What to change to get closer to 400bhp?

The hatch WRX is booked in with Bob again the end of the month, Andy K will fit a SC40 for me first, I am also thinking of gutting the TGV's , but what else?

Aren't you pushing your gearbox at that as torque will be similar

Yes mate when it goes it goes, I will either 6 speed it or go for the helical synchro kit.

Anyway, induction kit, injectors (don't know what's on yours) 3" Decat exhaus, intercooler (poss, not sure what yours is capable of as standard)

Would of been cheaper buying a STI in the first place if your thinking of 6speed. But then again qe always swap and chamge stuff and then work oit how much its come to and you think FOOKING HELLLLLLL.

Current spec its running is forged pistons, VF 43, cosworth induction kit and perrin intake pipe, 3" decat downpipe with 3"nur spec cat back, 3 port boost solenoid, standard headers ported, FMIC, I believe the injectors are now the same in STI and WRX, but not sure what they are capable of?

Marshffs wrote:

Would of been cheaper buying a STI in the first place if your thinking of 6speed. But then again qe always swap and chamge stuff and then work oit how much its come to and you think FOOKING HELLLLLLL.

I know mate but I am in to deep now.
I was thinking of cutting my losses and selling up for a classic type R, but I will lose to much on the hatch.

Marshffs We're the fun in that :-)

more fun making your scooby to what you want step by step

I ran pink in mine and were near max on 381

Hawkeye blue are bigger and will see 400

Tgv mate

Up pipe for faster spool ? Harvey smith

Fuel pump the

Seem you there on spec

I think the injectors are 565s ?

Sorry forgot its already got a HRC fuel pump in, I think Andy ported the up pipe slightly to match the headers. Do the up pipes make that much difference? I would of thought as long as they are not catted then they are ok?

Ive got some deletes here

Them injectors will see 400

Don't think they are the same mate, the injectors sit different.

Looks like all you need now is a turbo and 6 speed. Why only an SC 40 if you've forged? SC46 is supposed to be a great turbo for the 2.5

The SC 40 is cheap!
And the engine is only built for 400 mate, standard parts apart from the pistons.

Think you'll need to go fully De-cat if your wanting 400 as the cats are too restrictive once you get upto that sort of power.

It is fully de-catted mate, 3" downpipe and a blitz cat back but it has a resonator in the centre section and a massive back box so its pretty quiet, I hope it is not restricting it too much?
I am thinking of going to a straight through centre section and single exit back box instead of the quads I have at the minute.

Well Bob Rawle told me that the Nur Specs were poor for getting good power when I changed mine.

atwrx wrote:

Well Bob Rawle told me that the Nur Specs were poor for getting good power when I changed mine.

I think the hatch system is a lot different to the older systems, but you could right?

Its currently running 350 and 385 with this exhaust.

This is the spec jonny had the car I have now built to. Thats running just under 400bhp and about 410lbft.
Killer B sump baffle plate
2.0 sump conversion
HRC 340lph Fuel pump
Toyosport exhaust system.
TD05 20g billet turbocharger
Ported TGV deletes
Hawkeye STI inlet manifold
Hawkeye STI intercooler and Y pipe
K&N typhoon short ram induction kit
3 port boost solenoid
Air pump removed
Genuine HKS SSQV blow off valve
Throttle body coolant delete
Header tank insulators
ported headers and up pipe
NGK ILFR7H spark plugs

This is on a hawkeye wrx with a similar forged job to yours. So probably pretty close to what you're after.

chrisw wrote:

This is the spec jonny had the car I have now built to. Thats running just under 400bhp and about 410lbft.
Killer B sump baffle plate
2.0 sump conversion
HRC 340lph Fuel pump
Toyosport exhaust system.
TD05 20g billet turbocharger
Ported TGV deletes
Hawkeye STI inlet manifold
Hawkeye STI intercooler and Y pipe
K&N typhoon short ram induction kit
3 port boost solenoid
Air pump removed
Genuine HKS SSQV blow off valve
Throttle body coolant delete
Header tank insulators
ported headers and up pipe
NGK ILFR7H spark plugs


This is on a hawkeye wrx with a similar forged job to yours. So probably pretty close to what you're after.

Nice list!
Most of them are ticked off but I might keep my eye open for a inlet manifold.

One mod which I would definitely recommend is the gear linkage bush kit from as performance. It's only £60 and massively improves the feel of the gear change on the 5 speed. Makes the box feel much tighter and the changes more precise.