soardrft

iTrader: (8)

my question here after much research is. What is the max injector size anyone would use with a sAFC? So far my research has lead me to 680cc. but that was 2 post. if i decide to go 680cc will it be hard to tune? currently i have 550cc injectors with my single setup, but i want injectors that will support 500hp just incase i get the bug to upgrade my turbo.

i dont want to invest in a standalone as of yet. i wanted to go power fc but its discontinued. so i will sit and wait for the next apex standalone or stay happy with my piggyback.

Ali SC3

iTrader: (10)

550's should get you close with a good pump.
I wouldn't recommend running huge injectors on a piggy back for the simple fact that every time you increase the injector size you are lowering the airflow or Map signal, which will result in more and more aggressive timing (unless you have a nicer piggyback which tweaks timing).
so the real answer is as big as you can go before the timing causes detonation and your motor blows up. as for what magical number that is, you couldn't pay me to guess.

Mandrel

^^He is correct.

But you do have the option of running something like the AEM FI/C, at which point your 680cc injectors would be just fine. It would be your best bet.