You asked what's necessary to go to 4bar (1st post), and if that alone would support 175whp on an SR20DE (2nd post), then stated that you wanted 200whp NA (3rd post).

Stock injectors will support 175whp as shown in post #1 of this thread.

It's not much of a stretch to figure out the equation needed to determine what they'll support at 4bar (203whp), however, to do that, you'll need to buy an adjustable fuel pressure regulator, and fuel pressure gauge (either way, you'll need an ecu retune). It would be more practical to buy a used set of 370cc injectors for ~$100.

I suggested starting a new thread because your 3rd post indicated you're looking to push such high whp NA. FYI - In all my time here, and it's been a long time, I don't recall anyone running a normally aspirated DE who needed to upgrade their stock injectors.

C

so the 370cc injectors would put me just over 200 (in theory), could i go to 444cc? and would either one require the ecu retune? thanks for the response

bigger injectors SUPPORT the higher HP levels, ALONE they will not give you the HP

Changing injectors or fuel pressure ALWAYS requires an ecu retune. 370's (and 333's from a VE) fit in a stock rail and any injector running 3bar will not require an adjustable fuel pressure regulator and for 99% of NA DE people, stock 259's @ 3bar are sufficient. 440's are top feed and need an aftermarket rail. Don't take this the wrong way, but unless you're planning on dumping major dollars into a DE, I doubt you're going to need any sort of injector upgrade. You're asking noob questions, and while that's not a bad thing, they've been addressed many time in other threads, and don't belong in this thread, which is more of a reference thread. The number of views vs posts (23,645 vs 143) bears this out.

C

sorry, point me in the right direction and i'll be glad to go there (new to the forum)

http://www.sr20forum.com/search.php

ok these injectors on the left are the oem p11 roller rocker ones.

How many cc are these? The list says gray injectors top out at 226 whp but it says thats for VE motors.

http://www.g20.net/gallery/data/3060/87DayFour27.jpg

ok these injectors on the left are the oem p11 roller rocker ones.

How many cc are these? The list says gray injectors top out at 226 whp but it says thats for VE motors.

http://www.g20.net/gallery/data/3060/87DayFour27.jpg

RR injectors are 259cc

Dear all,

Now I am running SR18 but rebored to 2000cc using SR20VE's pistons. Engine head is ported n polished, using TOMEI cams with 260lift.

What size of injectors should I use ?

thanks :)

What exactly is needed to install MSD injectors into a roller rocker fuel rail? Will a SAFCII be able to control the 50 lb ones?

need to know what size are a set of injectors i have. they are from a subaru non-turbo engine and the color of them is grey. i have googled it and have came up empty. i am planning another ga build for my b12. i know they arent the same size as the red ones because the red ones that come on the impreza non turbo are 280 and are red. i got them off a old wagon like a 93 to 98. not sure if it 2.2 or 2.5.

Just curious if anybody has tried it or not but I have the blue, top feed 39lb EV6 injectors out of a supercharged 03-04 cobra. I have these for my mustang but havent used them yet. We were thinking about trying them along with a JGY top feed fuel rail on my little bros turbo b13. He is currently running 370,s and it leans out hard and fast when it picks up the boost.

hey guys do you have the part number for the oem subaru sti yellow side feed injectors?

Does anyone have specs on 550 rc i am running a t28 and not sure at what bar to send out my jwt to get tune for

top feeds dont like anything but 3 bar

thanks