bigtymer

i dont kno anything about fuel injectors yet... so plz be gentle :p. First of all how many injectors are there/can fit on my 1990 tII. Second of all, wat kind and size should i get? suggestions and reasons for ur suggestions would be great!

Dan H

Technically 4. You can put more but it requires modification and a standalone.

Stock size is 550cc. Size depends on how modified your car is. And you need something to control the fuel as well like a SAFC or standalone. But before you do any of that, get a new fuel pump. "I think" the stock injectors will support 240-250rwhp while something like 720cc X 4's should be decent for 300rwhp without hitting over 80% duty cycle.

silverrotor

iTrader: (1)

Just to add, your FI's are High Impedence (11-16 ohms) aswell.

bigtymer

k now wat are secondary injectors?

Here are my mods btw:

Ported wastegate
t3/t4 turbo
turbo back racing beat exhaust
k&n cone filter
racing beat F.C.D
Walbro 255 lhp
Apex`i S-AFC


ive been told injectors would be my next best bet... so ya do i need to buy 4 new injectors? im confused slightly :p

gergrx7

secondary injectors are additional injectors that turn on at 3800 rpm. they add adition fuel for your car. i think you should add injectors along with a safc to tune them to make sure you arent running lean.

Aaron Cake

iTrader: (1)

And some of the answers you received certainly can't help that confusion.

At this point, you're probably on the edge of being a little lean. I would suggest upgrading the secondary injectors to 680CC or 720CC. Since you already have the S-AFC, you can easily now lean those new injectors out (you will need a wideband A/F gauge to do this properly) a little to stop you from running rich up high. As you mod the car, you can richen it up as necessary.

bigtymer

so how many secondary injectors are there on my car? once again... kno nothing about fuel injectors. so are u suggesting that i upgrade secondary injectors and leave the other ones stock?

gergrx7

you have 2 primary injectors and 2 secondary injectors. 2 per rotor. most people with a modded car and stock turbo only upgrade secondaries, because most of there power is in upper rpm.

yes i would recommened upgrading the secondary injectors and leaving primaries stock.

bigtymer

wouldnt it be better if i upgraded primary and secondary injectors?

bigtymer

k ill upgrade secondarys then but i dont kno which company to choose! any suggestions?

gergrx7

most people use the greddy 720cc injectors for www.rx7store.net the are like 110 a piece. some other people who try to get biggere injectors a little cheap try to find some gsl-se injectors for a 84-85 1st gen gsl-se, they are only 680cc though.

jdonnell

iTrader: (1)

where would you buy stock injectors, excluding the dealer? I called RC Engr and they said they dont have stock type injectors

gergrx7

EBAY or from someone on the forum

bigtymer

if i get the greddy injectors do i need the injector holders too?