bencb44

iTrader: (2)

I don't really know much about injectors and how to fit them up to different performance levels so I figured I'd ask everyone here.

I'm currently rebuilding my engine and have heard that I will need bigger injectors. Here are the mods that I will have when it's finished:

Pettit Sreetport with 3mm apex seals
BNR Stage 3 turbos (staying sequential)
APEXi power fc
APEXi fmic
HKS dual intake
3"dp
3" Pettit mp
3" Racing Beat catback
Unorthodox underdrive pulleys
Koyo rad.
Rotary Extreme's 25 row dual oil coolers
Bonez Street-Comp clutch
ACT streetlite flywheel
Supra fuel pump

That's everything I can think of for right now. Am I missing anything that I should have?
Thanks for the help.

littlemilla3

iTrader: (1)

the kind that spray fuel?

I would use either 550/1600 or 850/1300 just so you won't have to worry about having enough fuel in the future. You could probably get by with 550/1300 but they will be running a high duty cycle.

MakoRacing

iTrader: (12)

850/1300's should be fine

rynberg

Well, first of all, it depends on how much boost you are going to be running. Unless you are going to be running over 15 psi of boost, boring out the secondaries to 1300cc will be plenty of fuel, and will require no modifications to the fuel rails. You will need a higher flowing fuel pump.

bencb44

iTrader: (2)

ok so 550/1300 should be fine? what about the pump, I need a bigger one than the supra pump? would I have to do anything to put 850's in the primary rail incase I choose to go 850/1300?

bleung

Shouldn't the Supra pump flow enough for his setup and enough to support 850/1300 injectors?

maxcooper

Play with the numbers here:
http://maxcooper.com/rx7/how-to/fuel_system/calcs.html

Read the comments and check out the links in the right column to find out more about fuel systems, and choose good values for each input (though I have tried to provide helpful defaults already).

-Max

Snook

iTrader: (12)

I had the toughest choice deciding on what injectors to get. and had 1200s, 1300s, and 1600s all sitting in my room.
I then decided on 850s and 1600s just to be safe
this is pretty much the deal on the types of injectors you can get

the problem with 1600s is that its a lot of work to install and make brakets and route new lines. new rail, fpr etc...

the problem with 1200s or 1300s is that some people say they are unrelaible and it just wasnt worth the risk for me to blow up the engine

some people say with 850s the car doesnt idle as well but mine was fine

also, youll make more hp with smaller injectors as the fuel will atomize better.

if you have ~365rwhp max and decide to get just 1300s you should be ok.

and one supra fuel pump should be enough...I had to use 2 though but I was running very high boost. good luck

Rx7aholic

iTrader: (22)

HEY SURGE MONSTER ARE U PLANNING TO SELL YOUE 1300CC? Damn sorry about the cap, but I also want your attention? pm with an offer, I looking for some 1300, khris