driftobezurko

hello i am new here, just recently bought myself an 03 wrx wagon and was wondering what the quickest way of acheiving 400+hp?
thanks

smokingkills

iTrader: (3)

There isn't a quick way & it isn't cheap.

Your shopping list will include:
Headers & up pipe, de-cat, 3" exhaust system, injectors, fmic, air filter, remap or ecu upgrade & remap, turbo eg md321h, gearbox, clutch, forged pistons. Probably the best part of £8k there & thats before you ugrade other minor details like brakes & suspension.

The rookie

iTrader: (1)

Fuel cut defender and enough boost to destroy the engine and turbo in short order?

Seriously, for 400bhp....
Larger turbo (Garret GT series/MD321)
FMIC, although the STi TMIC is just about capable
Ported manifolds (or tubular)
255lph fuel pump
Full decat/sportscat exhaust inc up-pipe
Larger injectors
Full remap

Realistically your bottom end is only OK to about 350bhp with a sensible life, so for 400 you'll also need a forged (or STi) bottom end.

Simon

loony toon

iTrader: (4)

sti top mount
uprated full pump
fuel pressure reg
td05 18g
full 3 inch decat system
sti pink injectors
headers
induction kit
and a remap by andy forrest !!!!


will get you 360-380 bhp

but you will need a new clutch too !!



You can hit 400bhp but your piston will go chocolate and your need a rebuild




Once my car is mapped ill let you know what figures i get



Tony

driftobezurko

thats great lads thanks, what is everybodys view on the tubular manifold vs ported one? whats the pros and cons for both
thanks

trevsjwood

iTrader: (2)

ported and polished 5-10bhp
Good qual tubular 15-20bhp with quicker spool up,more responsive car.
Need for ceramic coating tho,costs £350

cookstar

iTrader: (6)

Is that right, I was told these give more top end power, and ported were best for spool.

stevebt

iTrader: (8)

cookie your right ported for spool and aftermarket for better power

driftobezurko

hmm tubular me thinks, i may aswell get the manifold along with decats and full s/s and a nice big tubby

Henrik

iTrader: (5)

remember that a big turbo comes with late spool, especially on a 2-litre.

My td05-20g with tubular headers spools quite late (1 bar at 2900 rpm in fifth, with full boost at 3400), but in lower gears it's not quite that good at all (spool wise). I'm happy with my set-up, but low down grunt is lacking, which is a bit of a pain when pootling about.

cookstar

iTrader: (6)

Thats why i was put off of tubular with my MD321T on a 2.0, its bad enough with ported.

Turbotits

iTrader: (2)

I think the opposite. Mine spools much better with more torque lower down the rev range and more top end power on tubular (td05/18) I did have harveys ported before these.

New_scooby_04

iTrader: (4)

Better off selling the WRX and getting an STi if you want 400, to be honest.

If you'd settle for 340ish (which makes for a very quick car) then look at my plus profile to get an idea of the mods you'd need, you could settle for the STi8 intercooler rather than the front mount though, you'd also need a decat up-pipe for your MY car I believe.

After that, it starts to get expensive!

Ns04

DB07P1

yep u wud deffo need to look at an sti bottom end first i wouldnt want to take a wrx 1 past 320bhp tbh

driftobezurko

yep i am starting to look down the sti route, or could just settle for 340 ish

Tidgy

depends how far your gonna go.

befor eyou start going looking at sti's have a think, if your gonna go 400, uprated suspension, uprated brakes etc etc

then even if you get an sti you'll end up doing them anyway, but you'll be buying and selling a car meaning you loose money for no improvment

Bartop

Buy mine

300bhp/ton

Not that I'm wanting to cause havok but an rpm range isn't spool that's boost threshold.

Spool is getting the turbo up to speed after a stall period. More commonly called lag. You can experience this even at high rpms such as 6000+rpm's, well within the boost threshold. Example be at WOT (any gear) at about 5000-6000rpms, lift off the gas all the way then go back to WOT before the engine rpms drop more than 500rpm or so.

There'll be a momentary lag before the exhaust gas flow velocity and the turbo impellar are spinning fast enough to produce boost. This is the spool period or lag.

Henrik

iTrader: (5)

whatever it's called it's not that great low down

trails

iTrader: (41)

subaru didn't make sti 03 wagons. the prats; they would have sold loads.

I have an 18g on my classic wagon (with a standard UK bottom end), and Henrik is right it does spool up later than the OEM TD04 but its only an issue if you can't use your gearbox It also alows you to cruise at 85\90 without rolling on and off boost.

RB5Caterham

I agree with Tidgy, if the answer to getting more power, response etc was to buy a better car then what would happen to forums like this.

We all know 400 is achievable on standard internals and that its leads to a ticking bomb in regards to the engine, gearbox etc, etc.

Hey, some people like ticking bombs!

New_scooby_04

iTrader: (4)

Oh the irony: an owner of a big engined, naturally aspirated yank tank has just given a very nice account of the difference between boost threshold and lag!

300bhp/ton

But thats only cos I'm a petrol head and also bleed diesel

I love Scooby's , driven a few in the past and almost bought one on at least 3 or 4 occasions in the past. Also had a 200SX turbo and various other turbocharged machines.

JimmyBFC

Qucikesy way........buy an sti, better base to build off, for less than half the money needed to convert a WRX, thats for sure.

dunx

iTrader: (3)

My advice is try 320 bhp it's not to be sneezed at !

Then transfer all your bits onto a 2.3 bottom end later for even more fun.... like blowing your clutch and gearbox to bits !

LOL

DunxC

driftobezurko

lol sounds fun lads, i suppose al just have to try things out, i think i will settle for 350ish, whats the stock turbo good for? and do the pink sti injectors max out at 350hp?
all this help is greatly appreciated thanks

h4rry

iTrader: (3)

View my scoob mate, spent around 5 months shopping around and pciking things up cheep as and when they become available then paid around £3500 to have it all out together inc some additional bits purchased by the tuner.

Def would consider starting with an STi though. I went for an Axis Racing stage 2 block from america and had no choice but to start with a wrx as i blew mine up, lol heheh

Henrik

iTrader: (5)

stock turbo good for about 290bhp at a push.

STI pinks will flow enough for roughly 370bhp at standard fuel pressure, but with a fuel pressure regulator 400'ish is achievable.

On the other hand, a decent FPR will set you back almost 200 notes, so it might be cheaper to buy bigger injectors to begin with.

Mocom Racing

iTrader: (2)

These graphs are of my 2.0ltr STi running a 7cm FPGreen.
Red lines - Ported OE headers @1.5bar held to red line
Blue lines - GTSPEC headers on the same map as when running ported OE headers - boost had now dropped off at the redline
Yellow lines - GTSPEC headers mapped tweaked to hold 1.5bar

All testing conducted on the same test track under the same conditions at North Weald

cookstar

iTrader: (6)

Great comparison there, so how much are they then?