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injector size?

3863 Views 20 Replies 5 Participants Last post by  accent2003gt, 
A
what is a good injector size for my LC2? its an Alpha II. i am going turbo hopefully this summer and i am gathering the parts now.
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R
for starters i'd look for something in the 475cc ballpark

what's our static fuel pressure again, 43psi? whatever it is, make sure the rating is at that fuel pressure.
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A
that sounds huge! the shark racin ones are only 290 cc
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R
right, dont buy the shark racing ones

[Edited by rbuecker on Mar 30, 2006 8:19 AM]
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G
what sort of turbo? is your fuel system returnless or return? my personal opinion would be that that suggestion is too high. that being said, i'm only running a t-25 turbo. several accent gents boost up idle fuel pressure to compensate. in my testing beta 247cc injectors would not support more than 8psi boost at stock fp. i've moved to 30lb injectors (310cc) and ran pig rich at 10psi. currently they're tuned out -24% via safc. stock fp, idles fine runs fine until about 8psi boost (comes on about 3k rpm) or rolling @ 5k rpm then a quick blip of the throttle. need to add fuel up there. i'm also looking to move away from the MAF sensor. i believe i'm maxing the 2.5" beta MAF out at 10psi.

in summary, need more details. :chinese:
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omgbossis21
Without more information we cant really recomend injector sizes.... Jason where did u get injectors, I need bigger. You are maxing out beta maf im sure, after logging mine maxes out @8psi with a t-15 turbo....
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A
i aint quite sure wat siz turbo yet, but i can get one of a first generation manual eclipse 4g63 pretty cheap and get a few other pretty cheap so... anyone have a clue on what size for these turbo's?
4g63 turbo
t25
t3/4
oh andi am not sure about the fue line if it will be returnless or not.. is there a benefit to retunr or no?
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G
Originally posted by omgbossis21
[body]
Without more information we cant really recomend injector sizes.... Jason where did u get injectors, I need bigger. You are maxing out beta maf im sure, after logging mine maxes out @8psi with a t-15 turbo....
[/body]
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after tearing my setup apart, i realize, not only was i maxing out my beta MAF, i had a tear in a coupler inbetween the turbo and MAF, so it was sucking in even more air! =O
hopefully tomorrow, everything will go back together. my waste gate has a bit of an issue w/ seating but i'm going to try to straighten that out with a dremel. wishi i had time to pick up a t-28 and have it rotated but this all has to be done tomorrow.

i splurged and bought brand new accel high impedance (14.4v) 30# (or 32# i don't remember) injectors. i'm questioning them though. in my search for 14psi i may want larger ones. keep an eye out in the fs column. ;] previous x3 turbo'd owners said they couldn't tune such large injectors but there were math issues there.

i'm in the market for an exhaust cut out and i have a 3bar map sensor that i'm looking to switch w/ this tibby MAF, i'm just going to have to do some logging and tuning first. because i'm (in theory) maxing out the MAF i would like to eliminate it as a restriction. hence the map sensor. i'll let you know how that turns out.

accent2003gt, daily driver, weekend warrior, or track terror? t-25 or the 14g (similar to the 4g63 turbo) are great daily driver and sort of stage 2 level. anything after that you're worrying about internal integrity or turbo lag. t3/t4 wouldn't be good for daily driver, well, in my opinion anyway. boost @ 4-5k rpm and a 6k rpm redline... no point? engine bay space limitations and the cost to custom fab of parts would also quickly sway your opinion as well. though i would like to see it happen and work well, i don't think it would be practical as a starter kit. i believe a t-28 or specially formulated HKS or Garrett turbo could provide you with excellent spool time and excellent boost level efficiency as well.
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A
hey thanks for the info, so you think a t28 would be good for a daily driver? i want a turbo to spool pretty quick like around the 3000 area. and form wat i read earlier, 8 psi seems to be ok for daily driving on stock internals. but this car is going to be a daily driver. it should be turbo after this summer because i will be able to work more because school will be done lol... thats wat ya get for just turning 17 last week lol... but anyway do you have a suggestion for intercooler piping size also along wiht injector size? and whats the benefit of a fuel line that returns over one that is retunless? any info will be great!
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G
spooling should be around 3k. make sure you've got a straight through exhaust, 2.5" at least. some will say backpressure is needed. this is true, but guess what the turbo is providing for your motor? ;] no point in having a restriction after another restriction.

