powercrazed

as title, what is the max power these injectors could give me? im after 430ish bhp. will these do or would they struggle?

nathan

tweenierob

IMHO that is just over poss power... 4bar atmos fuel pressure should do it but will put a lot of strain on the fuel system (pumps/reg etc)

Rob

powercrazed

im running phase 1 inlet manifold so its either 550cc or 850cc if im correct? any options other than phase 2 rails and 640cc?

nathan

tweenierob

Lots of options tbh...

depends on what you want to spend, for a budget option i would use 850's

For the next in line i see Andy F has some 740's and adapters for £430 in scoobyshop

IIRC the scoobymania Phase 1 direct fit injectors i fitted for someone were about £400 ish, as it goes maybe £450...

Rob

powercrazed

cheers rob.

just looked in scoobyshop and found injectors+adaptors for £450. looks like the best option.

nathan

dowser

If you already have the 550's, just raise fuel pressure to 4 bar.

Richard

Tim W

iTrader: (1)

Nathan, with a bit of tweeking phase 2 rails will fit an early phase 1 manifold (ie pre MY97/8 phase 1.5) and then you can buy phase 2 injectors...740cc from an Nissan S14 SR20DET engine cost me 360 quid all in IIRC

powercrazed

how much tweaking we talkin?where did u get the injectors?

nathan

scooby-si

419bhp, but with an ajustable fuel reg you can run them at 110% and you might get 430

coulty

or 440bhp as Andy F had in his old RA.

Tim W

iTrader: (1)

A tiny amount IIRC, speak to masters Wallis or Pavlo it was they who told me about it a while back. I think, but could be wrong, that you just need to fit the left hand phase 2 rail on the RHS of the phase 1 manifold and vice versa.

Speak to Dan from SRB Power he normally keeps them in stock, mention my name, I've bought a few sets from him for various mates.

Incidentaly with the S14 SR20DET injectors you need to modify the connectors to get the standard Impreza sockets to fit (it can be done and has been discussed on 22b), or get the injector loom off an S14 200SX for the correct sockets.

scooby-si

my 430 was a good guesstimate

tweenierob

He may have been running 4x 550's but there was more than 4...

Rob

PICKLE

I had to change to 740'S @around 360bhp!! Was @ 100% IDC on 3.4bar FPR on my 550's

I know all cars are different etc, but I think you would be pushing the limits of the Pump/inj's trying to get 400bhp+ from 4X550's IMHO Not to say it can't be done mind, just that I'd rather have the security/piece of mind of not running everything at max!!

(as Rob says, Andy had 5 i reckon )

madou

Amazing ! I though c. 360 bhp was 4 x 380cc injectors @ 4 bar atmo ! LOL

powercrazed

im runnin 341bhp at the moment on stock 380cc but am just about to fit a turbo with a 440bhp maximum. should i stick with 550cc and max them right out or be safe and get the 740cc and run lower fuel pressure?

nathan

PICKLE

I would personally go for the 740's straight away. Will save you having to buy again when you want to go further (in future, you're bound to )
Higher initial cost maybe, but once fitted, you can forget about them til at least 450-500bhp levels IMHO. 550's would only be a stop gap, such as happened to me.
Also the pump will tire running at higher fuel pressures after time too (mine did that too!)

AndyF is doing a good deal on Tomei 740's