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Old 02-16-2016, 12:17 AM   #1
Subaru wrx 847
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Default i want about 350 whp need help plz

Ok guys sorry if this post is annoying o maybe you guys have seen this before but i own a 2007 subaru wrx tr current mods is a
- k&n cold air intake -
-invidia One-Piece Equal Length Header & Uppipe
-Invidia Downpipe Catted DivorcedWastegate
-Invidia g200 cutback exhaust
And its tuned by Boosting performance
But now i want to upgrade my turbo intercooler fuel pump injectors and run e85 and want to make roughly 350 whp for now. What turbo intercooler fuel pump and injectors do you guys recommend for me.
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Old 02-16-2016, 08:49 AM   #2
REX_WGN
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This is best answered by your tuner, with more educated questions from reviewing these threads. My tuner and shop gave me the best advice.
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Old 02-16-2016, 09:01 AM   #3
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I wouldn't push a wrx that far (It's going to blow up) unless your willing to drop some serious cash, and in that case just sell your car and get an STi where you could safely tune for more power.
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Old 02-16-2016, 09:29 AM   #4
MIKE DD
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Quote:
Originally Posted by kenliu84 View Post
This is best answered by your tuner, with more educated questions from reviewing these threads. My tuner and shop gave me the best advice.
Quote:
Originally Posted by StrawHatSTi View Post
I wouldn't push a wrx that far (It's going to blow up) unless your willing to drop some serious cash, and in that case just sell your car and get an STi where you could safely tune for more power.
These are most of the answers you are going get, and rightfully so.

Why do you want 350hp? How did you come up w/that number? Are you just trying to get as much HP as possible just because, or do you plan on tracking the car?
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Old 02-16-2016, 11:56 AM   #5
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Quote:
Originally Posted by Subaru wrx 847 View Post
. What turbo intercooler fuel pump and injectors do you guys recommend for me.
Any name brand IC is fine
Deutsche Works makes good fuel pumps
Injector Dynamics makes good injectors (look for at least 1000cc)
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Old 02-16-2016, 12:01 PM   #6
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Originally Posted by StrawHatSTi View Post
I wouldn't push a wrx that far (It's going to blow up) unless your willing to drop some serious cash, and in that case just sell your car and get an STi where you could safely tune for more power.
Why do you say you can tune an Sti for more power than a Wrx? They are the same blocks essentially with both weak points being mainly the Pistons... Unless you're speaking about blowing up the transmission
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Old 02-16-2016, 12:52 PM   #7
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I recommend you spend the money on some writing classes so you can communicate what you are feeling more effectively. It will help your employment outlook greatly and then you can buy a GTR or something!
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Old 02-16-2016, 01:27 PM   #8
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Originally Posted by jpham91 View Post
Why do you say you can tune an Sti for more power than a Wrx? They are the same blocks essentially with both weak points being mainly the Pistons... Unless you're speaking about blowing up the transmission
essentially the same block isn't the same

And the weak part is the pistons????
Piston pretty much never fail outside of basically gross negligence
It doesn't count as failing when some bozo tunes a motor so aggressively that it sees massive detonation long term and eventually blows the rings out
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Old 02-16-2016, 02:23 PM   #9
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*cough cough* driveline weaknesses *cough cough*
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Old 02-16-2016, 02:50 PM   #10
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Quote:
Originally Posted by rtv900 View Post
essentially the same block isn't the same

And the weak part is the pistons????
Piston pretty much never fail outside of basically gross negligence
It doesn't count as failing when some bozo tunes a motor so aggressively that it sees massive detonation long term and eventually blows the rings out
This.
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Old 02-16-2016, 06:16 PM   #11
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Quote:
Originally Posted by Subaru wrx 847 View Post
Ok guys sorry if this post is annoying o maybe you guys have seen this before but i own a 2007 subaru wrx tr current mods is a
- k&n cold air intake -
-invidia One-Piece Equal Length Header & Uppipe
-Invidia Downpipe Catted DivorcedWastegate
-Invidia g200 cutback exhaust
And its tuned by Boosting performance
But now i want to upgrade my turbo intercooler fuel pump injectors and run e85 and want to make roughly 350 whp for now. What turbo intercooler fuel pump and injectors do you guys recommend for me.
In addition to everything else that was said, just going by your thread title and lack of general respect for the written word, I'd say you should spend some significant time at 185HP and prove that you're worthy of such lofty power.