i/c piping is debatable. 2.5" will cause slight more turbo lag but a lot of higher end power. 2" is quick spooling but you may want to switch at a later point in that never ending search for every last hp. i went half and half for a happy medium.

injector sizing... not sure, depends what you decide to do with the fuel system. i believe a returnless fuel system will require smaller injectors. can't make a suggestion for your setup but with my goals 310cc injectors may be sufficient. i'll let you know if i break anything or my gauges and logs tell me different. ;] :: knocks on wood ::

[Edited by X3Jason on Mar 30, 2006 10:13 PM]
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A
hey thanks for the info, a buddy of mine is making me a full legnth, mendrel bent, stainless steel exhaust for this project for free so i got the exhaust covered lol. where did you go for your injectors? also, wat are you using as a computer for this setup? oh yea, and like you were saying about the intercooler piping, do you think i could split the differance and get 2 and a quarter inch piping and get a lil more boost lag but also have a lil more top end than running two inch or wouldit just be easier to get 2and a half and be done wiht it? i can deal wiht a little turbo lag because i am usually lready driving around in the 3000 rpm level

[Edited by accent2003gt on Mar 31, 2006 1:36 PM]
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R
Originally posted by X3Jason
[body]
i've moved to 30lb injectors (310cc) and ran pig rich at 10psi. currently they're tuned out -24% via safc. stock fp, idles fine runs fine until about 8psi boost (comes on about 3k rpm) or rolling @ 5k rpm then a quick blip of the throttle. need to add fuel up there. i'm [/body]
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i know i'm running very lean with 290cc, and my brain doesnt believe that ~20 more cc would do the trick. the reason i gave such a high requirement of 475 before was because this guy might want to boost really high later.

i know we can get 290cc from sharkracing/kspec
psc has some 330 and even 600 something

but where are 440s sold? speedfactor's store doesnt seem to be up at the moment. is rc engineering a good place?
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A
so where can i get these 310cc injectors? i aint looking to raise my boost past like 10 psi. its just gonna be a fairly quick car for the street. maybe a few years down the road will upgrade to even bigger injectors
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R
hey 290 might be ok, i keep learning something new every day. but not sure yet.. i only recommend larger because i dont want to have injectors being my limitation in the future, and would hate to limit you too. in fact, if you end up with the emanage ultimate, you can just as well get 1000cc injectors! okay back down to earth robert.

to answer your question, psc has some 330cc injectors for sale now :)
http://www.performancestylingcentre.com.au/turbo/fuel%20injectors.htm

if you've never worked with psc before, it's a bit different than i'm used to. you submit an order, then wait for them to email you back to complete the order. it's not bad really, and Bretton is a great person to work with!
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A
so now u think the 290cc injectors will be ok? the 330cc ones are really expensive for only 40 more cc and like twice the price of shark racing. now that i am still talking about the fue system... i win no doubt need a larger pump so i dont starve my injectors out of fuel. are there any cheap alteranitves for a high flow pump? like off a mustang or something?
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G
sorry, gonna do a quick reply as i'm at work. got Accel High Impedance injectors. either 30lb injectors or 32lb injectors. (yellow tops, accel trademark) i bought 4 single injectors. total cost was about $160 from SummitRacing.com

for the X3's (95-99 accents) Walbro 255 fuel pump for a 95-99 mitsu eclipse on ebay = $100 make sure you use the stock filter otherwise your fuel gauge will only read full to 3/8 because the float sensor will hit the provided filter. ThaSilva may have an idea on what to do for an LC or LC2.
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A
are these the rihgt injectors? it doesnt say if they are high impedance or not, but its says they are 14.4 ohms. is that the same thing?
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R
Originally posted by accent2003gt
[body]
are these the rihgt injectors? it doesnt say if they are high impedance or not, but its says they are 14.4 ohms. is that the same thing?


[/body]
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yep, 14 ohms = high impedence
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A
ok cool thank you.
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H
well I just psted something about 457 injectors but since you are talking about that size injectors ill re tell it. stock srt4 injectors fit right in with slight modification of the electric clip. other than that I cant imagine a better fit. and I believe they are rated at 457cc. I have a hyundai accent 2001 so I dont know how many other hyundai these injectors will fit but with so many srt4 owners swiching to stage 1 wich replaces the stock injectors you could find them for fairly cheap probably on ebay, shoot I got mine for free.
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