[zax]

Well its sounding like its not a good idea to try and increase the power in the STI. I love the car and the idea of having performance and AWD. But it may be sounding like it wont be enough performance. I get mixed signals because theres so many different opinions on this subject. Even when you look up opinions from tuners and builders advice like Crawford out in California and other reputable places they talk like the weakest link and problem really isn't the EJ motor at all. They say the real issue and cause of failer in these engines is people buying online tunes or taking it to a tuner that really isn't good at tuning these cars. And when that happens the EJ motor does not run right because it either runs lean or has knock and other issues which cause the rings to fail. According to them if its done right and the ECU is tuned right it will last as long as a stock engine!

I 100% agree with your assessment.

The biggest challenge is indeed improper modifications and bad tuning practices... particularly by tuners that are unfamiliar with the EJ platform.

That being said, your post is asking what it will take to maintain reliability while increasing the power output by 75%. That's a tall order. I truly believe that the issues with the EJ257 are generally over-hyped... a product of a very vocal community and the prevalence of a metric crapton of performance parts (having a platform around for 25 years tends to do that). Even still, there are limits and increasing the output 75% will most certainly reduce reliability.

If you want power and AWD, the Evo platform really is the superior choice.

 

[TheZman]

With that said from what ive heard the Evo has the stronger engine to mod but the Subaru STI has the stonger trans and drivetrain. So if thats the case its kinda like pick your poison. Do you want to have to build the engine more on the STI and have a strong drivetrain or have weak drive drivetrain on the Evo but it has a strong engine!?!? Either car you would have to build something up.

 

[TheZman]

Theres an article in Super Street Magazine online called The truth behind the Subaru EJ series engines- Tech Knowledge. Its a good read. Very reputable Subaru builders weight in on the EJ engine! Its a good read. Look it up..

 

[zax]

With that said from what ive heard the Evo has the stronger engine to mod but the Subaru STI has the stonger trans and drivetrain. So if thats the case its kinda like pick your poison. Do you want to have to build the engine more on the STI and have a strong drivetrain or have weak drive drivetrain on the Evo but it has a strong engine!?!? Either car you would have to build something up.

Yes, I agree. It is a "Pick your poison" situation if you are shooting for more than 1000whp.

For "medium builds," the Evo is far cheaper to modify. The transmission itself is not the weakpoint, but the transfer case and AYC will need reinforcement over ~600wtq. The boxer motor will always be more expensive to build up compared to an inline-4.

Theres an article in Super Street Magazine online called The truth behind the Subaru EJ series engines- Tech Knowledge. Its a good read. Very reputable Subaru builders weight in on the EJ engine! Its a good read. Look it up..

I know, I've read it. I've been an active community member for roughly a decade.

 

[TheZman]

Sounds like its going to be a pain in the a$$ to get the power i like to have in a car out of the STI..

 

[zax]

I know you are very focused on power. May I ask why?

Weight is just as important and the Challenger you currently own is roughly 25% heavier.

 

[TheZman]

Not necessarily. Im mean i want more power but its not important to have as much as my Challenger because i know the STI is lighter. I just know i wont be satisfied with the 305 crank hp stock on the STI. I just thought or hopped that i could increase the power and it would be easier then it really is seeming to be. I just like fast cars. Id love to have a fast AWD car. Especially for the winter. If i could afford a Nissan GT-R i would buy one.

 

[TheZman]

It would be nice if there was a good way to drop 400lbs of weight off the car without ripping seats out and stuff! That would improve it without jacking up the warranty.

 

[irickchad]

It would be nice if there was a good way to drop 400lbs of weight off the car without ripping seats out and stuff! That would improve it without jacking up the warranty.

if you want to increase the power in this car you should be NOWHERE near the word WARRANTY, and I feel like I answered this for you before, but it could've been someone else... to get a "RELIABLE" as in "holding 400whp" engine, it'll run you from 12-16K. Reliability is very subjective, however, and that engine may only hold 400whp for 10,000 miles.

 

[zax]

You should consider a B8 Audi S4

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[TheJ]

You should consider a B8 Audi S4

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Larger displacement and 2 more cylinders than the STi do seem like it would make for a solid choice. Not only are the peak numbers from the factory higher than the STi but I would imagine the power band overall would compare more favorably. I don't know Audis well but I would imagine that starting with a larger engine would make it easier to make greater power, relatively reliably.

Plus it has a MUCH nicer interior. It is more comfortable and more practical for a family. It is a sweet car.

