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Old 09-16-2007, 09:49 AM   #1
xspeedracerx
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Question 06-07 Wrx Vs 06-07 Sti


Alright I am fairly new to the Subaru world, but i know that my next car will be a Subaru but i'm not sure about the diiferences between the wrx and the sti. I know i want one or the other in an 06-07, so please nobody try to say get a bug-eye or or blob-eye, i want an 06-07. What i'm looking for is this........

What are the differences in the engine?
What are the differences in the transmission?
What are the differences in the suspension setup?
What are the other differences i should know?
What are the Pro's and Con's to both?

I am looking to build a streetable 500 whp and torque car. I've am tired of playing with cars that simply dont make me happy thus why i want a subaru wrx or an sti. All help in making this decision will be greatly apprecaited.
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Old 09-16-2007, 09:52 AM   #2
xspeedracerx
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One other thing on both cars I do not favor the TMIC, with a FMIC what am I losing and gaining both parts wise(replaces intake right?), and performance wise?
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Old 09-16-2007, 09:56 AM   #3
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Your going to get a lot of responses like "search noob" but I'm gonna try to help you out.

WRX has td04 turbo, STi has vf39 (2006) or vf43 (2007)
I believe the WRX has a slightly higher compression ratio than the STi?
STi has larger intercooler
STi has 6-speed with DCCD and better differentials
WRX has 5-speed with a 3rd gear thats prone to breaking
Of course STi has stiffer springs, better shocks

If all you are looking for is straight line performance, get the WRX because it'll be cheaper.

I've just pointed out the obvious. Other people will chime in with more
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Old 09-16-2007, 09:58 AM   #4
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With FMIC the benefit is mostly that you lose the heat soak from the engine. You'll also experience more turbo lag, especially with the stock turbo.
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Old 09-16-2007, 09:58 AM   #5
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There are quite a few differences in the two cars. Im not going to put all of them down, just some that I do know of.

Engine- Intercooler, Turbo, some other escaping me as its ****in early.

Transmission- WRX's have 5 spd tranny's as upposed to the STi's which have 6 spd and stronger tranny. From what I have read the WRX tranny is good to about 350-400 whp.

Suspension- STi's have stiffer and lower springs, better struts, different sway bars.

Other Differences- STi has the park bench wing and the upper level interior where you can get a downgraded interior with the WRX in the TR model.

My Opinion- The STi is a ridiculously nice car. It is mega fast and track ready out of the stealerships. But, there is a new way of spending less and getting the same, if not more. I bought a left over 06 WRX TR (Tuning Ready). I paied 20.5 k for it. I sunk 4.2k into it now. It has and STi turbo and Intercooler in it, and runs at stage two with any other stage two STi years 04-06. Its got a lot of work done to it, but I paid a ton less than I would have even for a stock STi.


Remember, this is all my opinion and I am definetly not the top subaru guru around here, just happened to catch this post early.
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Old 09-16-2007, 10:18 AM   #6
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www.cars101.com is a good place to start

the sti & wrx use the same short block but different heads, giving the wrx slightly lower CR

07 sti has a revised 4th gear which lets you get up to ~117mph while the 06 sti only gets up to ~107mph. at the power levels you're thinking about, with the 06/07 wrx you're going to need a PPG box which will run you at least $5k, while the sti tranny will be able to hold that kind of power but for how long i don't know

i'd mention the difference in turbos and tmic but with your target numbers it doesn't really matter. you'll need injectors, intake, maybe tgv deletes, fuel pump(s), turbo, ewg, maybe water/meth injection, etc etc etc

Last edited by nhat; 09-16-2007 at 10:24 AM.
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Old 09-16-2007, 10:19 AM   #7
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Welcome to nasioc.
wise choice, unlike the earlier Imprezas, the 06-07's are search enabled.
04-05's are badly limited in their search functions,
and the venerable Bugeyes have no search feature at all.

start your research here:
http://www.cars101.com/impreza.html
specifically, here
http://www.cars101.com/subaru/impreza/wrxsti2006.html
and here
http://www.cars101.com/subaru/impreza/wrxsti2007.html

there are also maybe 50 threads on this site covering the same topic with everyone voicing their opinion.

edit - nhat cuts to the chase while I wasted a minute being clever.
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Old 09-16-2007, 12:42 PM   #8
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Engine - Similar engine different heads. STI has a larger turbo, larger TMIC and different injectors. Plus some other stuff....

Transmission - WRX has what some consider a weak transmission while the STI has a near bullet proof 6 speed with DCCD control to aid in handling.

Suspension - Different between the two, STI's is a rougher ride but handles better

Pro / Con - STI has summer tires that SUCK in the snow awesome on a dry street. WRX's tires just suck all around. The WRX is a lot less expensive. The STI is superior in everything else other then MPG...

