Power

[Jamie Bellamy]

Hello, I have a Subaru wrx prodrive 2004 , I have installed an sti intercooler, sti turbo, performance radiator, stage two clutch and fly wheel and a full de cat exhaust system including headers . I am going to get it remapped soon along with installing a fuel pump (aem 320lph high flow fuel pump)

I was just wondering what sort of power I would achieve 

[Tidgy]

varys from car to car, i;d expect somewhere around 280ish as the turbo will be maxed.

[Jamie Bellamy]

Is that wheel horse power ?

I also have the prodrive so it already has an update ecu , what difference would that make on the remap ?

[Tidgy]

whp is an americamism and not used over here. 280 will be at the flywheel though factor in about 25% loss (varies depending on alot of factors), so roughly 210 at the wheels

[Jamie Bellamy]

What upgrades do you need to do to get it to 300 hp?

as I have the full 3 inch exhaust system along with the headers and the sti power parts more or less

[Sandals]

Assuming the STI turbo is a TD05 should get more than 300?

[Jamie Bellamy]

Thank you , I was thinking that too , I was a little disappointed with 280 ish hp.

how much power do you think ? as I’m not sure if the stock wrx injectors would support it 

[Tidgy]

ah sorry, missed the turbo swap, will be a vf35 i expect so should see 320 ish assuming it has the fuel, may need a fuel pressure reg and 3 port boost sol to get the best form it

[Jamie Bellamy]

Ok thank you, having this power would I need to upgrade the injectors or just the fuel regulator?

also: I was also considering a cobb inlet , would that be any good?

 

 

[Tidgy]

should be ok with FPR, but no way to tell till its tried.

inlet pipe wont be a limiting factor so no need

[Jamie Bellamy]

Ok thank you . Do you have to get the fuel regulator 😂 or can I survive on stock ?

[Tidgy]

will find out when its maped, its one of those that some cars are ok, some dont. might be able to find some sti injectors that will do the job

[Jamie Bellamy]

The company that do the remap should know the limits , so hopefully they don’t mess it up . What’s the consequences for a lower fuel pressure or the injectors not good enough?

[Tidgy]

whos mapping it?

 

really bad as engine will lean out, but decent mapper will see it and stop the run. At that point its a choice between getting what you can and backing off the map, or swappng parts

[Jamie Bellamy]

oh not good then 

I can’t think of the name but im paying around £450

Would I be ok if I get injectors and have an upgraded fuel pump or would I still need the fuel regulator ?

If so what regulator or injectors would you recommend as I’m a bit tight on budget

 

[Tidgy]

uh, you dont know whos mapping it? is it on a dyno?

 

injectors or fpr should do it. i cant remember what brand mine are tbh

[Tidgy]

looking back at my emails mine are decapped and flow matched standard hawk sti ones, bear in mind its  very different application though as they are good for 500+

[Jamie Bellamy]

Its Being mapped on a rolling road and I think it’s going on the dyno.

oh, so the sti injectors should be good enough then , so I won’t need a fpr?

[Tidgy]

yeah for that power level the sti's should be fine, need to make sure they are flow match and tested before use though if they are second hand

[Jamie Bellamy]

https://sprintingharejdm.co.uk/Subaru-Parts/Fuel-System/16611AA510-Used-STi-Topfeed-Injectors-550cc

They are cleaned , flow tested and matched 

are these ok ?

[Tidgy]

just confirm with them they are the right fitment

[Jamie Bellamy]

Ok. Would these be good to just fit if they was the correct fitment, or would I have to get them fitted by a machanic ?

[Tidgy]

will need mapping as soon as they are fit as the fueling will be waaay too much. but they will do the job

[Jamie Bellamy]

Ok thank you , Is that the same for the fuel pump ?

Also would the remap people fit them ?

[Tidgy]

depends if its a garage or just a dyno place with a mobile mapper.