Or don't. Money and intelligence tend to be mutually exclusive around these parts. . .
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Old 02-16-2016, 06:24 PM   #12
Japereira88
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And if you really do want those mods, you should also be looking into EBCS, AOS, and some mounts, some suspension work for sure, ensure you drive your car the way it needs to be to protect that tranny... theres a lot that goes into man, basically like Tris is pointing out, really think about it and make sure youre ready for that power, both knowledge wise and driving wise.

And i mean, really do your research and know your ****. theres even stuff i still am learning AFTER my build has been completed, and with that, a few things i would have done differently. I love my build, but ill be the first to admit i rushed it a tiny bit and could have done myself better.

EDIT: Also ask yourself... when things start to go wrong, or break down, or lines start to leak and i have no idea where to look... are these things i can asses and fix if need be? am i going to have to take it to a shop everytime? thats an important question, dont just think about doing the build, think about the maintenance youre going to endure down the road as well.
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Old 02-16-2016, 07:56 PM   #13
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Get the Cobb flex fuel and be done with it.

Honestly don't think the current WRX trans will break due to excessive power. IF it breaks it will be due to operator error and abuse.
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Old 02-16-2016, 11:06 PM   #14
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Originally Posted by rtv900 View Post
essentially the same block isn't the same

And the weak part is the pistons????
Piston pretty much never fail outside of basically gross negligence
It doesn't count as failing when some bozo tunes a motor so aggressively that it sees massive detonation long term and eventually blows the rings out
Unnecessary heat is usually the culprit for detonation. Running lean = more heat. So yes, I consider cast aluminum pistons that are susceptible to heat weak... I'm guessing you don't?

So IMO I think a stock WRX block can handle 350whp on e85 pretty sufficiently as long as the op gets a good tune and monitors/logs frequently. But like stated talk to your tuner.
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Old 02-16-2016, 11:19 PM   #15
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Quote:
Originally Posted by Japereira88 View Post
This.
I'm confused, what is different? The blocks have the same part number. Depending on year, they can have the same crank and same rods. Some of the WRX's (as well as Legacy GT's, Forester XT's, and Outback XT's) have been found to have STi pistons installed by the factory when taken for a rebuild. My engine builder found that my Outback XT had STi pistons installed from factory when we broke it down for mileage rebuild for much larger turbo (mid 300's whp on dyno) at 190,000 miles. As a small manufacturer, Subaru has a history of using "whatever is laying around" in the factory when they send out vehicles to keep productiong moving.

In any case, what is the difference?

Last edited by dahoseman; 02-16-2016 at 11:25 PM.
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Old 02-17-2016, 08:39 AM   #16
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Stock pistons can't hold up to high horsepower - it has been documented pretty well here by both car owners and shops. Eventually, the pistons will give at this power level. Who mods their car to twice the horsepower and drives it around like grandma/grandpa? Unless you do that, then the pistons won't hold long.
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Old 02-17-2016, 08:56 AM   #17
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Quote:
Originally Posted by jpham91 View Post
Unnecessary heat is usually the culprit for detonation. Running lean = more heat. So yes, I consider cast aluminum pistons that are susceptible to heat weak... I'm guessing you don't?
ok, but running lean means somebody tuned it poorly and is asking for problems. Sure, will some materials hold up better under dangerous conditions? Of course.
All I meant is that it doesn't really count as a 'weak spot' when the motor is tuned so irresponsibly that it is simply running WAY out of any reasonable level to expect reliability.

That's like hitting it with 'just a little' nitrous and saying the crank is weak because it broke.
Even top fuel dragsters find 'weak' spots right? Usually somewhere around 6000 hp.
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Old 02-17-2016, 09:08 AM   #18
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High horsepower? Get an STI? Get a GTR??! :LOL: Geez the guy is only looking for 350whp and on E85. You could probably get pretty close to that using a factory STI turbo depending on dyno. I would go with a 20G, flex fuel and a reputable tuner.
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Old 02-17-2016, 10:03 AM   #19
jpham91
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Originally Posted by rtv900 View Post
ok, but running lean means somebody tuned it poorly and is asking for problems. Sure, will some materials hold up better under dangerous conditions? Of course.
All I meant is that it doesn't really count as a 'weak spot' when the motor is tuned so irresponsibly that it is simply running WAY out of any reasonable level to expect reliability.

That's like hitting it with 'just a little' nitrous and saying the crank is weak because it broke.
Even top fuel dragsters find 'weak' spots right? Usually somewhere around 6000 hp.

