[MikeyB]

I would like to know (roughly) what power my car could be running once fitted with the following, it’s a 2003 WRX with 3” de-cat straight through exhaust (currently producing 264 BHP and similar torque)

STI 8 Bottom End (2.0L)
VF34 Turbo
Uprated Injectors (700cc+?)
Uprated Fuel Pump
EcuTEK Remap
STI Cams, P1 Head, STI Valves
Decat Up-pipe
Exedie single plate race clutch, complete with flywheel
New K&N panel filter

Cheers all!

Neilo

330/340 ish....you only need sti injectors to achieve it though, dont go too big.

[MikeyB]

What do I need to hit 380? Or isn't it as simple as that?

juggers

iTrader: (1)

A jap spec sti

why waste your money moding a wrx you mite aswell just sell the wrx and buy a jap sti

[MikeyB]

The bottom end, crank and rods are kaput on the car at the moment, just to get it back on the road is 2.5K, then there's all the hassle of selling, transfering private plates etc, and probably only get 10k for it, then can only afford another 3k to buy a newer car, and an sti is only running 280bhp with resonable mileage....

but then again!!! THIS IS MY DILEMA...

Neilo

to hit 380 youd need a larger turbo.....thats about it in addition to that spec.

oh and better inductionwould help it along.

[MikeyB]

So should I stick a TD05 18g (or 20g) on then as they only cost couple hundred quid more?

Neilo

18g "may" get there but its unlikley, the 20g should get there.

swifty.....!

iTrader: (4)

talk to andy.f he did his 03 wrx project car to 378bhp can't remember total mods but was a tdo5 18g http://andyforrestperformance.co.uk/index2.html

WRX_Rich

iTrader: (5)

i wouldn't bother with changing the heads \ cams unless you are going to fit a bigger turbo ( or plan in future )

my 02 wrx made 386 bhp on a roger clark turbo on std internals running 1.4 ish boost
simular spec P1's seem to make 400 + bhp running 1.5 bar boost with the same turbo

[MikeyB]

Rich, do you mean a bigger turbo than the TD05 20g?

WRX_Rich

iTrader: (5)

all i can say is I have over 380 bhp on std wrx heads and cams,

have a chat to RCM, API, Zen and scooby clinic and compare prices etc they will not try and cheat you and be more than happy to explain

one day soon i will be in the same position as you and this will be my first step

Neilo

Yes, IIRC it is a GT35 with a P18 exhaust housing, so the turbine wheel is significantly larger than that of a 20g. However the exhaust housing is not which is why it doesnt make a rediculous amount more power than a 20g.

I have a similar thing with my GT30, although my housing is larger than the P18. Hence capable of potentially more peak power, despite having a slightly smaller wheel than a GT35...but much bigger than the 20g (44lb/min for a 20g vs 55lb/min for my GT30)

Hope that makes sense.....

Im with rich on the dont bother changing cams/heads for this level though.

WRX_Rich

iTrader: (5)

Neil I think Mikey ment do i think heads need replacing on a vf34 or 20g

but for the record my turbo is a gt35 p18 from RCM.... l doubt it is a garret 35wheel in there may be a 30, i don't think you could hybrid a 35 wheel with a p18... why they call it that i don't know

Mikey something you have missed off your list if your wanting to get close to 400 is a Front mount intercooler

Neilo

ahh my bad

[MikeyB]

Cheers Rich, the bill is close to 6K already so I'll have to wait on for the FMIC... cheers anyway!

Neilo

but if you ditched the heads then you could I dont think its worth upgrading those at this level again, as Rich has said, he gets 386 with standard UK heads, and im aiming to get around 420 with the exact same UK heads too....so if you chopped that cost off, how much would it then be?

[MikeyB]

£500 for the heads, my advice were the heads were crap on the standard UK Wrx?

Neilo

they arent "as" good as STI ones (not quite as agressive cam timing) but they arent crap either with the right mapping....

[MikeyB]

Would you get them or not? Should I put the money into a FMIC?

WRX_Rich

iTrader: (5)

ok sounds fair enough

after being in a jdm 2 litre sti with a higher rev limmit i do see the advantages of replacing the heads but u may want to ask the question in the technical section

Neilo

you can of course run the UK heads up to 7500 with no problems as far as im aware too....

Althoguh STI5 heads for 500 quid does sound quite a good deal!