TMIC vs FMIC. Its not a good idea to put a FMIC on either car with the stock turbo. Its just too small of a turbo and doesnt warrant cooling for a FMIC. You'll gain a little HP and a lot of lag that will make the car slower in real life....
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Old 09-16-2007, 01:21 PM   #9
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Regardless of what car you choose, with a 500 WHP goal, your going to want to build up the internals. Your car won't last very long on stock internals at that power level.

The WRX tranny will never be able to hold that amount of power. Period

Other than that....the cars are pretty much similar. It doesn't really matter what has a bigger turbo ...considering that your going to rip it all out anyway.

Buying a WRX will save you 8-10 grand easy over the STI.

Spend 5 grand on PPG's ...and the rest on power, and youll have a 500WHP car for near the same price a stock STI would cost.
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Old 09-16-2007, 03:08 PM   #10
xspeedracerx
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Question

thanks every one for all of the good adivce and knowledge. The unfortunite thing is im still stuck on my choice so i guess ill just have to think a bit more about it. question though irace559 you said get a wrx and speend 5 grand on PPG's, what is that?
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Old 09-16-2007, 03:32 PM   #11
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Have you ever been in a 400 hp STi? Because everyone wants a 500 hp STi. Its not practical and you will look at building a new block. I only have a STG 2 STi and well ive driven a 500hp, 1700 lbs sandrail and my car is a beast. But eventually you'll want more and a gt30r turbo will get you there and meth or race gas. Personally 500 hp is stupid.


just my $0.02
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Old 09-16-2007, 04:56 PM   #12
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Quote:
Originally Posted by iRace559 View Post
Spend 5 grand on PPG's ...and the rest on power, and youll have a 500WHP car for near the same price a stock STI would cost.
lol you think $8-10k will get you 500whp AND a PPG tranny?

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Old 09-17-2007, 09:00 AM   #13
xspeedracerx
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Quote:
Originally Posted by Imfasterthanyourevo View Post
Have you ever been in a 400 hp STi? Because everyone wants a 500 hp STi. Its not practical and you will look at building a new block. I only have a STG 2 STi and well ive driven a 500hp, 1700 lbs sandrail and my car is a beast. But eventually you'll want more and a gt30r turbo will get you there and meth or race gas. Personally 500 hp is stupid.


just my $0.02
Your 2 cents is noted, but not needed this is not opinions blog, i simply asked for info. to say 500hp is stupid to me is narrow minded. I have been in faster cars believe me. Anyways someone educate me on the ppg's tranny please.
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Old 09-17-2007, 11:12 AM   #14
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Quote:
Originally Posted by xspeedracerx View Post
Anyways someone educate me on the ppg's tranny please.
www.gearboxtech.com
http://www.ppgearbox.com.au/index-html.htm
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Old 09-17-2007, 11:21 AM   #15
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Default Dear NASIOC,

Dear NASIOC,

I an new to scoobys, so I want an answer to EVERY question EVER posted on the site, broken-down in to one, simple response.

Nevermind the fact that NASIOC's servers are constantly on the edge of "too busy," or that my post will just be another in the endless sea of, "Which is a better choice, and why?" threads. I am gonna' post it anyway.

Please wait at least 24 hours prior to locking this thread, as I am a glutton for punishment, and I have a brand new (Dupont) flame suit on.

Sincerely,

Uber Newbie

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Old 09-17-2007, 11:22 AM   #16
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Quote:
Originally Posted by xspeedracerx View Post
thanks every one for all of the good adivce and knowledge. The unfortunite thing is im still stuck on my choice so i guess ill just have to think a bit more about it. question though irace559 you said get a wrx and speend 5 grand on PPG's, what is that?
PPG's are a gearbox, very expensive, they run around 5k and that doesnt include install, althouth they are pretty much indistructable, best gears you can buy for this car by far
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Old 09-17-2007, 11:27 AM   #17
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PPGs are just transmission components, not actual gearboxes. gear sets, forks, lsds, etc
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Old 09-17-2007, 01:33 PM   #18
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Quote:
Originally Posted by xspeedracerx View Post
I am looking to build a streetable 500 whp and torque car.
Then buy a Corvette. 500whp out of a 2.5l flat four is not what is referred to as streetable.
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Old 09-17-2007, 01:35 PM   #19
xspeedracerx
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where can i look to find some more good info on the ppg gears?
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Old 09-17-2007, 04:23 PM   #20
xspeedracerx
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Quote:
Originally Posted by aaronmsadler View Post
Then buy a Corvette. 500whp out of a 2.5l flat four is not what is referred to as streetable.
again didnt ask your opinion on if it was reasonable and a 500whp wrx or sti is streetable! only asked for info on car.
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Old 09-17-2007, 04:43 PM   #21
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Quote:
Originally Posted by aaronmsadler View Post
Then buy a Corvette. 500whp out of a 2.5l flat four is not what is referred to as streetable.
500whp in any car isn't exactly streetable...
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