Hi all, my aim for this summer is to get to 380bhp. I currently have a 2007 STI which has the following mods:

FORGED PISTONS
PERFORMANCE PANEL FILTER
DECAT PIPE (on standard STI exhaust)
WALBRO FUEL PUMP
REMAPPED TO 330bhp
Ideally I would like to keep my standard airbox as i like to keep it quite quiet . Please can you advise what other mods I need to do to get 380bhp? Someone has said that I can simply add a bigger turbo like the lateral performance 321t and then remap again and I should get 380bhp. I just wanted to get some other views on this please, if you think I will need other mods then please can you advise what ones? Once again thank you all in advanced !

 

sc42 or sc46 + map, not sure what injectors are fitted as standard to STI's tbh

 

565 I believe a 20g would achieve 380 no problem

Airbox is good for 400

Just slap in the 20g you'll be fine

Steve

 

Made 380 on my standard hawk sti turbo so no need to swap it

 

Why 380 firstly ? As you can get away keeping a few things , but on the flip side will be close to maxing out ( not necessary a good thing ...
My advise would be acumilate all the parts for a bigger spec & have a engine wich will work well within its tolerance ..

If 380 as a max figure you require
Your VF43 will suffice as will your 550 blues ( just about .
Your goin to need ported OEM Headers , up pipe ( 2 bolt
Or go RCM with up pipe ( 3 bolt
Your 2 port sol is good for a bit more but change it out for a 3 for better control
Map sensor I would up
Down pipe full decat or sport cat 3" tailing down is fine
You will need a clutch if your still on your OEM
Exedy pink box etc etc
That all is goin to cost you a bit
As I said I would personally build it beyond that
Turbo
Injectors
Fueling
Intake

Regards

 

Can i ask what mods you had to get 380bhp on your hawkeye? also is it uk version?

 

Thanks for the info, i thought 380bhp would be good as i thought that i dont have to change so many things in the engine to get to that figure. I dont plan on taking it on a track just maybe the odd 1/4 mile run maybe once a year, but its mainly for the street so it wont be running maxed out that often..Anyway thanks for the advise appreciate it mate.

 

If you start changing for a bigger turbo like the MD321 or SC46 etc you will need to start looking at having the engine forged, and your looking at £1000+ for just the turbo!!

A 3"inch turbo back exhaust system would be a good start, maybe porting & polishing the standard headers and upipe and getting it remapped again, should see you not far off 380bhp, just dont be to hung up on a exact numbers, as its how the car drives that really matters!!

Maybe if you was looking at doing something to your turbo then have you thought about putting a billet compressor wheel in your standard VF43??? A lot cheaper then paying out for one of the expensive turbo's and should spool up quicker and make a bit more power!!!
http://www.xsboostturbochargers.com/...f39-vf43-vf48/

 

Thank you for your advise, do you know where I can get my headers and up pipe, ported and polished? Or can you recommend a good set of new headers, up pipe, and 3 inch exhaust? I don't really want the car to be to loud, and are all after market 3 inch exhausts "free flowing" ?

 

Have the head gaskets got uprated head studs?

Seems strange that it has pistons alone.

 

Hi yes I forgot about that, it's also got uprated ARP bolts

 

Same here

 

Same here as well.

 

Oh I see please can you advise your exact mods you had to make 380bhp? Also please can you advise who done the remap? I got mine remapped by duncan at race dynamix

 

Oh I see please can you advise your exact mods you had to make 380bhp? Also please can you advise who done the remap? I got mine remapped by duncan at race dynamix

 

I'm running 396 on the original 43, but slightly ported, so the turbo is good for the sort of power you want but mine is modified to get it up that high.. hyperflow front mount, 3" De cat. Miltelk system, hyperflow air intake relocation to inner wing, 1 bar forge actuator, walbro fuel pump.
But running standard injectors and engine in a 07 plate Sti type UK.
Mapped by Bob rawle

 

Should be okay for 380 but you could probably push to 400-odd. I guess it depends on whether or not you care if it goes boom, if you don't then go for what you can.

To go much above your target you'd ideally want forged connecting rods and uprated bearings, depending on use.

Big limiter with 2.5 blocks is the block itself as they don't do well at high boost.

 

Fully forged engine with the usual secondary air valve delete, tgv's etc.

Still on standard turbo, inj and intercooler

340ltr hr Torques fuel pump

Full 3" exhaust

And mapped by Bob Rawle

 

Ok thanks for the info, so if I get my headers and up pipe ported , and get a 3 inch decat turbo back exhaust instead of my standard 2.5 Inch decat exhaust and then another remap by duncan at race dynamix then do you think my car will go from 330 bhp to around 380bhp?

 

Not strictly correct..... it's about the cylinder pressure, which is not just boost related on it's own, but about the amount of air that's being consumed. This would be totally different if it was a VF43 or say a GT3076 at the same boost pressures.

 

Thanks for the info, everyone who gets their car mapped by Bob rawle seems to get really high power figures, I might have to visit him after I have got my 3 inch exhaust fitted and got my headers ported, please can you advise where he is based ? Does he have a website where I can contact him ect?

 

Oh right, so do you still have standard headers?

 

Yes standard headers that have been ported along with a Harvey Smith upppipe to help with the spool, which really does work

 

Ok thats great please can you advise where i can get my headers ported? also do you think i could get 380bhp with a fully decat 2.5 standard sti exhaust also walbro 255 fuel pump?

 

Full 3" decat , 3bolt headers , tgv deletes , RCM fuel pump, air pump delete , also mapped by bob rawle standard turbo vf43, 380bhp

 

Bobs based in Swindon. He does all my mapping for my Hawk Sti.
Search brdevelopments.

 

Ok thanks for the info but please can you advise what you mean when you say tgv and air pump deletes? As I have not heard of this before

 

There is a secondery air pump system that connects into the heads ,,, this can be deleted with two blanking plates and removed (needs mapping to remove fault code aswell),,, you can make the plates yourself if needed as I did

The tgv's are the two bits that sit under your inlet manifold that your injectors are connected into ,, they have butterfly valve inside and you can replace them with ones without the butterfly valves inside (tgv deletes ) ,, also needs mapping to remove the codes

These are both for emissions I belive

 

Ok thanks for the info I know my car has had the egr valve removed, is that something different ?

 

I would ask Paul Finch (finchmotorsport) to see if he can help you with your car, he can't be more than 10 minutes from you (07790877519) He helped Butty with his Hawk STI when he had an HG issue, then running 380hp on a 20g with standard engine and would point you in the right direction.
Trev