What do you think of it? Max boost at 14.5

http://www.media.subaru.com/

 

Interesting!

1.Perhaps it comes with crappy turbos?

2. Maybe this thing will be a monster at 18psi if it holds together.

Those are my thought anyways

 

Remember it's ONLY a 2.5l which gives it half a liter on the Evo. (I realized after posting that didn't look as sarcastic as it was supposed to...just read that with a touch of sarcasm to it, ok people? ) Depending upon the quality and size of the turbo and strength of the internals though...that could make for some fun tuning.

 

If 14.5 is enough to get 300/300 it's good. I wonder if it'll hold 16-17 with no big deal? And what would be the result.

 

I believe it will be running a VF-34. I think it is very similar to the VF-30 but with ball bearings. Click for pic http://www.fastwrx.com/ihivftur.html . The people that are running it seem to be happy with it. That's not that many though since it is relatively expensive compared to the VF-30, 23, 22. I have not seen compressor maps for it. It is suppose to be very strong to 22 psi. With the forged internals (crank-rods-pistons) I'm hoping it will hold reliably at 17-18 psi. The question is will the new (new to this continent) six hold the power or will it break my heart and make me cry like a little girl.

 

Dude,

VF30 and 34 cannot hold 22psi to redline. For that matter, I think it can only only 16 or 17psi to redline. I might be wrong but definitely not 22psi.

You should actually hope for a VF22. VF 30 and 34s are probably only good for max 380hp whereas a VF22 will easily push past 400Hp. But, because, it is a large turbo, it is very laggy on a wrx and hence not very desirable. It could be great on a 2.5L though.

With VF34s, your STi could run out of breath easily. In fact, I would actually say that an evo twin scroll might be better for top end. Just my thoughts. But you are right regarding ball bearing turbos, VF34 is the current one availble on production subies for MY02.

Ha, the anticipation........ the worries....man, life was this good with imports only in the early 90s.

Nick

 

I didn't wanna assume it used the same (more or less) turbo as the WRX cuz I've heard much problems of people trying to maintain high boost (over 17psi) constantly on them. Kinda stinks imo, but I'm sure the STi will be plenty hot regardless.

EDIT: Oh, btw moving to other cars since this has nothing to do with Evos.

 

nicktckho,

If you go to http://www.turboxs.com and click on “Click Here for WRX Performance Parts”. Then click on TXS UTEC Stage 4. You will see a VF-30 next to the stock turbo for 2001 to 2003. The VF-34 should be identical in size to the VF-30. Further down on that page there is a dyno chart that shows 273 whp. They claim that they are getting an additional 105 whp at 17 psi out of the current WRX 2.0 L engine. You are correct about the VF-22 being a stronger turbo and that the 2.5 L engine will benefit from it. I may be wrong about people using the VF-34 for 22 psi. I have no first hand knowledge of it, just what I have read here on the www. The information is only as accurate as what is posted.

 

Does that mean the STi is running at 14.5 psi or the trubo's max boost is 14.5?

If the STi is only running 14.5psi, i wonder how many horses @19psi. Anything over 20psi .

 

This same site that this info source for the 14.5 came from also states that the wrx max turbo is 13.5 we all know people are running 17 plus on wrx's so I would assume from the factory it will go MUCH higher. And as far as the strength, this motor is built. It will hold as much if not more than we can throw at it. They reinforced the hell out of it. I think 300 whp is pretty easily doable with just a few tweaks. That with out even opening up the exhaust.

 

The 14.5 (STi) and 13.5 (WRX) psi numbers are maximum boost on the stock boost curves, not the maximum boost the turbo is capable of.

Latest speculation is that the STi may have a new IHI turbo, but pictures of the show cars show the same housing (F55) as the IHI VF30 and 34. It won't be long until we find out exactly what turbo it has.

Still, with only 14.5 psi max boost, semi-closed deck, forged internals, AVCS, 8.2:1 compression, and 2.5l, there is going to be a lot of tuning potential.

TRS

 

You make a ood point. Everyone one on here speculates about the new sti engine being weak, Or built to the max already. I can tell you with 14.5 boost and real forged internals that include the pistons. (the evo has cast pistons) This bad boy is far from being at it's max. I will imagine stock for stock that in the end it will produce more than the mits engine. Simply cause of displacement and the strength of the internals.