Running lean isn't always attributed by someones bad tune... There are factors that are out of the control of the "tune" such as bad gas, failing fuel pump, failing/clogged injector, elevation differences, hell the o-ring on your fuel filter could fail while going into boost (from experience), etc. Parts fail... It's the luck of the draw and have nothing to do with the "tune" but has a detrimental effect on it. The tune is only a piece of the pie try looking at the entire pie. My point is the chances of a cast piston surviving are very low compared to forged since they have better susceptibility to heat.
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Old 02-17-2016, 11:05 AM   #20
Japereira88
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Quote:
Originally Posted by dahoseman View Post
I'm confused, what is different? The blocks have the same part number. Depending on year, they can have the same crank and same rods. Some of the WRX's (as well as Legacy GT's, Forester XT's, and Outback XT's) have been found to have STi pistons installed by the factory when taken for a rebuild. My engine builder found that my Outback XT had STi pistons installed from factory when we broke it down for mileage rebuild for much larger turbo (mid 300's whp on dyno) at 190,000 miles. As a small manufacturer, Subaru has a history of using "whatever is laying around" in the factory when they send out vehicles to keep productiong moving.

In any case, what is the difference?

the differences really aren't anything crazy, which is why its so easy to say that essentially they are the same block, but when it comes down to it, there are the differences.

Pistons are slightly different, as well as crank. Also, side note, 08-14 STi's come with an oil cooler stock, however WRX's do not have an oil cooler what so ever. Small thing that helps a lot.

This article is a good read:

http://forums.nasioc.com/forums/show....php?t=1667168
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Old 02-17-2016, 11:23 AM   #21
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Originally Posted by Japereira88 View Post
the differences really aren't anything crazy, which is why its so easy to say that essentially they are the same block, but when it comes down to it, there are the differences.

Pistons are slightly different, as well as crank. Also, side note, 08-14 STi's come with an oil cooler stock, however WRX's do not have an oil cooler what so ever. Small thing that helps a lot.

This article is a good read:

http://forums.nasioc.com/forums/show....php?t=1667168
I'll leave this just for you: 21311AA071 .
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Old 02-17-2016, 11:27 AM   #22
Japereira88
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Quote:
Originally Posted by jpham91 View Post
I'll leave this just for you: 21311AA071 .
yes they make one, i was saying they do not come with them stock when you purchase a wrx.

also, if you scroll down this page

http://www.flatironstuning.com/p-199...l-coolers.aspx

you will see EJ255 08-14 is not listed, only STi.
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Old 02-17-2016, 11:34 AM   #23
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LMAO at this thread

<---- 100% stock longblock at 430awhp and drive it like the animal it is, including many [unsanctionedevents] from a dig against nitrous "street" cars. T60R at 26psi on pump 93 + meth with FFS and LC.

101,000 miles and still going strong. Thought it had been damaged a few times now but its always something petty: vac line, pcv trial and error, loose fuel connections, random loose connection, alcohol tank leaked and ran it empty (crazy lean), and now dead cooling fan relay.

Sleeved shortblock been in my garage for over a year expecting the stock pistons or headgaskets to pop.
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Old 02-17-2016, 11:50 AM   #24
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Quote:
Originally Posted by Japereira88 View Post
yes they make one, i was saying they do not come with them stock when you purchase a wrx.

also, if you scroll down this page

http://www.flatironstuning.com/p-199...l-coolers.aspx

you will see EJ255 08-14 is not listed, only STi.
06-07 Wrx are ej255 and have stock oil coolers... Since when did they not count as WRXs?

Edit: not trying to turn this thread to a poop show, just don't like misinformation in a thread that is regarding a 07 Wrx
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Old 02-17-2016, 11:59 AM   #25
Japereira88
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Quote:
Originally Posted by jpham91 View Post
06-07 Wrx are ej255 and have stock oil coolers... Since when did they not count as WRXs?

Edit: not trying to turn this thread to a poop show, just don't like misinformation in a thread that is regarding a 07 Wrx

they stopped putting the oil coolers in the EJ255 WRX after 07. Not trying to argue with you either but its not misinformation. I wasn't replying to the OP, i was replying to the person who asked what the differences were between the EJ255 and EJ257 in general.

Also why i put it in as a side note that it was for 08-14, not 07, and because its not technically a difference between the blocks, but something that someone can find useful if they have an 08-14 and are looking at blocks.

EDIT: also, my apologies to both you, and OP if i wasn't clear enough when specifying that i was only referring to the 08-14's. i had included that in the post, but reading it back, maybe it wasn't as clear as it should have been. Was just simply a side note.

Last edited by Japereira88; 02-17-2016 at 12:04 PM.
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