Yeah the tiny vf-39 and the vf-43 which are the same except for the wastegate are simply to small to flow enough air at the higher rpms. We have to taper to 14-15 psi by redline. throw a sligtly larger turbo on and you will no longer have this problem and thats why its so much easier to make the Evo alot faster fo less $. That is why I love the Evo and want to get one to park next to my STi. Oh by the way your Evo is sick i saw the videos on IWSTI

 

Sinister Subaru don't take what I say personal, seriously being on this website has made me skeptical of all things. I am not saying that this car hasn't made good power, I just would like further proof before people such as the thread starter start to make in my opinion bogus claims. I have seen other dynos of 07 STI Limited and they haven't seemed much different than 06 STI dynos. It could very well be that the 07 STI does make more power, but to make such claims off of a few dynos from one shop in my opinion is jumping the gun. Dynos are great tools, but like all tools they can be potentially manupilated. Through out the forums I see EVO owners doubting everything, but when I come to other cars, this skeptism seems lacking, and I just wonder why?

For example, what if ONE shop got a chance to tune a 07 EVO IX SE. With simple Bolt Ons such as TBE, MBC, Intake, and Tune it put down 380whp/380wtq. First off I can guarrantee EVO owners would be highly skeptical of such a number, rightfully so, it is way above normal. We would plead for more info and further proof of this cars potential power. The owner in an attempt to prove his EVOs power takes his car to the strip and runs a 12.5@111mph. His excuse "I only got one run". Everybody here knows that such an excuse would not hold up, and the skeptics would tear that EVO and it's so called power number to pieces. We would not only call BS on that EVO, but would DEMAND further evidence from different shops, and DEMAND 1/4 mile times to back up these numbers. I know all of this, because this is exactly what happend with the EVO IX when it first came, fortunately the EVO IX proved its case.

Enter this STI, very similiar, ONE shop making numbers that thus far are way above normal, it runs a 12.7@109mph with the excuse "I only got one run". Sorry just like how I would be skeptical of an EVO, that excuse does not hold up. Not saying it is not possible for 07 STI to make such power, but NOTHING IS SET IN STONE AND YOUR CASE HAS NOT BEEN PROVEN. Thus this is a stupid thread.

 

^^ very well said. I know the 07's have some changes but until i need to see some good #'s at the track to back it up. I do however think The 07's will be able to get into the 11's with the stock turbo since all the other years are so close.

 

I also agree with you on this. I believe they will finally be able to slip into the 11's with the stock turbo. You have to remember the stock Evo 9 turbo is quite a bit bigger than the VF34/39 and 43.

BTW I will be buying a 9 here pretty soon .

 

Very true, the Stock STi turbo is maxed out around 22psi and cant hold much more than 15psi to redline. Also it falls flat on its face above the 6k region.

The evo ix is just a beast, plain and simple. For $/hp the EVO is obviously a better choice, but its better to acknowledge this than make excuses for why one car is "better" than the other. Either way, the STi and EVO are both amazing cars for the money and it comes down to opinion in the end.

 

I dont see anyone saying the EVO is so superior, but why does Subaru keep changing thier engine? this has been the case now for the past 3 years.. I couldnt own a subaru just on the fact that they cant leave anything alone.. I would hate to own a car and EVERY year they make it they change its body/engine alot.. I like subaru but they cant leave anything the way it is.

 

Yeah i started this thread to make bogus claims. Jesus Christ i just noticed a thread on nasioc where they were making big power on the 07s, it seemed like they had made some differences to the engine and so i figured maybe this board would want to know/discuss it. I wasn't making outlandish claims about anything.

 

You forgot you're on a EVO website, and since psychology is an integral part of car selection for a lot of people, even suggesting that something else is comparable or even better is taken as a personal insult. Ever see the Volkswagon ad which shows the guy in the performance car yelling out his window with a bullhorn " I'm making up for my inadequacies"? It's not far from the truth. People always seem to think the car makes the man. Not quite. LOL!

 

Also, dont get into to the HIGH hp evo vs subaru comparison, there is none. There are maybe 2-3 fast sti's in the nation, where as on the evo side there are many many more shops campaining some very fast 800+whp cars.


Scorke

 

It is still the same engine EJ257. So they put more efficent heads on it, big deal. The engine remained exactly the same from 2004-2006 no changes at all.

And you are telling me that the 4g63 platform has never chaged one bit over the last 15 years? The Evo is always changing body styles, turbochargers, engine revisions, etc. How is a car suppose to get better if you never try anything new?

 

This thread is great

Glad to see that STi's are making decent power with boltons, its about time.

Topspeeed gives great tunes and I'm sure this was a safe tune, hasve any Stis gotten into the 11's with the stock snail?

 

Well... the first part is very believeable, the after the tune is some how questionable.

Based on my observations, my friend made 239whp/229tq on a stock STI 04 then he added a 3"TB, CAI and a Cobb access port tuned then he put 268whp/299tq.

He gained a total of roughly 30whp and 60tq on a mustang dyno. Since the 04 and 07 STI are roughly rated at 300hp that would more less give you an idea of where the STI's are standing.

The numbers sound to me a little bit optimistic. The mods whp and tq improvements sound about right, but the final tuning whp and tq numbers a little high to me.
Carlos

 

But after the day is over and he parks it in the garage, it is still a Subaru.

 

I have a Cobb AP Stage 1 ECU tune and I just dynoed last week. 243hp and 272 lb/ft tq at the wheels. This was on a dynojet at Mach V. According to Dan at Mach V, my #s were pretty low, and that on that particular dyno STis were dynoing at around 240-250 hp stock, and 250 lb/ft tq. I asked him what stock Evos were dynoing on that particular dyno, and he told me 225 hp and about the same with torque for the Evo VIII. It just sounds like a low-reading Dynojet to me. From what I hear, STis with nothing more than a tune and a downpipe will pick up nearly 30-35 whp. I'll comment on that after I get my downpipe. The biggest problem with the STi/STI isn't the small turbo, but the downpipe, which is very restrictive. Give the EJ257 some breathing room, and you can make some very good numbers.

 

SinisterSubaru,

Let me piggyback a bit on one of your comments. Not everyone on this forum knows the exhaust configuration of the Subaru WRX/STI.

Relatively Subarus have a tendency to gain more power and torque when adding a downpipe when compare to the Evo. Let me explain, the 03 to 05 WRXand STI came with 2 catalytic converters on the Downpipe, the Evo has none on the downpipe, instead the Evo has a single cat after the Downpipe, in my opinion it is well back to be affected by spool up and velocity of gases.

As you know very well, the Subarus extract very significant amount of power and torque from the downpipe due to the elimination of two consecutives cats located inches from the turbo.

Additionally there is no longer a third cat (up-pipe) on the 06' and up Subarus. This would logically explain why the downpipes make the Subarus gain significantly in performance. Basicly what I am saying is that a 07 Subaru model will pick up huge tq and power from a Downpipe alone.

Carlos