, etc would need to be done to any Subaru build going to that level I would assume..
Definately clutch, probably FMIC, and MAYBE a tranny. The 02-05 took 300whp ok if driven right, and I hear there are upgrades in the 06 box, so maybe it can handle another 100whp...

It will cost a fortune because most likely you will end up having to do pistons at the minimum. A LOT of STIs have blown up ator about 400whp. (a lot have survived too though..)

400whp on an STI motor seems to be like 300whp on the 2.0wrx motor. A lot of evidence points to it being the "average reliability limit" of the motor. The problem is they havent been around long enough for us to know 100% yet.

And there are differences between the WRX 2.5 and the STI 2.5. I dont know what of those differences are in the lower end, but you should check that out before you start. What makes you say you know the internals can take it? No one has done it on an 06 so there is no real evidence that it can yet (or that it cant) If the internals are the same, it SHOULD be ok, if tuned perfectly. JUST FYI I know several people who popped their STI motors at 400whp with a good tune.


I am going to go out on a limb here and say you are going to end up spending well over 10k to do this reliably. You MAY get lucky and be able to just toss a rotated mount on there, and make 400whp like all the mid 13 sec STI's in proven power though On a serious note, find out what, if any internal differences there are from the STIs 2.5 to your WRX 2.5. I know there are some, I just dont know what. Basically find out if the rods and pistons are the same. Then find out if the heads/cams are the same. Because that will be the next barrier. Flow in the heads...
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Old 11-28-2005, 12:04 PM   #6
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someone already had a 35r on a wrx 2.5 ... didn't last long IBbyebyeringlands
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Old 11-28-2005, 12:39 PM   #7
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Yeah.. ARM and a leg is right... Now it will be different than what my experience is since I came from the 2.0L WRX world.. and I would be interested in knowing where the 2.5L WRX engine will hold 400whp info came from as well.

I would say that 10K at least is what you will likely be looking at to get to that HP that you want. Now if you are skilled enough to do all the work yourself then you will be ahead of the game. But it is the things that you don't expect like the incredibly small headers that will hinder flow from your GT35/30 that get in the way... Just a ballpark without labor you will be looking at the following approximate prices (speaking from experience and not close to reaching the 400whp mark)

Exhaust:
=======
- Turboback exhaust $1000
- Headers $800
- Shorty intake $200

Engine
======
- COBB or Crawford Block with internals to support 400whp $3000
- Injectors 800cc'ish $800
- Fuel Pump $150
- Bolton Gt35R all included kit (price from vividracing) $3700
- FMIC - $1000
- EcuTek & Tune $1000

Transmission
==========
- Sti 6-speed to handle power - $6000
- Sti 6-speed swap stuff (driveshaft, diff, halfshafts,rear brakes) - $1000

That's what I can think of off hand... things will break as you go through this process.. you can take the approach of pushing the stock 2.5L until it breaks and then put in the STi Shortblock, but you may damage your heads. But as a total for the above you are looking at $18,650

There are other things that may need to be upgraded as well since your stock CAMS don't have the topend that the STi heads do. And I think I am missing a Clutch and flywheel as well.

All of this plus installation labor. 400whp is attainable but you have to start with the right platform, and I don't think the stock WRX 2.5L block and tranny will get you there.
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Old 11-28-2005, 12:50 PM   #8
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Quote:
Originally Posted by brcewane
you are looking at $18,650
and thats not including the stiffer suspension or better wheels/tires on an sti. you'll be putting down 400whp on re92s? : psychic voice : i see 3.0 60ft's in your future..
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Old 11-28-2005, 01:47 PM   #9
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There's a thread in the driveline forum about swapping in an STI trans for 3k total...you don't need the rear diff and everything else however it is nice.

Like someone else said though for those hp goals why not start with an STI?
Mike
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Old 11-28-2005, 02:52 PM   #10
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Buy your Vette back. 400HP on a WRX is a leap. While the new 2.5L block is different, that was the HP range where the timebomb starts ticking on both the motor and tranny of the 2.0L. You might be able to get 400 out of the motor, but it will cost you and there aren't enough 06 WRXs running that to say wether it will last longer than a month at that HP level or not.

