Originally Posted by jazzyjembreaze

^
400 or below
Ported oem headers 2 bolt Harvey tric up - pipe
Is whats required on a 2.5 sti running a standard VF 43
I achieved 387 bhp & 420 ftlbs on ecutek
Mapped by Bob Rawle

Above 400
You want tubular headers & 3 bolt Harvey tric up -pipe
Turbo choice is yours to choose
Sc46 or MD321V billet is my choice

Originally Posted by chopperman

Was that with a de-cat?

Originally Posted by jazzyjembreaze

Yes , although a little mis- leading I was merely adding what can be archived from a VF43 on a well built engine
Yes full decat

Originally Posted by chopperman

There used to be a saying when people said uninformed things, "you watch too much tv". I think the modern version is "you read to many internet opinions"

Many always say the 2.5 is made of chocolate ect but they have never owned or driven one. Their comments come from things they have read from anonymous forum posters. You can tell because they just come out with off the cuff comments rather than informed fact and detail.
There are two types of 2.5 impreza engine, the ej255 wrx and the sti ej257. The wrx is not known for many problems and i believe 350bhp is fine but it does have the weaker 5 speed box.
The early sti 2.5 2006 had the earlier head gasket which was revised in the 2007 engines. the 2008 on had ringland issues which prompted subaru to revise the map which seemed to solve the problem on standard cars.
The ppp map to 316 bhp was said to be 10% below the engines limit on standard internals. There are many 2.5 cars that have achieved high trouble free mileage but like most cars if you read forums there will be reports of failures. Personally i would not go above 360bhp unless you have forged pistons and 11mm head studs as a minimum.
Internet forums are much like the press in general. You only read horror storys.

Originally Posted by jazzyjembreaze

^
Many facts
& it's quite a technical answer / basically it's down to
Size , diam , flow rate , spool , pressure etc etc
Do an Internet search on tubular gains & disadvantage

Originally Posted by Flaps

That's the most sensible post i've read on here in a LONG time!

Originally Posted by veerinder9

I think I know why im gtting abit lag than I expected, think its my tubular headers :|, I knew I should have just gone for ported oem...

Originally Posted by chopperman

Are you still using the Top mount intercooler or have you gone front mount? I believe on some set ups a front mount while giving potential for high bhp can also cause more lag that the tmic.

Originally Posted by veerinder9

Im on top mount, ive watched my gauge and the boost reads at 0 psi at 3k rpm, gets to 20ish psi not sure what rpm cz im too busy looking on the road lol

Originally Posted by chopperman

With boost it's more the maner in which you rev rather than the rev if that makes any sense. You can drive at like 130mph off boost if you just let the engine slowly pull it. Im probably making full boost by about 3500rpm if im pressing on.

Originally Posted by jazzyjembreaze

I take it you did a search for the explainative from gains to disadvantage

Originally Posted by veerinder9

Yes I did , ported oem would have been better as tubular header diam are larger and flow rate is slower, but im thinking if I stick with the headers n uppipe and go for the sc38 which will work better with the tubular headers as its a 380 turbo, and go fmic
I will be changing short motor to a 2.0 forged closed deck block..

Originally Posted by veerinder9

Ohh! I get what you mean, il have to someone to watch them for me wgile I boot it, better way as I dont really floor it to the metal while watching them.. Scary.. Lol

Originally Posted by Jolly Green Monster

But it will be laggier which is what you were trying to get away from.

Originally Posted by chopperman

I know exactly what you mean. Try live mapping. "right, now hold 1 bar,,, now floor it" watching the guage while holding a level of boost and keeping an eye on the traffic. scares me every time

Originally Posted by veerinder9

Wouldnt the sc38 spool up quicker though?

Originally Posted by Jolly Green Monster

no... its a larger turbo, and even with billet wheel I wouldnt expect it to spool sooner than the td05 16g you have on there especially with a fmic to fill.

for the spec you have its a rapid car.. I thihk you just need to alter your driving style.

Simon

Originally Posted by legacy_gtb

----

Originally Posted by Jolly Green Monster

2.5?
What was the failure?

Originally Posted by chopperman

Yeah, i think a sport cat can deduct about 10-20 bhp from that figure. I remember Bob Rawle telling me you can get about 390 odd on v-power with a vf43. I only got 362 @1.6 bar but i am running a sport cat and my engine had only done about 1000 miles since the build. I think my figure will come up once it has a few more thousand miles on it as i made 359 before the forged build at 1.4 bar. Not too bothered to be honest as i find it a very quick road car. My next step will be something like an sc42 and map to about 420 bhp. I think that will be perfect in a newage as a road car.

Originally Posted by Jolly Green Monster

Ouch!