Confused on what to do - Subaru WRX Forum
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#1 Old 08-01-2008, 12:54 PM
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Confused on what to do

I am deffinatly interested in getting a up pipe...but idk what to do next basically I think my goal is to get around 280-300 whp from what I was told with the dyno tune I would probably come reasonably close to the 280 whp mark but im not so sure if thats correct?

In general what modifications could I do to acheive between 280-300 whp??

Current mods Cobb stage 2, New high flow air filter, Spark Plugs.


(Keep in mind I do have a pretty like limited amount of money...I am taking a guess that by september I will have approx 1,000 some odd dollars to spend.)

Also my car is Automatic, 2003 with 64,000 miles on it Idk if those specifications help or not.

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#2 Old 08-01-2008, 01:02 PM
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280whp from a TD04 turbo? Think again. On a mustang dyno with a stock turbo, you'll be 200-220whp. Add another 20whp if you're on something higher reading. That's with or without the up pipe which is, again, a safety mod not a performance mod.

300whp requires a larger turbo. Many people don't even get 300whp with something like an e3-16G. The stock EJ20 puts down about 165whp remember.

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#3 Old 08-01-2008, 01:10 PM
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I see, so Basically its impossible, at least with the amount of money that I can put on the table we'll in that case what do you think with 1,000 dollars I could do with my car now to push out some more horses?



(I was looking through the classifieds and I noticed some one selling a IHI VF30 Turbo for 500 dollars...now idk with my remaining 500 dollars if I would be able to do the mods necessary to enable my car to run well.)

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#4 Old 08-01-2008, 01:29 PM
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A little more and you can get a 16G if you look. They are re-buildable too and internals are fairly cheap from what I found (I have been researching this). then injectors and bigger TMIC and another tune or Cobb has a 16g map to run until you get money for a protune. I would save a little more and these mods will probably be within reach. Cobb says something like 340hp at the crank on 93 octane I believe? 25% loss of power to the wheels is 255whp. That getting closer.

Still love my 4 rings, but now all I see is stars.
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#5 Old 08-01-2008, 01:38 PM
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Yeah I will deff consider that and start doing some research to see whats up exactly, Do you guys have any other suggestions like lets say I wanted to steer away from a aftermarket turbo, Any other things I could do with my estimated price limit (1000) that could perhaps, if not crank out enough power to reach my goal, give me some decent/noticeable gains?


Also I think it might be less then 25% loss because when looking at the IHI VF30 Turbo it said it would put you at approx 340 hp at the crank and 270whp, Im thinking it might be more along the 20% lose of power to the wheels.

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#6 Old 08-01-2008, 01:50 PM
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You're/we're limited by the stock turbo. A protune might squeeze out a few more ponies over the Cobb map, other then that, turbo is the next step up. Put that $1k into sway bars and end links and put the rest towards your 16g or a pro tune.

Still love my 4 rings, but now all I see is stars.
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#7 Old 08-01-2008, 01:56 PM
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What the hell is the mod for a auto wrx, tq converter, i dont know. Stg 2 isnt bad. What about suspension, gauges, brakes........There are a lot of other things than power

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#8 Old 08-01-2008, 02:02 PM
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Drivetrain losses on the Subaru AWD setup are unusual high. Most RWD cars have about 17% drivetrain losses. FWD cars maybe 15%. Even AWD DSMs are generally low 20s. Subaru's system is a full equal length drive to each wheel though so you're going to see ranges of 25-30% drivetrain losses mattering on the dyno. Thus, when you see a turbo speced, it's often in reference to another car's drivetrain losses which are lower.

The usual budget option is fuel pump, sti injectors, used VF39, used STi TMIC. If you're good, you can get all that for $1000-$1500 and with your exhaust (you'd need to add an up pipe as well), you can use the cobb map for that setup.

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#9 Old 08-01-2008, 02:11 PM
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I think being that I am a poor college student and my moms lack of approval of me dumping alot more money into my car my best bet is probably as follows (At least for the time being.)

-Up Pipe
-STI hood scoop ( Mostly because I love the look of it.)
-Boost gauge/Controller...I really do not know a awful lot about boost gauges or controllers or what ever but I was briefly looking at this one in particular...AEM TRU BOOST Electronic Boost Controller : BoostController.com LLC - America's Source for High quality turbo boost controllers, silicone hose, and more performance products - 877-836-6155- precision boost control. Turbosmart Warehouse Distributor
Like I Said I really don't know much about this but im assuming this is a boost gauge as it tells you how much boost you are running as well as a boost controller because its in its name so does that mean I just basically push a button on the little gauge and it can adjust the level of boost I want to be running as need be?? Also if that is the case what is the max boost I would want to run for every day driving/a race?
-Dyno Tune

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#10 Old 08-01-2008, 02:18 PM
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don't get a boost controller
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#11 Old 08-01-2008, 02:23 PM
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Really?

Actaully if my math is correct I might be better off going with the v39 set up I found STI fuel pumps for 89 dollars, STI TMIC for 250, STI Injectors for 450 and a v39 going for 439 so in total thats like 1200 dollars and change

Also why would I not want to get a boost controller?

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#12 Old 08-01-2008, 02:26 PM
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I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post! I will not double post!

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#13 Old 08-01-2008, 03:14 PM
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Because your ECU already acts as a far better boost controller and can be dynamically programmed with the Cobb. Not only that but the ECU has lots of other data to adjust boost levels from to keep your motor safe and happy.

EDIT: Also, the STi hood scoop for the 02-03 model is not that much larger than the one you got on there. The large "shovel scoop" (pictured in my avatar) is designed for the 04-05 body style only. They make replicas that look like the 04-05 STi scoop but fit on the 02-03 but frankly, they look stupid. Your hood is rounded and doesn't look right with the squared off scoop.

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#14 Old 08-01-2008, 03:34 PM
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ah i see...yeah I was talkn to my dad he wont let me get a turbo he said once you "get into that stuff you start running into problems" He said get the up pipe the hood scoop if you want it and the dyno tune if its worth it other wise leave it alone, but I did have a thought what about headers?? I've heard getting a good pair of headers give some pretty decent power gains?

Also if not a boost controller would it be wise to get a boost gauge or are those the same thing?

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Last edited by DreamEvil; 08-01-2008 at 06:43 PM.
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#15 Old 08-01-2008, 10:43 PM
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a boost gauge just tells you what boost you are running at and a boost controller makes it so you can adjust your boost witch also tells you what your boost is. as said before the boost controler is a bad idea as the cobb raises the boost and changes the feul curves and stuff. i would just get the uppipe for now and just do things that make your car nicer to drive as in the long run you will be happyer with them then a little more power. i would suggest emailing jason at Pricematchedparts and tell him jake horth sent you and he might give you a deal. you can also im him on aim his name on there is pricematchpart he is a great guy and gave me a good deal.

O2 PEARL BLACK WAGON with some modds
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