The 2006 WRX 5MT is unchanged except for dual cone synchros on first gear. Your tranny will DEFINATELY take a poop at 400WHP. DO NOT buy a clutch now. Getting a clutch without seeing your final TQ numbers is a waste of time and money as clutches should be suited to your TQ number. If anything, stick to your stock clutch to the point where it slips like crazy as a slipping clutch is better for your gears. Not slipping on a "better" clutch will only accelerate gear failure. For that WHP goal, you will want to do a 6MT swap or get a PPG gearset which is a little cheaper and easier.

I'd suggest you do some research to bring your knowledge up to speed by viewing this: http://forums.nasioc.com/forums/show...hreadid=533787
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Old 11-30-2005, 08:13 AM   #11
riggs
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I appreciate everyones feedback, and just think we all have to wait and see what the 2.5L block will hold reliably...

It seems like everyone refers to the 2.5L as they would the 2.0L in terms of power capabilities and I just dont agree with this...they are very different motors, and I just am having a hard time believing this block can't make 350-400whp reliably on factory internals..

My only concern are the pistons at this point....and I haven't talked with anyone that has opened one of these motors up to confirm or deny whats in there...

When the 06 was first released, I remember the local Subaru parts department telling me the WRX and STI had the same part #'s listed for the rods, pistons, etc...

It wasn't until at minimum a month later if I recall correctly that the part #'s were changed...

Which makes me wonder if perhaps the first WRX's released may have used STI internals...

While I am a new owner to a WRX, I've seen several (02-05) on the dyno with factory blocks and aftermarket turbo's...and the tuner didn't push them past 300-325whp... due according to him to the weak tranny/drivetrain....although I know the block is probably getting questionable at that point.

But with the 2.5L I just dont see the factory block not being able to take another 50-100whp...

I'm not as worried about the drivetrain on my car, as I dont plan to be doing any racing from a stop...which is why I was just looking to get a upgraded clutch and be done with it (The wife has put an end to my days at the drag strip. We just got married back and June and she got enough of that with the Corvette.) - I'll post some pics now and videos when I get off work...

I just want a great street car setup that I can play with when that unsuspecting Grey Haired Corvette Driver decides to rev on me...(on a private deserted country road of course )

If I'm confused, I do apologize for my ignorance...feel free to flame me...

Last edited by riggs; 11-30-2005 at 08:42 AM.
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Old 11-30-2005, 08:29 AM   #12
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CURRENT CARS:






Last edited by riggs; 12-04-2005 at 11:31 AM.
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Old 11-30-2005, 08:42 AM   #13
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You don't need a 400 WHP WRX to keep up with a Corvette. Some of us have kept up to Z06 Corvettes with the stock turbo.
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Old 11-30-2005, 08:51 AM   #14
riggs
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Quote:
Originally Posted by Unabomber
You don't need a 400 WHP WRX to keep up with a Corvette. Some of us have kept up to Z06 Corvettes with the stock turbo.
Ah.....

Videos as proof, lol?

That's hard to believe as you are looking at a 330-340whp Vette vs a what 200-220 whp WRX? The Vette and the WRX are about the same weight wise....Yeah, I'd have to see some videos as proof of that.
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Old 11-30-2005, 09:03 AM   #15
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Hehehehehe! You need to get more into the Scooby World my friend! Just because the turbo is stock doesn't mean the WHP is stock.

I won't go into details (no video, sorry) as this isn't a street racing forum, but the key words are KEEP UP as in door to door.
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Old 11-30-2005, 09:35 AM   #16
riggs
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Quote:
Originally Posted by Unabomber
Hehehehehe! You need to get more into the Scooby World my friend! Just because the turbo is stock doesn't mean the WHP is stock.

I won't go into details (no video, sorry) as this isn't a street racing forum, but the key words are KEEP UP as in door to door.
Look man, the 02-04 Z06 (405 Crank HP) model can run 11's with just drag radials and no other supporting mods...and this has been done by numerous people...Check out Corvetteforum.com and search for username "Ranger"...(Just one guy I can think of off the top of my head without having to browse the forum for usernames.)

I seriously doubt a 02-06 WRX (NOT STI) even pushing the TD04 turbo to the max is going to run 11's.....no matter what kind of tires it has, etc...

