im looking for more power in my hawk sti..currently its around 350/375..

I would like around 420-450 bhp.
its on the standard turbo which I believe to be a vf43??? and I think the max power of these is around 360-370??

I assume I have an open deck block?? so whats the max these can take?? ive read around 450-480bhp??

so what do I need to get to what I want??

this is what I think I need..

new injectors?
front mount intercooler
turbo.. something like a sc42? sc46 to much lag?

would these be enough??

maybe exhaust manifold?? but I would want to keep it un-equal..?

obviously mapping!

anything else??

car in question is...

hawk STI 2.5
sports cat
3inch cat back exhaust
deatchwerks fuel pump

and yes before anyone has any snidy comments... its fully forged

oh and price?? 3-4k??

mm

 

My 2 litre made 450ish on a top mount using a sc46, japspeed exhaust, gt headers, 800cc injectors, fpr and a walbro in tank fuel pump controlled via a simtek ecu. So add it the bits your using plus a fmic I'd think for cool runnings in hot weather as I did eventually. Depending how well your forge is the sc46 can do 500 with a dash of meth from my experience

 

SC42 billet
Injectors,
fmic,
remap
Air Filter,
Clutch which can support the torque
assuming you have brembos then you can upgrade to some better discs and pads
that should easily get to the power level you are after.

You may also want to think about some handling mods aswel. keep in mind you want to get the smallest turbo possible to the amount of power you want. This will help keep cost low and also mean you can achieve faster spool. You could get SC46 again depends on your goal.

 

Could do approx 450 with that budget mate - I'm going MD321t along with pretty similar changes apart from 1 or 2 other tweaks.

Much more options for you than me with Hawk compared to my Hatch with regards intercooler so a nice we purchase from USA from me.

Presume you've upgraded clutch or plan to as I'm sure standard will start to toil when you hit 400.

Yes your standard turbo will start to max around 375-385.

 

missed the forged info

 

Firstly ,mickey
What did your build consist in the way of ( fully forged )
Because the bible has many chapters
Any block work ?
Was the oil pump uprated ?
Stud conversion etc etc
List your full spec
It's better to start at the top , thus eliminating requirements for a reliable day/day car with decent figures

 

forged pistons
forged rods
rcm uprated oil pump
acl bearings
rcm head gaskets
arp headstuds



organic clutch was fitted.
ive also had coilovers and front and rear ARB with ALK.

thank you all

 

i wld go with the sc42 for road car

 

If your content with the 385 - 400 mark & want to keep cost to a minimum
I pushed 393 out of a vf43 that was running inner wing induction FMIC
OEM headers ported by Harvey with matching 2 bolt up- pipe
Full de- cat , fly wheel & stage 1 clutch etc etc
/ that was maxing everything in the list beside the FMIC
Not all VF 43's will give & some rare instances they have hit 400
If 400 & above is your goal - it depends on how much more your goal is ?
If it isn't higher than 20-40 BHP then go with what P1 says
But you will need headers & a 3 bolt up -pipe
Injectors etc etc

 

My hawk sti made 401hp/439lbs on the standard vf43.

That was with twin scroll headers, twin to single scroll up pipe, rotated vf43 with custom downpipe and short ram k&n

 

Would it no be best to over engineer and aim for say 440hp and run at 400.than maxing out everything
Where things are stressed and more likely to fail.
This is what I'll be doing with my 2.5 build.

 

what im trying to do is up the power with minimum cost.. yes yes.. I know that's what everyone is trying to do.

ive always tried to change/replace the weakest or most restrictive parts..

so I assume that my block is open?? and they `should` be ok at 450bhp??

and injectors, sc42 and front mount should see me get that with ease??

obviously with hindsight I should have at least got the block pinned...


this is what im trying to do..well sort!!sort of aim for 450.. but expect around 420..thats why I opted for a 3inch exhaust and not 2.5.

 

what other mods do you have??

are you forged?

 

Imagine a 2.5 with a SC42 BILLET TWIN-SCROLL
This is what I would love to do to my UK hawk STi when I upgrade my turbo!! Obviously it will need new headers, downpipe to make it fit for a twin scroll to, but I reckon it would spool nice and drive brilliant on the road, which is whats more important to me!!!

 

The downpipe is a decat, uprated plugs, fuel pump, fuelab fpr and ecutek map.

It's running the standard short block, going for forged build soon for piece of mind. The car ran 372/409 for 15 months, 388/410 for a few months and 401/439 for 4 months so far.

 

My WR1 is putting out 450bhp 497ft lb on a SC46. 2.5 forged.

 

SCD mickey
Yes , block may run into diff if you push the bar as liners are thin
Spk with Alyn ( AS Performance for a solution
But .... At the 460/500 mark the EJ257 needs £ for reliable power
Hell it's subaru's nemisis

 

You're not asking for too much if the engine is properly built.
A SC46 will do the job, although watch this space as we've been working on a T36 sized turbo with great potential and a relatively low price.
I have a newly forged 2.5 Hawk parked at home, I'm running it in right now with one on, and so far it feels just fabulous giving easy boost from 2500 rpm.
We know it'll run 450 bhp having seen that from a 2.1. We use wrapped RCM headers.




A better intercooler is pretty much essential for the sort of charge temps seen around those power levels. Grimmspeed do a top mount that looks like an option, or just go for a front mount. You don't have to spend a fortune, just have it fitted well.
Injectors and a map will complete, and within your budget.
We'd complete in two days if you're keen!

 

This is what matters to me Thats like instant boost(well close), you can keep your big GT30/35''s that make 550-650bhp and take ages to make boost, my perfect set-up is something that spools up quick and pulls hard to the redline, very interested to hear the outcome of this new turbo, cant wait to hear/read about it!!

 

I'll post up as soon as we've mapped it. It's running a top mount which will limit the outcome of course, but we'll certainly see the characteristics.

 

SC46+ is the way to go turbo.

Not seen one yet that can spool anywhere near as well for that sort of power target

 

What sort of rpm we looking at full boost???

 

Have a look in the billet turbo thread, the graphs up there (on phone so can't link at min).

 

Agree, it's a very good turbo, we've fitted plenty and have never been disappointed. We never stop looking at new stuff though!

 

My cat does that too!

 

thank you

im just having idle thoughts at the minute and just trying to figure out what I could need should I choose to go ahead..

im liking the sound of the new turbo..!! will deffo keep an eye out over the coming weeks

was also concerned that the block would be give up at those levels

of course im keen!!!
but like most things in life.. its all about the monies..

look forward to hearing more about your new turbo, sounds like a nice option.

ill drop you a mail in the coming weeks/months detailing exactly what I have and the options open to me.

thanks for your help youve put my mind at ease regarding power/block.

 

I've got one of Alan's forged 2.5 motors. It's a right piece of kit mate. Get involved!

Joe

 

Hi Dan

Good to see you are finally up and running again after HG issues

If on a budget then stay with the oem top mount and drop in turbo and injectors.
Keep it simple and enjoy.
The rest of the car is sorted by the looks of it.

Choose the turbo with a big wastegate penny as the 2.5 can surge with a restricted wastegate.

The faster the spool the easier it is to drive quick on the road.

 

o stuff always move on and long may it , the + is the what, 20th revision of it? although not all of those ever go beyond test stage

Back on comp

Was 420ftlb at 3700rpm hahaha



full boost (although kept down due to car spec)

 

sc46 at 460hp gives a hell of a bite and tbh is the most you really need on the road trust me