|10-17-2013, 03:05 AM||#1|
Join Date: Aug 2013
Location: Vancouver, BCVehicle:
Engine Modifications for my 2005 Subaru STI: Any Suggestions?
Good evening folks. I currently have a 2005 Subaru STI that I am looking at taking to the next level with a few possible modifications.
As it sits my car is running an AP Stage 2 tune.
It's got a Turbo XS FMIC, Cobb TBE, Injen Intake and an HKS BOV. For reference the car has a brand new engine and brand new clutch; all OEM.
In regards to go-fast goodies I have been thinking about getting some DW 740CC injectors and a protune. Also considering a set of Grimmspeed PnP Headers; are they worth it?
To start with...will my stock VF39 handle a protune, 740CC injectors and possibly PnP headers or will I have to upgrade to a GT2871R or the likes? Another question is the reliability of my clutch. With a protune, 740cc injectors, etc; I would guestimate low 300whp numbers. Would my stock clutch be able to hold up?
If all goes through I will also be investing in a 255lph fuel pump for a preventative mod for the added fuel.
Ideally I just want a little more pep but to keep "stock-like" reliability.
Are there any other "light" modifications you guys can educate me on? I don't want to go crazy and start breaking ****, been there done that; it gets old.
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|10-17-2013, 03:33 AM||#2|
Join Date: Jun 2008
Location: frederick, mdVehicle:
6speed/ 330whp/ 300wtq
Take a trip to the proven power bragging section. Read the stickies in the newb section. Clutches are rated for torque not horsepower. You should also check the parts review forum. Find a tuner local to you and ask them the best route.
|10-17-2013, 02:46 PM||#3|
Join Date: Feb 2006
2006 OBP WRX Wagon
You have a lot of good mods right now such as that FMIC and the TBE that can handle the stock turbo easily. To get more out, you will definitely need those injectors or larger for future purposes and definitely an upgraded fuel pump.
Care to explain why a brand new clutch and engine but just stock?? I would've upgraded the pistons and the clutch to handle more.
|10-17-2013, 04:00 PM||#4|
Join Date: Sep 2002
Location: Boulder, COVehicle:
2008 Forester XT 5mt
Assuming you wish to go past stage 2, then I'd offer the following suggestions for a
2005 Sti and 91octane fuel (i believe that is what Vancouver BC has for premium)
Injectors / Fuel pump
Upgrade to Walbro 255 LPH. You can spend more and go with a larger pump, but for the power you wish to push it will not be necessary.
The current injectors should be running close to 90-95% duty cycle with the stock turbo at sea level. The new injectors will give an added bump in fuel delivery and 650 or 740 would both work. For reference, we've had excellent experiences with the deatschwerk side feeds. Ultimately, the size will be dictated by the power output and turbo size. For low 300 WHP you will be fine with 650cc, but most people figure it's worth spending a few more bucks to get the 740 option in the event the power goal grows in the future. I.E. Buy injectors once, not twice. With that said, the 740cc would be the winner.
GS PnP header
They will give power gains assuming the X-pipe is used with them.
GT2871 = skip this turbo and go to the Blouch 18G xt-r. It will have more "pep" than the vf39, especially on the top end. A 20G will definitely exceed the power goal and may strain the engine's reliability since it has stock internals.
Once the parts are selected, then you'll need to install and take care of tuning. Most tuners will also offer a Start Up map, assuming the car needs to be driven to the tuner after installing the parts. If you are unable to find a shop that offers this service then let me know since we offer it through our E-Tuning services.
Alternative research area:
Proven Power and Bragging forum as Bother EddieJ. mentions.