The Z06 weights roughly 3100's, with the WRX at roughly 150-200 more?

I'm not knocking the WRX as I own one and love the car, but I have owned enough high HP cars to know the capabilities of both of these...and I simply am not buying it...
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Old 11-30-2005, 09:37 AM   #17
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Check this out....can get you the HP goals you want for sure...with room for more.

http://www.ultimate-racing.com/CustomerCars/Phil.shtml

400whp is easlity obtainable via that setup.


Peace,


Scoobs
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Old 11-30-2005, 09:43 AM   #18
riggs
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Quote:
Originally Posted by Scoobs2002
Check this out....can get you the HP goals you want for sure...with room for more.

http://www.ultimate-racing.com/CustomerCars/Phil.shtml

400whp is easlity obtainable via that setup.


Peace,


Scoobs
Thanks for the post, but was this the car that only stayed together for like 2 days?

That's more than I need, but like I said GT30R is what I'm thinking....I'm only asking for 400whp MAX...that's more than enough for any daily driver...
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Old 11-30-2005, 10:33 AM   #19
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Quote:
Originally Posted by STi(m)
and thats not including the stiffer suspension or better wheels/tires on an sti. you'll be putting down 400whp on re92s? : psychic voice : i see 3.0 60ft's in your future..

actually many people like used RE92s as drag tires. A couple guys claim to have some of thei best sixty foots on them.
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Old 11-30-2005, 10:40 AM   #20
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That car was pushd to the limit. If it would have stayed @ 400whp it would have no issues and stay together much longer than that.


Peace,

Scoobs
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Old 11-30-2005, 12:57 PM   #21
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Quote:
Originally Posted by riggs
Thanks for the post, but was this the car that only stayed together for like 2 days?

That's more than I need, but like I said GT30R is what I'm thinking....I'm only asking for 400whp MAX...that's more than enough for any daily driver...
Only 400whp IMO is no different than 450whp. I wouldnt run an sti block at those power levels for long w/ out atleast throwing in some pistons.
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Old 11-30-2005, 01:12 PM   #22
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Like what was said above buy your vette back or trade in your wrx for a evo. At least with the evo you can hit 11's no problem on the stock turbo with few supporting mods at a minimal cost, you gotta love the big ass 10.5cm^2 housings
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Old 11-30-2005, 01:19 PM   #23
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I don’t think so man....400whp and 450 are much different power levels and abut 5 psi of boost any way you look at it. 5psi is much more to run then not to. I ran a stock block and heads ej205 (old turbo and setup) with a GT35R @ 19 psi 389whp for 1.5 years winter time and all...boosting every day and never had one problem. The guy who bough my block is still boosting a 20G to 19 psi on that same block with no issues. Now if I was to push say 420-440 whp witch is about 50whp more and 5-6psi more I’m sure the longevity of the block would decrease a great deal...it probably wouldn’t be around now and still running.

Peace,

Scoobs
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Old 11-30-2005, 01:19 PM   #24
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Quote:
Originally Posted by fastwrx006
Like what was said above buy your vette back or trade in your wrx for a evo. At least with the evo you can hit 11's no problem on the stock turbo with few supporting mods at a minimal cost, you gotta love the big ass 10.5cm^2 housings
+2342948294284

And here I am considering getting a vette
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Old 11-30-2005, 01:37 PM   #25
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Quote:
Originally Posted by Scoobs2002
I don’t think so man....400whp and 450 are much different power levels and abut 5 psi of boost any way you look at it. 5psi is much more to run then not to. I ran a stock block and heads ej205 (old turbo and setup) with a GT35R @ 19 psi 389whp for 1.5 years winter time and all...boosting every day and never had one problem. The guy who bough my block is still boosting a 20G to 19 psi on that same block with no issues. Now if I was to push say 420-440 whp witch is about 50whp more and 5-6psi more I’m sure the longevity of the block would decrease a great deal...it probably wouldn’t be around now and still running.

Peace,

Scoobs
What im trying to say is that once you have gone that far "400whp" what difference is another 50 gonna make . I would love to see a factory wrx long block hold that kinda power! I just dont see it happening.
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