Im starting my project car now here is what im doing for the next few months

Perminentaly opening Aux Ports


Free Flowing Intake

RB Header and Presilencer

Apexi GT Catback

Street Port

SAFC

Port Throttle Body

i was told to go with 550 cc secondary injectors but what if i go with 720cc

 

Assuming you're NA... Send off your 460's to get cleaned if you do anything.

The stock 460's provide plenty of fuel in a naturally aspirated setup.

 

if you are gonan wire teh 6 ports open, instead take the sleeves out, and remove teh shafts from the lower manifold and block off teh holes that it would create. this will be good for some top end power, wiring them open will just take away the low end

 

if you went with 720s you'd have too much fuel and your car would run poorly. Then, in order to fix that, you'd use your SAFC to set the 720s to put out fuel like a 550, maybe less.

 

Stop taking EFI-related advice from whoever told you that. Simply adding more fuel does not increase power; never has, never will. You will in fact lose power due to excessively rich mixtures. Unless you're also adding a bridgeport and/or turbo to your list, leave the stock injectors alone.

 

wouldnt wanna run them at full duty cycle anyway would you?

 

The most efective way to run a SAFC is to run large injectors and pull them back, oposed to the needed injectors and bumping them up.

Who ever told you about the 550cc to 720cc might have been tinking this I dunno. I say ask someone who has SAFC exsperiance, with ported motors and so on, like Aaron Cake or SonicRat.

IMO the mods you listed are not anything major, or requiring alot more fuel from a allready right engin on normal duty cycle.

 

No reason to go with larger injectors unless you are actually leaning out. And it's doubtfull you will ever run out of fuel with that port configuration (though it HAS been done on occasion).

 

now what if i added Nitrous with these mods (hypathetically)

 

Then yes, you need more fuel.

 

If you use a wet nitrous kit (and you should) then the extra fuel is added through the nitrous nozzles, not the injectors. The injectors will be fine but the fuel pump might need an upgrade.

 

You'd blow the engine up, and then the bigger fuel injectors would've been a waste of money...


-Ted

 

im getting r/a apex seals and springs and i was wounderinf howmuch of a shot of nitrous could those take and would i have to replace my side seals

 

http://www.1300cc.com/howto/how2/NOS.htm

 

why the GT spec exhaust? the piping is huge and youd lose some of bottom end with piping that big with an NA motor, id stick w/ a 2.5 or around there

 

actually with that apexi gt exhaust there is a small improvement but i will be better when i get my rb header ans catreplacement pipe