tscompusa

iTrader: (31)

Choosing the correct injectors for your application based on power level and fuel type

Id like to help others choose the right size injectors for their applications.

I will post some data in here. for now just ask in here and i will respond when i can.

Popular injector brands for the Evo 1-9 include but are not limited to:

FIC
PTE
MAPerformance
Injector Dynamics
Bosch
DW

BDecker9

iTrader: (2)

PTE 680cc
3" TBE
Spoolinup COP
Muse O2 Dump
Intake/LICP/UICP
TurboXS FMIC
TurboXS MBC
Old school FP Green
Stock FPR
93 Octane
Walbro 255
Goal is 350whp

My question is, will 680's be high on the duty cycle? Causing my pump to fail premature? Or should I just go with 750's/850's?

silverevo05

iTrader: (7)

Oh this is awesome

330 - 350 whp Evo IX

CA 91 octane...no e85
Aem intake
Tanabe 2.75 downpipe
rre 3 inchexhaust
Spoolin up COP
GM 3 port
ETS V2 LICP

would like to eventually get stock MAP ported exhaust manifold, ets 3 inch intercooler...Done

Do i need a fuel pump on a 9?

Which injectors (I will not look for more HP than stated above) will give me the best driveablility, reliability, plug and play and no issues (i.e. cold, warm start, bucking etc) I was thinking RC but let me know


Thanks Awesome idea BTW

tscompusa

iTrader: (31)

no high duty cycle wont kill your pumps, but if you have dirty fuel socks or something of that nature you can stress the pumps by increasing their work duty. I killed a walbro 255 that way before. once they start screaming loud you know either the pumps clogging or they are about to take a dump.

backpressure isnt efficient for the fuel system, but wont necessarily hurt it. however the goal is to reduce it as much as possible.

an injector running all out 100% duty cycle could go static, and thats the last thing you want to occur. once that happens the injector is no longer able to control the fuel flow properly which can cause major engine damage.

rule of thumb is keep the duty cycle about 80% and dont increase it by much if at all possible. however on evoscan 90% is ok. evoscan reads approx 20% higher then it really is doing in reality from my experience. 90% is still leaving a 10% blanket.

680cc pte with your combo at 350WHP (i might add thats very conservative if dynojet numbers), you will be fine. I dont know off the top of my head what IDC that will be, but i will guess its somewhere in the neighborhood of 40% @ 350whp on 93.

Honestly i would go with 1000's or something around that size, because you wont be paying to much extra for the additional injector, plus then you wont have to worry about it in the future. but yes 750/850 will be good for estimate 500whp~ on 93.

tscompusa

iTrader: (31)

I would replace it for a walbro 255 part # gss342 yes. it will flow more and is a direct stock replacement part.

350whp dynojet or mustang? i would go with a FIC 950cc because its so close to the price of the smaller cc injectors. you're talking $20 more getting you 200cc more.

My favorite small injector fic makes currently to date is the 1100CC high-z injectors. i really like those. now those are a bit pricier though.

no problem.

drewbird91

iTrader: (7)

Power Goals ~350 awhp (Dyno Jet 424XLC)
Evo 8.5 turbo
93 octane only
walbro 255 pump
Buschur ported intake manifold, ported ex manifold, Buschur/ebay o2 housing, 3" exhaust, UICP, LICP, ported TB, intake, Buschur street FMIC, gsc s2 cams

Looking to put a lot of these parts on at the same time and get it tuned. I have everything above, except for injectors. Thinking FIC injectors.


Thanks.

Sil'vr-Boi6

iTrader: (26)

Goal: 380whp MD 430whp MD .....Tom tuned of course
05' Evo 95K miles
FIC 950 Will 950cc be enough??
93
Bolt-on: Megan 3"exhaust, testpipe, DV LICP, UICP, 4" IC Megan O2 housing, Billet 20g
AC Delco 3 port
BR ported intake
Double pumper
*Will not use Dump

car_nut15

iTrader: (8)

Power goal - 500whp Dyno jet

Built 2.0
FP black JB
walbro 255
FPR
Skunk 2 composite fuel rail
+ pretty much all the bolt ons.

What size injectors would you reccomend I go with for pump gas 94 oct and do you think my power goal is reasonable??

tscompusa

iTrader: (31)

680cc on 93octane with your mods should be ok. 350whp is a pretty conservative goal for that mod list also!

tscompusa

iTrader: (31)

Ya id recommend FIC. i sell every brand injector, but i really try to push FIC because FIC's customer service is by far the best!

FIC's best mid range performing injectors to date i would say is the 1100CC high-z injector set.

An 850cc would not be bad option if you want to keep cost down though

Under 350whp on a dynojet the stock injectors can handle though easily.

tscompusa

iTrader: (31)

Ya 950cc should be enough on 93octane. that's roughly 485whp dynojet. If thats a standard 20G turbo though 485whp dynojet isn't gonna happen on 93. I'll extract whatever is possible though.

tscompusa

iTrader: (31)

Modify the walbro 255 and it will handle the power much easier.
While you're in there replace the fuel sock part # 125-147. its about
a $15 shipped i believe i get them for.

on 94oct, id go with the 1100CC fic high-z. contact me for pricing.

If you have everything ported, nice big cams, and nothing is left unmodded then it is possible to touch 500 on 94. If you have a high comp 2.0L that helps a lot.

key power makers are: o2 dump, big cams, very ported out intake mani, 3 port & mbc (both), good FMIC, etc. on 94oct, the FMIC is very important.

don't forget speed density with a big 4" sd intake also. that alone will net another 12-15whp by itself. then when you really go to crank the boost the gains keep going up
and up. the more boost you run, the more additional power you will free up.

thepoint4life23

iTrader: (3)

How much power can the 1100CC high-z injectors make on a single walbro and e85?
Im looking for some injecters soon. dont want to keep buying injecter. but dont want to go 2000cc right now?

Fast_Freddie

iTrader: (50)

The fic 1100s should be good for around 500 on E85 and a single modified wally...

2004EvoVIII

iTrader: (10)

380whp Mustang is my goal - '04 Evo

Will have the following:

- GSC S1 cams
- CXRacing FMIC w/piping
- Perrin Intake
- Grimmspeed MBC
- 3" turbo back
- PnP'ed stock ex. mani
- PnC'ed stock VIII 9.8 turbo
- Walbro 255
- 91-93 pump gas (mostly 93)

I was thinking PTE 1000cc? Those seem to be very common, I just want to make sure they will be enough. Honestly I just want 350whp Mustang, anything more and it'll be extra goodness.