fuelling question

[r34 gtr]

to run 15-18psi on a garrett gt-28r with a .60 A/R on the compressor and a .64 on the turbine side, what size fuel injectors do you guys think i need? im having trouble finding some good 550cc ish injectors and was wondering if i could get away with some 450cc ones. im guessing not. im trying to make this cheap because a bank error has left me a little short, and some unexpected expenses have left me even shorter...

- tim

[Nismo1182]

Having to buy a new motor will leave you even poorer. Buy 550's or bigger.

[r34 gtr]

i figured as much. im already doing the new motor thing, thats why im poor.

- tim

[r34 gtr]

hey, how big would the injectors need to be in lb/hr? and does anyone know the conversion? thanks,

- tim

[r34 gtr]

ok, nevermind. im an idiot.

[r34 gtr]

ok, last time i swear to god! i know different size injectors have different colors. i tried searching but could not get a good answer. what colors are what size? i know blue = 450, purple = 550, etc. but what size is dark green and everything else for that matter?! im in a real hurry, if you cant tell.

- tim

[float_6969]

It's not that easy time. it depends on brand also. I've got 550cc NISMO injectors (made by bosch I assume) and the plugs are pink. You'll have to do it on a cc or lb/hr basis. Don't try to do it by color.

[r34 gtr]

i know. i was just wondering what flow these cosworth injectors i found were. they had a dark green top and were supposed to be good for 330+bhp with a chip and some other stuff in a sierra cosworth. anyway, im having a really hard time finding injectors in the size i need for anything less than an arm and a leg. what ive found is that the cheapest price i can get for injectors is some bosch 160lb/hr slugs at $42 each. im just afraid they would be really overkill. im looking for something in the 600-750cc or 80-95lb/hr range and am not coming up with much.

- tim

[NeedCAforS13]

Get some rx7 injectors... they have both 550 and 720cc sizes on ebay:)

Sean

[boost_boy]

Question Tim,

What are you going to control the injectors with; and don't tell me a super AFC! Super AFC possibly can somewhat help, but I don't trust those little black boxes with my engines (Just me). Anything over 500cc and you'll need more than a super AFC or an emanage and JWT don't exceed 72 lb/hr and I don't think they've done a program for a CA18DET ecu (at least to my immediate knowledge).

Dee

[boost_boy]

1600cc injectors are worthless on a ca18! Anyone who tries them will have a nastily idle rpm just to keep the engine running. The biggest we can use sanely is 1000cc and even that's pushing it as it will support in excess of 700hp on a 110 CID or an 1809cc engine.

Dee

[r34 gtr]

yeah. i know. im just annoyed with the rediculous prices of these things. yes, i am going to use that safcII to tune it, haha. i dont trust it either which is why im going to sacrifice power out the yin-yang for safety's sake. i did a really rough calculation of injector sizing and i came up with needing between 72 and 94lb/hr or 550-720cc. i didnt know the density of gasoline though, so i had to make a best guess using the density of water. i like the look of some of those 680cc injectors on ebay, though i'd rather not spend $320 if i can avoid it. im running the SWAT ecu and ill see what it can really do in awhile, ill just make the finer ajustments with the SAFCII.

- tim

[r34 gtr]

also, does anyone know the part number of the rx-7 turbo injectors (both the 550 and 720cc part numbers would be great). and is there any difference in impedance between the s4 and s5 models? thanks!!

- tim

[gani]

s4 is low impendance and s5 is high impendance

[r34 gtr]

ok, cool. so thats pre-87 i guess? or something close. 88-91 is the s5 i think? anyway, if someone has the part numbers for the s4 injectors i would love them forever.

- tim

[NeedCAforS13]

84-85 13B NT low square center 680cc orange 195500-090086-87 13B NT low square center 460cc red 195500-135086-87 13B T low square center 550cc tan 195500-1370

dr bo0: 86-87 13B T low square center 550cc tan 195500-1370 <(=-=-turbo versiondr bo0: 86-87 13B NT low square center 460cc red 195500-1350 <(=-=- non turbo84-85 13B NT low square center 680cc orange 195500-0900 <(=-=-jdm version i thinkdr bo0: 86-87 13B NT low square center 460cc red 195500-1350 <(=-=-thats what i am usingdr bo0: the part numbers will be on the side of the injectors on the plastic side

from a conversation with cuzan0 a LOOOONG time ago:) hopefully thats what you're looking for...

Sean

[r34 gtr]

yeah, thats it. thanks man! (now is when i go whore it up and buy some rebuilt ones for 30 bucks each). my car may run yet!

- tim