if i wana ever do it , i wana know what ones i should buy , 1800cc or 550, i realy would like some 550's for secondarys and keep the pramiry , will i need to retune ecu?,and i know how to put em in , just sorta snaps in realy after ya get fuel rail off and spill the enitre contents of gas tank on your brand new shirt! just wana know what might be involved , im gona try a challenge , making an auto rx7 that will dust a stock na 5spd rx7 , my rx7 is a 1990 gxl , i think 4 port auto

 

What injectors you will need is dependant on what type of modifciations your car is going to have. As your car is now, there is no point to upgrade the injectors. I don't even think they make 1800cc injectors for RX-7's. The highest I know of is 1600cc and you won't be needing those unless you are putting a BFT (big f**king turbo) and aiming for 450J+ rwhp. You might need an ecu upgrade, once again, this is determined by what mods you have, and also by what injectors you need.

Do a search for modifications you can do to your NA RX-7. After you decide on modifications you want to do to your engine, then you will know what injectors you will need to use. You might or might not need an ecu upgrade even... just depends how much power you want to make (reliably).

It's not THAT hard to make an NA AT FC beat an NA MT FC. Just bolt on a few mods (intake and exhaust system) and you should be able to do it. Nothing else necessary.

 

Like people have said before, all NA FCs are 6 port 13B engines. Yours is included. You will probably never need larger injectors unless you get a good port job and/or a supercharger and/or N20.

 

im gettin an air box and exhaust

 

then you don't need injectors for your N/A..

 

A TII doesn't even need injectors with that more than likely.

 

A S-AFC should keep you tamed. Not bigger Injectors.

 

how did you decide that you either need 550's or 1800's thats kinda a big difference dont you think?

 

I didn't even know they made 1800's that were readily available to someone who can't even spell...

 

Giving this kid an S-AFC is a really bad idea...Now we will have unending S-AFC questions until he pops his engine...

To the original poster:

1. Learn to think before you type, and formulate your idea instead of just puking it out on the keyboard

2. SEARCH. Every question that can be asked has.

3. You don't need to upgrade injectors on an NA unless you do some SERIOUS engine work.

 

The problem is, with alot of people they think that fuel injectors are a power mod. They don't realize its a safety mod.