 

[zax]

Plus it's available in 6MT or DSG

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[TheZman]

I dont know im not a big audi fan. I like the Rally racing heritage of the STI and what its capable of. I have a WR blue one on hold with $500 down. Its supposed to be in on September 30. I just saw a used white one for sale and stopped just to look at it. I really like them i think the new STI s are really nice!!

 

[zax]

Just an FYR.

The STI is nowhere close to a rally car. The "heritage" to which you speak is nothing more than a superficial resemblance to the body shape. This is simple marketing at best.

If you really wanted to throw "Rally heritage" into the mix, Audi has had a far more effective rally campaign over the years compared to Subaru.

Not to sound brash, but I've said it before... if you like the STI, by all means: buy one! I've been very happy with mine. But you are asking for a lot of mutually exclusive things here...

"I want 400whp, can the STI take it?" - The Evo or S4 are better platforms
"I don't like those other cars because [insert superficial reason]"

You have to let go of something here.... either that the STI is an effective drag platform or that somehow Subaru's campaign in Rally (which ended over a decade ago) is meaningful in any way other than as a marketing tool.

ADDENDUM: I'd also be much more pleased with my STI if Subaru offered the EJ207 here in the states. The EJ257 is just so.... meh.

 

[Muranyi]

Im thinking about buying a new 2017 STI. Id really like it to make more power but would not want to have to worry about something going wrong since the warranty will obviously be compromised. So if i wanted 400 wheel horsepower or more whats the best safest route and how much would it cost? I know all the basic parts evolved when tuning these cars for more power. But i want reliable power. So aside from all the bolt ons like down pipe, upgraded fuel pump, exhaust, injectors, blah blah blah ect ect... For reliable would it be necessary for forged pistons and a closed deck block? Or would the pistons be good enough? And what would the typical cost be for 400hp? I know for 300hp to the wheels stage 2 its about $2900..

Closed deck is not necessary for this power. A semi closed deck is what I would recommend. Though if you're going to do that you may as well go closed deck. Who knows you may want more powerrrrr later on?

That's not to say just doing the pistons etc won't do the job. But you would definitely upgrade the internal for that reliability.


Stay tuned.

 

[rican1986]

If you want 400whp, here:

ID1000 Injectors
Walbro 255lph pump
GTX3572R rotated manifold turbo
ETS FMIC
EWG
Killer-B ELH + rotated EWG UP (does this exist yet?)
E85 flex-fuel kit
Tuning solution (obviously)
TGV deletes
Parallel fuel rail mod
IAG fuel damper kit
IAG AOS
Snow performance Water/Meth injection (you'll need all the det-resistance you can get)
Catless DP
Speed-density conversion
Killer-B Oil pan, baffles, and pickup (you'll need the extra oil capacity for cooler oil temps)

That should make 400whp on most dynos. The motor may last 100,000 miles or 1,000 miles. At these BMEPs, the motor could go at any minute.

Sure, you could build the motor for another $8,000-10,000 and it MIGHT last another 50k miles, but built motors rarely last as long as stock OEM motors.

At the end of the day, you might have an Impreza that cost you $65,000 and resells for $25,000. Or you could have a $40,000 Camaro SS (with 400+whp mind you) that resells for $38,000.

very nice into have a 2011 wrx its stock and quick but learning quick just how much money it cost crazy. dam srt-4 neon 1600 buck bolt on 50trim 500hp untune lol. subaru cant even put on intake on without a tune lol.

 

[Dip set]

You will spend far less money making the Evo fast. End of story.

I don't understand you.

First you want a car that is fast enough to run mid 12s in the quarter. When I explain to you that there are far better cars than the STI for drag racing, you get defensive. Now you're asking about 400whp which will put you into the 11s if tuned on some dynos. If you like the STI, why not just buy it instead of asking all these damn questions?

If you truly are torn, please consider listening to the logic here.

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Seriously, learn from me as I have sti now and spend well over 6-7000$ just to get 400 whp and working on flat 4 is so much harder as for evo spark plugs is right there for you to change, injectors are on top right there for.you to change while sti is all on the side of engine, I hear evo only need to spend about 2-3000$ to make that kinda power and their block can hold up 500-600 and 400-450 is max for sti block, if I could I wish I could of started build with evo first

 

[SD_GR]

Have you ever wondered where all the Lancers went? Where are they lately?

 

[XJman]

Northern Kentucky. They are all over the roads around here.

 

[zax]

Have you ever wondered where all the Lancers went? Where are they lately?

I always assumed "into concrete retaining walls" -- the same fate as all of the SRT-4s.